聚丙烯纤维轻骨料混凝土抗冻耐久性试验研究  

THE EXPERIMENT STUDY ON FROST RESISTANCE DURABILITY OF POLYPROPYLENE FIBER REINFORCED LIGHTWEIGHT AGGREGATE CONCRETE

作　　者：霍俊芳[1] 申向东[2] 

机构地区：[1]内蒙古工业大学,呼和浩特010051 [2]内蒙古农业大学,呼和浩特010018

出　　处：《工业建筑》2009年第3期86-89,共4页Industrial Construction

基　　金：内蒙古自然科学基金资助项目(200711020715);"十一"五国家科技支撑计划课题(2006BAJ05B06-06)

摘　　要：通过掺入聚丙烯纤维、高效减水剂、引气剂及矿物掺合料,配制两种强度等级(LC30,LC35)的浮石轻骨料混凝土。对比盐溶液(5%Na2SO4)和水中抗冻性试验发现,盐溶液中冻融的轻骨料混凝土劣化程度大于水中。轻骨料混凝土掺入纤维后,其抵抗冻融损伤能力得到改善,掺量越高,对轻骨料性能的改善作用越明显。SEM观察发现,随着盐溶液的侵蚀以及冻融循环次数的增加,水化产物的结构由密实逐渐变得疏松;聚丙烯纤维与水泥石浆体的粘结力强,能够抑制混凝土的冻融损伤。Pumice lightweight aggregate concrete （LWAC） of LC30, LC35 is prepared with the method of mixing polypropylene fiber, superplasticizer, air-entraining agent and mineral admixtures. Comparing frost resistance durability of LWAC in salt solution （5 % Na2 SO4 ） and in water, the degree of LWAC durability deterioration is： freezing-thawing in salt solution 〉 freezing-thawing in water. The frost resistance of LWAC is improved by mixing polypropylene fiber. The large volume fraction has tendency of good frost resistance of LWAC. SEM shows that hydrate structure in interfacial transition zone （ITZ） becomes loose gradually with an increase in cycles of freezing-thawing and corrosion. Polypropylene fiber has stronger cementing bond with paste and can restraint the damage to concrete by freezing-thawing.

关 键 词：浮石 聚丙烯纤维 轻骨料混凝土 抗冻性 微观结构 

分 类 号：TU528.041[建筑科学—建筑技术科学]