外加剂及矿物细掺料对自密实混凝土耐久性的影响  

IMPACT OF ADDITIVE AND FINE MINERAL ADMIXTURE ON DURABILITY OF SELFCOMPACTING CONCRETE

作　　者：缪汉良[1] 杜艳静[1] 朱国平[1] 叶燕华[1] 

机构地区：[1]南京工业大学土木工程学院,南京210009

出　　处：《建筑技术》2009年第1期74-77,共4页Architecture Technology

基　　金：江苏省自然科学基金项目(BK2006179)

摘　　要：自密实混凝土由于较低的水胶比和外加剂、矿物细掺料的掺入使其具有良好的施工性能和填充性能,并在硬化后具有良好的力学性能。但与此同时,也使得自密实混凝土的自收缩变得不容忽视,成为产生裂缝的主要原因之一,严重影响到自密实混凝土的耐久性。因此常需要在自密实混凝土中掺入一定量的膨胀剂,以起到补偿收缩的作用。本文对外加剂中的高效减水剂、矿物细掺料中的粉煤灰以及膨胀剂在自密实混凝土中所起的作用进行了探讨。Due to its low water-to-cementitious materials ratio and application of additive, fine mineral admixtures, self-compacting concrete has favorable workability and filling property, as well as favorable mechanical property after setting. Meanwhile, self-shrinkage of self-compacting concrete becomes non-neglectable and is one of the major factors causing crack, having a strong impact on durability of self-compacting concrete. Therefore, certain amount of expansive agent shall be added into the self-compacting concrete for compensation of shrinkage. Effects of high efficiency water-reducing agent, fly ash of fine mineral admixture and expansive agent in self-compacting concrete are discussed herein.

关 键 词：自密实混凝土 高效减水剂 粉煤灰 膨胀剂 耐久性 

分 类 号：TU528[建筑科学—建筑技术科学]