低水灰比条件下水泥砂浆的抗硫酸盐侵蚀性能  

Resistance against sulfate attack of cement mortar with low water cement ratio

作　　者：张俊[1] 潘志华[1] 李洪马 郭书辉[1] 

机构地区：[1]南京工业大学材料科学与工程学院,江苏南京210009

出　　处：《混凝土》2014年第4期124-129,共6页Concrete

基　　金：国家973项目资助(2011CB013801)

摘　　要：硫酸盐侵蚀是混凝土耐久性研究的重要组成部分,被认为是引起混凝土材料失效破坏的主要因素之一。研究了低水灰比条件下掺有超细矿渣粉的水泥砂浆在不同种类和浓度的硫酸盐溶液中浸泡后的力学性能变化,同时,对侵蚀试样的孔结构进行了分析。试验结果表明:与普通水灰比相比,低水灰比条件下水泥砂浆的抗硫酸盐侵蚀性能改善更加显著;超细矿渣粉的引入不仅可以增加水泥砂浆的强度,而且可以改善其抗硫酸盐侵蚀性能;同时,矿渣粉掺加改变了水泥硬化体的孔隙率,水泥硬化体趋于致密化。Sulfate attack is comprises a very important part of the research of concrete durability, and is believed to be one of the main factors causing the degradation of concrete.Changes of the physical properties of cement mortars with low water cement ratio and those blended with ultrafine granulated blast-furnace slag exposed to different sulfate solution were investigated and reported here.Meanwhile, changes of the pore structures of those specimens were also analyzed.Results showed that the resistance against sulfate attack of the cement mortars with low water cement ratio was improved significantly as compared with those with normal water cement ratio;not only the strength of the cement mortar specimens blended with ultrafine granulated blast-furnace slag increased but also their resistance against sul- fate attack was improved as compared with those of Portland cement; And meanwhile, the total porosity of the mortar specimens blended with ultrafine slag powder was changed hence its microstructure tends to be denser.

关 键 词：超细矿渣粉 低水灰比 水泥砂浆 硫酸盐侵蚀 

分 类 号：TU528.062[建筑科学—建筑技术科学]