scholarly journals Recycled Aggregate Pervious Concrete: Analysis of Influence of Water-Cement Ratio and Fly Ash under Single Action and Optimal Design of Mix Proportion

2022 ◽  
Vol 10 (3) ◽  
pp. 799-819
Author(s):  
Shoukai Chen ◽  
Chunpeng Xing ◽  
Mengdie Zhao ◽  
Junfeng Zhang ◽  
Lunyan Wang ◽  
...  
Keyword(s):  
Fly Ash ◽  
Optimal Design ◽  
Pervious Concrete ◽  
Recycled Aggregate ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Single Action ◽  
Mix Proportion ◽  
Influence Of Water

Experimental Research on Pore Structure of RCA and its Impact on Drying Shrinkage

2011 ◽  
Vol 335-336 ◽  
pp. 1141-1144 ◽  
Author(s):  
Yun Xiang He
Keyword(s):  
Fly Ash ◽  
Pore Structure ◽  
Drying Shrinkage ◽  
Recycled Aggregate ◽  
Structure Theory ◽  
Replacement Rate ◽  
Pore Characteristics ◽  
Cement Ratio ◽  
Mix Proportion ◽  
The Impact

Pore structure is one of the main influencing factors of materials drying shrinkage. C30 natural mix proportion is used as reference, the impact of replacement rate of recycled aggregate, the mixing amount of fly ash, water reducer, expansion agent and water-cement ratio on recycled aggregate concrete’s porosity and pore characteristics was studied. Based on the pore structure theory, the influence of porosity and pore characteristics on recycled aggregate concrete’s drying shrinkage is analyzed.

Effect of Admixed Recycled Aggregate on Properties of Recycled Concrete

2012 ◽  
Vol 174-177 ◽  
pp. 743-746
Author(s):  
Ya Jun Zhao ◽  
Ying Gao ◽  
Li Li He
Keyword(s):  
Compressive Strength ◽  
Design Method ◽  
Orthogonal Design ◽  
Plain Concrete ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Influence Of Water ◽  
The Impact

The mixture proportion of recycled concrete was discussed by orthogonal design method. The influence of water-cement ratio, recycled aggregate quantity on workability, cube compressive strength of recycled concrete was analyzed. The experimental results indicated that，Recycled concrete mix proportion design should consider the impact of the water absorption of recycled aggregate. Unit water amount of recycled concrete should be plain concrete unit water consumption and recycled aggregate additional amount of water. Sand ratio should increase in the corresponding ordinary aggregate concrete sand ratio on the basis of 1 to 3 percent. When the water-cement ratio is 0.36 and construction waste content of 40% slag content of 20%, 28d compressive strength of concrete is 48.1MPa, slightly higher than the reference concrete (48.0MPa).

Survey on Factors Affecting Impermeability of Waterproof Concrete

2011 ◽  
Vol 250-253 ◽  
pp. 1320-1323
Author(s):  
Yi Jin Li ◽  
Yun Li Gong ◽  
Jian Yin
Keyword(s):  
Fly Ash ◽  
Ash Content ◽  
Raw Material ◽  
Factors Affecting ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Mix Proportion

This paper describes the influence of raw material, water-cement ratio, sand ratio, cement-sand ratio and fly ash content on impermeability of waterproof concrete. The value ranges of several important mix parameters are summarized, that provides the reference to select the parameters of mix proportion of waterproof concrete for subway.

scholarly journals Study on the Permeability of Recycled Aggregate Pervious Concrete with Fibers

Materials ◽  
2020 ◽  
Vol 13 (2) ◽  
pp. 321 ◽  
Author(s):  
Haitang Zhu ◽  
Chengcheng Wen ◽  
Zhanqiao Wang ◽  
Lan Li
Keyword(s):  
Compressive Strength ◽  
Permeability Coefficient ◽  
Polypropylene Fiber ◽  
Volumetric Analysis ◽  
Pervious Concrete ◽  
Recycled Aggregate ◽  
Fiber Types ◽  
Cross Sectional ◽  
Cement Ratio ◽  
Water Cement Ratio

Pervious concrete is considered to be porous concrete because of its pore structure and excellent permeability. In general, larger porosity will increase the permeability coefficient, but will significantly decrease the compressive strength. The effects of water-cement ratio, fiber types, and fiber content on the permeability coefficient, porosity, compressive strength, and flexural strength were investigated. The pore tortuosity of the pervious concrete was determined by volumetric analysis and two-dimensional cross-sectional image analysis. The concept and calculation method of porosity tortuosity were further proposed. Results show that the permeability coefficient of the pervious concrete is the most suitable with a water-cement ratio of 0.30; the water permeability of the pervious concrete is influenced by fiber diameter. The permeability coefficient of pervious concrete with polypropylene thick fiber (PPTF) is greater than that with copper coated steel fiber (CCF) and the polypropylene fiber (PPF). The permeability coefficient is related to tortuosity and porosity, but when porosity is the same, the permeability coefficient may be different. Finally, general relations between the permeability coefficient and porosity tortuosity are constructed.

