title: [In situ measurement of the permeability of concrete by FTIR-MIR].
abstract: Fourier transform infrared spectroscopy with multiple internal reflection mode (FTIR-MIR) has been applied for the first time to measure the permeability of concrete. The effect of water-cement ratio and curing time on the microstructure and permeability of concrete was studied. Also, the penetration process of H2O and SO4(2-) through the concrete specimens was investigated. The results indicated that the movement of H2O through unsaturated concrete was mainly caused by capillary suction and the movement of SO4(2-) through unsaturated concrete should take into account diffusion, advection caused by a capillary suction flow and the reaction between SO4(2-) and the cement hydration products. The permeability of concrete was determined by its microstructure. With the decrease in water-cement ratio and the increase in curing time, the porosity and the connectivity of pores in concrete decreased, which resulted in the decrease of concrete permeability.
authors.affiliation: State Key Laboratory for Physical Chemistry of Solid Surfaces, Department of Chemistry, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China. linjunren.student@sina.com
authors.forename: Jun-ren
authors.initials: JR
authors.lastname: Lin
authors.forename: Zhong-yu
authors.initials: ZY
authors.lastname: Lin
authors.forename: Rong-gui
authors.initials: RG
authors.lastname: Du
authors.forename: Chang-jian
authors.initials: CJ
authors.lastname: Lin