Experimental study on the dynamic damage mechanism of concrete under freeze-thaw cycles

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Journal of Vibration and Shock ›› 2017, Vol. 36 ›› Issue (8) : 79-85.

TIAN Wei,HAN Nü,ZHANG Pengkun

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Abstract

The concrete specimen under freeze-thaw environment was experimentally studied through uniaxial compression test with different loading rates.The mass loss of specimen was measured after different freeze-thaw cycles.The complete stress-strain curve of specimen was analyzed.And the variation characteristic of uniaxial compressive strength,peak strain varying with loading rate was given.A preliminary study on the meso-structure of specimen with different loading rates was analyzed by the application of CT technology.The results indicate that the dynamic ultimate compressive strength decreases with the increasing of freeze-thaw cycles under the same loading rates,and that the dynamic ultimate compressive strength raises with the increasing of loading rates under the same freeze-thaw cycles.Cracks appearing in these specimens under low loading rates are less and propagate mainly along the weak interface,which present centralized formation.On the contrary,cracks gradually become scattered at high loading rates,which become reticular formation as well.The cracks penetrate the aggregates evidentially increase with loading rates and the number of aggregating fracture increase at exponential speed.Based on the above data,the dynamic damage mechanism of concrete was systematic studied under freeze-thaw cycles.

Key words

concrete / F-T cycle / loading rate / meso-structure

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TIAN Wei,HAN Nü,ZHANG Pengkun. Experimental study on the dynamic damage mechanism of concrete under freeze-thaw cycles[J]. Journal of Vibration and Shock, 2017, 36(8): 79-85

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