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Conversion relationship between mechanical properties and strength indexes of stone sand lightweight aggregate concrete

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Document pages: 12 pages

Abstract: This is a study on the basic mechanical properties of shale aggregate concrete with specified density, which is based on different replacement rates of stone lightweight aggregate concrete (stone LAC) and sand lightweight aggregate concrete (sand LAC). Stone and river sand were used instead of ceramsite and ceramsite respectively. Many tests have been carried out on the basic mechanical properties, including cube compressive strength, axial compressive strength, splitting tensile strength, bending strength, elastic modulus and Poisson s ratio. The failure mode of shale aggregate concrete with specified density is obtained. The effect of replacement rate on the constant density mechanical properties of shale aggregate concrete is analyzed. Calcoraion models were implemented for elastic modulus, for the conversion relations between the axial compressive strength and the cube compressive strength, and for the relations between the tension-compression ratio and Poisson’s ratio. It was shown that when the replacement rate of stone or river sand increased from 0 to 100 , the cube compressive strength of stone-LAC and sand-LAC increased, respectively, by 55 and 25 , the axial compressive strength increased, respectively, by 91 and 72 , splitting tensile strength increased, respectively, by 99 and 44 , and the flexural strength increased, respectively, by 46 and 26 . Similarly, the elastic modulus of stone-LAC and sand-LAC increased, respectively, by 16 and 30 . However, Poisson’s ratio for stone-LAC decreased first and then increased, eventually increased by 11 ; Poisson’s ratio for sand-LAC only reduced gradually, eventually reduced by 67 . After introducing the influence parameter for the replacement rate, the established calculation models become simple and practical, and the calculation accuracies are favorable.

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