By H. Hilsdorf, J. Kropp
This can be a state of the art file ready via RILEM Technical Committee 116-PCD and is an authoritative, overseas evaluation of the topic and is an important reference resource for engineers and technologists.
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Additional resources for Performance criteria for concrete durability : state-of-the-art report
4). Gel pores also contribute to the possibilities of transfer across cement paste, but in a very limited way. 8] the water permeability of this phase is only 7×10−16 m/s. Mehta [4. 1] has likewise shown the influence of cement paste hydration and of the water/cement ratio on capillary porosity. 9]. This threshold is generally interpreted as a transitional stage between a system of interconnected pores and a system of isolated pores. 10]. 1 µm; an essential role is also played by their shape and connectivity.
6. 16]. 0). The permeability coefficient of pastes immediately after mixing is in the region of 10−5–10−6 m/s. As with capillary porosity, permeability decreases over a period of time, but the two are not directly proportional to each other. In fact, at the start of hydration, there is a slight decrease in capillary porosity together with a significant segmentation of the large pores, thus considerably reducing the possibilities of fluid transfer across the cement paste. 1] indicates that beyond a threshold of 30% capillary porosity, the pores are so tortuously interconnected that a decrease in paste porosity does not result in a significant decrease in permeability.
The results are shown in Fig. 18. It was evident that absorption was much smaller in wetter concretes. The effect was particularly significant when rain could fall on the exposed concrete surface. Gowripalan et al. 47] have carried out water absorption measurements on concrete that has been cured in different ways: • • • • cured under burlap; cured under plastic sheet; a poor-quality clear translucent type of curing compound; and non-cured specimens. 19 presents the coefficient of absorptivity, which is the water absorbed per unit area within a given period of exposure.