This document discusses bacterial concrete as a self-remediating material where microorganisms like Bacillus pasteurii are added to concrete to continuously precipitate calcite to fill cracks. The process is called Microbiologically Induced Calcium Carbonate Precipitation (MICCP). Several studies on MICCP and bacterial concrete are referenced from 2001-2009. The methodology involves casting concrete beams, inducing cracks, injecting bacteria, curing in different media, and testing compressive strength over time. Bacillus pasteurii is used to precipitate calcite to repair cracks through bacterial action and improve strength.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Cracks in concrete are inevitable and are one of the inherent weaknesses of concrete. Water and other salts seep through these cracks, corrosion initiates, and thus reduces the life of concrete. So there was a need to develop an inherent biomaterial, a self - repairing material which can remediate the cracks and fissures in concrete. Bacterial concrete is a material, which can successfully remediate cracks in concrete. This technique is highly desirable because the mineral precipitation induced as a result of microbial activities is pollution free and natural. As the cell wall of bacteria is anionic, metal accumulation (calcite) on the surface of the wall is substantial, thus the entire cell becomes crystalline and they eventually plug the pores and cracks in concrete. This paper discusses the plugging of artificially cracked cement mortar using Bacillus Pasteurii bacteria combined with sand as a filling material in artificially made cuts in cement mortar which was cured in urea and Calcium chloride medium. The effect on the compressive strength and stiffness of the cement mortar cubes due to the mixing of bacteria is also discussed in this paper. It was found that use of bacteria improves the stiffness and compressive strength of concrete. Scanning electron microscope (SEM) is used to document the role of bacteria in microbiologically induced mineral precipitation. Rod like impressions were found on the face of calcite crystals indicating the presence of bacteria in those places.
In this study, bacterial concrete is to be prepared under grade of concrete OPC 43.The design mix proportioning also carried under IS code provision. Testing of specimens are carried at 7 days ,14 days and 28 days of curing by Compression Testing Machine and Universal Testing Machine for corresponding specimens. The Compressive Strength and Flexural Strength of Bacterial Concrete are found.
INVESTIGATION ON MECHANICAL PROPERTIES OF BACTERIAL CONCRETE WITH FLYASH PART...Ijripublishers Ijri
For making it economical, a part of the cement by weight is replaced with a material called ‘fly ash’ which is cheaper in
cost and abundantly available. On the other hand the cracks in concrete lead to leakage problems and there is a need
to address these problems for future.
In the above context, the objective of the present investigation is to obtain the performance of the concrete by adding
microbiologically induced special growth/filler and part of cement replaced by fly ash. One such thought leads to the
development of very special concrete known as bacterial concrete where bacteria is induced in the concrete and part
of the cement replaced by fly ash. A technique is adopted in the formation of concrete by utilizing microbiologically
induced calcite (CaCo3) precipitation. Microbiologically induced calcite precipitation (MICP) is a technique that comes
under a broader category of science called Bio-Mineralization. ‘Bacillus Subtilis’, a common soil bacterium can induce
the precipitation of calcite.
