This document provides an overview of self-compacting concrete (SCC), including its advantages over conventional concrete, mix design principles, constituent materials, fresh and hardened properties, applications, and references for further information. SCC is able to flow and consolidate under its own weight without vibration, allowing easier placement in complex forms. Its benefits include faster construction, reduced labor, improved safety and aesthetics. Proper mix design and materials selection are needed to achieve adequate filling and passing abilities without segregation. SCC has been used successfully in large projects like bridges and tall buildings.
Impact and Performance of Linen Fiber Reinforced Concrete in Slender ColumnsAJSERJournal
This study was consisted of two phases, revealed the behavior of Self-Compacting Concrete (SCC)
specimens of small-diameter slender column to achieve high quality concrete properties without using concrete
vibrator. The first phase investigated the effect of linen fiber on the rheological properties of SCC using two mixes types:
type I mix: without lime powder, and type II mix: with 20% lime as a replacement of cement content. The linen fiber was
contented of 0, 2, and 4 Kg/m³. In the second phase, the type II mix was used to cast three columns; one with plain SCC
and the other two with 2 and 4 Kg/m³ fiber contents. These columns were cured and cut in a certain manner to obtain 7
cylinders 150 × 300 mm and 8 slices 20 mm thickness. The cylinders were used to measure the distribution of unit
weight, compressive strength, and ultrasonic pulse velocity (UPV) along the column height. The rheological properties
of SCC were reduced with the additives of fibers to the mix constituents, but the properties of Fiber reinforced SelfCompacted Concrete (FSCC) were tested at 4 Kg/m³ fiber content. The distribution of unit weight, compressive strength,
and UPV provided good compaction of concrete. Also, the distribution of coarse aggregate at bottom, middle and top
sections of columns were uniformly distributed.
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.
Self-compacting concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. The highly fluid nature of SCC makes it suitable for placing in difficult conditions and in sections with congested reinforcement. Use of SCC can also help minimize hearing-related damages on the worksite that are induced by vibration of concrete. Another advantage of SCC is that the time required to place large sections is considerably reduced.
Impact and Performance of Linen Fiber Reinforced Concrete in Slender ColumnsAJSERJournal
This study was consisted of two phases, revealed the behavior of Self-Compacting Concrete (SCC)
specimens of small-diameter slender column to achieve high quality concrete properties without using concrete
vibrator. The first phase investigated the effect of linen fiber on the rheological properties of SCC using two mixes types:
type I mix: without lime powder, and type II mix: with 20% lime as a replacement of cement content. The linen fiber was
contented of 0, 2, and 4 Kg/m³. In the second phase, the type II mix was used to cast three columns; one with plain SCC
and the other two with 2 and 4 Kg/m³ fiber contents. These columns were cured and cut in a certain manner to obtain 7
cylinders 150 × 300 mm and 8 slices 20 mm thickness. The cylinders were used to measure the distribution of unit
weight, compressive strength, and ultrasonic pulse velocity (UPV) along the column height. The rheological properties
of SCC were reduced with the additives of fibers to the mix constituents, but the properties of Fiber reinforced SelfCompacted Concrete (FSCC) were tested at 4 Kg/m³ fiber content. The distribution of unit weight, compressive strength,
and UPV provided good compaction of concrete. Also, the distribution of coarse aggregate at bottom, middle and top
sections of columns were uniformly distributed.
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.
Self-compacting concrete (SCC) is a flowing concrete mixture that is able to consolidate under its own weight. The highly fluid nature of SCC makes it suitable for placing in difficult conditions and in sections with congested reinforcement. Use of SCC can also help minimize hearing-related damages on the worksite that are induced by vibration of concrete. Another advantage of SCC is that the time required to place large sections is considerably reduced.
ASSESSMENT OF SELF COMPACTING CONCRETE IMMERSED IN ACIDIC SOLUTIONS WITH PART...Ijripublishers Ijri
The present investigations are proposed to study the acid resistance behavior of M40 grade SCC with partial replacement
of cement with mineral admixture Fly Ash at 10, 20, and 30%. Rational method of mix design was adopted for mix
design of M40 grade SCC for the trial mixes in the absence of BIS code for SCC mix design. Experimental investigations
were carried out to study the acid resistance of SCC from hydrochloric acid (HCl) and sulphuric acid (H2So4) which are
effective acids expected to cause damage for strength and durability of structures, by observing the effect for 14, 28 and
60days strengths and performance at different percentages of mix with flyash. Based on these studies, inference was
drawn for durability of structures exposed to such aggressive environment.
