Study on mechanical characteristics and engineering application of sand lean concrete in self-compacting desert
Based on the laboratory model test,the strength and stiffness parameters of the self-compacting desert sand lean concrete with different mix ratios were calibrated.The results show that:(1)The cement content in the self-compacting desert sand lean concrete is related to the uniaxial compressive strength and elastic modulus,approximate linear growth relationship;(2)When the cement content is from 11.9%to 21.3%,the uniaxial compressive strength is between 1.5 MPa and 7 MPa,and the elastic modulus is between 120 MPa and 350 MPa;(3)Compared with ordinary concrete,the strain at the peak stress of the self-compacting desert sand-lean concrete is about ten times that of ordinary concrete,indicating that its ductility is better;(4)Compared with the traditional compacted soil,the self-compacting desert sand-lean concrete has high strength and large deformation modulus;(5)Under a suitable water-cement ratio,desert sand-lean concrete can achieve self-compacting,improve construction speed and mechanization level,and can be used for rapid road widening,pipe gallery backfill,bridge abutment back fast backfill and high edge slope monolithic roadbed and other projects.
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