scholarly journals Effect of fly ash on shrinkage of self-compacting concrete using restrained ring test

2019 ◽  
Vol 13 (3) ◽  
pp. 26-33
Author(s):  
Tran Van Mien ◽  
Nguyen Hoang Phuc ◽  
Cu Thi Hong Yen
Keyword(s):  
Fly Ash ◽  
Thermal Power ◽  
The Self ◽  
Mineral Admixture ◽  
Ring Test ◽  
Testing Time ◽  
Self Compacting Concrete ◽  
Test Range ◽  
Restrained Ring Test ◽  
Restrained Ring

In recent years, fly ash (FA) has been increasingly used widespread like a mineral admixture for the production of concrete in general and self-compacting concrete (SCC) in particular. Fly ash is an industrial by-product and is generated during the combustion of coal for energy production from the thermal power station. Fly ash is utilized to increase the workability of concrete mixtures and increase shrinkage resistance of the self-compacting concrete. In this paper, the mixture design of the self-compacting concrete with strength grade of 60 MPa is performed with requirement that the workability satisfies the slump flow, T500 and the V-Funnel TV test range from 650 to 800 mm, from 2 to 5 s and from 6 to 12 s, respectively. Besides, fly ash is used to replace cement with content of 15%, 25%, 35% and 50% to evaluate shrinkage resistance. The obtained results showed that using fly ash contents from 25% to 35% to replace cement can ensure workability of the mixture together with high degree of shrinkage restraint. According to ASTM C1581, the evaluation of restrained shrinkage of the self-compacting concrete based on the restrained ring test, this method reduces the testing time but still ensure the reliability. Keywords: fly ash; self-compacting concrete; shrinkage resistance; restrained ring test.

Hygro-mechanical modeling of restrained ring test: COST TU1404 benchmark

2019 ◽  
Vol 229 ◽  
pp. 116543 ◽  
Author(s):  
Vít Šmilauer ◽  
Petr Havlásek ◽  
Tobias Gasch ◽  
Arnaud Delaplace ◽  
David E.-M. Bouhjiti ◽  
...  
Keyword(s):  
Ring Test ◽  
Mechanical Modeling ◽  
Test Cost ◽  
Restrained Ring Test ◽  
Restrained Ring

scholarly journals Self Compacting Concrete – an Analysis of Properties using Fly Ash

2018 ◽  
Vol 7 (2.24) ◽  
pp. 135
Author(s):  
Dasarathy A K ◽  
M Tamil Selvi ◽  
D Leela ◽  
S Kumar
Keyword(s):  
Fly Ash ◽  
Low Cost ◽  
Cementitious Materials ◽  
The Self ◽  
Experimental Program ◽  
Reinforcing Bars ◽  
Self Compacting Concrete ◽  
Construction Market ◽  
Class F Fly Ash ◽  
Class F

Self  compacting concrete has ability involves not only high deformability of paste or mortar, but also resistance to segregation between coarse aggregate and  mortar  when the concrete flows  through the confined zone of reinforcing bars. Several researchers have employed the different methods to achieve self- compactability. In recent years, self-compacting concrete (SCC) has gained wide use for placement in congested reinforced  concrete structures with difficult casting conditions. For such applications, the fresh concrete must possess high fluidity and good cohesiveness. The initial results of an experimental program aimed at producing and evaluating SCC made with high volumes of fly ash are presented and discussed. Nine SCC mixtures and one control concrete were investigated in this study. The content of the cementitious materials was maintained constant (400 kg/m3), while the water / cementitious material ratios ranged from 0.35 to 0.45. The self-compacting mixtures had a cement replacement of 40,50 and 60% by Class F fly ash. Tests were carried out on all  mechanical properties of hardened concretes such as compressive strength were also determined. The self-compacting concretes developed a 28- day compressive strengths ranging from 26 to 48 MPa. The results show that an economical self-compacting concrete could be successfully developed by incorporating high-volumes of Class F fly ash. The present project investigates the making of self-compacting concrete more affordable for the construction market by replacing high volumes of Portland cement by fly ash. The study focuses on comparison of fresh properties of SCC containing varying amounts of fly ash with that containing commercially available admixture. Test result substantiate the feasibility to develop low cost SCC using Class F fly ash.  