AN EXPERIMENTAL INVESTIGATION ON THE STRENGTH PROPERTIES OF FLY ASH BASED BAC...AM Publications
The present investigation deals with the influence of Bacillus Subtilis bacteria on strength properties of fly ash concrete. In fly ash concrete, cement was partially replaced with 10%, 20% and 30% with fly ash by weight and optimizes the percentage of fly ash for making bacterial concrete. The bacteria Bacillus Subtilis of different cell concentrations 103, 105 and 107 cells/ml were used for making bacterial concrete. The experimental investigations were carried out for 28 and 56 days. Tests conducted include Compressive strength, Split tensile strength, Flexural strength and Ultrasonic Pulse Velocity. In fly ash concrete, maximum strength properties observed for 10% replacement of cement with fly ash and the percentage of fly ash is fixed as 10% for making bacterial concrete. In bacterial concrete, maximum strength properties obtained for the bacteria cell concentration of 105cells/ml. The improvement in the strength properties of fly ash concrete is due to the precipitation of calcium carbonate (CaCO3) in the micro environment by the bacteria Bacillus Subtilis.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
Cracks in concrete are inevitable and are one of the inherent weaknesses of concrete. Water and other salts seep through these cracks, corrosion initiates, and thus reduces the life of concrete. So there was a need to develop an inherent biomaterial, a self - repairing material which can remediate the cracks and fissures in concrete. Bacterial concrete is a material, which can successfully remediate cracks in concrete. This technique is highly desirable because the mineral precipitation induced as a result of microbial activities is pollution free and natural. As the cell wall of bacteria is anionic, metal accumulation (calcite) on the surface of the wall is substantial, thus the entire cell becomes crystalline and they eventually plug the pores and cracks in concrete. This paper discusses the plugging of artificially cracked cement mortar using Bacillus Pasteurii bacteria combined with sand as a filling material in artificially made cuts in cement mortar which was cured in urea and Calcium chloride medium. The effect on the compressive strength and stiffness of the cement mortar cubes due to the mixing of bacteria is also discussed in this paper. It was found that use of bacteria improves the stiffness and compressive strength of concrete. Scanning electron microscope (SEM) is used to document the role of bacteria in microbiologically induced mineral precipitation. Rod like impressions were found on the face of calcite crystals indicating the presence of bacteria in those places.
In this study, bacterial concrete is to be prepared under grade of concrete OPC 43.The design mix proportioning also carried under IS code provision. Testing of specimens are carried at 7 days ,14 days and 28 days of curing by Compression Testing Machine and Universal Testing Machine for corresponding specimens. The Compressive Strength and Flexural Strength of Bacterial Concrete are found.
INVESTIGATION ON MECHANICAL PROPERTIES OF BACTERIAL CONCRETE WITH FLYASH PART...Ijripublishers Ijri
For making it economical, a part of the cement by weight is replaced with a material called ‘fly ash’ which is cheaper in
cost and abundantly available. On the other hand the cracks in concrete lead to leakage problems and there is a need
to address these problems for future.
In the above context, the objective of the present investigation is to obtain the performance of the concrete by adding
microbiologically induced special growth/filler and part of cement replaced by fly ash. One such thought leads to the
development of very special concrete known as bacterial concrete where bacteria is induced in the concrete and part
of the cement replaced by fly ash. A technique is adopted in the formation of concrete by utilizing microbiologically
induced calcite (CaCo3) precipitation. Microbiologically induced calcite precipitation (MICP) is a technique that comes
under a broader category of science called Bio-Mineralization. ‘Bacillus Subtilis’, a common soil bacterium can induce
the precipitation of calcite.
AN EXPERIMENTAL INVESTIGATION ON THE STRENGTH PROPERTIES OF FLY ASH BASED BAC...AM Publications
The present investigation deals with the influence of Bacillus Subtilis bacteria on strength properties of fly ash concrete. In fly ash concrete, cement was partially replaced with 10%, 20% and 30% with fly ash by weight and optimizes the percentage of fly ash for making bacterial concrete. The bacteria Bacillus Subtilis of different cell concentrations 103, 105 and 107 cells/ml were used for making bacterial concrete. The experimental investigations were carried out for 28 and 56 days. Tests conducted include Compressive strength, Split tensile strength, Flexural strength and Ultrasonic Pulse Velocity. In fly ash concrete, maximum strength properties observed for 10% replacement of cement with fly ash and the percentage of fly ash is fixed as 10% for making bacterial concrete. In bacterial concrete, maximum strength properties obtained for the bacteria cell concentration of 105cells/ml. The improvement in the strength properties of fly ash concrete is due to the precipitation of calcium carbonate (CaCO3) in the micro environment by the bacteria Bacillus Subtilis.
