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Research on Properties of Road Concrete in Coupling with Freeze-thawing and Loading

Author: DuZuo
Tutor: ZhaoYaDing
School: Harbin Institute of Technology
Course: Materials Science
Keywords: frost region pavement concrete dynamic load freeze-thawcycle coupling effect
CLC: U414
Type: Master's thesis
Year: 2011
Downloads: 66
Quote: 0
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Abstract


In seasonal frost regions, the damage and destruction of cement concretepavement which affected by traffic loading and freeze-thawing is inevitable,especially traffic loading, a large hot-cold temperature gradient and coupling withfreeze-thawing have aggravated the damage extent of concrete. The paper studies themechanical performances of concrete under the conditions of dynamic loading andfreeze-thawing cycles.The experiment simulates vehicals loading and freeze-thawing acting on thecement concrete pavement in the laboratory conditions. By simulating vehicalsloading test device which is designed and manufactured independently, the paperinvestigated that water-cement ratio, mineral admixture impacted on the mechanicalproperties of concrete under the actions of dynamic loading, freeze-thawing andcoupling with both actions.The study results show that the higher water-cement ratio, the lower the strengthof concrete as well as worse abilities resistive to dynamic loads and freeze-thawcycles; the 28-day strength of concrete with mineral admixture is low. It couldn’tobviously improve the performance that is resistant to dynamic loads and freezethawcycles as well as coupling with the two actions. However on the age of 56 days,the strengths of concrete increase significantly and concrete in low water-cementratio and with 15%-30% of fly ash or less than 30% of slag especially contributes toresist these actions. Incorporation of a large volume of slag would be detrimental tothe frost-resistance of concrete, while which is not conducive to resist dynamic loads.The damage of coupling actions is far larger than ones caused by each alone. Firstfreeze-thaw cycles and then the dynamic loads accelerates the loss of performance ofconcrete.

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