Study on frost resistance and damage performance of CFG pile concrete modified by rubber particle
The rubber particles with different particle sizes and contents were used to replace the fly ash in the cement fly ash gravel pile(CFG pile).The freeze-thaw cycle and indoor compressive strength tests were carried out to study the frost resistance of the improved CFG specimens.The results show that the specimens with appropriate amount of rubber particles have better integrity when they are destroyed.After freeze-thaw cycles,the strength attenuation rate and mass loss rate of the specimens are significantly reduced,which is beneficial to improve the frost resistance of the specimens.The smaller the particle size of rubber particles,the better the frost resistance of the specimen,and the smaller the influence on the strength attenuation.Based on the results of orthogonal test,the order of factors affecting the strength and mass loss rate of the specimens was determined.It is found that the optimal mixing ratio is rubber instead of fly ash 20%and rubber particle size 20 mesh.The freeze-thaw-loading damage model of the specimen was derived,and the experimental data were fitted and verified.The fitting results are in good agreement with the experimental data.Through the freeze-thaw-loading damage model and the related parameters of the total damage variable DΩ,the evolution characteristics of the freeze-thaw-loading damage variable were obtained.
rubber particlefly ashfrost resistancestrength attenuationmass loss ratedamage variable
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