AN EXPERIMENTAL STUDY ON STRENGTH AND FRACTURE PROPERTIES OF SELF HEALING CON...IAEME Publication
Cracking in concrete is irresistible when the load applied is more than its limit and the treatment of cracks is very expensive. This phenomenon also affects the reinforcement in the structure by means of carbon dioxide and water through the cracks. One of the ways to arrest this cracking phenomenon is mixing of bacteria into the concrete. In the present study, an attempt is made to arrest the cracks in concrete using bacteria and calcium lactate. The percentages of bacteria selected for the study are 3.5% and 5% by weight of cement. In addition, calcium lactate was used at 5% and 10% replacement of cement by weight. Bacteria produce calcium carbonate crystals which blocks the micro cracks and pores in the concrete after reacting with calcium lactate.
Formation of cracks in concrete is a common phenomenon that allows many chemicals, water to seep inside leading to decrease in durability, including progressive drop in concrete strength. The maintenance and repair of structural concrete is very complex phenomenon. Self-healing concrete, using bacteria at the time of mixing, is an impressive solution to overcome these kinds of adverse effects. It is an economical way is to prepare concrete of better quality. The study was carried out to investigate the concrete performance by adding bacteria “Bacillus subtilis”. This Self-Healing concrete is also known as as Bio-concrete. Bacteria was induced directly in the concrete mix along with calcium lactate i.e., an organic precursor producing calcium carbonate crystals that block cracks and pores in the concrete. Samples were made with different quantities of bacteria and results showed significant increase in compressive strength of concrete and decrease in permeability. The concrete micro-structure was observed under SEM which also confirmed the experimental results obtained.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
BACTERIAL CONCRETE - A SOLUTION TO CRACK FORMATIONAM Publications
Concrete is a homogenous mixture and cracks in concrete are inevitable so there is a need for repair which affects the economic life of any structure. To overcome this problem an inherent biomaterial is developed, a self-repairing material which can remediate the cracks in concrete. Bacterial concrete is a technique which is highly desirable because the calcium precipitation is induced as a result of microbial activities. This helps in increasing the strength and durability of concrete. As per the results, it is clearly observed that there is increase in compressive strength, tensile strength and durability in bacterial concrete as compared with normal concrete. This is the main objective of the bacterial concrete for which it was introduced. Various tests which are carried out to study these properties of concrete are compressive strength test, Split tensile test. Scanning Electron Microscope (S.E.M) is used to study the growth of bacteria in the concrete. It is observed that for bacterial proportion 105 cells (24 ml of bacteria in 1000ml), there is significant increase in compressive strength of the bacterial concrete i.e. around 25% increase in strength as compared with normal concrete. For this purpose bacteria used is Bacillus Subtilis.
AN EXPERIMENTAL STUDY ON STRENGTH AND FRACTURE PROPERTIES OF SELF HEALING CON...IAEME Publication
Cracking in concrete is irresistible when the load applied is more than its limit and the treatment of cracks is very expensive. This phenomenon also affects the reinforcement in the structure by means of carbon dioxide and water through the cracks. One of the ways to arrest this cracking phenomenon is mixing of bacteria into the concrete. In the present study, an attempt is made to arrest the cracks in concrete using bacteria and calcium lactate. The percentages of bacteria selected for the study are 3.5% and 5% by weight of cement. In addition, calcium lactate was used at 5% and 10% replacement of cement by weight. Bacteria produce calcium carbonate crystals which blocks the micro cracks and pores in the concrete after reacting with calcium lactate.
Formation of cracks in concrete is a common phenomenon that allows many chemicals, water to seep inside leading to decrease in durability, including progressive drop in concrete strength. The maintenance and repair of structural concrete is very complex phenomenon. Self-healing concrete, using bacteria at the time of mixing, is an impressive solution to overcome these kinds of adverse effects. It is an economical way is to prepare concrete of better quality. The study was carried out to investigate the concrete performance by adding bacteria “Bacillus subtilis”. This Self-Healing concrete is also known as as Bio-concrete. Bacteria was induced directly in the concrete mix along with calcium lactate i.e., an organic precursor producing calcium carbonate crystals that block cracks and pores in the concrete. Samples were made with different quantities of bacteria and results showed significant increase in compressive strength of concrete and decrease in permeability. The concrete micro-structure was observed under SEM which also confirmed the experimental results obtained.
