Cement concrete mix design involves determining the proportions of cement, water, fine aggregate, and coarse aggregate to produce concrete with specified properties like strength, workability, and durability at lowest cost. The key factors influencing mix design include the required compressive strength, type and grade of cement, maximum size of coarse aggregates, grading of aggregates, water-cement ratio, workability, and durability. The water-cement ratio is especially important as it affects the strength, permeability, and workability of the hardened concrete.
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Properties of Fresh and Hardened ConcreteRishabh Lala
Properties of Fresh (Workability)
Hardened Concrete (Workability,Permiablitiy,Durablility)
Thermal properties
Micro-cracking of concrete
Mix Design
Rheology
Causes of Damage of Concrete
Quality Control in Concrete and Durability factors : An overviewbybyRAJESH PRASAD,IRSE, CPM/M, RVNL. KOLKATA. An interesting and informative presentation....
Properties of Fresh and Hardened ConcreteRishabh Lala
Properties of Fresh (Workability)
Hardened Concrete (Workability,Permiablitiy,Durablility)
Thermal properties
Micro-cracking of concrete
Mix Design
Rheology
Causes of Damage of Concrete
what is polymer concrete, types, properties, material used in manufacturing process , manufacturing process, applications and their advantages. case study on polymer composite concrete.
Vacuum concrete is the type of concrete in which the excess water is removed for improving concrete strength.
The water is removed by use of vacuum mats connected to a vacuum pump.
The main aim of this technique is to extract extra water from concrete surface using vacuum dewatering.
Here, I attach a PowerPoint presentation created by me for a competition held by UltraTech. Have a look at this and feel free to share your views with me.
This presentation contains IS Concrete mix design method and Basics of Design mix of concrete.It conveys; Objectives of Mix Design ;Grades of Concrete; Nominal Mix and Design Mix; Factors affecting Choice of Mix Design; Methods of Concrete Mix Design; IS Method Of Design.
THIS PRESENTATION IS MAINLY OCCUPIED IN CE 6002 CONCRETE TECHNOLOGY UNIT NO.03......
-------FOR CIVIL ENGINEERING STUDENTS IN 2013 REGULATION =-------------------------
what is polymer concrete, types, properties, material used in manufacturing process , manufacturing process, applications and their advantages. case study on polymer composite concrete.
Vacuum concrete is the type of concrete in which the excess water is removed for improving concrete strength.
The water is removed by use of vacuum mats connected to a vacuum pump.
The main aim of this technique is to extract extra water from concrete surface using vacuum dewatering.
Here, I attach a PowerPoint presentation created by me for a competition held by UltraTech. Have a look at this and feel free to share your views with me.
This presentation contains IS Concrete mix design method and Basics of Design mix of concrete.It conveys; Objectives of Mix Design ;Grades of Concrete; Nominal Mix and Design Mix; Factors affecting Choice of Mix Design; Methods of Concrete Mix Design; IS Method Of Design.
THIS PRESENTATION IS MAINLY OCCUPIED IN CE 6002 CONCRETE TECHNOLOGY UNIT NO.03......
-------FOR CIVIL ENGINEERING STUDENTS IN 2013 REGULATION =-------------------------
Concrete is a mixture of cement, aggregates and water, with any other admixture which may be added to modify the placing and curing processes or the ultimate physical properties.
1. What is Mix design.
2. Understand the different types of mix.
3. Design the mix proportion as per IS Method.
4. Design the mix proportion as per ACI Method.
Experimental Investigation of High – Strength Characteristics of Self Curing ...IJMTST Journal
In concrete structures exposed to the ambient air at early ages, the moisture content in concrete
decreases due to moisture diffusion. In addition, self-desiccation due to hydration of cement causes an
additional decrease of moisture content in concrete at early ages, especially for high-strength concrete. In this
study, the internal relative humidity in drying concrete specimens was measured at early ages. Furthermore,
the variation of relative humidity due to self-desiccation in sealed specimen was measured. The moisture
distribution in low-strength concrete with high water/cement ratio was mostly influenced by moisture
diffusion due to drying rather than self-desiccation. In high-strength concrete with low water/cement ratio,
however, self-desiccation had a considerable influence on moisture distribution. The results obtained from
the moisture diffusion theory were in good agreement with experimental results.
Strength And Workability Characteristics Of Super Plasticized Concrete.AshishVivekSukh
The aim of this project is to study the workability and strength characteristics of superplasticized concrete. The investigation is carried out using workability test, compressive strength test, split tensile test and modulus of elasticity test.
The process of selecting suitable ingredients of concrete and determining their relative amounts with the objective of producing a concrete of the required, strength, durability, and workability as economically as possible, is termed the concrete mix design.
This is a presentation by Dada Robert in a Your Skill Boost masterclass organised by the Excellence Foundation for South Sudan (EFSS) on Saturday, the 25th and Sunday, the 26th of May 2024.
He discussed the concept of quality improvement, emphasizing its applicability to various aspects of life, including personal, project, and program improvements. He defined quality as doing the right thing at the right time in the right way to achieve the best possible results and discussed the concept of the "gap" between what we know and what we do, and how this gap represents the areas we need to improve. He explained the scientific approach to quality improvement, which involves systematic performance analysis, testing and learning, and implementing change ideas. He also highlighted the importance of client focus and a team approach to quality improvement.
The Art Pastor's Guide to Sabbath | Steve ThomasonSteve Thomason
What is the purpose of the Sabbath Law in the Torah. It is interesting to compare how the context of the law shifts from Exodus to Deuteronomy. Who gets to rest, and why?
