不同类型溶液对再生混凝土粗骨料的改性研究
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摘要
分别利用硅烷溶液、聚乙烯醇(PVA)和水玻璃3种溶液作为化学改性剂,通过采用化学试剂浸泡法对再生混凝土粗骨料(RCA)进行了改性研究,考察了3种不同类型的溶液对RCA吸水率、RCA的压碎指标值等性能指标的影响。并且,还对3种改性剂的浸泡时间及浓度进行了最优化处理。实验结果表明,经过3种溶液的改性后,RCA的各项基本性能指标均有所改善,其中,对三者各自的溶液浓度及浸泡时间综合考察认为,在PVA溶液浓度为9%,浸泡28 h时,较另两类溶液改性情况而言能达到更好的效果。
Respectively using silane solution,polyvinyl alcohol (PVA) and three kinds of sodium silicate solution as a chemical modifier,by adopting chemical reagent soaking method of recycled concrete aggregate (RCA) studied the modification,looked at the three different types of solution of RCA water absorption,RCA crushing index value and other performance indicators. And, soaking time and concentration of three kinds of modifier on the optimization process. The experimental results show that after modification of the three solution,the basic performance index of RCA was improved,among them,three of their respective solution concentration and immersion time in the comprehensive survey,the PVA concentration was 9%,for 28h,than the other two kinds of solution modified case can achieve the modification effect better.
Respectively using silane solution,polyvinyl alcohol (PVA) and three kinds of sodium silicate solution as a chemical modifier,by adopting chemical reagent soaking method of recycled concrete aggregate (RCA) studied the modification,looked at the three different types of solution of RCA water absorption,RCA crushing index value and other performance indicators. And, soaking time and concentration of three kinds of modifier on the optimization process. The experimental results show that after modification of the three solution,the basic performance index of RCA was improved,among them,three of their respective solution concentration and immersion time in the comprehensive survey,the PVA concentration was 9%,for 28h,than the other two kinds of solution modified case can achieve the modification effect better.
引文
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[2]水中和,邱晨,赵正齐,等.再生混凝土骨料含水状态与新拌混凝土的性能[J].国外建材科技,2003,(05):1-2.
[3]李文贵,龙初,罗智予,等.再生骨料混凝土破坏机理与改性研究综述[J].建筑科学与工程学报,2016,33(06):60-72.
[4]王江浩,耿欧,李富民.再生粗骨料多种改性方法对混凝土抗压强度提升效果的试验[J].建筑科学与工程学报,2016,33(02):91-97.
[5]杨飞华,郝利炜,程海丽.水玻璃改性废混凝土再生粗骨料对混凝土强度及抗冻性影响试验研究[J].江西建材,2015,(12):43-45.
[6]朱勇年,张鸿儒,孟涛,等.纳米Si O2改性再生骨料混凝土工程应用研究及实体性能监测[J].混凝土,2014,(07):138-144.
[7]巴明芳,柳俊哲,贺智敏,等.钢渣微粉改性水泥基钢渣骨料混凝土的配制及性能[J].材料导报,2013,27(22):119-124.
[8]万惠文,周绍豪,任峰.羧基丁苯对含橡胶粒的轻骨料混凝土改性研究[J].武汉理工大学学报,2008,(06):29-32.
[9]冯玉龙,陆小华,熊光晶,等.SCA改性骨料混凝土的抗压强度正交试验研究[J].建筑技术开发,2007,(10):30-31+72.
[10]孙立国.三级配(全级配)混凝土骨料形状数值模拟及其应用[D].河海大学,2005.