混杂纤维混凝土力学性能试验研究与分析

Experimental Study and Analysis of Layer Hybrid Fiber Reinforced Concrete Mechanical Performance

研究了素混凝土、粉煤灰混凝土、层布式混杂纤维混凝土及混杂纤维混凝土在14d、28 d、56 d的抗压强度和劈裂强度。结果表明:粉煤灰会降低混凝土的早期强度但能增加混凝土的和易性,掺30%粉煤灰的聚丙烯纤维混凝土在28 d的抗压强度比素混凝土降低了10%,劈裂强度提高了3%。掺30%粉煤灰的混杂纤维混凝土在28 d的抗压强度比素混凝土提高了4%,劈裂强度提高了10%。聚丙烯纤维和钢纤维的加入可以明显改善混凝土的脆性,提高混凝土的劈裂强度,若两种纤维混杂掺加改善混凝土脆性效果更明显。

The compressive strength and the cleavage strength of the plain concrete, fly ash concrete, polypropylene fiber reinforced concrete, layer hybrid fiber reinforced concrete and hybrid fiber concrete at 14d, 28d and 56d were studied. The results show that the fly ash can reduce the early strength of the concrete and be able to increase the workability. Mixed with 30% of fly ash, the compressire strength of polypropylene fiber reinforced concrete reduced by 10% at 28d in comparison with that of plain concrete and the cleavage strength enhanced by 3%. Mixed with 30% of fly ash, the compressire strength of hybrid fiber concrete enhanced by 4% at 28d and the cleavage strength enhanced by 10%. Polypropylene fiber and steel fiber can significantly improve the brittleness of concrete and improve concrete splitting strength, if the two kinds of fiber are added together the improvement of concrete brittleness is more effective.