Effect of coral powder on the properties of cement-based materials

2019 International Conference on Advanced Electronic Materials, Computers and Materials Engineering

无线电电子学;计算机科学;材料科学

Cao, Y.^1 ; Wang, L.^1 ; Wu, H.^1 ; Wang, Z.^1 ; Yao, Y.^1

State Key Laboratory of Green Building Materials, China Building Materials Academy, Beijing

100024, China^1

关键词: Cement based material;    Coarse aggregates;    Fluidity of cement paste;    Hardened cement paste;    Offshore engineering;    Polycarboxylate superplasticizer;    Replacement level;    Supplementary cementitious material;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/563/2/022010/pdf
DOI  :  10.1088/1757-899X/563/2/022010

来源: IOP

【 摘 要 】

In the construction of offshore engineering, a growing number of coral sand and coarse aggregate is used as concrete aggregates in the local construction. Thereupon, a lot of coral powder is left as a solid waste. This work is an attempt to study the potential of the coral powder replacing part of cement as supplementary cementitious materials. The flow properties of fresh cement paste with coral powder were studied, as well as the mechanical properties of hardened cement paste. Experimental results show that the fluidity of cement paste blended with coral powder decrease with the dosage of micro coral powder, due to its high water demand and high adsorption of polycarboxylate superplasticizer (PCE). Replacement of cement by coral powder have positive effects on the cement hydration and mechanical properties of cement paste at early ages. However, at the curing age of 7 days, the addition of coral powders deceases the strength of cement paste regardless of replacement levels.