Study of Mechanical Properties in SCC by Blending Cement Partially With Fly A...IJSRD
The development of self-compacting concrete has been one of the most important materials in the modern building industry. The purpose of this concrete concept is to decrease the risk due to human factor. The use of SCC is spreading worldwide because of its very attractive properties. In the present investigation Blended SCC is the one in which some percentage of cement content used for the concrete is replaced by any of the mineral admixtures. Here, the present study to development of blended self-compacting concrete by replaced in the mineral admixtures using Fly ash 0-30% and metakaolin 0-30% as the weight of cement. Study the rheological properties and mechanical properties of developed blended SCC mixes in the laboratory condition and different curing ages. In recent years, many researchers have established that the use of supplementary cementatious materials (SCMs) like blast furnace slag, silica fume, metakaolin (MK), fly ash (FA) and rice husk ash (RHA) etc. can, not only improve the various properties of concrete both in its fresh and hardened states, but also can contribute to economy in construction costsruning.
You could be a professional graphic designer and still make mistakes. There is always the possibility of human error. On the other hand if you’re not a designer, the chances of making some common graphic design mistakes are even higher. Because you don’t know what you don’t know. That’s where this blog comes in. To make your job easier and help you create better designs, we have put together a list of common graphic design mistakes that you need to avoid.
More Related Content
Similar to ON-EFFECT-OF-SIZE-OF-AGGREGATE-ON-SELF-COMPACTING-CONCRETE-PPT.pptx
ASSESSMENT OF SELF COMPACTING CONCRETE IMMERSED IN ACIDIC SOLUTIONS WITH PART...Ijripublishers Ijri
The present investigations are proposed to study the acid resistance behavior of M40 grade SCC with partial replacement
of cement with mineral admixture Fly Ash at 10, 20, and 30%. Rational method of mix design was adopted for mix
design of M40 grade SCC for the trial mixes in the absence of BIS code for SCC mix design. Experimental investigations
were carried out to study the acid resistance of SCC from hydrochloric acid (HCl) and sulphuric acid (H2So4) which are
effective acids expected to cause damage for strength and durability of structures, by observing the effect for 14, 28 and
60days strengths and performance at different percentages of mix with flyash. Based on these studies, inference was
drawn for durability of structures exposed to such aggressive environment.
Study of Mechanical Properties in SCC by Blending Cement Partially With Fly A...IJSRD
The development of self-compacting concrete has been one of the most important materials in the modern building industry. The purpose of this concrete concept is to decrease the risk due to human factor. The use of SCC is spreading worldwide because of its very attractive properties. In the present investigation Blended SCC is the one in which some percentage of cement content used for the concrete is replaced by any of the mineral admixtures. Here, the present study to development of blended self-compacting concrete by replaced in the mineral admixtures using Fly ash 0-30% and metakaolin 0-30% as the weight of cement. Study the rheological properties and mechanical properties of developed blended SCC mixes in the laboratory condition and different curing ages. In recent years, many researchers have established that the use of supplementary cementatious materials (SCMs) like blast furnace slag, silica fume, metakaolin (MK), fly ash (FA) and rice husk ash (RHA) etc. can, not only improve the various properties of concrete both in its fresh and hardened states, but also can contribute to economy in construction costsruning.
You could be a professional graphic designer and still make mistakes. There is always the possibility of human error. On the other hand if you’re not a designer, the chances of making some common graphic design mistakes are even higher. Because you don’t know what you don’t know. That’s where this blog comes in. To make your job easier and help you create better designs, we have put together a list of common graphic design mistakes that you need to avoid.
Book Formatting: Quality Control Checks for DesignersConfidence Ago
This presentation was made to help designers who work in publishing houses or format books for printing ensure quality.
Quality control is vital to every industry. This is why every department in a company need create a method they use in ensuring quality. This, perhaps, will not only improve the quality of products and bring errors to the barest minimum, but take it to a near perfect finish.
It is beyond a moot point that a good book will somewhat be judged by its cover, but the content of the book remains king. No matter how beautiful the cover, if the quality of writing or presentation is off, that will be a reason for readers not to come back to the book or recommend it.
So, this presentation points designers to some important things that may be missed by an editor that they could eventually discover and call the attention of the editor.
Can AI do good? at 'offtheCanvas' India HCI preludeAlan Dix
Invited talk at 'offtheCanvas' IndiaHCI prelude, 29th June 2024.
https://www.alandix.com/academic/talks/offtheCanvas-IndiaHCI2024/
The world is being changed fundamentally by AI and we are constantly faced with newspaper headlines about its harmful effects. However, there is also the potential to both ameliorate theses harms and use the new abilities of AI to transform society for the good. Can you make the difference?
Top 5 Indian Style Modular Kitchen DesignsFinzo Kitchens
Get the perfect modular kitchen in Gurgaon at Finzo! We offer high-quality, custom-designed kitchens at the best prices. Wardrobes and home & office furniture are also available. Free consultation! Best Quality Luxury Modular kitchen in Gurgaon available at best price. All types of Modular Kitchens are available U Shaped Modular kitchens, L Shaped Modular Kitchen, G Shaped Modular Kitchens, Inline Modular Kitchens and Italian Modular Kitchen.
