Study On High Temperature Mechanical Properties Of Fiber Reinforced Self-compacting Lightweight Aggregate Concrete

Nowadays,green has become the main direction pursued by the construction industry.Self-compacting lightweight concrete(SCLC)is a new type of civil engineering material,which has the advantages of both self-compacting and lightweight concrete,with no vibration,light weight and high strength,and is a good green material.Therefore,the high-temperature performance of fiber-reinforced SCLC is the main issue of our discussion.In this paper,we mainly study,the mechanical properties,bending toughness,mass loss,bursting phenomenon and microscopic morphological changes of fiber concrete with different dosing and types of single-doped fibers at different fire times and mixed fibers at the same fire time with different dosing.1)To investigate the fiber influence on the internal and external temperature of concrete specimens and the change of internal stress field of concrete specimens.By adjusting the fire time of fiber concrete,the effect of different fibers on concrete bursting phenomenon was investigated.It was found that copper-plated steel fibers have good thermal conductivity and can conduct temperature better inside the concrete specimen.2)To explore some changes in the apparent characteristics of fiber concrete after fire,including mass loss rate and bursting degree,and to analyze the effects of different fibers on concrete after fire and the effects of different fiber admixtures on concrete for the same fire time.It was found that the blending of ceramic fiber is more prone to bursting.3)The cubic compressive strength of the fiber concrete after fire was tested and flexural properties were tested,and the microstructure was analyzed in detail.The structure of the interface transition zone was observed with the help of SEM scanning electron microscope,which showed that the interface transition zone out of the fire cracked and the concrete showed a large number of cracks,which explained the reason for the decrease of mechanical properties after fire due to the fire.Figure 42;Table 26;Reference 42...