动力试验模型用橡胶集料微粒混凝土力学性能初步试验研究

大型跨海桥梁结构模型试验材料的选择对于模型动力试验至关重要。试验室可实现的微粒混凝土的弹性模量限制了模型的几何比尺。采用橡胶集料等质量比例代替微粒混凝土中砂骨料的方法,通过控制变量法,研究了多种因素影响下的橡胶集料微粒混凝土的抗压强度和弹性模量。试验结果表明:对于骨料含量不变的微粒混凝土,水灰比的增大可显著降低其抗压强度和弹性模量。橡胶集料微粒混凝土的抗压强度和弹性模量随橡胶集料代替微粒混凝土中砂骨料质量比的增加而呈现一定规律降低。研究成果可用于大型跨海桥梁工程大比尺动力试验模型材料相似关系设计和结果分析。

Experimental Research on the Mechanical Properties of Crumb Rubber Microconcrete Based on Dynamic Test Model

It is important to select the proper materials to get perfect result of large sea-crossing bridge scale model dynamic test.The model's geometric scale is determined by elastic modulus of microconcrete.Compressive strength and elastic modulus of crumb rubber microconcrete under effect of multiple factors were studied through controlling variables method which employ the method of substituting crumb rubber for the same mass sand.The results show that compressive strength and elastic modulus of crumb rubber microconcrete reduce approximately as a certain law when the amount of crumb rubber increased.To the microconcrete and crumb rubber microconcrete,the water increase is helpful to reduce the compressive strength and elastic modulus.The research results can be used in the design of material similitude relations of large sea-crossing bridge scale model dynamic test.