纤维掺量对高延性水泥基复合材料塑性收缩的影响

摘要

早期塑性收缩对高延性水泥基复合材料(ECC)应用效果有直接影响.通过非接触式收缩试验研究了纤维掺量对ECC早期塑性收缩的影响.结果表明,在掺量小于0.9％时,随着聚乙烯醇(PVA)纤维体积掺量的增加,早期塑性收缩量逐渐减小,但纤维掺量超过0.9％后,早期塑性收缩值趋于稳定.基于试验结果,通过回归分析提出了适用于高纤维掺量的ECC早期塑性收缩值预测公式.%Application of engineered cementitious composite (ECC) was directly influenced by early plastic shrinkage.The effect of fiber volume fraction on early plastic shrinkage of ECC was researched by means of non-contact sensor.The results showed that the early plastic shrinkage of ECC decreased with the increasing of polyvinyl alcohol (PVA) fiber volume fraction,whose content was from 0 to 0.9％.However,the early plastic shrinkage stabilized when the fiber volume fraction was more than 0.9％.Formula for predicting early shrinkage of high fiber volume fraction ECC was designed by regression analysis based on the test results.