Effect of Water-Binder Ratio on Working Performance and Mechanical Properties of Recycled Brick Powder ECC

Abstract

Abstract: The recycled brick powder was used to replace quartz sand to prepare engineered cementitious composites (ECC). The working performance and mechanical properties of materials were studied and analyzed, and the related mechanism was discussed by scanning electron microscopy. The research shows that when the water-binder ratio changes from 0.30 (mass ratio, the same below) to 0.39, the slump of recycled brick powder ECC mixture is above 200 mm, and the working performance is good. Under the same water-binder ratio, the mechanical properties of ECC decrease after replacing quartz sand with recycled brick powder. When the water-binder ratio ranges from 0.30 to 0.37, the flexural strength of recycled brick powder ECC increases with the increase of water-binder ratio. When the water-binder ratio ranges from 0.30 to 0.39, the compressive strength of recycled brick powder ECC decreases with the increase of water-binder ratio. The recycled brick powder ECC in each group show good strain hardening characteristics, showing multi-crack cracking state, and the ultimate strain is greater than 2%. Under the experimental conditions in this paper, the flexural and uniaxial tensile properties of 0.37 water-binder ratio recycled brick powder ECC are the best.

Key words: engineered cementitious composites, recycled brick powder, recycled brick powder ECC, water-binder ratio, working performance, mechanical property

CLC Number:

TU528.06

YUAN Chengfang, LI Haofei, WANG Di, WANG Yiguang. Effect of Water-Binder Ratio on Working Performance and Mechanical Properties of Recycled Brick Powder ECC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(11): 3723-3729.

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