摘要
硫酸盐侵蚀是影响混凝土耐久性的重要因素之一,对于海港或地下构筑物水泥混凝土的抗硫酸盐侵蚀能力尤其受到关注。在试验室条件下研究了超细矿渣粉取代量为0(即参比样)、15%、25%水泥制成的水泥砂浆在不同浓度硫酸盐介质环境下的力学性能变化,同时,借助于XRD对侵蚀试样的成分进行了分析。试验结果表明,15%和25%的超细矿渣粉的引入不仅可以增加水泥砂浆的强度,而且可以提高其抗硫酸盐侵蚀性能;与参比样相比,掺有超细矿渣粉的水泥砂浆试样内部Ca(OH)2的量和钙矾石的量明显减少,暗示超细矿渣粉与水泥水化放出的Ca(OH)2发生了化学反应。
Sulfate attack is one of the most important factors influencing the durability of cement concrete.It was especially taken attention while cement concrete was used for constructions under sea water or underground.Change of the physical properties of the cement mortars prepared from Portland cement and those blended with 15% and 25% ultrafine granulated blast-furnace slag exposed to different sulfate solution environment was investigated, and meanwhile, the composition of the exposed cement mortar specimens was also examined by means of XRD analysis.Results showed that not only the strength of the mortar specimens blended with 15% and 25% ultrafine granulated blast-furnace slag increased but also their resistance against sulfate attack was improved as compared with those of Portland ce ment.XRD analysis revealed that formation of Ca（ OH）2 and ettringite in hardened cement mortar specimens with slag addition was found obviously reduced as compared with that of Portland cement, which suggested chemical reactions between slag and Ca（ OH ）2 had taken place during the hydration process of cement.
出处
《混凝土》
CAS
CSCD
北大核心
2013年第5期127-129,共3页
Concrete
基金
973项目资助(2011CB013801)
关键词
超细矿渣粉
水泥砂浆
硫酸盐侵蚀
抗蚀系数
ultrafine slag
cement mortar
sulfate attack
corrosion resistance coefficient