IJRET : International Journal of Research in Engineering and Technology is an international peer reviewed, online journal published by eSAT Publishing House for the enhancement of research in various disciplines of Engineering and Technology. The aim and scope of the journal is to provide an academic medium and an important reference for the advancement and dissemination of research results that support high-level learning, teaching and research in the fields of Engineering and Technology. We bring together Scientists, Academician, Field Engineers, Scholars and Students of related fields of Engineering and Technology
BACTERIAL CONCRETE - A SOLUTION TO CRACK FORMATIONAM Publications
Concrete is a homogenous mixture and cracks in concrete are inevitable so there is a need for repair which affects the economic life of any structure. To overcome this problem an inherent biomaterial is developed, a self-repairing material which can remediate the cracks in concrete. Bacterial concrete is a technique which is highly desirable because the calcium precipitation is induced as a result of microbial activities. This helps in increasing the strength and durability of concrete. As per the results, it is clearly observed that there is increase in compressive strength, tensile strength and durability in bacterial concrete as compared with normal concrete. This is the main objective of the bacterial concrete for which it was introduced. Various tests which are carried out to study these properties of concrete are compressive strength test, Split tensile test. Scanning Electron Microscope (S.E.M) is used to study the growth of bacteria in the concrete. It is observed that for bacterial proportion 105 cells (24 ml of bacteria in 1000ml), there is significant increase in compressive strength of the bacterial concrete i.e. around 25% increase in strength as compared with normal concrete. For this purpose bacteria used is Bacillus Subtilis.
Since Christmas is approaching & Santa is on high fever..here I thought to share some interesting thoughts and facts about SANTA...All about Santa and Brand, learn a few things from the generous, joyous, white-bearded man, wearing a red coat with white collar and cuffs, white-cuffed red trousers, leather belt and boots who carries a bag full of gifts for children.
Merry Christmas…
A study on effect of bacteria on cement compositeseSAT Journals
Abstract
Crack is commonly observed failure in the case of concrete. Crack may develop due to addition of excess of water to during mixing of
concrete, or may be due to shrinkage and creep. In the present study, crack healing and improvement of physical properties of cement
paste, mortar and concrete are studied. It is done by the addition of bacterial strains namely Bacillus Sphaericus and Sporosarcina
Pastuerii. It is found that these bacteria when added at 106 concentration of cells/ml of water to cement composites increased by about
39.8% and 33.07% in paste. There is an increment of 50% and 28.2% in mortar for two bacterial strains. The strength increment is
found to be 18.3% and 12.2% for Bacillus Sphaericus and Sporosarcina Pastuerii respectively for concrete. Ultrasonic pulse velocity
of the bacterial concrete was in line with conventional concrete. SEM and XRD images revealed presence of CaCO3 produced
microbially. There is overall improvement in the bacterial composites compared to conventional composites.
Keywords: Bacillus Sphaericus, Sporosarcina Pastuerii Bacteria, Crack, Concentration, and Calcite.
A study on effect of bacteria on cement compositeseSAT Journals
Abstract
Crack is commonly observed failure in the case of concrete. Crack may develop due to addition of excess of water to during mixing of
concrete, or may be due to shrinkage and creep. In the present study, crack healing and improvement of physical properties of cement
paste, mortar and concrete are studied. It is done by the addition of bacterial strains namely Bacillus Sphaericus and Sporosarcina
Pastuerii. It is found that these bacteria when added at 106 concentration of cells/ml of water to cement composites increased by about
39.8% and 33.07% in paste. There is an increment of 50% and 28.2% in mortar for two bacterial strains. The strength increment is
found to be 18.3% and 12.2% for Bacillus Sphaericus and Sporosarcina Pastuerii respectively for concrete. Ultrasonic pulse velocity
of the bacterial concrete was in line with conventional concrete. SEM and XRD images revealed presence of CaCO3 produced
microbially. There is overall improvement in the bacterial composites compared to conventional composites.