Effects of Temperature on Drying Shrinkage of Concrete

2014 ◽  
Vol 584-586 ◽  
pp. 1176-1181 ◽  
Author(s):  
Ying Zi Yang ◽  
Mao Guang Li ◽  
Hong Wei Deng ◽  
Qi Liu
Keyword(s):  
Fly Ash ◽  
Silica Fume ◽  
Drying Shrinkage ◽  
Shrinkage Strain ◽  
Mineral Admixture ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Granulated Blast Furnace Slag ◽  
Influence Of Water ◽  
Effects Of Temperature

The present study investigated experimentally effects of temperature on drying shrinkage of concrete in different water cement ratio and containing mineral admixture. Concrete was exposed to a controlled environment of 20±1oC, 35±1oC, 50±1oC, and 60% ± 5 RH, respectively. The drying shrinkage of concretes with water cement ratio of 0.3, 0.4 and 0.5 were evaluated. The resuluts showed that with the increase of temperature from 20 oC to 50 oC, the influence of water cement ratio on drying shrinkage of concrete was gradually weakened. The shrinkage strain of concretes with replacement of cement by 20% of ground granulated blast-furnace slag (GGBS), 10% of silica fume (SF), and 20% of fly ash (FA) were measured, respectively. Test results showed that GGBS had a little impact on drying shrinkage of concrete; Silica fume could increase the drying shrinkage of concrete significantly in the early and later ages, especially when concrete was subjected to high temperature; Fly ash reduced drying shrinkage in early ages and increased drying shrinkage of concrete in the later ages.

scholarly journals Modeling Fly Ash and Water Cement Ratio Influence on High Compressive Strength of Concrete

2020 ◽  
Vol 4 (1) ◽  
Keyword(s):  
Compressive Strength ◽  
Fly Ash ◽  
Modeling And Simulation ◽  
High Strength ◽  
Partial Replacement ◽  
Strength Development ◽  
Rate Variation ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Mix Proportion

This paper monitors the behaviour of compressive strength influenced by variation of water cement ratios and fly ash as partial replacement for cement. The study has express the pressure from this material from water cement ratios and fly ash on the designed mixed for high strength concrete, the study generated various compressive strength base on mixed proportions, this were applied to determine strength development at different mix proportion, such application generated compressive strength values numerically and analytically, this application was applied to compare the strength rate at every twenty four hours and that of seven days interval, the growth rate variation from the water cement ratios was applied to determine the mixed proportion to be applied that will always generate better strength, pending on the level of applied impose loads, furthermore, the study monitor increase rate of fly ash as partial replacement against the percentage dosage of fly ash content, these observed strength at optimum growth were recorded at 25%, variation increase on compressive strength from water cement ratios were between [0.23,0.40 and 0.50] it was observed that water cement ratio of [0.23] obtained the maximum strength compare to [0.40,and 0.50], the study applying modeling and simulation were subjected to model validation, and both parameters developed best fits correlations, the study has express various rate these material can develop strength applying modeling and simulation.

Test to Fly Ash Recycled Concrete under Different Water Cement Ratio

2013 ◽  
Vol 303-306 ◽  
pp. 2606-2610
Author(s):  
Ming Zheng Chen ◽  
Xian Feng Liu ◽  
Lin Qing Huang
Keyword(s):  
Fly Ash ◽  
Performance Test ◽  
Mechanical Performance ◽  
Influence Factors ◽  
Engineering Application ◽  
Recycled Concrete ◽  
Recycled Aggregate ◽  
Cement Ratio ◽  
Water Cement Ratio ◽  
Solid Foundation

The recovery and utilization to building solid waste is the current hot issues in the construction of towns. In this paper, 30 groups of fly ash recycled concrete test cube were designed and produced, through the mechanical performance test research, we analysised the main influence factors to the strength and performances of fly ash regeneration concrete test cube,such as recycled aggregate category, water cement ratio, the admix proportion of recycled aggregate. The test results would lay a solid foundation for the test research and engineering application of recycled concrete.

Study on Pervious Road Brick Prepared by Recycled Aggregate Concrete

2006 ◽  
Vol 302-303 ◽  
pp. 321-328 ◽  
Author(s):  
Han Dong Yan ◽  
Guo Hui Huang
Keyword(s):  
Mechanical Properties ◽  
Recycled Aggregate Concrete ◽  
Pervious Concrete ◽  
Recycled Aggregate ◽  
Aggregate Concrete ◽  
Cement Ratio ◽  
Mix Proportion ◽  
Water To Cement Ratio ◽  
Chinese Standard ◽  
Coefficient Method

The influence of aggregate to cement ratio(A/C), sand to aggregate ratio(S/A) and water to cement ratio(W/C) on mechanical properties and pervious coefficient of pervious concrete prepared by recycled aggregate were systematically investigated in the paper. The optimum mix proportion by weight of pervious concrete prepared by recycled aggregate were 3.5 of aggregate to cement ratio, 0.15 of sand to aggregate ratio and 0.34 of water to cement ratio, resulted from an effect coefficient method. Flexural strength and compressive strength of pervious concrete road brick prepared by recycled aggregate concrete could satisfy the requirements of Chinese Standard for Concrete Road Brick (JC/T466-2000) and had good pervious performance.

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