Flexural Performance and Failure Mechanism of High-Strength Coral Sand Reinforced Concrete Slab by Experiment and Simulation

Abstract

Coral sand is very important to the construction of coastal defense engineering, and the research of coral sand concrete slabs is also in the initial stage. To investigate the mechanical properties of high-strength coral sand reinforced concrete slab (HSCSRCS), a four-point flexural loading test was carried out for three kinds of components with different reinforcement ratios. The test results actually showed that the HSCSRCS components prepared by the optimized mix ratio and the process had the characteristics of high strength, large brittleness, and high bearing capacity, and the cracking load of HSCSRCS components was large at 30 % of the ultimate bearing capacity because of the pore filling inside the concrete aggregate. The damage process of HSCSRCS could be divided into four stages, representing the primary pressure, cracking, flexural loading, and damage stage, and the mechanical properties were relatively stable because of the broken internal particles and continuous pore filling. The initial crack of the component was mainly caused by sliding and rotation of the particles at the bottom of the loading point plate along the structural surface, which gradually expanded from the middle area to the four corners of the plate, and the distribution mode was dense at the bottom of the loading points and sparse at other areas. ANSYS finite element analysis program was used for modeling and solving, which showed that the simulation results of cracking load, bearing capacity, load-displacement curve, and stress cloud map are consistent with the actual experiment results.