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本文研究了粉煤灰的掺量对C50钢纤维混凝土强度、渗透性、碳化等方面的影响以及钢纤维对大掺量粉煤灰混凝土的影响。结果表明,水泥掺量340kg/m3,粉煤灰掺量130kg/m3,钢纤维掺量60kg/m3,可配制出抗压强度为60MPa以上,抗折强度7MPa以上,耐久性良好的钢纤维混凝土;当钢纤维用量一定时,粉煤灰掺量的增加对28d抗压强度影响不大,而抗折强度略有降低;粉煤灰用量在一定范围内增加有利于改善钢纤维混凝土的微结构,使其后期强度和耐久性有一定的提高;大掺量粉煤灰混凝土中加入适量钢纤维可有效改善受弯构件的抗弯性能:推迟中和轴的上升,延缓裂缝的发展,提高极限承载力以及增加梁的刚度。
In this paper, the effect of fly ash content on the strength, permeability and carbonization of C50 steel fiber reinforced concrete and the influence of steel fiber on high volume fly ash concrete are studied. The results show that steel fiber reinforced concrete with compressive strength above 60MPa, flexural strength above 7MPa and good durability can be prepared with cement content 340kg / m3, fly ash dosage 130kg / m3 and steel fiber content 60kg / m3 ; When the amount of steel fiber is constant, the increase of fly ash content has little effect on 28d compressive strength, while the flexural strength slightly decreases; fly ash content increases within a certain range is conducive to improving the microstructure of steel fiber reinforced concrete , So that the latter part of the strength and durability of a certain increase; high volume fly ash concrete with an appropriate amount of steel fiber can effectively improve the flexural properties of flexural members: delaying the rise of neutral axis, delaying the development of cracks and raising the limit Bearing capacity and increase the rigidity of the beam.