Transforming Brand Perception and Boosting Profitabilityaaryangarg12
In today's digital era, the dynamics of brand perception, consumer behavior, and profitability have been profoundly reshaped by the synergy of branding, social media, and website design. This research paper investigates the transformative power of these elements in influencing how individuals perceive brands and products and how this transformation can be harnessed to drive sales and profitability for businesses.
Through an exploration of brand psychology and consumer behavior, this study sheds light on the intricate ways in which effective branding strategies, strategic social media engagement, and user-centric website design contribute to altering consumers' perceptions. We delve into the principles that underlie successful brand transformations, examining how visual identity, messaging, and storytelling can captivate and resonate with target audiences.
Methodologically, this research employs a comprehensive approach, combining qualitative and quantitative analyses. Real-world case studies illustrate the impact of branding, social media campaigns, and website redesigns on consumer perception, sales figures, and profitability. We assess the various metrics, including brand awareness, customer engagement, conversion rates, and revenue growth, to measure the effectiveness of these strategies.
The results underscore the pivotal role of cohesive branding, social media influence, and website usability in shaping positive brand perceptions, influencing consumer decisions, and ultimately bolstering sales and profitability. This paper provides actionable insights and strategic recommendations for businesses seeking to leverage branding, social media, and website design as potent tools to enhance their market position and financial success.
White wonder, Work developed by Eva TschoppMansi Shah
White Wonder by Eva Tschopp
A tale about our culture around the use of fertilizers and pesticides visiting small farms around Ahmedabad in Matar and Shilaj.
Expert Accessory Dwelling Unit (ADU) Drafting ServicesResDraft
Whether you’re looking to create a guest house, a rental unit, or a private retreat, our experienced team will design a space that complements your existing home and maximizes your investment. We provide personalized, comprehensive expert accessory dwelling unit (ADU)drafting solutions tailored to your needs, ensuring a seamless process from concept to completion.
3. Introduction
Fresh concrete that can flow around reinforcement and consolidate within
formwork under its own weight that exhibits no defects due to segregation or
bleeding.
The guiding principle for this type of concrete is that the sedimentation velocity of
a particle is inversely proportional to the viscosity of the floating medium in which
the particle exists.
Source: https://wwwbuildipedia.com
4. Problems with Conventional Concrete
Requirement of skilled worker for compaction in conventional concrete
Difficult to use mechanical compaction for
Underwater concreting
Cast in-situ pile foundation
Columns with congested reinforcement
5. Benefits of SCC
Faster construction
Reduction in site manpower
Safer working environment
Improved aesthetics
Easier placing
Improved durability
7. Mix design principles
The flowability and viscosity of the paste is adjusted by proportioning the cement
and additives water to powder ratio and then by adding super plasticizers and VMA
.
The paste is the vehicle for the transport of the aggregate, therefore the volume of
the paste must be greater than the void volume in the aggregate.
In order to control temperature rise and thermal shrinkage cracking as well as
strength, the fine powder should be added to keep the cement content at an
acceptable level. e.g. fly ash, mineral filler, silica fume etc.
8. Contd.
SCC should have
Low coarse aggregate content
Increased paste content
Low water powder ratio
Increased super plasticizer dosage
Viscosity modifying agents
9. Flow Chart for achieving self compactibility
Reduction of
water to binder
ratio
Limitation of
coarse
aggregate
content &
maximum size
Addition of
mineral
admixture
Usage of Super
plasticizer &
VMA
High segregation
resistance of mortar &
concrete
High Deformability of
mortar & concrete
Self compactibility
10. Typical mix proportion values
Constituent Typical range by volume(liter/m3)
Powder 160-240
Water 150-210
Coarse aggregate 270-360
water to powder ratio 0.80-1.10
Fine aggregate 48-55% of total aggregate weight
11. Materials Selection
Limits on the amount of marginally unsuitable aggregate.
Choice of HRWR
Choice of VMA
Interaction & compatibility between cement, HRWR, VMA
12. Aggregate
It is observed from these studies that self-compactability is achievable at lower
cement (or fines) content when rounded aggregates are used, as compared to
angular aggregates.
Rounded aggregates would provide a better flowability and less blocking potential
for a given water-to-powder ratio, compared to angular and semi-rounded
aggregates.
To eliminate the poor gradation problem in aggregates, filler materials are used.
13. Chemical Admixtures
HRWRA helps in achieving excellent flow at low water contents and VMA reduces
bleeding and improves the stability of the concrete mixture.