Keywords: Bacillus Sphaericus, Sporosarcina Pastuerii Bacteria, Crack, Concentration, and Calcite.
Self healing of cracks or self-filling of cracks by the help of bacterial process after hardening is known as self healing concrete, It is also known as bacterial concrete. Bacterial concrete refers to a new generation concrete in which selective cementation by microbiologically-induced CaCO3 precipitation has been introduced for remediation of micro-cracks. Self-repairing of cracks without any external aide.
Significant increase in compressive strength and flexural strength when compared to normal concrete.
Resistance towards freeze-thaw attacks.
Reduction in permeability of concrete.
Reduces the corrosion of steel due to the cracks formation and improves the durability of steel reinforced concrete.
Bacillus bacteria are harmless to human life and hence it can be used effectively.
The usage of cement has been increased
throughout the world which has severe effect on the
environment. replacement of cement in concrete is in very
much need, for which several materials came into existence
like flyash, silicafume GGBS and geopolymers etc.one such
material which will act as cementinious materials is used in
the study which will reduce cracks and fissures in concrete
by utilizing microbiologically induced calcite (CaCo3
)
precipitation called Bio Mineralization produced by Bacillus
subtilis in the presence of chemicals. In this project,
bacterial concrete is prepared under grade of concrete M25
and Natural fiber is added in total volume of concrete in
desired level which will cure the cracks automatically by
forming calcium carbonate precipitate as well as to achieve
more Compressive strength and Flexural strength. To avoid
corrosion, the bacterial concrete along with natural fibers is
used which results in self healing process.
In this study, the behavior of bacterial fibre
concrete was investigated experimentally. Various
parameters like compressive strength, flexural strength and
splitting tensile strength of specimens for bacterial fibres
concrete have been studied. Then these values for bacterial
and bacterial fibre concrete are compared with the
conventional concrete.
The objective of the present investigation is to obtain the influence of facultative bacteria (Bacillus Cereus) on the strength of concrete made with and without bacteria. Three different cell concentrations (102,107, 1010 cells/ml) of bacteria are used in making the concrete mixes. In making concrete, one control specimen is prepared and three more mixes are also prepared by voluntarily replacing of 10, 20 and 30 litres of bacterial nutrient medium with water. Split Tensile strength test is performed at the age of 7, 14 and 28 days. Test results indicate that inclusion of Bacillus Cereus in concrete enhances the compressive strength. Maximum 25.64% increase in compressive strength is observed with 107 cells/ml of bacteria. The improvement in strength takes place due to microbiologically induced calcite precipitation (MICP). MICP is a layer of highly impermeable calcite deposition on the surface of already existing concrete layer. The effect of MICP is quantified by X-Ray Diffraction (XRD) analysis and visualized by Scanning Electron Microscopy (SEM).
Falcon stands out as a top-tier P2P Invoice Discounting platform in India, bridging esteemed blue-chip companies and eager investors. Our goal is to transform the investment landscape in India by establishing a comprehensive destination for borrowers and investors with diverse profiles and needs, all while minimizing risk. What sets Falcon apart is the elimination of intermediaries such as commercial banks and depository institutions, allowing investors to enjoy higher yields.
Discover the innovative and creative projects that highlight my journey throu...dylandmeas
Discover the innovative and creative projects that highlight my journey through Full Sail University. Below, you’ll find a collection of my work showcasing my skills and expertise in digital marketing, event planning, and media production.
Improving profitability for small businessBen Wann
In this comprehensive presentation, we will explore strategies and practical tips for enhancing profitability in small businesses. Tailored to meet the unique challenges faced by small enterprises, this session covers various aspects that directly impact the bottom line. Attendees will learn how to optimize operational efficiency, manage expenses, and increase revenue through innovative marketing and customer engagement techniques.
Cracking the Workplace Discipline Code Main.pptxWorkforce Group
Cultivating and maintaining discipline within teams is a critical differentiator for successful organisations.
