Experimental Study on the Effect of Secondary Pore Defects on the Tensile and Compressive Strength of Concrete
The secondary pore defects inside concrete have significant impact on its tensile and compressive strength.The secondary porosity and pore size distribution inside concrete was simulated by various sizes of EPS particles.The compressive strength and splitting tensile strength of concrete were studied under different secondary porosity and pore sizes.Based on the grey correlation theory,the correlation analysis between secondary porosity and pore size on the compressive strength and splitting tensile strength of concrete was conducted.The research results indi-cate that the compressive strength and splitting tensile strength of concrete exhibit an approximately linear decreas-ing trend with the increase of secondary porosity.The compressive strength of concrete decreases with the increase of secondary pore size,while the splitting tensile strength shows a trend of first decreasing and then increasing with the increase of secondary pore size,which reaches the maximum value when the pore size is 4 mm.With the secondary porosity increases,both the decrease in compressive strength and splitting tensile strength of concrete also increases.The grey correlation analysis results indicate that the influence of secondary pore size on the compressive strength and splitting tensile strength of concrete is more significant compared with the secondary porosity.
concretesecondary pore defectsEPS particlesporosityaperturecompressive strengthsplitting tensile strengthtension compression ratio
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