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采用四点弯曲试验研究了不同腐蚀条件下钢纤维活性粉末混凝土的抗弯性能。结果显示,氯盐-冻融循环耦合作用对试件的抗弯强度腐蚀作用大于冻融循环单因素的腐蚀,氯盐-冻融耦合循环1500次后,试件的抗弯强度仅为标准养护的45.02%。由于活性粉末混凝土基体致密,腐蚀作用下,试件表面钢纤维锈蚀,但内部钢纤维仍能起到很好的限裂作用,基体开裂后仍能保持较好的持荷能力,抗弯试件的相对剩余强度都能达到80%以上。
The bending resistance of steel fiber reactive powder concrete under different corrosion conditions was studied by four-point bending test. The results show that the coupling effect of chloride-freeze-thaw cycles has a greater effect on the corrosion resistance of the specimen than that of the single-factor freeze-thaw cycle. The flexural strength of the specimen after the chloride-freeze-thaw coupling cycle is 1500 cycles is only the standard one Of 45.02%. Due to the dense matrix of the reactive powder concrete, the corrosion of the steel fiber on the surface of the specimen under the corrosive action, however, the internal steel fiber can still play a good limiting cracking effect, the substrate still maintains a good holding capacity after cracking, The relative residual strength can reach more than 80%.