Research On Multi-axial Strength And Deformation Characteristics Of Lightweight Aggregate Concrete

In recent years in order to appear the megalithic concrete structures for example the sea petroleum platform, the crossing strait floated bridge, the skyscraper and so on, light weight of concrete itself is the main research topic for the needs of the times. Also, in the cold region sea and so on, natural environment is extremely bad condition, the durability of the concrete structure is other important research topic.This research considers these two topics, carried out uni-axial and multi-axial strength tests after freezing and thawing cycling. The effect of the silicon ash contents, freezing and thawing cycles, and stress ratio on the compressive strength and deformation behavior is analyzed.On the basis of test result, based on the unified strength theory, proposed multi-axial strength criterion with the consideration of the strength characteristics of lightweight aggregate concrete under high compression, and obtained the strength and deformation characteristics of lightweight aggregate concrete after the freeze-thaw cycles, for example ultimate compressive strength, strain of the peak stress, elastic modulus, stress-strain curves and so on, provides the experiment and the theory basis for the lightweight aggregate concrete structure analysis.