Experimental Study On The Flexural Behaviors Of C30 Self-Compacting Concrete Simply Supported Beams After Freeze-Thaw Cycles

Self-compacting concrete is a green, high-performance concrete,which has the important status in the concrete engineering due to excellent work performance and is considered to be one of the development direction of concrete technology.With the deepening of the Self-compacting concrete research,With the deepening of the Self-compacting concrete research,Its durability problem has become the focus of the researchers attention.Among them,the freeze-thaw is one of the key factors that affect the durability of concrete.Xinjiang is in the northwest of the motherland,which have a cold and cold climate area in the building thermal design zones of China, the temperature difference is large, positive and negative temperature alternates frequently,wet and dry also alternates frequently.Therefore,studying the effect of freeze-thaw of Self-compacting concrete durability has important engineering significance in the Xinjiang region.This paper formulates C30 self-compacting concrete and ordinary concrete by using raw materials of Xinjiang and carried on the fast freeze-thaw test of concrete sample.At the same time,Studying the bending mechanical properties of the two kinds of concrete beam after different freeze-thaw cycles times.Compareing the relative dynamic elastic modulus, mass loss rate and moisture content of the C30 Self-compacting concrete and ordinary concrete after different freeze-thaw cycles times by experiment.Getting the relationship between the various indicators and freeze-thaw cycles and analyzing the difference between Self-compacting concrete and ordinary concrete frost resistance performance.Studying the cube compressive strength, prism axial compressive strength and splitting tensile strength after different freeze-thaw cycles of self-compacting concrete,geting the relationship with the freeze-thaw cycles and the basic mechanical properties’ differences of self-compacting concrete and ordinary concrete after freeze-thaw cycles by experiment.On the basis of test data analyzed the flat section assumption, longitudinal reinforcement strain,cracking load, yield load, ultimate load and the short-term stiffness performance after different freeze-thaw cycles of self-compacting concrete,geting the variation law with the freeze-thaw cycles and the bending performance’s differences of self-compacting concrete and ordinary concrete after freeze-thaw cycles.