Autogenous shrinkage and nano-mechanical properties of UHPC containing waste brick powder derived from construction and demolition waste

He, Zhihai; Zhu, Haonan; Zhang, Mengyuan; Shi, Jinyan; Du, Shigui; Liu, Baoju

doi:10.1016/j.conbuildmat.2021.124869

Cited by 60 publications

(12 citation statements)

References 31 publications

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“…Using supplementary cementitious materials (SCMs) is a promising solution to decrease PC consumption while disposing of waste materials from diverse industries [53][54][55]. SCMs have been a primary focus for enhancing concrete sustainability [56,57]. Agricultural wastes such as palm oil fuel ash (POFA), rice husk ash (RHA), olive pomace ash (OOA), sugarcane bagasse ash (SBA), and industrial wastes such as fly ash (FA) and silica fume (SF) can be used as partial replacements for cement in sustainable concrete [58,59].…”

Section: Research Significancementioning

confidence: 99%

Multi-Objective Optimization of Sustainable Concrete Containing Fly Ash Based on Environmental and Mechanical Considerations

et al. 2022

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Infrastructure design, construction and development experts are making frantic efforts to overcome the overbearing effects of greenhouse gas emissions resulting from the continued dependence on the utilization of conventional cement as a construction material on our planet. The amount of CO2 emitted during cement production, transportation to construction sites, and handling during construction activities to produce concrete is alarming. The present research work is focused on proposing intelligent models for fly ash (FA)-based concrete comprising cement, fine and coarse aggregates (FAg and CAg), FA, and water as mix constituents based on environmental impact (P) considerations in an attempt to foster healthier and greener concrete production and aid the environment. FA as a construction material is discharged as a waste material from power plants in large amounts across the world. Its utilization as a supplementary cement ensures a sustainable waste management mechanism and is beneficial for the environment too; hence, this research work is a multi-objective exercise. Intelligent models are proposed for multiple concrete mixes utilizing FA as a replacement for cement to predict 28-day concrete compressive strength and life cycle assessment (LCA) for cement with FA. The data collected show that the concrete mixes with a higher amount of FA had a lesser impact on the environment, while the environmental impact was higher for those mixes with a higher amount of cement. The models which utilized the learning abilities of ANN (-BP, -GRG, and -GA), GP and EPR showed great speed and robustness with R2 performance indices (SSE) of 0.986 (5.1), 0.983 (5.8), 0.974 (7.0), 0.78 (19.1), and 0.957 (10.1) for Fc, respectively, and 0.994 (2.2), 0.999 (0.8), 0.999 (1.0), 0.999 (0.8), and 1.00 (0.4) for P, respectively. Overall, this shows that ANN-BP outclassed the rest in performance in predicting Fc, while EPR outclassed the others in predicting P. Relative importance analyses conducted on the constituent materials showed that FA had relatively good importance in the concrete mixes. However, closed-form model equations are proposed to optimize the amount of FA and cement that will provide the needed strength levels without jeopardizing the health of the environment.

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Section: Research Significancementioning

confidence: 99%

Multi-Objective Optimization of Sustainable Concrete Containing Fly Ash Based on Environmental and Mechanical Considerations

et al. 2022

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“…When the fineness of WBP is close to or lower than that of cement, the compressive strength decreases with the increase in the WBP substitution ratio. Zhi-hai He et al [ 28 ] used recycled brick powder (RBP) to replace part of the silicon powder (SF) and discussed the effect of the RBP content on the strength and autogenous shrinkage of the UHPC material. The results show that the strength of the material can be reduced by using 30–45% RBP instead of SF, but the strength of the material can be significantly improved by using 15% RBP.…”

Section: Introductionmentioning

confidence: 99%

The Basic Mechanical Properties and Shrinkage Properties of Recycled Micropowder UHPC

Yuan

Chen

et al. 2023

Materials

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Using waste clay brick powder (RBP) to partially replace cement in the preparation of concrete, is one way to recycle construction waste. In order to investigate the physical and mechanical properties and volume stability of recycled micropowder ultra-high-performance concrete (UHPC), the basic mechanical and shrinkage properties of recycled micropowder UHPC were studied at replacement rates of 10%, 20%, 30%, 40% and 50%. The results show that: (1) When the activated recycled brick powder is used to replace the cement, the compressive strength, flexural strength and splitting tensile strength of the UHPC initially increase and then decrease with the increase in the substitution rate. When the substitution rate is 10%, the 28 d compressive strength, flexural strength and splitting tensile strength of the UHPC are the highest; (2) Replacing cement with recycled brick powder can reduce the autogenous shrinkage of the UHPC, and the autogenous shrinkage rate of the UHPC decreases with the increase in the brick powder replacement rate. The drying shrinkage of the UHPC can be reduced by replacing cement with recycled brick powder. The drying shrinkage of the UHPC initially decreases, and then increases, with the increase in the replacement rate of brick powder. When the replacement rate of the brick powder was 30%, the drying shrinkage of the UHPC was the least, and this was 49.7% lower than that in the benchmark group. The prediction models of autogenous shrinkage and drying shrinkage are in good agreement with the experimental results, which can be used to predict the shrinkage development of recycled brick powder UHPC.

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“…This not only meets the increasing need for concrete, but also significantly reduces the direct danger to society [ 41 ]. Numerous researchers in the building sector have focused on the utilization of waste resources, particularly SCMs [ 42 , 43 ]. The production of environmentally friendly concrete has been critical to decreasing GHG emissions [ 44 ].…”

Section: Introductionmentioning

confidence: 99%

Mapping Research Knowledge on Rice Husk Ash Application in Concrete: A Scientometric Review

2022

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This study aimed to carry out a scientometric review of rice husk ash (RHA) concrete to assess the various aspects of the literature. Conventional review studies have limitations in terms of their capacity to connect disparate portions of the literature in a comprehensive and accurate manner. Science mapping, co-occurrence, and co-citation are a few of the most difficult phases of advanced research. The sources with the most articles, co-occurrences of keywords, the most prolific authors in terms of publications and citations, and areas actively involved in RHA concrete research are identified during the analysis. The Scopus database was used to extract bibliometric data for 917 publications that were then analyzed using the VOSviewer (version: 1.6.17) application. This study will benefit academics in establishing joint ventures and sharing innovative ideas and strategies because of the statistical and graphical representation of contributing authors and countries.

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Autogenous shrinkage and nano-mechanical properties of UHPC containing waste brick powder derived from construction and demolition waste

Cited by 60 publications

References 31 publications

Multi-Objective Optimization of Sustainable Concrete Containing Fly Ash Based on Environmental and Mechanical Considerations

Multi-Objective Optimization of Sustainable Concrete Containing Fly Ash Based on Environmental and Mechanical Considerations

The Basic Mechanical Properties and Shrinkage Properties of Recycled Micropowder UHPC

Mapping Research Knowledge on Rice Husk Ash Application in Concrete: A Scientometric Review

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