In order to study the mechanical deterioration effect of concrete material in the gate station of Gaogang Water Control Project,the physical and chemical influencing factors were designed based on the engineering environment,and triaxial mechanical tests were carried out.The results showed that the corrosion concentration of chemical solution did not affect the strain failure characteristics of concrete,but had more significant influence on the bearing stress level.The corrosion time of chemical solution would change the stress and strain trends of concrete.When the corrosion time exceeded 25h,the concrete appeared the strain hardening characteristics,while strain softening characteristics when the corrosion time was less than 25h.The deterioration effect of chemical attack was more significant after 25h of corrosion.The increase of confining pressure could not only promote the bearing stress,but also restrain the chemical erosion effect.The dry and wet physical effects did not change the stress and strain trends of concrete.However,the more alternation,the weaker the bearing capacity,especially when the alternation was more than 12 times.Under the confining pressure of 5MPa,the peak stress of alternating 12～20 times was 21.4～53.4MPa,with an average reduction of 36.7%under each step.When the alternation was low,the concrete had certain resistance to dry and wet deterioration.This paper can provide a reference for studying the mechanical deterioration effect of concrete materials in hydraulic construction.
chemical erosionconcretedry and wet physical actionGaogang Water Control Project
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