建筑垃圾再生骨料吸水性能改善试验研究

发布时间：2018-05-06 12:04

本文选题：建筑垃圾 + 再生骨料　；参考：《地下空间与工程学报》2017年04期

【摘要】：建筑垃圾再生骨料较高的吸水率限制了其广泛应用。对再生骨料进行表面改性,使其吸水率与天然材料接近,是提高建筑垃圾资源化利用的一条技术途径。以球磨微损破碎再生骨料为研究对象,采用稀盐酸浸泡、化学浆液和水玻璃溶液浸泡三种表面改性处理方法,结果表明:盐酸浓度为2%,浸泡时间为60 min,再生骨料吸水率为2.97%,较未处理的降低了24.6%;采用硅酸盐水泥浆+10%硅粉,水胶比为0.8,浸泡时间为5 min,再生骨料的吸水率为2.42%,较未处理的降低了38.6%;水玻璃溶液浓度为5%,浸泡时间为5 h,再生骨料吸水率为2.11%,较未处理的降低了46.4%。三种方法均能有效改善再生骨料吸水性能,综合考虑处理效率,采用硅酸盐水泥浆+10%硅粉处理效果最好。
[Abstract]:The high water absorption rate of recycled aggregate from construction waste limits its wide application. The surface modification of recycled aggregate to make its water absorption close to that of natural materials is a technical way to improve the utilization of construction waste. Three methods of surface modification were studied, such as marinating with dilute hydrochloric acid, chemical slurry and soaking in water glass solution. The results showed that the concentration of hydrochloric acid was 2, the soaking time was 60 min, the water absorption rate of regenerated aggregate was 2.97, and the water absorption rate of recycled aggregate was 24.60.The silicate cement slurry was used as 10% silica fume. The water / binder ratio was 0.8, the soaking time was 5 min, the water absorption rate of regenerated aggregate was 2.42, the water absorption rate of regenerated aggregate was lower than that of untreated aggregate, the water glass solution concentration was 5, the soaking time was 5 hours, and the water absorption rate of recycled aggregate was 2.11, which was 46.4 lower than that of untreated aggregate. The three methods can effectively improve the water absorbency of recycled aggregate. Considering the treatment efficiency, the silicate cement slurry with 10% silica fume has the best treatment effect.
【作者单位】：重庆大学三峡库区生态环境教育部重点实验室;
【基金】：重庆市科技攻关计划项目(CSTC2012GG-YYJSB20001)
【分类号】：TU528

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