Experimental Study On The Performance Of Multiscale Fiber Lightweight Concrete

Fiber Lightweight Concrete(FLC)is a new building material based on ordinary concrete by adding fiber and lightweight aggregate instead of ordinary aggregate.Its high ductility and high resistance crack have become the research object of current hot spot.For multi-scale FLC to compressive strength,split strength,flexural strength and flexural toughness test,the use of lightweight aggregate to replace ordinary aggregate analysis of lightweight aggregate replacement rate and fiber scale effect on the properties of concrete,At the same time,the distribution of fiber was analyzed by electron microscope,It provides an important theoretical basis for the future development of concrete industry.The results of the research on the properties of multi-scale copper-plated steel fiber lightweight concrete show that the mechanical properties are mainly determined by the fiber size and the replacement rate of lightweight aggregate.The longer the fiber size and the smaller the replacement rate of lightweight aggregate,the better the mechanical properties will be.The results of the research on the properties of multi-scale ceramic fiber lightweight concrete show that concrete are mainly determined by the replacement rate of lightweight aggregate,and there is no obvious correlation with the size of ceramic fiber.The smaller the replacement rate of lightweight aggregate,the better the mechanical properties.The results of the study on the properties of multi-scale copper-plated steel fiber and fiber-ceramic fiber lightweight concrete show that its mechanical properties are obviously better than any single fiber concrete,but its mechanical properties mainly depend on the size of copper-plated steel fiber and the replacement rate of lightweight aggregate,the effect of ceramic fiber size is not obvious.Through the microscopic analysis of the damaged specimens of hybrid fiber concrete,it is found that the ceramic fiber is distributed randomly around the copper steel fiber,and both of them jointly restrain the development of concrete cracks from different levels,and greatly improve the mechanical properties of concrete.Figure 27;Table 34;Reference 58...