摘要
研究了水泥-粉煤灰混合浆液的水胶比(0.5～1.0)、浸泡时间(2.0～4.0 h)对再生骨料性能的影响,优选出了最佳的包浆处理方式,在此基础上制备了自密实混凝土(SCC),研究了未包浆再生骨料和包浆再生骨料的掺量(0、30％、50％、100％)、废弃橡胶颗粒掺量(0、5％、10％)对SCC工作性、力学性能和抗氯离子渗透性能的影响.结果表明:当混合浆液的水胶比为0.7、浸泡时间为3.5 h时,包浆再生骨料的综合性能最优;未包浆再生骨料、包浆再生骨料的掺入基本降低了 SCC的工作性、28 d抗压强度、轴心抗压强度、劈裂抗拉强度、抗氯离子渗透性能,其中,包浆再生骨料对SCC性能的不利影响相对较小;废弃橡胶颗粒的掺入降低了 SCC的工作性、28 d抗压强度、轴心抗压强度、劈裂抗拉强度,但提高了抗氯离子渗透性能;建立的强度指标换算公式精度较高.
Abstract
The effects of water-binder ratio(0.5～1.0)of cement-fly ash mixed slurry and soaking time(2.0～4.0 h)on the properties of recycled aggregate were investigated,and the best wrapped slurry treatment was preferred.Based on this,self-compacting concrete(SCC)was prepared,and the effects of contents(0,30％,50％,100％)of unwrapped slurry recycled aggregate and wrapped slurry recycled aggregate,and content(0,5％,10％)of waste rubber particles on the workability,mechanical properties and chloride ion penetration resistance of SCC were investigated.The results show that,when the water-binder ratio of the mixed slurry is 0.7 and the soaking time is 3.5 h,the comprehensive performance of the wrapped slurry recycled aggregate is optimal.The incorporation of unwrapped slurry recycled aggregate and wrapped slurry recycled aggregate basically reduces the workability,28 d compressive strength,axial compressive strength,splitting tensile strength,and chlorine ion penetration resistance of SCC,among which,the adverse effect of wrapped slurry recycled aggregate on the performance of SCC is relatively small.The incorporation of waste rubber particles reduces the workability,28 d compressive strength,axial compressive strength,and splitting tensile strength of SCC,but improves the chlorine ion penetration resistance.The established conversion formulas for strength indexes are of high accuracy.
维普
万方数据