The Research On Self-Compacting Lightweight Aggregate Concrete

Self-compacting lightweight aggregate concrete have the characteristics of ordinaryconcrete and lightweight aggregate concrete. It is mainly used in high-rise buildings andlarge-span structures, the usage can greatly reduce the structural weight and noise pollution,and it also can improve seismic performance and thermal insulation performance of structure.By insulating masonry and of self-compacting lightweight aggregate concrete compositeframe structures composed of insulation structure, constructional column and circle beam ispoured of self-compacting lightweight aggregate concrete, a new kind of load-bearing wall ofenergy saving. Masonry structure as a whole to achieve a single objective of energy-savingwall material, realized the integration of structure and thermal insulation. Since the basicmechanical properties of self-compacting lightweight aggregate concrete composite framestructures, this article mainly study on the workability and mechanical performance ofself-compacting lightweight aggregate concrete.1. Mix proportion design of self-compacting lightweight aggregate concrete. Fixed gravelvolume calculation method and calculation method are used to calculate the mix, and thenusing orthogonal design method, analysis on gravel, sand、fly ash and water-reducingfactors influence concrete performance, access to meet the requirements of the optimal mix.2. Study on the workability of self-compacting lightweight aggregate concrete. According tothe evaluation criteria and methods of SCLC, combined with slump-flow test, L-box test andJ-ring test to analyze the mobility, deformability and reinforced through ability. Preparation tomeet the performance requirements of concrete.3. Study on the basic mechanical properties of self-compacting lightweight aggregate concrete.According to "Ordinary Concrete Mechanics Test Method Standard" and "The Design andConstruction of Self-Compacting Concrete Guidelines", the following aspects are tested:compressive strength, split tensile strength, rupture strength, elasticity modulus, Poisson’sratio and constitutive relation. The compressive strength of concrete cubes are prepared byaverage of29.02Mpa, meet the requirements of SCLC25strength; splitting tensile strengthand flexural strength are respectively of2.06Mpa and1.72Mpa, slightly less than commonconcrete; modulus of elasticity for the Ec=2.2x104Mpa, Poisson’s ratio of0.21, constitutiverelation provide the mechanical parameters for theoretical analysis and finite elementnumerical simulation.4. Study on early shrinkage performance of self-compacting lightweight aggregate concrete.Won the43days of shrinkage strain of5x10-4, higher than common concrete.5. Study on the bond behavior of self-compacting lightweight aggregate concrete and steel.By steel pull-out test, bond strength can be obtained, change rule of bond stress with steel barembedded length can also be obtained. On the basis of these, affecting factors can beanalyzed.