Operation “Blue Star” is the only event in the history of Independent India where the state went into war with its own people. Even after about 40 years it is not clear if it was culmination of states anger over people of the region, a political game of power or start of dictatorial chapter in the democratic setup.
The people of Punjab felt alienated from main stream due to denial of their just demands during a long democratic struggle since independence. As it happen all over the word, it led to militant struggle with great loss of lives of military, police and civilian personnel. Killing of Indira Gandhi and massacre of innocent Sikhs in Delhi and other India cities was also associated with this movement.
Synthetic Fiber Construction in lab .pptxPavel ( NSTU)
Synthetic fiber production is a fascinating and complex field that blends chemistry, engineering, and environmental science. By understanding these aspects, students can gain a comprehensive view of synthetic fiber production, its impact on society and the environment, and the potential for future innovations. Synthetic fibers play a crucial role in modern society, impacting various aspects of daily life, industry, and the environment. ynthetic fibers are integral to modern life, offering a range of benefits from cost-effectiveness and versatility to innovative applications and performance characteristics. While they pose environmental challenges, ongoing research and development aim to create more sustainable and eco-friendly alternatives. Understanding the importance of synthetic fibers helps in appreciating their role in the economy, industry, and daily life, while also emphasizing the need for sustainable practices and innovation.
We all have good and bad thoughts from time to time and situation to situation. We are bombarded daily with spiraling thoughts(both negative and positive) creating all-consuming feel , making us difficult to manage with associated suffering. Good thoughts are like our Mob Signal (Positive thought) amidst noise(negative thought) in the atmosphere. Negative thoughts like noise outweigh positive thoughts. These thoughts often create unwanted confusion, trouble, stress and frustration in our mind as well as chaos in our physical world. Negative thoughts are also known as “distorted thinking”.
Read| The latest issue of The Challenger is here! We are thrilled to announce that our school paper has qualified for the NATIONAL SCHOOLS PRESS CONFERENCE (NSPC) 2024. Thank you for your unwavering support and trust. Dive into the stories that made us stand out!
Unit 8 - Information and Communication Technology (Paper I).pdfThiyagu K
This slides describes the basic concepts of ICT, basics of Email, Emerging Technology and Digital Initiatives in Education. This presentations aligns with the UGC Paper I syllabus.
Ethnobotany and Ethnopharmacology:
Ethnobotany in herbal drug evaluation,
Impact of Ethnobotany in traditional medicine,
New development in herbals,
Bio-prospecting tools for drug discovery,
Role of Ethnopharmacology in drug evaluation,
Reverse Pharmacology.
2. Cement concrete mix design
Cement concrete mix design means, determination
of the proportion of the concrete ingredients
i.e. cement , water, fine aggregate, coarse
aggregate which would produce concrete
possessing specified properties such as
workability, strength and durability with
maximum overall economy.
3. Basic considerations
Design involves determination of the proportions
of the given constituents namely cement, water,
coarse and fine aggregates and admixtures
This would produce concrete possessing specified
properties both in the fresh and hardened states
with the maximum overall economy.
Workability is specified as the important property
of concrete in the fresh state
4. For
hardened state compressive strength and
durability are important.
Proportioning of the ingredients of concrete is an
important phase as it ensures the quality.
Design of plastic concrete of medium strength can
be based on following assumptions:
1) Compressive strength is governed by W/C ratio.
2) Workability of concrete is governed by water
content.
5. Factors influencing the choice
of mix design
Grade designation
Type and grade of cement
Maximum nominal size of coarse aggregates
Grading of combined aggregates
Water-cement ratio
Workability
Durability
Quality control
6. Grade designation
It gives characteristic compressive strength
requirements of the concrete.
It’s the major factor influencing mix design.
7. Type and grade of cement
Choice of type of cement depends upon the
requirements at hand.
For very high compressive strength portland
cement of grades 43 and 53 used.
Where early strength is required, rapid
hardening portland cement is used.
8. For mass construction low heat portland
cement is used.
Cement content in concrete varies inversely
with the strength of cement used in
preparation of concrete, i.e. higher the
strength lesser will be the cement content.
Fineness of cement increases workability by
reducing friction between aggregates.
9. Max nominal size of coarse aggregate
Its determined by sieve analysis.
Max nominal size of aggregate used is
governed by size of the section and the
spacing of the reinforcement.
For the concrete with higher W/C ratio, the
larger max size of aggregate is used
For high strength concrete, 10-20mm size.
10. Grading of combined aggregate
Grading is one of the important factor
affecting strength of concrete.
The aggregates can be combined by:
1.
2.
Analytical method
Graphical method
11. Water-to-Cement Ratio
The ratio of water-to-cement, or w/c, is the single
most important parameter with regards to concrete
quality
Theoretically, about 0.22 to 0.25 is required for
complete hydration
Practically, the useful limit is around 0.33
Reducing the water for a given amount of cement
will move the cement particles closer together,
which in turn densifies the hydrated cement paste.
This increases strength and reduces permeability
12.
It also makes the concrete more difficult to work
In combination, the w/c and degree of hydration
control many of the properties of the hardened
concrete
Steps to be followed in selecting the water cement
ratio:
i.
The strength of cement to be used is determined.
ii.
When cement strength data are available,
corresponding curve is chosen for the
determination of W/C.
13. Workability
The workability of concrete for satisfactory
placing and compaction is controlled by:
i.
Size and shape of section to be concreted
Quantity and spacing of reinforcement
Methods employed for transportation,
placing and compaction of concrete.
ii.
iii.
14. Durability
Durability of concrete is the resistance to
deteriorating influences which may reside inside
the concrete itself, or to the aggressive
environments.
Durability are achieved by restricting the minimum
water cement content and the maximum water
cement ratio and the type of cement.