Effect of expansive agent and curing condition on the properties of low-cost polyvinyl alcohol engineered cementitious composites
Effect of expansive agent and curing condition on the properties of low-cost polyvinyl alcohol engineered cementitious composites
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DOI：
10.1016/j.conbuildmat.2020.121169
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发表时间：
2020-11
影响因子：
7.4
通讯作者：
Jianjun Zhao;Changwang Yan;Shuguang Liu;Ju Zhang;C. Yunfei
中科院分区：
文献类型：
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作者：
Jianjun Zhao;Changwang Yan;Shuguang Liu;Ju Zhang;C. Yunfei
目前，传统的ECC材料存在水泥含量高、PVA纤维成本高等缺点，严重限制了其在工程中的应用。为了开发可持续发展的工程建筑材料，以国产聚乙烯醇（PVA）纤维为原料，制备了一种低成本、高韧性的工程水泥基复合材料（ECC）。研究了膨胀剂和养护条件对PVA-ECC力学性能、收缩率、早期水化程度和体积失水率的影响。用扫描电镜（SEM）分析了PVA-ECC的微观结构。试验结果表明，EA能有效提高PVA-ECC的弯曲和单轴拉伸性能，改善PVA-ECC的抗收缩性能、早期水化程度和体积失水率。出乎意料的是，PVA-ECC材料的最大单轴拉伸应变可以达到4.68%。此外，在自然固化条件下，当EA含量为10%时，PVA-ECC表现出超高的拉伸韧性。以上结果验证了国产PVA纤维在ECC中的可行性。该研究为PVA-ECC今后的发展开辟了新的方向。
At present, the traditional ECC material has the disadvantages of high cement content and high cost of PVA fiber, which seriously limits its application in engineering. In order to develop a sustainable building material for engineering, a low-cost and high toughness engineered cementitious composites (ECC) was prepared by using domestic polyvinyl alcohol (PVA) fiber. The effects of expansive agent (EA) and curing condition on the mechanical properties, shrinkage, early hydration degree and volume water loss rate of PVA-ECC were studied. The microstructure of PVA-ECC was analyzed by scanning electron microscopy (SEM). The test results show that EA can effectively improve the flexural and uniaxial tensile properties of PVA-ECC, as well as the shrinkage resistance, early hydration degree and volume water loss rate of PVA-ECC. Unexpectedly, the maximum uniaxial tensile strain of PVA-ECC material can reach 4.68%. In addition, it was found that PVA-ECC exhibited ultra-high tensile toughness when EA content was 10% under natural curing conditions. The above results verify the feasibility of domestic PVA fiber in ECC. This study can open up a new development direction for PVA-ECC in the future.