再生骨料强化作用的机理试验研究与分析

发布时间：2018-07-12 20:48

本文选题：再生骨料 + 渗透结晶材料　；参考：《混凝土》2017年12期

【摘要】：研究了再生骨料经渗透结晶材料处理后力学性能增强的作用机理。通过力学性能指标的测试和电镜扫描的观察和对比,结果表明:宏观方面,经过渗透结晶材料处理的再生骨料,其孔隙率、吸水率明显下降,压碎指标有所降低,总体力学性能指标远高于普通再生骨料,且比较接近于天然骨料。微观方面,采用扫描电镜(SEM),对强化后再生骨料、天然骨料以及未经处理再生骨料进行研究,可见到使用渗透结晶材料处理后的再生骨料表面大部分裂缝被填充,且明显发现骨料结构组织呈现密实状态,结论是:再生骨料性能大幅度提升的原因,是渗透结晶材料溶液在再生骨料表面覆盖的砂浆层实施了有效的渗透,骨料自身裂缝被填充,结构变得更加密实,因此提高了再生骨料的力学性能;同时渗透结晶作用不限于最初的结晶过程,有进一步发展的趋势。从而揭示了渗透结晶材料能够增强再生骨料力学性能的作用机理。
[Abstract]:The mechanism of mechanical properties enhancement of recycled aggregate treated with permeable crystalline material was studied. The results show that the porosity, water absorption and crushing index of recycled aggregate treated with permeable crystalline material are obviously decreased, and the crushing index is decreased in macroscopic aspect through the testing of mechanical properties and the observation and comparison of scanning electron microscope (SEM), and the results show that the porosity and water absorption of recycled aggregate treated with permeable crystalline materials are obviously decreased. The total mechanical properties are much higher than that of ordinary recycled aggregate, and are close to natural aggregate. Microscopically, the reinforced recycled aggregate, natural aggregate and untreated recycled aggregate were studied by scanning electron microscope (SEM). It was found that most of the cracks on the surface of recycled aggregate treated with osmotic crystalline material were filled. It is found that the structure of aggregate is dense. The reason for the improvement of the properties of recycled aggregate is the effective permeation of the permeable crystalline material solution into the mortar layer covered on the surface of recycled aggregate. The cracks of the aggregate are filled in and the structure becomes more dense, so the mechanical properties of the recycled aggregate are improved. At the same time, the effect of permeation and crystallization is not limited to the initial crystallization process and has a trend of further development. The mechanism of the effect of osmotic crystallization material on the mechanical properties of recycled aggregate was revealed.
【作者单位】：山东科技大学土木工程与建筑学院;青岛工学院建筑工程学院;
【基金】：青岛市建设事业科技发展项目(JK2015-9) 青岛工学院校长基金项目(2015KY011)
【分类号】：TU528.041

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