开放系统下纤维轻骨料混凝土的冻胀性能  

Heaving of Lightweight Aggregate Concrete in Open System

作　　者：王海龙[1] 申向东[1] 

机构地区：[1]内蒙古农业大学水利与土木建筑工程学院,内蒙古呼和浩特010018

出　　处：《建筑材料学报》2010年第2期232-236,共5页Journal of Building Materials

基　　金：国家自然科学基金资助项目(10762002);内蒙古自然科学基金资助项目(20080404ms0307);内蒙古自治区高等学校科学研究重点项目(NJ09046)

摘　　要：通过纤维轻骨料混凝土试件开放系统下的冻胀性能试验,研究了纤维轻骨料混凝土冻胀量的发育情况,分析了纤维轻骨料混凝土在冻结过程中温度变化特点及影响纤维轻骨料混凝土冻胀变化的原因.在模拟北方室外多次骤然降温后纤维轻骨料混凝土的性能后发现,纤维在轻骨料混凝土经历多次骤然降温后对冻胀有抑制作用,并确定纤维掺量为0.9 kg/m3时轻骨料混凝土抵抗骤然降温的能力较强;从微观角度探讨了冻结过程中纤维表面及纤维与浆体界面的黏结情况.Natural pumice from the eastern Inner Mongolia was used as coarse aggregate for lightweight aggregate concrete.Through rapid freeze-thaw cycle experiment on lightweight aggregate concrete samples in an open system,the factors influencing heaving of the fiber reinforced concrete material were investigated and the characteristics of temperature change during freeze-thaw and the factors influencing heaving change of fiber reinforced concrete was analyzed.The freeze-thaw property subject to sudden temperature drop in northern China was simulated to show the suppression of heaving of lightweight aggregate concrete by fiber.Polypropylene fiber can restrain the freeze-thaw damage effectively.Test results show that frost-resisting properties are the best when mixed with 0.9 kg/m^3 of fiber.

关 键 词：轻骨料纤维混凝土 冻融循环 开放系统 冻胀量 

分 类 号：TU528.572[建筑科学—建筑技术科学]