【摘要】 研究了用化学方法处理后的骨料表面与界面过渡区结构特征。结果表明 ,经酸处理可以使骨料表面洁净化、粗糙化、多孔化和提高表面反应活性 ,从而使界面结构向有利于改善混凝土性能的方向发展 ;经碱处理的骨料则使界面结构向不利的方向发展。用经酸预处理的骨料配制的混凝土 ,其界面过渡区的厚度明显缩小 ,密实度提高 ,水化产物趋于均匀 ,且其组分的梯度分布得到明显改善 ,从而可以有效的缓解界面应力。更多还原

【Abstract】 The surface feature of aggregate,which have been pretreated by chemical method,and the structure of interfacial zone between aggregate and cement paste are studied.The results show that,when the pretreatment is by using acids,it is able to make the surface clean,rough,porous and more active,so that the structure of interfacial zone is improved and that will increase the mechanical properties of concrete,but when the alkalies are used for pretreatment,the structure of interfacial zone will be deteriorated.For concrete made with acid-treated aggregate,the imterfacial zone become thinner and denser,in which the hydrated products is more uniform and its gradient distribution will obtain obvious improvement,so that the interfacial strss can be effectively released.更多还原