HRWRAs that work on the principle of steric hindrance require a lower dosage
compared to those based on electrostatic repulsion.
Acrylic copolymers (AC) and polycarboxylate ethers (PCE) are effective at lower
dosages compared to sulfonated condensates of melamine (SMF) or naphthalene
(SNF) formaldehyde.
14. Mineral Admixture
Fly ash: It reduces free drying shrinkage and restrains the shrinkage cracking
width.
Silica fume: it gives good cohesion, improved resistance to segregation. Silica
fume is also very effective in reducing or eliminating bleeding.
Mineral fillers: The particle size distribution shape and water absorption of
mineral fillers may affect the water demand or sensitivity. CaCO3 based minerals
fillers (<0.125mm size) are widely used and can give excellent rheological
properties and performance.
15. Fresh Properties of SCC
Filling Ability
Slump flow test, T50 cm slump flow test, V-Funnel test
Passing ability
J-ring test, U-box, L-box
Segregation potential
Settlement column Test, Sieve stability test, Penetration test
16. Slump Flow Test
It is done to access the horizontal flow of concrete in the absence of obstruction.
It gives good assessment of filling ability.
Slump cone of 300 mm height, 100 mm upper diameter and 200 mm bottom
diameter.
The diameter of spread should be lie between 650 mm to 800 mm.
The higher the flow value, greater its ability to fill formwork .
18. J-Ring Test
It determines the passing ability of SCC.
It consist of ring of reinforcement bars that will fit around the slump cone.
Slump cone is fitted with concrete and lifted up as in slump cone test.
The acceptable difference in height between inside and outside should be between
0 and 10 mm.
20. Curing
Top surface dry quickly because of the increased quantity of paste, the low
water/fines ratio and the lack of bleed water at the surface.
To avoid this Initial curing should therefore commence as soon as practicable after
placing and finishing in order to minimize the risk of surface crusting and
shrinkage cracks caused by early age moisture evaporation.
21. Complexities involved in SCC
Higher paste volume results in greater shrinkage and creep.
Higher strength achievement leads to reduces the workability to unacceptable level
Lateral Formwork pressure
Limit of flow distance of the concrete
22. Application
Two anchorages of Akashi-Kaikyo (Straits) Bridge, Japan. The volume of the cast
concrete in the two anchorages amounted to 290,000 m3
The highest use of SCC in India was done at Delhi metro project. About 10000 m3
of SCC has been Used.
At Kaiga nuclear power plant, SCC of Characteristic strength 30 MPa was used.
23. Contd.
The Burj Khalifa is the tallest building in the world. SCC was used throughout the
building and was pumped 166 stories above the ground.
The Trump Tower in Chicago, Illinois was a major user of SCC. It is a 92-story
reinforced concrete project that required 3500 m3of SCC to be cast-in-place
continuously for 22 hours to construct the mat foundation that supports the
finished structure. The mix had a 7-day compressive strength of 68 MPa and a 28-
day strength of 82 MPa . This single pour is the largest ever recorded to date in
North America using SCC
24. Conclusion
We can reduce the in-place cost and maker a safer working environment for the
workers.
SCC can be effectively placed in most congested areas and also where normal
methods of vibration are not possible.
Further research are required to interpret influence on the hardened properties of
SCC more precisely.
The cost of SCC is 10-15 % higher than the conventional concrete.
25. References
1. Okamura et al. “Self-compacting concrete,” Journal of Advanced Concrete
Technology, vol. 1, no. 1, pp. 5–15,2003
2. SK Singh “Self Compacting Concrete - A Paradigm Shift”, Journal of New Building
Materials & Construction World, Vol. 15, No. 3, pp 164-180,September , 2009.
3. The European Guidelines for Self Compacting Concrete, May 2005
4. Eric P. Koehler et al. Aggregate in Self Consolidating Concrete, ICAR Project 108,
March 2007
5. KHALEEL, O.R. et al. The Effect of Coarse Aggregate on Fresh and Hardened
Properties of Self-Compacting Concrete (SCC), Elsevier, pp 805-813, 2011
26. Contd.
1. Filho et al. Hardened properties of self-compacting concrete — A statistical
approach, Elsevier, Construction and Building Materials, pp 1608-1615, 2010
2. Schindler, K Anton et al. Properties of self-consolidating concrete for precast
members, ACI Materials Journal, V. 104, No. 1, 2007
3. Specification and Guidelines for Self-Compacting Concrete, EFNARC, 2002
4. Ouchi et al. APPLICATIONS OF SELF-COMPACTING CONCRETE IN JAPAN, EUROPE
AND THE UNITED STATES, ISHPC, 2003
5. R. Loser, A. Leemann, Shrinkage and restrained shrinkage cracking of self-
compacting concrete compared to conventionally vibrated concrete, Materials and
Structures, 2008