Forward-thinking leaders and business managers understand the impact that discipline has on organisational success. A disciplined workforce operates with clarity, focus, and a shared understanding of expectations, ultimately driving better results, optimising productivity, and facilitating seamless collaboration.
Although discipline is not a one-size-fits-all approach, it can help create a work environment that encourages personal growth and accountability rather than solely relying on punitive measures.
In this deck, you will learn the significance of workplace discipline for organisational success. You’ll also learn
• Four (4) workplace discipline methods you should consider
• The best and most practical approach to implementing workplace discipline.
• Three (3) key tips to maintain a disciplined workplace.
LA HUG - Video Testimonials with Chynna Morgan - June 2024Lital Barkan
Have you ever heard that user-generated content or video testimonials can take your brand to the next level? We will explore how you can effectively use video testimonials to leverage and boost your sales, content strategy, and increase your CRM data.🤯
We will dig deeper into:
1. How to capture video testimonials that convert from your audience 🎥
2. How to leverage your testimonials to boost your sales 💲
3. How you can capture more CRM data to understand your audience better through video testimonials. 📊
[Note: This is a partial preview. To download this presentation, visit:
https://www.oeconsulting.com.sg/training-presentations]
Sustainability has become an increasingly critical topic as the world recognizes the need to protect our planet and its resources for future generations. Sustainability means meeting our current needs without compromising the ability of future generations to meet theirs. It involves long-term planning and consideration of the consequences of our actions. The goal is to create strategies that ensure the long-term viability of People, Planet, and Profit.
Leading companies such as Nike, Toyota, and Siemens are prioritizing sustainable innovation in their business models, setting an example for others to follow. In this Sustainability training presentation, you will learn key concepts, principles, and practices of sustainability applicable across industries. This training aims to create awareness and educate employees, senior executives, consultants, and other key stakeholders, including investors, policymakers, and supply chain partners, on the importance and implementation of sustainability.
LEARNING OBJECTIVES
1. Develop a comprehensive understanding of the fundamental principles and concepts that form the foundation of sustainability within corporate environments.
2. Explore the sustainability implementation model, focusing on effective measures and reporting strategies to track and communicate sustainability efforts.
3. Identify and define best practices and critical success factors essential for achieving sustainability goals within organizations.
CONTENTS
1. Introduction and Key Concepts of Sustainability
2. Principles and Practices of Sustainability
3. Measures and Reporting in Sustainability
4. Sustainability Implementation & Best Practices
To download the complete presentation, visit: https://www.oeconsulting.com.sg/training-presentations
Unveiling the Secrets How Does Generative AI Work.pdfSam H
At its core, generative artificial intelligence relies on the concept of generative models, which serve as engines that churn out entirely new data resembling their training data. It is like a sculptor who has studied so many forms found in nature and then uses this knowledge to create sculptures from his imagination that have never been seen before anywhere else. If taken to cyberspace, gans work almost the same way.
VAT Registration Outlined In UAE: Benefits and Requirementsuae taxgpt
Vat Registration is a legal obligation for businesses meeting the threshold requirement, helping companies avoid fines and ramifications. Contact now!
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Attending a job Interview for B1 and B2 Englsih learnersErika906060
It is a sample of an interview for a business english class for pre-intermediate and intermediate english students with emphasis on the speking ability.
Attending a job Interview for B1 and B2 Englsih learners
Balaji
1. Under the guidance of,
Dr. P.C SABUMON
PRESENTED BY,
BALAJI..N
(13MST1028)
2. Cracks in concrete are inevitable and are one of the inherent
weaknesses of concrete. Water and other salts seep through
these cracks, corrosion initiates, and thus reduces the life of
concrete.
Remediation of already existing cracks has been the subject of
research for many years.
The various products such as structural epoxy, resins, epoxy
mortar and other synthetic mixtures are used as a filling agents
for repairing concrete, but these are neither environment
friendly nor safe.
