碱矿渣水泥基材料的干燥收缩及减缩技术研究进展

Research Progress of Drying Shrinkage of Alkali Activated Slag Cement Based Materials and Corresponding Counter-techniques

碱矿渣(AAS)水泥是以矿渣为原料在激发剂作用下形成的具有高强、高耐久性、环保的胶凝材料,被认为是普通硅酸盐水泥的潜在替代品,但其较大的干燥收缩是制约其应用和推广的主要原因。如何通过合理有效的减缩技术将AAS水泥基材料的干燥收缩控制在合理范围内,是实际工程应用中需要解决的问题。本文系统地回顾了国内外学者关于减轻AAS水泥基材料干燥收缩技术的研究现状。然后,综述了纤维,外加剂,激发剂种类、掺量和模数,矿物掺合料,养护条件和内养护等对AAS水泥基材料干燥收缩的减缩效果。最后,提出了目前对AAS水泥基材料减缩研究中存在的不足以及后续的研究方向。

Alkali-activated slag(AAS)cement is environment-friendly cementitious material with high strength and high durability made of slag activated by alkali activators.It is considered to be a potential substitute for ordinary portland cement,but its wider utilization is limited by significant drying shrinkage.How to control the drying shrinkage of AAS cement-based materials within a reasonable range through reasonable and effective shrinkage reduction approaches is a problem to be solved in practical engineering application.In this paper,the research status of reducing the drying shrinkage of AAS cement-based materials at home and abroad are systematically reviewed.And the shrinkage reduction effects of fibers,admixtures,activator types,dosage and modulus,mineral admixtures,curing conditions and internal curing on the drying shrinkage of AAS cement-based materials are summarized.Finally,the limitations in the shrinkage reduction research of AAS cement-based materials and suggestions as well as perspectives for the future are provided.