胶粉预处理方式对橡胶混凝土韧性的影响及作用机理研究

发布时间：2018-07-28 10:38

【摘要】：橡胶粉的加入能改善混凝土的韧性,然而橡胶粉与骨料、水泥结合料的粘结性较差,对混凝土韧性的改善程度有限,为了最大限度提高橡胶混凝土的韧性,必须对橡胶颗粒表面进行处理。该文通过试验对比研究了自来水清洗、Na_2CO_3溶液清洗、甲醇溶液清洗和低温等离子处理等不同橡胶颗粒预处理方式对混凝土韧性的影响规律,并分析了不同处理方式的作用机理。试验结果表明:与自来水浸泡清洗橡胶粉相比,Na_2CO_3溶液清洗、甲醇溶液清洗、低温等离子处理均能改善橡胶颗粒表面的微观形态,有效提高橡胶混凝土的韧性,其中,低温等离子处理橡胶颗粒后的橡胶混凝土韧性提升幅度最大,弯曲韧性和抗冲击韧性对应的弯曲应变能和抗冲击应变能分别增大约32.0%、38.6%。除此之外,溶液浓度及对橡胶颗粒的预处理时间也对橡胶混凝土的韧性产生一定影响,随着溶液浓度的增大,橡胶颗粒预处理时间的延长,对应的橡胶混凝土的韧性会有所改善,但效果相对有限。
[Abstract]:The addition of rubber powder can improve the toughness of concrete. However, the adhesion of rubber powder to aggregate and cement binder is poor, and the improvement degree of concrete toughness is limited. In order to maximize the toughness of rubber concrete, Rubber particle surfaces must be treated. The effects of different rubber particle pretreatment methods, such as water cleaning, Na2CO3 solution cleaning, methanol solution cleaning and low temperature plasma treatment, on the toughness of concrete are studied in this paper. The mechanism of different treatment methods is also analyzed. The results show that compared with soaking and cleaning rubber powder in tap water, Na2COCO3 solution cleaning, methanol solution cleaning and low temperature plasma treatment can improve the microstructure of rubber particle surface and improve the toughness of rubber concrete. The toughness of rubber concrete treated by low temperature plasma treatment is the largest. The bending strain energy and impact resistance strain energy of flexural toughness and impact toughness increase about 32.0 ~ 38.6 respectively. In addition, the concentration of solution and the pretreatment time of rubber particles also have a certain impact on the toughness of rubber concrete. With the increase of solution concentration, the pretreatment time of rubber particles is prolonged. The toughness of the corresponding rubber concrete will be improved, but the effect is relatively limited.
【作者单位】：内蒙古交通职业技术学院;
【基金】：中央支持职业教育实训基地建设项目(编号:15103991810)
【分类号】：U414

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