多因素作用下钢纤维自密实混凝土的中性化研究

摘要

The neutralization of steel fiber reinforced self-compacting concrete under loads subjected to the simultaneous attack of carbonization,acid rain,acid rain and carbonization working together is investigated by laboratory test.The influence of stress level and steel fiber content on neutralization of steel fiber reinforced self-compacting concrete is analyzed.It is found that the bending tensile stress accelerated the neutralization.The higher the stress level,the more serious the concrete corrosion.In contrast,the bending compressive stress slows down the neutralization.The results indicate that the neutralization depth of steel fiber reinforced self-compacting concrete decreases as the steel fiber content increases in a certain range.From the test data,it can be concluded that the coupling effect of carbonization and acid rain working together on the neutralization of steel fiber reinforced self-compacting concrete is produced,but the stress level and the steel fiber content on coupling effect have no significant influence.%通过对承载钢纤维自密实混凝土在CO2、酸雨、CO2和酸雨共同作用下的中性化试验,研究分析了钢纤维自密实混凝土所承受的应力水平和钢纤维掺量对中性化的影响规律.试验研究表明,弯曲拉应力加速了钢纤维自密实混凝土的中性化,应力水平越高,加速作用越明显;而弯曲压应力对钢纤维自密实混凝土的中性化有减缓作用;在一定范围内,钢纤维掺量越大,自密实混凝土中性化深度越小;CO2与酸雨的共同作用对钢纤维自密实混凝土中性化存在着一定的耦合效应,但应力水平和钢纤维掺量对耦合效应均无显著影响.