Study on the Standard Deviation for the Compressive Strength of Recycled Concrete

Zhang, Xue Bing; Fang, Zhi; Deng, Shou Chang

doi:10.4028/www.scientific.net/amr.639-640.313

Cited by 3 publications

(3 citation statements)

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“…It is observed that the maximum standard deviation reported was for SCC-NCA because of higher values of compressive strength (>35 MPa). Overall, the standard deviation values are in acceptable limits as per other studies [36]. Since the strength of the designed concrete in this study is greater than 40 MPa, it can satisfactorily be used as structural concrete [37].…”

Section: Discussionsupporting

confidence: 61%

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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Section: Discussionsupporting

confidence: 61%

Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

et al. 2021

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“…Standard deviation of compressive strength of concrete shows the fluctuations and variations in the strength of concrete. Higher value of standard deviation of strength indicates higher degree of inconsistency in quality of concrete and will lead to higher value of trial strength (Zhang et al, 2013). Standard deviation for any particular grade of concrete mix is used for evaluation of its target mean strength for which the concrete shall be designed and developed.…”

Section: Introductionmentioning

confidence: 99%

Statistical Characteristics of compressive strength of Normal & High strength concrete and concrete made with recycled aggregate

Ojha

Singh²,

Singh³

et al. 2022

ric

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The paper presents the statistical analysis on the compressive strength of concrete with strength ranging from 30 MPa to 130 MPa. To obtain these concrete strengths, concrete mixes with virgin aggregates were prepared with four different wate r to cementitious content (w/c) ratios i.e., 0.45, 0.36, 0.24, and 0.18. With w/c ratio of 0.45, a mix is also designed using recycled construction and demolition coarse aggregate to compare statistical characteristics with respect to concrete made using virgin aggregates. The presented statistical analysis includes measure of central tendency, dispersion of the data, distribution shape properties, and precision of the mean. A normal and a log-normal distribution has been established and validated for the experimental data set of all the mixes. A correlation has also been established for the compressive strength of 100mm cube and 150mm cube. Analysis shows an increase in dispersion of data with increase in the mean compressive strength of the mix. The mix with Construction and demolition waste aggregate shows a higher standard deviation than the mix with virgin aggregates at the same w/c ratio. The correlation curve for the compressive strength of 100 mm and 150 mm size cubes, shows a conversion factor of 1.04, suggesting an insignificant difference of the compressive strength values of 100 mm and 150 mm cubes for the mix studied.

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“…Zhang [2] discovered that the recycled concrete made from the saturated recycled aggregate by cement paste showed a low discreteness. However, he didn't offer a method to ensure the discreteness of concrete within the standard values.…”

Section: Introductionmentioning

confidence: 99%

Mechanical properties of concrete made from aggregate saturated in concrete interfacial agent

Li¹,

Wu²,

Li³

et al. 2015

Proceedings of the 5th International Conference on Civil Engineering and Transportation 2015

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Abstract.Based on the fact that aggregate surface features have a great effect on the performance of concrete, a method for improving concrete performance by modifying aggregate surface features was proposed. Specifically, with aggregates immersed into concrete interfacial agent (CIA) suspension to increase the bond strength of interfaces between the aggregates and mortar, mechanical properties of concrete were improved. Two group experiments were carried out and the results show that concrete with coarse aggregates saturated in CIA has higher cubic compressive strength and lower discreteness of the strength than that of conventional concrete, and cement paste grade 52.5 has a better modification result than RH-1 paste.

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Study on the Standard Deviation for the Compressive Strength of Recycled Concrete

Cited by 3 publications

References 0 publications

Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

Mechanical Properties of Concrete with Recycled Concrete Aggregate and Fly Ash

Statistical Characteristics of compressive strength of Normal & High strength concrete and concrete made with recycled aggregate

Mechanical properties of concrete made from aggregate saturated in concrete interfacial agent

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