碱-矿渣水泥的水化、力学及干缩性能研究进展

Research Progress of Hydration,Mechanical and Dry Shrinkage Properties of Alkali-Activated Slag Cement

碱-矿渣水泥是一种优良的绿色胶凝材料,由矿渣部分或全部取代水泥而制成。在碱激发剂的作用下矿渣水化产生活性,并且由于其独特的玻璃体分相结构导致碱-矿渣水泥的水化硬化产物表现出不同于普通硅酸盐水泥基材料的性能。本文介绍了矿渣的组成与结构,从理论层面解释碱-矿渣水泥具有潜在活性的原因,探讨了不同激发剂作用下碱-矿渣水泥的水化机理,并在此基础上综述其基本力学性能和干缩特性,为其在工程实践中的应用和推广提供依据。结合相关文献,总结了现有研究的不足并对今后的发展提出了建议。

Alkali-activated slag cement is an excellent green cementitious material,which is made of partial or total substitution of slag for cement.Under the action of alkali activator,slag hydration produces activity.Alkali-activated slag cement has different hydration mechanisms from ordinary Portland cement under the action of activator because of vitreous phase separation structure of slag,leading to unique mechanical and dry shrinkage characteristics.The composition and structure of slag were introduced in the article,the hydration mechanism of alkali-activated slag cement under the action of sodium hydroxide and sodium silicate respectively was summarized,its basic mechanical properties and dry shrinkage characteristics were discussed,and common methods of fiber shrinkage reduction were listed,which provide a basis for its application and promotion in engineering practice.The shortcomings of existing studies were summarized,and suggestions for future development were given.