含钢渣的低熟料混凝土耐久性及水化机理研究  

Study on durability and hydration mechanism of low clinker concrete containing steel slag

作　　者：汪坤 李颖 张广田 WANG Kun;LI Ying;ZHANG Guang-tian(School of Civil and Resource Engineering,University of Science and Technology Beijing,Beijing 100083,China;Hebei Province Science and Technology Key Laboratory of Solid Waste Used to Building Materials,Hebei Academy of Building Research Co,Ltd.,Shijiazhuang 050021,Hebei,China)

机构地区：[1]北京科技大学土木与资源工程学院,北京100083 [2]河北省建筑科学研究院有限公司河北省固废建材化利用科学与技术重点实验室,河北石家庄050021

出　　处：《中国冶金》2020年第10期92-97,共6页China Metallurgy

基　　金：河北省重点研发计划项目资源与环境专项资助项目(20373801D)。

摘　　要：研究了不同钢渣掺量对C40低熟料胶凝材料混凝土的碳化、电通量、抗冻等耐久性的影响,结果表明,钢渣掺量为15%时,混凝土碳化深度最小,抗碳化等级为T-Ⅳ;抗氯离子渗透和抗冻性能在钢渣掺量为10%时最佳,分别达到Q-Ⅴ和F275等级。采用XRD、IR和SEM等手段分析了10%钢渣掺量的低熟料胶凝材料水化机理,结果表明,胶凝体系主要水化产物是水化硅酸钙(C-S-H)凝胶和钙矾石(AFt);水泥熟料和钢渣先后水化,产生的OH-维持体系的碱性环境,使矿渣中的硅(铝)氧四面体逐渐解离,在SO42-的共同作用下形成C-S-H凝胶和AFt;矿渣和钢渣的水化相互促进,使胶凝体系在后期仍然产生大量水化产物,为混凝土后期强度和密实度的提高起到了重要作用。The influences of different content of steel slag on carbonization, electric flux and frost resistance of C40 low clinker concrete were studied. The results showed that low clinker concrete had the minimum carbonation depth and the carbonation resistance level T-Ⅳ when the content of steel slag was 15%. The resistance of concrete to chloride penetration and freezing and thawing was best when the content of steel slag was 10%, reaching level Q-Ⅴ and F275, respectively. The hydration mechanism of low clinker cementitious material containing 10% steel slag was analyzed by means of XRD, IR and SEM. The results showed that the major hydration products were calcium silicate hydrate(C-S-H) gels and ettringite(AFt). The cement clinker and steel slag were hydrated successively, then the resulting OH- gradually dissociated the silicon(aluminum) oxygen tetrahedron in blast furnace slag, and C-S-H gels and AFt were formed under the combined action of SO42-. The hydration of blast furnace slag and steel slag promoted each other, so that the cementitious system still produced a large number of hydration products in the later period, which played an important role in improving the strength and compactness of concrete in the later period.

关 键 词：钢渣 低熟料胶凝材料 混凝土 耐久性 水化机理 

分 类 号：TU528[建筑科学—建筑技术科学]