高延性纤维增强水泥基复合材料的直接拉伸性能  

Uniaxial Tensile Properties of Engineered Cementitious Composites

作　　者：李国友[1] 霍亮[1] 张涛[1] 智艳飞[1] 张起维 蔺喜强[1] 

机构地区：[1]中国建筑股份有限公司技术中心,北京101300

出　　处：《材料导报（纳米与新材料专辑）》2013年第1期298-301,共4页

基　　金：中国建筑股份有限公司技术中心青年创新基金

摘　　要：利用国产基体原材料制备了具有较高极限拉伸性能的高延性纤维增强水泥基复合材料(ECC),研究了粉煤灰和胶粉对ECC直接拉伸性能的影响。试验结果表明:采用合理的配合比及测试方法,制备的ECC试件具有应变硬化及多缝开裂特征;粉煤灰掺量为80%时,7d、28d极限拉应变分别达到3.77%和2.86%,28d抗压强度为25.4MPa;掺入10%胶粉,7d、28d极限拉应变分别达到3.91%和2.37%。在满足强度要求的前提下,适当增大粉煤灰和胶粉掺量有利于提高ECC的延性。Engineered cementitious composites （ECC） with the excellent uniaxial tensile properties was made of domestic raw materials（except PVA fiber）. The effect of content of fly ash and emulsion powders on the direct tensile properties was studied. The results showed that ECC which was produced by means of appropriately mixed-ratio and test method had strain-hardening and multiple-cracking characteristics obviously. When fly ash content reached 80%, the ultimate tensile strain of 7 d and 28 d reached 3.77% and 2. 86% respectively, 28 d compressive strength reached 25.4 MPa. When emulsion powders content reached 10%, the ultimate tensile strain of 7 d and 28 d reached 3.91% and 2.37% respectively. To increase fly ash content appropriately will help to further improve the toughness and duc- tility of ECC.

关 键 词：高延性纤维增强水泥基复合材料 粉煤灰 胶粉 直接拉伸试验 应变硬化 

分 类 号：TU528.2[建筑科学—建筑技术科学]