In situ measurement of the intrinsic permeability of concrete

Abstract

In this paper test methods that could be used on in situ concrete are used to obtain values for the permeability of concrete. The permeability is of interest because it significantly affects the ability of the concrete to prevent corrosion of embedded reinforcement. The important feature of the tests in this paper is that they yield values for permeability that are expressed in fundamental units and therefore have a better foundation in materials science than tests which only yield comparative data. The two in situ tests used are a new vacuum-air test using drilled holes 1 and a surface absorption test. Results from these tests are compared with direct measurements of permeability obtained in a high pressure through flow cell. The results show strong correlations but some differences in absolute values are noted.

Homogenization of discrete diffusion models by asymptotic expansion

“…For the numerical examples, the model parameters for the water diffusion through concrete are chosen to be the following: water dynamic viscosity $$\mu =8.9\times 10^{-4}$$ Pa· s, water density 10 3 kg m −3 , intrinsic permeability $$\kappa _0= 5\times 10^{-18}$$ m 2 , 54 $$m=0.5$$, $$\alpha =1$$ MPa 16 . Finally, the capacity parameter c is set to $$1.64\times 10^{-5}$$ s 2 m −2 18 …”

A mixture theory-based concrete corrosion model coupling chemical reactions, diffusion and mechanics

“…Specifically, the values of J 2 and J 3 are so large that they guarantee growth of the layer; see also remark just below Eq. (55) † We estimated the values of χ α from the Darcy law with χ α = μ/k 0 with μ the dynamic viscosity of sulfuric acid (value of 26.7 • 10 −3 kg/ms, see ( [15], p. 304-305) and k 0 the average pore size or permeability (about 1 μm 2 = 10 −12 m 2 ); see [11,24] ‡ We used δ α = δ/ρ α for α = 1, 2, 3 slaked lime has been treated in [5]. Therefore, we assume a rate equation similar to the one in [5], i.e.…”

Water vapour and liquid permeability measurements in cementitious samples

“…48, which may be seen to fit the data. For the work from Claisse et al 8 the average gas pressure was 0 . 5 atmospheres.…”

“…Previous work by the authors has been reported [6][7][8][9] to compare standard tests by calculating permeability values from them. The objective of this paper was to analyse an experiment which measures a permeability for water vapour and demonstrate that this may be related to gas and liquid permeabilities obtained using other test procedures.…”