碳纤维含量对水泥砂浆热膨胀系数的影响  

Effect of Fiber Content on Thermal Expansion Coefficient of Carbon Fiber Reinforced Mortar(CFRM)

作　　者：海然[1] 祝彦知[1] 吴科如[2] 

机构地区：[1]中原工学院土木建筑工程系,河南郑州450007 [2]同济大学先进土木工程材料教育部重点实验室,上海200092

出　　处：《建筑材料学报》2009年第2期232-235,共4页Journal of Building Materials

基　　金：国家自然科学基金资助项目(50272061)

摘　　要：研究了纤维含量对碳纤维水泥砂浆(CFRM)热膨胀系数的影响.结果表明:CFRM受热变形时,碳纤维热缩冷胀的特性约束了水泥砂浆基体的热胀冷缩;CFRM的热膨胀系数随着碳纤维含量的增加而降低,当碳纤维含量小于1.4%(质量分数,下同)时,其降幅较大,当碳纤维含量大于1.4%之后则降幅减小;通过对CFRM热膨胀系数的回归分析,得到了热膨胀系数与碳纤维含量的函数关系,为碳纤维水泥基材料热应力场的分析计算提供了理论基础.理论分析表明,热膨胀系数实测值与理论计算值有很好的一致性.The effect of fiber content on thermal expansion coefficient of carbon fiber reinforced mortar（CFRM） was investigated.Results show that thermal expansion coefficient of CFRM reduces with increasing carbon fiber（CF） content because CF＇s shrinkage in mortar can restrain the CFRM expansion with increasing temperature.When CF content is less than 1.4%（by mass）,the reduction of thermal expansion coefficient is bigger.Compared with control mortar,the thermal expansion coefficient reduces by（21.611 7%） when CF content is 1.4% and reduces by 24.523 4% when CF content is 2.0%.The functional relationship between thermal expansion coefficient and CF content is obtained by regression analysis,which provides the parameter basis for study on thermal stress profile of CFRM.It is shown that the experimental value and theoretical value have a good consistency.

关 键 词：碳纤维 水泥砂浆 热膨胀系数 实测值 理论计算值 

分 类 号：TU528.582[建筑科学—建筑技术科学]