Effect of recycled coarse aggregate and manufactured sand in self compacting concrete

Mahakavi, P.; Chithra, R.

doi:10.1080/13287982.2019.1636519

Cited by 21 publications

(12 citation statements)

References 19 publications

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“…When compared with some studies SCC using 100% CS, it can be seen that the compressive strength of 43.5 MPa of the optimal mix with W/ B = 0.34, SF/ C = 6.6% and FA/ B= 30% is slightly lower than 47.1 MPa of the specimens noted SCC+5%SF with W/B=0.31, SF/C= 5.3%, and FA/B= 20% [8]; and remarkably greater than the 33.79 MPa of M100 sample with W/ B = 0.32, SF/ C = 6.2%, FA/ B = 0% [7]. Both the compared samples have smaller W/B and FA/ B ratios, which indicates the efficiency of determining the optimal mix used in this study.…”

Section: Optimal Scc MIX and Control Scc Mixmentioning

confidence: 65%

“…Therefore, it is necessary to study adjusting SCC proportion with crushed aggregate to meet SCC technical requirements. A significant number of previous studies have been carried out replacing natural sand aggregate with crushed sand at a replacement range of about 25-100% to make SCC [7,8,9]. As a result, it is reported that river sand can be replaced by 100% artificial sand.…”

Section: Introductionmentioning

confidence: 99%

“…However, Vinayak S. and Popat K. suggested that it remain satisfactory workability and compressive strength and reduce the appearance of cracks with a maximum replacement ratio of 60% [10]. Besides, only a few studies mention the combination of coarse aggregates to produce SCC [7,9].…”

Section: Introductionmentioning

confidence: 99%

“…Due to the high content of powders, mineral admixtures such as limestone, fly ash, silica fume are often used as partial substitutes for cement to reduce the heat of hydration, reduce shrinkage, and increase the durability of SCC [7,8,9]. Limestone replaces fine aggregate with a 0-20% content, reducing slump flow but still meeting the SCC flowability requirement while enhancing the segregation resistance [9].…”

Section: Introductionmentioning

confidence: 99%

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Optimizing Mixture of Self-Compacting Concrete for Constructing a Spillway Surface Structure

Long¹

2021

GEOMATE

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A spillway apron is a popular hydraulic work with congested reinforcement and complex shapes. Self-compacting concrete (SCC) with excellent workability can meet the technical requirements for the work. This study focuses on determining the SCC optimal mix for efficient use of local coarse aggregates and 100% crushed sand to construct a spillway surface structure. For the purpose, research steps were carried out as follows: (1) optimize mix ratio of coarse aggregates ; (2) determine the saturated content of superplasticizer, (3) design SCC preliminary mix; (4) set up an experimental plan; and (5) analyze test data to point out the optimal SCC mix. The investigation of fresh SCC was conducted by slump flow test, slump flow time test, Lbox test, and segregation resistance test. Compressive strength, water tightness, and underwater abrasion of hardened SCC were also evaluated. The abrasion tests follow the ASTM C1138-19 method and Yu-Wen Liu's method. The results show that the optimal SCC with slump-flow of 72 cm, the H2/H1 ratio of 0.85, compressive strength at 28 days of 42.5 MPa, abrasion resistance of 0.34 g/cm 2 ; and water tightness of B10 meets specifications of a spillway surface structure. Besides, the abrasion depth measured by Yu-Wen Liu's method of water-borne sand was about four times greater than that of ASTM C1138-19.

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Section: Optimal Scc MIX and Control Scc Mixmentioning

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Optimizing Mixture of Self-Compacting Concrete for Constructing a Spillway Surface Structure

Long¹

2021

GEOMATE

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“…RCA's mechanical properties can be improved by the appropriate use of nanomaterials, like Nanosilica and Nano-CaCO3. In some cases, higher compressive strength was obtained [24]. Combining slag, silica fume, and fly ash can gain more compressive strength to compensate for its reduction due to RCA in SCC.…”

Section: Introductionmentioning

confidence: 97%

Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

et al. 2021

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Recycled concrete aggregate (RCA) collected from the demolition of old reinforced concrete structures can be reused to prepare structural and non-structural concrete, thereby protecting the environment by preserving natural resources. This study explores RCA’s use, collected from the crushed concrete of different building projects in Riyadh, to manufacture fresh self-compacting concrete (SCC) and investigate its properties in the fresh and hardened state. Four SCC mixes were prepared by replacing natural aggregate (NA) with RCA at 0%, 25%, 50%, and 75% replacement levels. The water-cement (w/c) ratio was maintained constant at 0.38 for all the mixes. Slump Flow, J-ring, and V-funnel tests were performed on the SCC mixes in the fresh state, and the compressive strength of hardened concrete was determined after seven, 14, and 28 days. Water absorption and split tensile tests were also carried out for all the mixes. The findings revealed that it is possible to reach compressive strengths higher than 40 MPa at 28 days for RCA replacement level of 75% by using a superplasticizer and low w/c ratio. The decrease in compressive strength concerning the SCC-NA mix was 25% for 75% replacement level. The highest split tensile strength at 28 days was around 3.3 MPa for a 50% replacement level. The lowest water absorption was 3.2% for SCC-NA, which was gradually increased and was highest at 5.6% for 75% replacement level.

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Study on the performance of hydrophilic curing agent and environmentally friendly non-pozzolanic filler for the development of self-curing self-compacting concrete

Manjunath,

Mousavi,

Bhagithimar

et al. 2024

Environ Sci Pollut Res

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Effect of recycled coarse aggregate and manufactured sand in self compacting concrete

Cited by 21 publications

References 19 publications

Optimizing Mixture of Self-Compacting Concrete for Constructing a Spillway Surface Structure

Optimizing Mixture of Self-Compacting Concrete for Constructing a Spillway Surface Structure

Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

Study on the performance of hydrophilic curing agent and environmentally friendly non-pozzolanic filler for the development of self-curing self-compacting concrete

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