论文部分内容阅读
以一种新型环保高性能混凝土——橡胶钢纤维再生骨料混凝土(RSRAC)为研究对象,探讨高温损伤和橡胶掺量对其抗压和抗弯性能的影响。试验设计了6组不同配合比的RSRAC[橡胶掺量(体积分数)分别为0%、4%、8%、12%和16%],考虑了4种不同温度(25℃、200℃、400℃和600℃)作用,制备了72个尺寸为150mm(直径)×300mm(长)的圆柱体和72个尺寸为150mm(高)×150mm(宽)×550mm(长)的小梁试件。通过实施轴压和三点弯曲试验,分析了高温损伤和橡胶掺量对RSRAC轴压和弯曲的破坏形态、抗压和抗弯强度、弹性模量、韧性等影响规律。研究结果表明:随着温度逐渐升高,RSRAC的抗压强度和抗弯强度出现大幅下降,抗压和抗弯强度与温度几乎呈线性关系;适量橡胶的掺入对提高RSRAC高温作用后的抗压和抗弯性能有一定的帮助;计及各级温度作用的影响,4%~8%是RSRAC抗压强度和弹性模量的最优橡胶掺量,8%~12%是RSRAC抗弯强度的最优橡胶掺量。
A new type of environmentally friendly high performance concrete - rubber steel fiber recycled aggregate concrete (RSRAC) was studied to investigate the effects of high temperature damage and rubber content on its compressive and flexural properties. Six groups of RSRAC with different mixing ratios (0%, 4%, 8%, 12% and 16%, respectively) were designed and tested. Four different temperature (25 ℃, 200 ℃, 400 72 cylinders of 150 mm in diameter by 300 mm in length and 72 in diameter were prepared with a size of 150 mm (height) × 150 mm (width) × 550 mm (length). The effects of high temperature damage and rubber content on the failure modes, compressive and flexural strength, elastic modulus and toughness of RSRAC were analyzed through axial compression and three-point bending tests. The results show that compressive strength and flexural strength of RSRAC decrease sharply with increasing temperature, and the compressive strength and flexural strength have almost linear relationship with temperature. The proper amount of rubber can improve the resistance of RSRAC Pressure and bending resistance of a certain amount of help; Taking into account the effect of temperature at all levels, 4% to 8% is RSRAC compressive strength and elastic modulus of the best rubber content, 8% to 12% RSRAC flexural strength The best rubber content.