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试验通过平板约束试验研究粉煤灰混凝土、聚丙烯纤维混凝土、层布式钢纤维混凝土、层布式混杂纤维混凝土的早期抗裂性能,结果表明:聚丙烯纤维混凝土的最大裂缝宽度比粉煤灰混凝土减小了40%,裂缝总长度减小了25.55%,裂缝降低系数为56.56%,抗裂等级达到二级;层布式钢纤维混凝土的最大裂缝宽度比粉煤灰混凝土减小了26.7%,裂缝总长度减小了26.5%,裂缝降低系数为43.24%,抗裂等级达到三级;层布式混杂纤维混凝土的最大裂缝宽度比粉煤灰混凝土减小了67.69%,裂缝总长度减小了78.26%,裂缝降低系数为93.07%,抗裂等级达到一级。层布式混杂纤维混凝土的抗裂效果最好。
Experimental study on the early crack resistance of fly-ash concrete, polypropylene fiber concrete, layered steel fiber reinforced concrete and layered hybrid fiber reinforced concrete by plate restraint test showed that the maximum crack width of polypropylene fiber reinforced concrete was higher than that of fly ash The concrete reduced by 40%, the total crack length decreased by 25.55%, the crack reduction coefficient was 56.56% and the crack resistance grade reached grade 2. The maximum crack width of the layered steel fiber reinforced concrete was reduced by 26.7% , The total crack length decreased by 26.5%, the crack reduction coefficient was 43.24%, and the crack resistance grade reached level 3. The maximum crack width of the layered hybrid fiber reinforced concrete was reduced by 67.69% and the total crack length was reduced 78.26%, crack reduction coefficient of 93.07%, anti-cracking grade reached a level. Layered hybrid fiber reinforced concrete cracking the best.