蒸养纤维掺杂高铁低钙水泥混凝土的抗海水冲磨性能研究

Abrasion Resistance Performance to Seawater of Steamed Fiber-doped High-ferrite Low-calcium Cement Concrete

针对目前海工混凝土普遍存在的抗冲磨性能不足的问题,鉴于铁相含量高的水泥耐磨性能好的优点,提出高铁低钙水泥混凝土(C3S≤50%,C4AF≥18%),并研究了纤维种类及掺量、蒸汽养护对其力学性能及抗冲磨性能的影响以期进一步提升海工混凝土的耐磨性能。研究表明,PVA纤维混凝土的抗压强度和抗冲磨强度最优,与水泥浆体结合最好。PVA体积掺量为0.1%的高铁低钙水泥混凝土抗冲磨强度较对照组强度提高了28.0%。同时,讨论了70℃蒸养对各组试件抗压强度与抗冲磨性能的影响,结果表明,蒸养明显提高了各试件的早期强度,但蒸养条件下高铁低钙水泥混凝土的抗冲磨强度较普通混凝土略为降低,这说明蒸养制度对高铁低钙水泥混凝土较为不利。

In view of the current problem of insufficient abrasion resistance performance in marine concrete and the advantages of high abrasion resistance of cement with high ferrite content,high-ferrite low-calcium cement concrete(C3S≤50%,C4AF≥18%)was proposed and the effects of fiber type and content,steam curing on the mechanical properties and abrasion resistance of high-ferrite low-calcium concrete were studied in order to further improve the abrasion resistance of marine concrete.The results show that PVA fiber concrete has the best compressive strength and abrasion resistance strength,and is best combined with cement paste.The abrasion resistance strength of high-ferrite low-calcium concrete with PVA fiber of volume content of 0.1%is increased by 28.0%compared with the control group.At the same time,the effects of steaming at 70℃on the compressive strength and abrasion resistance performance of each group of specimens were discussed.The results show that steaming significantly improves the early strength of each specimen.However,the abrasion resistance strength of high-ferrite low-calcium cement concrete under steaming conditions is slightly lower than that of ordinary concrete,which indicates that the steaming system is more disadvantageous to high-ferrite low-calcium cement concrete.