Experimental investigation of compressive strength for fly ash on high strength concrete C-55 grade

Fantu, Temesgen; Alemayehu, Getasew; Kebede, Getachew; Abebe, Yeshi; Selvaraj, Senthil Kumaran; Paramasivam, Velmurugan

doi:10.1016/j.matpr.2021.01.213

Cited by 16 publications

(15 citation statements)

References 10 publications

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“…In contrast, the slump values of BAC at all FA replacement levels gradually decreased compared to that of the control concrete. Similar findings were reported by preceding studies [ 36 , 51 ], which demonstrated that increasing FA content in concrete reduced slump values, which means decrease in workability. This is attributed to the dry and irregular shape of FA, which requires more water and increases friction, reducing the flow-ability of concrete [ 35 , 52 ].…”

Section: Resultssupporting

confidence: 92%

“…This is attributed to the dry and irregular shape of FA, which requires more water and increases friction, reducing the flow-ability of concrete [ 35 , 52 ]. According to Fantu et al [ 51 ], the workability of fresh concrete reduces when the inclusion of FA exceeds 10% of the cement. The non-spherical, elongated, irregular shapes and rough surfaces of FA particles ( Fig.…”

Section: Resultsmentioning

confidence: 99%

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Mechanical properties and microstructure of brick aggregate concrete with raw fly ash as a partial replacement of cement

Islam,

Noaman,

Islam

et al. 2024

Heliyon

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Section: Resultssupporting

confidence: 92%

Section: Resultsmentioning

confidence: 99%

Mechanical properties and microstructure of brick aggregate concrete with raw fly ash as a partial replacement of cement

Islam,

Noaman,

Islam

et al. 2024

Heliyon

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“…Fly ash is widely used as a supplementary cementitious material (SCM) in concrete due to its pozzolanic reaction. Higher workability of concrete mixture with a higher volume of fly ash was reported in many previous studies [8][9][10][11][12]. The compressive strength of fly ash concrete increases in the long term when compared to that of conventional concrete due to the pozzolanic reaction generating denser pore structure in concrete [13][14][15].…”

Section: Introductionmentioning

confidence: 70%

Influence of Initial Temperature of Fresh Concrete on Compressive Strength of Concrete

Nguyen¹

2023

GEOMATE

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This paper aims to evaluate the influence of initial temperature of fresh concrete on compressive strength and degree of reactions of binder in concrete with and without fly ash. The aggregates are cooled before being used to mix the concrete to achieve the temperatures of fresh concrete of 18°C, 25°C, and 30°C. After 24 hours in the mould, the concrete specimens are continually cured in water at 28 ± 2°C. Test results indicate that the compressive strength of the concrete at an early age decreases when the initial temperature of the fresh concrete decreases. However, the compressive strength of concrete at 91 days increases in the case of low initial temperature of fresh concrete. The effect of initial cooling is more obvious in concrete with higher fly ash content. The bound water, degree of reactions, and C-S-H content, the paste samples were analyzed by TGA. The lower initial temperature of fresh concrete leads to a lower rate of the degree of reaction and produces less amount of C-S-H at an early age. The degree of reaction of the binder at an early age affects early strength and long-term pozzolanic reaction that causes long-term strength. A lower initial temperature of fresh concrete reduces the early hydration of cement and delays the start of the pozzolanic reaction, resulting in an enhancement of the compressive strength at later ages. The degree of reaction and C-S-H content correlated well with the compressive strength of the concrete at early and long-term ages.

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“…e high fly ash content can cause problems such as low strength and carbonation of concrete at an early stage [28]. Meanwhile, excessive amounts of fly ash can decrease the workability and compressive strength of concrete (Temesge et al) [29].…”

Section: Compressive Strengthmentioning

confidence: 99%

Design and Performance Evaluation of Dry-Mixed Cement Recycled Aggregate Pile

Shang¹,

Feng²,

Rong³

et al. 2022

Advances in Materials Science and Engineering

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In this paper, dry-mixed recycled cement concrete gravel (CCG) piles and dry-mixed cement macadam gravel (CMG) piles were analyzed. CCG and CMG were prepared by using recycled concrete aggregate (RCA) with different substitution rates, recycled macadam aggregate (RMA) from waste bricks and tiles, and fly ash, respectively. Mechanical properties, hydration heat release performance, and frost resistance were used as evaluation factors. The compressive strength, hydration heat, relative dynamic elastic modulus, and mass loss rate were tested. Based on the requirements of subgrade reinforcement on the material strength, hydration heat release, and frost resistance of dry-mixed CRA piles, TOPSIS analysis method was used to conduct a comprehensive evaluation. The results show that the mechanical properties and frost resistance of CCG and CMG gradually deteriorate with the increase of RCA and RMA replacement rates. At the same time, the hydration heat release of CCG and CMG increases with the increase of the replacement rate. The fly ash instead of cement can improve the compressive strength and frost resistance of CCG and CMG and reduce the hydration heat and material cost. When the CCG replacement rate reaches 20%, the CCG composite score of 20% fly ash is higher than that of traditional dry-mixed cement gravel pile and has better comprehensive performance.

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Experimental investigation of compressive strength for fly ash on high strength concrete C-55 grade

Cited by 16 publications

References 10 publications

Mechanical properties and microstructure of brick aggregate concrete with raw fly ash as a partial replacement of cement

Mechanical properties and microstructure of brick aggregate concrete with raw fly ash as a partial replacement of cement

Influence of Initial Temperature of Fresh Concrete on Compressive Strength of Concrete

Design and Performance Evaluation of Dry-Mixed Cement Recycled Aggregate Pile

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