Relationship between liquid sorptivity and capillarity in concrete

Summary

Water is the main cause of degradation of building materials and several techniques are available to monitor moisture. Neutron radiography (NR) is very useful to observe moisture movement through concrete or brick and can also be used to monitor other liquids some of which are required to penetrate the material (e.g. hydrophobic impregnation agents). In this study NR  was applied to study liquid transport processes in concrete. It is possible to monitor the liquid distribution inside specimens and to measure the height of the liquid front for liquids of high hydrogen content inside concrete. The experiment was performed with water and fuel oil for three different types of concrete. The results are compared with the sorptivity measured by the gravimetric method. It is shown that the ratio between the capillarity coefficient and sorptivity depends upon the combination of liquid and solid phases. For water, this value was found to be 5.5±0.6, 5.8±0.6 and 7.1±0.7 in concrete without additives, concrete with an air-entraining agent and concrete with a plasticiser, respectively. For fuel oil, the value is about 50% higher than that for water. 11 refs.

Primary author(s): Hanzic L; Ilic R

Source: Cem.Concr.Res.

             33,No.9,2003,p.1385-1388

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