胶粉对混凝土韧塑性的影响研究

Study on influence of rubber powder upon toughness and plasticity of concrete

介绍经2种不同改性剂改性的废橡胶粉对混凝土抗压和抗折强度以及塑性、韧性的影响,并配合微观电镜照片对其影响机理进行了初步的分析。试验表明,胶粉加入会降低混凝土的抗压和抗折强度,但对胶粉进行改性后,对混凝土强度的影响减弱;经KH550改性的胶粉混凝土较未改性和NaOH改性的胶粉混凝土的塑性有较大提高;KH550改性的胶粉混凝土的最大冲击韧性较未改性和NaOH改性的分别提高了54%和16%。

Influence of crumb rubber modified with two different modifying agents on compression strength and bending strength,plasticity and toughness of concrete are introduced,and preliminary analysis is made on its mechanism of influence by the aid of electron microscope photograph. The experiments indicate that adding rubber powder will reduce compression strength and bending strength of concrete,but after modification of the rubber powder, its influence on strength of concrete is reduced;the plasticity of rubber concrete modified by KH550 is improved greatly than that of modified by NaOH or without modification. The maximum impact toughness of rubber concrete modified by KH550 is increased 16% and 54% than that of modified by NaOH or without modification respectively.