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Influence of Moisture Exchange on Cement Hydration…
Author:ZHOUJian1 YEGuang1 2 vanBREUGELKlaas1(1.M… FacultyofCivilEngine… DelftUniversityofTec… Delft theNetherlands 2.MagnelLaboratoryfo… DepartmentofStructur… GhentUniversity Technologiepark-Zwij… Ghent(Zwijnaarde) Belgium) 
Keyword:concrete repair moisture exchange cement hydration bond strength porosity 
Year,volume(Issue):page number:2010,38(9):1665-1670

After placing repair material on concrete substrate,the moisture exchange takes place between the repair material and the concrete substrate,driven by the capillary pressure gradient.The resultant change of water content in the repair material affects the cement hydration process,the microstructure development and thus the bond strength.In this paper,the influence of moisture exchange on the degree of hydration and porosity of the repair material and on the bond strength between two materials was investigated.The experimental results show that the saturated concrete substrate can provide the additional water for the hydration of the repair material and lead to a higher degree of hydration.When placing a repair material on an unsaturated concrete substrate,the unsaturated concrete substrate can absorbs a large amount of water from the repair material.The water loss in the repair material results in a de-crease in water cement ratio.Consequently,the repair material cast on the unsaturated substrate shows a lower degree of hydration and a lower porosity compared to those cast on the saturated substrate.Also the decrease of water cement ratio leads to a high bond strength between the repair material and the concrete substrate.

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[1]EMMONS P H,VAYSBURD A M.Factors affecting the durability of concrete repair:the contractor's viewpoint[J].Construct Build Mater,1994,8(1):5-16. [2]COURARD L.Adhesion of repair systems to concrete:Influence of interfacial topography and transport phenomena[J].Mag Concr Res,2005,57(5):273-282. [3]European standard.EN480-5,Admixtures for concrete,mortar and grout-Test methods-Part5:Determination of capillary absorption[S].Europe:EN,2005. [4]YE G.Experimental Study and Numerical Simulation of the Develop-ment of the Microstructure and Permeability of Cementitious Material(dissertation).Delft:Delft University of Technology,2003. [5]POWERS T C,BROWNYARD T L.Studies of the physical properties of hardened portland cement paste[J].ACI J,1946,43:101-132. [6]European standard.EN14488-4,Testing sprayed concrete-Part4:Bond strength of cores by direct tension[S].Europe:EN,2008.

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