浸-烘循环作用下橡胶水泥混凝土的性能研究

Study on Properties of Rubber Included Cement Concrete under Wet-Dry Cycling

摘要:

通过试验，研究了橡胶水泥混凝土在水或Na2SO4／NaCl复合盐溶液中长期浸泡以及在常温浸泡、55℃烘干的浸-烘循环作用下其相对动弹性模量、抗压强度、抗弯强度的变化以及混凝土中的氯离子浓度分布，分析了橡胶水泥混凝土性能劣化的机理．研究表明：橡胶水泥混凝土长期浸泡在水或复合盐溶液中的性能与对比混凝土相当，但在浸-烘循环作用下，橡胶水泥混凝土的性能随循环次数的增加逐渐劣化，复合盐溶液的作用又进一步加剧了橡胶水泥混凝土性能的劣化．因此，橡胶水泥混凝土不宜应用于长期处于干湿交替、干热或有硫酸盐腐蚀的环境中．

Abstract:

The relative dynamic modulus of elasticity,compressive strength,flexural strength and the concentration of chloride in rubber included cement concrete treated with water or mixed salt solution were investigated.The mechanism of the degradation of rubber included cement concrete is briefly analyzed.The experimental results show that rubber included cement concrete performs comparably with reference concrete when concretes are immersed in water or mixed salt solution,however,under the action of wet-dry cycling,the properties of rubber included cement concrete is much inferior to that of reference concrete.Furthermore,the action of mixed salt solution accelerates the degradation of rubber included cement concrete.It is therefore suggested that rubber included cement concrete should not be used where long-term wet-dry cycling,hot and dry weather occurs or where sulfate attack may happen.