陶粒预湿程度对轻骨料混凝土自收缩的影响  

Effect of ceramsite prewetting degree on autogenous shrinkage of lightweight aggregate concrete

作　　者：陈永波[1] 季韬[1] 陈彩艺[1] 李锋[1] 梁咏宁[1] 林旭健[1] 

机构地区：[1]福州大学土木工程学院,福建福州350108

出　　处：《福州大学学报（自然科学版）》2011年第6期941-946,共6页Journal of Fuzhou University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51078090)

摘　　要：采用U型管微压测定装置测定不同预湿程度陶粒在陶粒混凝土中的吸水返水过程,用氮气吸附法测试陶粒混凝土中水泥石孔径分布情况,用测湿仪器监测陶粒混凝土内部湿度,用架立千分表的方法测试陶粒混凝土的自收缩.研究结果表明,随着陶粒预湿程度的提高,陶粒在陶粒混凝土中的吸水能力下降,返水能力提高,陶粒混凝土内部湿度下降幅度减小,陶粒混凝土产生的自收缩也减小.The water absorption and desorption process of different prewetting degree ceramsites embeded in ceramsite concrete was obtained by an U-shape tube micro pressure measurement device.The pore size distribution of hardened cement paste in ceramsite concrete was tested by a nitrogen adsorption method.The ceramsite concrete internal humidity was monitored by adopting a humidity measurement instrument.The autogenous shrinkage of ceramsite concrete was also tested by using an erecting dial indicator method.The study reveals that for the ceramsites embeded in ceramsite concrete,with the increase of ceramsite prewetting degree,the ability of water absorption declines and the ability of water desorption increases,and the internal humidity of ceramsite concretes declines,and the autogenous shrinkage of ceramsite concretes also decreases.

关 键 词：陶粒混凝土 吸水 返水 氮气吸附 内部湿度 自收缩 

分 类 号：TU528.2[建筑科学—建筑技术科学]