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本文通过对快硬硫铝酸盐水泥硬化浆体微观结构的观察,探讨了快硬硫铝酸盐水泥抗折强度倒缩的机理。结果表明,所谓的快硬硫铝酸盐水泥强度倒缩,一般应专指抗折强度的倒缩,且在特定龄期的特殊表现;其根本原因是硬化本体结构微裂纹的出现、变宽和连通导致的硬化浆体结构的劣化。提出了相应的解决措施。
In this paper, through observation of the microstructure of hardened slurry of fast hardened sulphoaluminate cement, the mechanism of flexural strength reduction of fast hardened sulphoaluminate cement was discussed. The results show that the so-called strength hardening of quick-hardening sulphoaluminate cement should generally be directed to the reduction of flexural strength and its special behavior at a given age. The fundamental reason for this is the appearance and broadening of micro-cracks in the hardening bulk structure And the deterioration of the hardened paste structure caused by the communication. Put forward the corresponding solutions.