Experimental Study On The Uniaxial And Biaxial Compression For Shale Ceramsite Concrete

The strength of the lightweight aggregate concrete is not only affected by many factors, and the range of design parameters of mix ratios is also wide in related specifications, meanwhile concrete structures are often in a state of multiaxial stress, but there are still not a appropriate mixture ratio design method and unified theory of concrete strength, which is applicable to any the failure mode of concrete in a state of biaxial stress, which results in difficulties of production and design and engineering application. So, to determine design parameter of the optimal proportion, firstly this paper studied a series of strength factors about the full lightweight shale ceramsite concrete of different strength grade, and then studied uniaxial and biaxial compressive test of full lightweight aggregate concrete, and established respectively constitutive relations and biaxial compressive failure criteria, finally this paper carried on structural aseismic checking computation to adopt different concrete material. Specifically, the following aspects were researched in the article:(1) According to the requirements of loose volume method and the strength, firstly based on the test, the parameters of constituent materials were determined(depended on strength grade), and then discussed influences of the compressive strength of concrete, such as aggregate apparent density, aggregate volume, sand ratio, particle size range, particle gradation and pre-wetted time.(2) This paper carried on the physical and mechanical performance test of full lightweight shale ceramsite concrete, physical mechanics parameters and the stress-strain curves under uniaxial stress were obtained.(3) This paper carried on biaxial compressive test of full lightweight shale ceramsite concrete, stress-strain curves under different stress ratio and corresponding fitting formula were obtained, meanwhile failure criteria and constitutive relations were established.(4) Based on a practical project, aseismic calculation and comparative analysis was carried out respectively to the structure of ordinary reinforced concrete and shale ceramsite reinforced concrete. Results showed that floor load of lightweight aggregate concrete was reduced by 14.8% than those of normal concrete, the shearing force of lightweight aggregate concrete was reduced by 32.7% than those of normal concrete.