3. The materials that are capable of controllable response to
the environment are called smart materials.
A dumb material can be made smart by combining them
with microorganisms.
In the study microorganism added are, Bacillus pasteurii,
common soil bacteria. Since the cracks are remediated by
the microorganisms the process is called the
microbiologically-enhanced crack remediation (MECR)
process.
4. To repair minor/micro cracks of concrete by bacterial action.
Cast specimen and test for load to crack and treat with bacterial
biomass and study the repairing action.
5. SL NO NAME OF AUTHOR YEAR RESEARCH WORK
1)
2)
3)
4)
Ramakrishnan et al
Barabesi et al
Day J L et al
Muynck et al
2001
2007
2003
2008
microbiologically induced calcite (CaCO3)
precipitation. (MICP) is reported by the
research group
he has studied calcite formation by
Bacillus subtilis, in order to identify genes
involved in the biomineralization process.
This paper describes the results of an
innovative approach in concrete crack
remediation utilizing microbiologically
induced calcite .
Shortcomings of conventional surface
treatments have drawn the attention to
alternative techniques for the
improvement of the durability of concrete.
6. SL NO NAME OF AUTHOR YEAR RESEARCH WORK
1)
2)
3)
4)
Leuschner et al
Marvasi et al
Patil et al
Nagaraj et al
2001
2009
2008
2004
Research was conducted to examine the
effects of dehydration and rehydration on
radioactive phosphorous and carbon
molecular mobility in dormant Bacillus
subtilis spores.
They have chosen Bacillus subtilis 168 as
their model to study which physiological
aspects are associated with calcium
carbonate (calcite) formation during
biofilm development when grown on
precipitation medium.
Efficiency of Microbiologically Enhanced
Crack Remediation was evaluated by
comparing the compressive strength
check in involvement. of Bacillus pasteurii
in calcite precipitation.
He says that for proportioning concrete
mixes water cement ratio becomes a
dominant factor, when the strength of
concrete is lesser than that of aggregate
7. • Bacterial concrete is a self-remediating biomaterial, in
which microorganisms, Bacillus pasteruii, a common soil
bacterium, are added which can continuously precipitate
calcite, which fills the cracks.
• The phenomenon of calcite precipitation is called
Microbiologically Induced Calcium Carbonate
Precipitation (MICCP).
• Actually bacterial concrete is not a concrete. Bacteria are
just introduced either on the hardened concrete or into the
concrete before placing.
9. METHODOLOGY
Review of literature
Study of bacterial concrete
Comparison of crack before and after
injecting bacteria using NDT
Application of load induce
hair pin crack find crack
width using NDT
Preparing the reinforced
concrete beams
Bacterial injection to beam in
medium and curing
Result
10. MATERIALS AND METHODS
Ordinary Portland cement of 53 Grade.
Size of beam available in our lab 100*100*500.
BACTERIAL SOURCES
Microorganisms Bacillus pasteurii and Bacillus sphaericus
were obtained pure bacterial culture was isolated named as
isolate 1 from curing tank at Civil Engineering PG Research
lab, M S Ramaiah Institute of Technology Bangalore.
11. Using the compression testing machine, care should be taken
for inducing very minor crack like hair pin crack.
Crack width has to be determined using NDT.
Medium of Bacterial Concrete
•Three different mediums were selected for test.
•Water
•Phosphate-buffer solution
•Urea-CaCl2
12. The beam specimens after de-molding are immersed in
triplicates in respective bacterial solution grown overnight
separately for 24hrs. After 24hrs the beam are wiped with
a blotting paper to remove any surface bacteria and cured
in corresponding calcite precipitation media (Calcium
source 49gm/Lt + Urea 20g/Lt) at room temperature
(Figure) until compression testing at the intervals of 7, 14
and 28 days. Media were replaced at a regular interval of 7
days. Control samples need to be prepared in similar
manner and cured in water. Compression testing is
performed in compression testing machine.
13. Dr .sookie bang in 2007
Dr.v. ramakrishnan in 2007