The Resistivity Respond Of The Concrete Pore Freezing

There are many research on freezing resistance of concrete and a lot of theory is proposed,for example,hydrostatic pressure theory,osmotic pressure theory,the average bubble spacing theory,tiny ice crystals model theory,etc.These theories are based on classical physics,combining the feature of cement concrete is porous structure commonly and part of the feed water,they explain concrete freeze-thaw cracking situation from different angles.Since put forward,the researchers tried to prove the theory through various methods.In this paper,according to the concrete pore solution freeze is likely to lead to concrete resistivity change,and the resistivity more easily determined through experiment,explore combine concrete freeze-thaw condition and the resistivity,analysis the resistance of the concrete freezing rate change then analysis the frozen situation of concrete pore,for the study of concrete freeze-thaw cycle of destruction,to reveal the concrete freeze-thaw deterioration mechanism provides a new way.In this paper,experimental study on the water/cement ratio,mineral admixtures,bore temperature,solution concentration,solution types and freeze-thaw cycles on the influence of hardened cement mortar resistivity,Analyzed the impact of cement mortar pore freezing mechanism of resistivity,resistivity model is established.Through the test of the model is verified by the established model,to predict the concrete solution concentration and temperature and the freezing of pores within the concrete situation.This article main research content and conclusion is as follows:1.Understand the relation between concrete pore diameter and the freezing point of pore solution,then master the concrete internal pore distribution,understand the current mode of transmission in the concrete,understand the concrete freezing conditions and the relationship between the change of resistivity,set up the concrete resistivity model under low temperature what consider the effects of pore solution freezing.2.Experimental study on the water/cement ratio,mineral admixtures and mixing ratio on the resistivity and the effect of full water hardening cement mortar to analyze its mechanism of the influence of resistivity of concrete.3.Experimental study on the affact of temperature and types and concentration of feed water to the resistivity of hardening cement mortar,analysis the mechanism of the influence of resistivity of concrete.4.Experimental study on the affact of the freeze-thaw cycle to the resistivity of hardening cement mortar,analysis the mechanism of the influence of resistivity of concrete.5.Analysis the affect of the resistivity of hardening cement mortar through graytheory.