低干燥收缩性能的工程水泥基复合材料配合比研究

姚仲泳

doi:10.13204/j.gyjzG20110912

低干燥收缩性能的工程水泥基复合材料配合比研究

doi: 10.13204/j.gyjzG20110912

姚仲泳

平潭综合实验区城乡建设与交通运输服务中心, 福州 350400

基金项目:

福建省交通厅重点项目(201914)。

详细信息

作者简介:
姚仲泳,男,1981年出生,硕士,高级工程师。电子信箱:4262134@qq.com

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出版历程
- 收稿日期: 2020-11-09

Research on Mix Proportion of ECC with Low Drying Shrinkage

YAO Zhongyong

Urban and Rural Construction and Transportation Service Center in Pingtan Comprehensive Experimental Zone, Fuzhou 350400, China

摘要

摘要: 为了降低传统工程水泥基复合材料(ECC)的干燥收缩应变,减小混凝土与ECC之间的收缩差异,首先确定水胶比和砂胶比,使得ECC的尺寸变化率与混凝土变形协调;其次,基于正交法研究粉煤灰掺量、矿粉掺量和PVA纤维掺量对ECC干燥收缩率的影响,进一步优化干燥收缩值。最后,研究该配合比ECC的拉、压、弯性能,以保证结构构件的力学性能。结果表明:ECC的收缩应变随着水胶比和砂胶比的增加而增大,且水胶比对干燥收缩的影响远大于砂胶比;另外,随着粉煤灰掺量、矿粉掺量和PVA纤维掺量的增加而减小,其中粉煤灰对干燥收缩的抑制效果最佳,矿粉次之,PVA纤维对其影响最小。低干缩ECC的抗压强度达44.5 MPa以上,抗拉和抗弯强度分别超过2.5,10 MPa,极限拉应变稳定超过3%。
- 工程水泥基复合材料 /
- 干燥收缩 /
- 配合比 /
- 正交试验 /
- 力学性能
Abstract: In order to reduce the drying shrinkage strain of traditional ECC and the shrinkage difference between concrete and ECC, firstly the paper determined the water-binder ratio and sand-rubber ratio, so that the ECC’s dimensional change rate was coordinated with the concrete deformation; secondly, the effects of fly ash content, mineral powder content and PVA fiber content on ECC drying shrinkage rate were studied based on orthogonal method, the drying shrinkage value was further optimized. Finally, the tensile, compression, and bending properties of the ECC were studied to ensure the mechanical properties of structural members. The results showed that the shrinkage strain of ECC increased with the increase of water-binder ratio and sand-rubber ratio, and the effect of water-binder ratio on drying shrinkage was much greater than that of sand-rubber ratio; in addition, the shrinkage value decreased with the increase of fly ash content, mineral powder content and PVA fiber content. Among them, fly ash had the best inhibitory effect on drying shrinkage, followed by mineral powder, and PVA fiber had the smallest effect on it. The compressive strength of the ECC with low drying shrinkage could reach 44.5 MPa, and the tensile and flexural strengths reached 2.5 MPa and 10 MPa respectively, and the ultimate tensile strain was stable more than 3%.
- ECC /
- drying shrinkage /
- mix proportion /
- orthogonal method /
- mechanical properties

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