Research on Pore Characteristics and Dynamic Mechanical Properties of Road CFB Ash Concrete under the Influence of Seasonal Freezing
The influence of freeze-thaw cycle on the porosity of CFB ash concrete was studied by the laboratory freeze-thaw cycle test and SHPB dynamic test.The effects of freeze-thaw cycles and CFB ash content on dynamic mechanical properties of concrete under high strain rate are analyzed.The feasibility of CFB ash concrete is analyzed based on the influence of seasonal freezing disaster and dynamic load disturbance in highway construction.The results are as follows.Under the ac-tion of freeze-thaw circulation,the porosity of CFB ash concrete is logarithmic with the number of freeze-thaw cycles.With the increase of CFB ash content,the concrete density increases and the porosity decreases.The SHPB dynamic test was carried out on the freeze-thawed sample.With the increase of the number of test cycles,the dynamic elastic modulus and dynamic compressive strength of the sample decreased logarithmically.The dynamic peak strain increases logarithmically,and the 20%CFB ash concrete has strong dynamic compressive resistance.In highway construction,no more than 20%CFB ash can effectively reduce the porosity of concrete,increase the dynamic load bearing capacity,and improve the resist-ance to freezing damage of concrete.The research results are of great significance and reference value for exploring the me-chanical properties of CFB ash concrete and promoting its application in highway construction.
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