Zhang Wei, Yin Chenglong, Ma Fuquan, Huang Zhiyi
College of Civil Engineering and Architecture, Zhejiang University, 866 Yuhangtang Road, Hangzhou 310000, China.
Materials (Basel). 2018 Jul 5;11(7):1147. doi: 10.3390/ma11071147.
Herein, the mechanical properties and carbonation durability of engineered cementitious composites (ECC) were studied. For the cost-efficient utilization of ECC materials, different types of specimens were cast with polypropylene (PP) and hydrophilic polyvinyl alcohol (HPVA) fibers. The compressive strength, Poisson’s ratio, strength-deflection curves, cracking/post-cracking strength, impact index, and tensile strain-stress curves of two types of ECC materials, with differing fiber contents of 0 vol %, 1 vol %, 1.5 vol %, and 2 vol %, were investigated with the use of compressive tests, four-point bending tests, drop-weight tests, and uniaxial tensile tests. In addition, the matrix microstructure and failure morphology of the fiber in the ECC materials were studied by scanning electron microscopy (SEM) analysis. Furthermore, carbonation tests and characterization of steel corrosion after carbonization were employed to study durability resistance. The results indicated that for both PP fiber- and HPVA fiber-reinforced ECCs, the compressive strength first increases and then decreases as fiber content increases from 0 vol % to 2 vol %, reaching a maximum at 1 vol % fiber content. The bending strength, deformation capacity, and impact resistance show significant improvement with increasing fiber content. The ECC material reinforced with 2 vol % PP fiber shows superior carbonized durability with a maximum carbonation depth of only 0.8 mm.
在此，对工程水泥基复合材料（ECC）的力学性能和碳化耐久性进行了研究。为了经济高效地利用ECC材料，用聚丙烯（PP）纤维和亲水性聚乙烯醇（HPVA）纤维浇筑了不同类型的试件。通过压缩试验、四点弯曲试验、落锤试验和单轴拉伸试验，研究了纤维含量分别为0 vol%、1 vol%、1.5 vol%和2 vol%的两种ECC材料的抗压强度、泊松比、强度-挠度曲线、开裂/开裂后强度、冲击指数和拉伸应力-应变曲线。此外，通过扫描电子显微镜（SEM）分析研究了ECC材料中基体的微观结构和纤维的破坏形态。此外，采用碳化试验和碳化后钢腐蚀的表征来研究耐久性。结果表明，对于PP纤维增强和HPVA纤维增强的ECC，随着纤维含量从0 vol%增加到2 vol%，抗压强度先增加后降低，在纤维含量为1 vol%时达到最大值。随着纤维含量的增加，弯曲强度、变形能力和抗冲击性有显著提高。用2 vol% PP纤维增强的ECC材料具有优异的碳化耐久性，最大碳化深度仅为0.8 mm。