Quantifying the Influence of Specimen Geometry on the Results of the Restrained Ring Test

2006 ◽  
Vol 3 (8) ◽  
pp. 100436 ◽  
Author(s):  
SW Dean ◽  
J-H Moon ◽  
F Rajabipour ◽  
B Pease ◽  
J Weiss
Keyword(s):  
Specimen Geometry ◽  
Ring Test ◽  
Restrained Ring Test ◽  
Restrained Ring

Study on the Influence of Mix Design Parameters on the Properties of Self-Compacting Concrete

2013 ◽  
Vol 857 ◽  
pp. 10-19
Author(s):  
Ji Liang Wang ◽  
Xiang Qian Wen ◽  
Jun Hong Shan ◽  
Ying Liu
Keyword(s):  
Fly Ash ◽  
Volume Content ◽  
Coarse Aggregate ◽  
Mineral Admixture ◽  
Design Parameters ◽  
Fine Aggregate ◽  
Test Results ◽  
Self Compacting Concrete ◽  
Volume Stability ◽  
Dry Shrinkage

the influence of mixing amount of mineral admixture, volume content of fine and coarse aggregate have been systematical studied on the workability, mechanical properties and volume stability of self-compacting concrete. Test results showed that with the fly ash content increased, the workability of self-compacting concrete improved significantly, early compressive strength decreased, but increase rate of later strength improved remarkably, and the mixing amount of fly ash inhibited significantly the dry shrinkage of self-compacting concrete; with the volume content of coarse aggregate increased, the workability of self-compacting concrete decreased significantly, but the volume stability of self-compacting concrete improved obviously, thus the optimum volume content of coarse aggregate of self-compacting concrete was range from 0.30 to 0.34; when the volume content of fine aggregate varied at the range of 0.40~0.50, there may be little effects on the workability of self-compacting concrete, but the increase self-compacting concretes volume content could reduce obviously the dry shrinkage of self-compacting concrete. Moreover, the variation in the volume content of coarse and fine aggregate should have slight influence on the early strength of self-compacting concrete, and the influence of the volume content variety on the later strength of self-compacting concrete could be neglected eventually.

scholarly journals STUDY OF SORPTIVITY OF SELF‐COMPACTING CONCRETE WITH MINERAL ADDITIVES

2006 ◽  
Vol 12 (3) ◽  
pp. 215-220 ◽  
Author(s):  
Luiz Antonio Pereira de Oliveira ◽  
João Paulo de Castro Gomes ◽  
Cristiana Nadir Gonilho Pereira
Keyword(s):  
Fly Ash ◽  
The Self ◽  
Capillary Absorption ◽  
Self Compacting Concrete ◽  
Normal Concrete ◽  
Hydraulic Lime ◽  
Concrete Mixtures ◽  
Slump Flow ◽  
Different Types ◽  
Mineral Additives

This work presents the results of a comparative study of the sorptivity, accomplished in mixtures of selfcompacting concrete with different types of additives and a normal concrete compacted by vibration. The self‐compacting concrete mixtures present slump‐flow of 650 ± 50 mm and have the same cement contents. In the self‐compacting mixtures, were used as additives, fly ash, silica fume, hydraulic lime and a mixture of fly ash and hydraulic lime. A modified carboxylates superplasticiser was used to obtain a specific workability. The capillary absorption was carried out at 7, 14 and 28 days of age, through a methodology described in the work. The results permit to conclude that the used additives propitiate the self‐compacting concrete. In terms of capillary absorption, the mixtures with fly ash have a better performance.

scholarly journals An Experimental Investigation on the Properties of High Volume Flyash Glass Fibre Reinforced Self Compacting Concrete

2019 ◽  
pp. 650-657
Author(s):  
Chikluru Arifa ◽  
K. Mohammed Rasheed ◽  
C. Ramachandrudu
Keyword(s):  
Fly Ash ◽  
High Strength ◽  
High Volume ◽  
The Self ◽  
Fibre Reinforcement ◽  
Self Compacting Concrete ◽  
Engineering Discipline ◽  
Binder Ratio ◽  
Glass Fibre Reinforced ◽  
Water To Binder Ratio

Civil engineering is a professional engineering discipline that deals with the designing and construction. In construction one of the main resource is concrete in the world. The concrete is day-to-day have many changes like strength, durability, shrinkage. This project deals with the self-compaction concrete with use of fibre reinforcement. The self-compacting in concrete is achieved by adding super plasticizers and glass fibres are used as reinforcement. The influence of including fly ash on the properties of self-compacting concrete is investigated. Fly ash is introduced by 50% in the total weight of cement. The water to binder ratio was maintained at 0.38%. Properties included workability, compressive strength, split tensile test, modulus of elasticity and shrinkage. The results indicate the high volume FA can be used in SCC to produce the high strength and low shrinkage. Increasing the admixture content beyond the certain level leads to a reduction in strength and increasing in absorption. Making concrete structure without compaction has been done in the past. Like placement of concrete under water by the use of term without compaction. Inaccessible areas were concrete using such a techniques. The production of such mixes use expensive admixtures ad large amount of cement but such type of concrete is low strength. To eliminate such issues lead to the development of self-compacting concrete (SCC). Usage of fibres makes the mixing of concrete complex. Self-compacting concrete (SCC) is an innovative concrete that does not require vibration for placing and compaction.

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