Effect of Fly Ash Content on Properties of PVA-ECC

Abstract

Abstract: The mechanical properties, toughness and impermeability of polyvinyl alcohol fiber reinforced cement-based composites (PVA-ECC) were studied by replacing part of cement (40%, 50%, 60% and 70% (mass fraction)) with fly ash. The correlation between the compressive strength of PVA-ECC and its ultimate tensile strength, bending load, flexural toughness index, deflection and impermeability was established. At the same time, the relationship between the compressive strength of PVA-ECC and its ultimate tensile strength, bending load, flexural toughness index, deflection and impermeability was established statistical data probability distribution analysis. The results show that with the increase of fly ash content, the strength decreases gradually, the ultimate tensile strain increases, the toughness index, energy absorption capacity and mid span deflection increase gradually, the impermeability of each group is improved compared with the 40% fly ash content group. The correlation between compressive strength and other indexes is established, and a complete correlation theoretical system of strength, toughness and impermeability is obtained. The normal distribution is used to analyze the frequency distribution histogram of water seepage height of PVA-ECC, and the probability distribution of seepage height is obtained, and the 95% confidence interval of the average seepage height is calculated.

Key words: fly ash, PVA-ECC, mechanical property, toughness index, deflection, impermeability

CLC Number:

TU528

LI Xiaoqin, ZHOU Xu, LI Shihua. Effect of Fly Ash Content on Properties of PVA-ECC[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2020, 39(12): 3783-3790.

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