马芹永1，*， 张阳阳2，
（ 1、安徽理工大学矿山地下工程教育部工程研究中心，安徽淮南 232001； 2、安徽理工大学矿山地下工程教育部工程研究中心，安徽淮南232001； ）
摘要： 为研究干拌混合料贮存期对预拌补偿收缩混凝土微观结构的影响，当膨胀剂掺量为6%，砂子含水率为1.0%时，对6种贮存期（3d、7d、10d、15d、20d和30d）的预拌补偿收缩混凝土进行微观结构试验。结果表明：当干拌混合料贮存期为3d、7d和10d时，混凝土中存在大量C-S-H凝胶和针棒状AFt晶体，密实性较好，随着贮存期的增加，水泥石结构中孔洞直径分别为3.075μm、3.979μm和5.885μm，微裂缝宽度分别为0.364μm、0.450μm和0.703μm，界面过渡区中的粘结裂缝宽度分别为0.554μm、0.949μm和1.280μm。当贮存期为15d、20d和30d时，水泥石结构中孔洞直径分别为6.137μm、6.335μm和7.033μm，微裂缝宽度分别为1.230μm、1.352μm和1.370μm，变化幅度很大，界面过渡区中的粘结裂缝宽度变化不大，取向排列的Ca(OH)2晶体增多，C-S-H凝胶数量相对减少，混凝土密集度下降，其附近结构中有新微裂缝的存在，且微裂缝尺寸随着贮存期的增加而不断增大。
关键词： 补偿收缩混凝土；干拌混合料；贮存期；微观结构；界面过渡区
MA Qinyong1,*， ZHANG Yangyang2,
（ 1、Underground Engineering Research Center for Ministry of Education,Anhui University of Science and Technology,Huainan,Anhui 232001,China； 2、Underground Engineering Research Center for Ministry of Education,Anhui University of Science and Technology ,Huainan,Anhui 232001,China； ）
Abstract： In order to study the effect of the storage period for dry-mixed materials on the microstructure of the ready-mixed shrinkage-compensating concrete, microstructure test with respect to six different kinds of storage periods (3d, 7d, 10d, 15d, 20d and 30d), while with the constant expansive agent dosage of 6% and sand moisture content of 1.0%, was carried out. The results show that when the storage period of the dry-mixed materials is 3d,7d or 10d ,there exsits mass of C-S-H gel and AFt crystal， with the increasing storage period, the diameter of holes are 3.075μm,3.979μm and 5.885μm,the breadth of micro cracks are 0.364μm,0.450μm and 0.703μm , the breadth of micro cracks in the transition zone are 0.554μm,0.949μm and1.280μm. When the storage period of the dry-mixed materials is 15d,20d or 30d, the diameter of holes are 6.137μm,6.335μm and 7.033μm, the breadth of micro cracks are 1.230μm,1.352μm and 1.370μm, the increase amplitude is big, while the bond crack in the transition zone experiences little change, The Ca(OH)2 crystals in the oriented arrangement increase, while the C-S-H gel quantity decreases gradually. The intensity of concrete shows a decreasing trend, while there exists new micro cracks nearby the transition zone of the interface, and the size of the micro cracks increases gradually with the increasing storage period.
Keywords： shrinkage-compensating concrete;dry-mixed materials;storage periods;microstructure;
作者简介： 马芹永（1964-），男，教授，主要研究方向：混凝土结构与材料
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