冻融-氯盐耦合作用下活性粉末混凝土耐久性试验研究  

Experimental study on durability of reactive powder concrete under coupled effect of freeze-thaw and chloride penetration

作　　者：贾汝达[1] 付士健 JIA Ruda;FU Shijian(Zhejiang Industry Polytechnic College,Shaoxing 312069,China;Shuohuang Railway Huangda Railway Co Ltd.,Dongying 257029,China)

机构地区：[1]浙江工业职业技术学院,浙江绍兴312069 [2]朔黄铁路黄大铁路有限责任公司,山东东营257029

出　　处：《新型建筑材料》2019年第3期25-27,31,共4页New Building Materials

基　　金：浙江省建设科研项目(2013Z104)

摘　　要：通过试验研究了活性粉末混凝土(RPC)在冻融循环和氯盐侵蚀耦合作用下的质量损失率、相对动弹性模量、抗压强度和氯离子含量。结果表明,冻融循环和氯盐侵蚀耦合作用下,随着耦合次数的增大,RPC质量损失率迅速增加,相对动弹性模量、抗压强度迅速下降;随着扩散深度的增大,RPC氯离子含量逐渐下降;随着冻融循环次数的增加,RPC试件在不同深度处的氯离子含量逐渐增大。钢纤维的掺入有利于提高RPC抵抗耦合作用的能力,随着钢纤维掺量的增加,耦合作用后RPC质量损失率逐渐减小,相对动弹性模量降幅和抗压强度降幅均有所下降,抗氯离子渗透的性能增强。The mass loss ratio,relative dynamic modulus of elasticity,compressive strength and chloride ion distribution of reactive powder concrete(RPC) under coupled effect of freeze-thaw cycles and chloride penetration were studied by experiments. The results show that the mass loss ratio of RPC increases rapidly with the increase of coupling times,and the relative dynamic elastic modulus and compressive strength of RPC decrease rapidly under the coupled effect action of freeze-thaw cycle and chloride penetration. With the increase of diffusion depth,the chloride ion content of RPC decreases gradually;with the increase of freeze-thaw cycles,the chloride ion content of RPC specimens at different depths increases gradually. The incorporation of steel fibers is beneficial to improve the ability of RPC to resist coupling effect. With the increase of steel fiber content,the mass loss ratio of RPC decreases gradually,the relative dynamic modulus of elasticity and compressive strength decrease slightly,and the resistance of RPC to chloride ion penetration under coupling effect is enhanced.

关 键 词：冻融循环 氯盐侵蚀 耦合作用 RPC 氯离子分布 

分 类 号：TU528.31[建筑科学—建筑技术科学]