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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。
The addition of rubber powder can improve the toughness of concrete. However, the adhesion between rubber powder and aggregate and cement binder is poor, and the improvement of toughness of concrete is limited. In order to maximize the toughness of rubber concrete, the surface of rubber particles must be treated deal with. In this paper, the effects of different rubber particles pretreatment methods on the toughness of concrete, such as tap water cleaning, Na_2CO_3 solution cleaning, methanol solution cleaning and low temperature plasma treatment, were studied through experiments. The mechanism of action of different treatment methods was also analyzed. The experimental results show that compared with tap water cleaning and cleaning rubber powder, Na_2CO_3 solution cleaning, methanol solution cleaning and low temperature plasma treatment can improve the microstructure of rubber particles and improve the toughness of rubber concrete effectively. After low temperature plasma treatment of rubber particles The flexural toughness of rubber concrete increases by the maximum, and the bending strain energy and impact strain energy corresponding to flexural toughness and impact toughness increase about 32.0% and 38.6% respectively. In addition, the concentration of the solution and the pretreatment time of the rubber particles also have an impact on the toughness of the rubber concrete. With the increase of the solution concentration and the pretreatment time of the rubber particles, the corresponding toughness of the rubber concrete will be Improve, but the effect is relatively limited.