废弃混凝土再生骨料表面改性的强化试验

The Intensive Test of Surface Modification of Waste Concrete Recycled Aggregate

为了提高再生骨料的利用率,突破其高吸水率和低强度等特点所存在的局限性,现使用硅酸钠溶液和硅烷溶液两种改性剂,并采用浸渍改性方法,对再生骨表面进行改性处理,并全面地分析和研究了改性剂浓度、处理时间等参数对改性处理后的再生骨料性能所产生的影响程度。结果表明:通过使用硅酸钠溶液和硅烷溶液两种改性剂,不仅可以确保再生骨料表现出较高的表观密度,还能将其吸水率和压碎指标降到最低。当硅酸钠溶液和硅烷溶液两种改性剂的浓度分别达到8%、10%时,可以获取最佳改性效果。同时,粒径为10~31.5 mm的再生骨料所获改性效果远远高于粒径为5~10 mm再生骨料。

In order to improve the utilization rate of recycled aggregate and break through the limitations of its high water absorption and low strength,now the surface of recycled aggregate is modified by using two modifiers,sodium silicate solution and silane solution and the impregnation modification method,and the influence of modifier concentration,treatment time and other parameters on the performance of recycled aggregate after modification is comprehensively analyzed and studied.Results show that the use of two modifiers,sodium silicate solution and silane solution not only can ensure that recycled aggregate exhibits a higher apparent density,but also minimize its water absorption and crushing index,the best modification effect can be obtained when the concentration of two modifiers of sodium silicate solution and silane solution reaches 8% and 10%,respectively,and at the same time,the modification effect of recycled aggregate with a particle size of 10~31.5 mm is much higher than that of recycled aggregate with a particle size of 5~10 mm.