Performance criteria for concrete durability : by H. Hilsdorf, J. Kropp

By H. Hilsdorf, J. Kropp

This can be a state of the art record ready by way of RILEM Technical Committee 116-PCD and is an authoritative, foreign evaluation of the topic and is an important reference resource for engineers and technologists.

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this can be a state of the art file ready through RILEM Technical Committee 116-PCD and is an authoritative, overseas assessment of the topic and is a vital reference resource for engineers and Read more...

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Sorptivity decreases for the same concrete when tamping is prolonged. (f) Age As capillary porosity decreases with the progression of hydration reaction, so concrete water absorption decreases with age. Marchese et al. 49] have worked on the water absorption of pastes and mortars with an age of 8 months and 1 year, respectively. 19. 20. 20). 2 WATER ABSORPTION OF CONCRETE WITH ADDITIVES Many studies have been made on the influence of additives on concrete water absorption. However, water absorption measurements carried out on concrete do not clearly show the influence of additives, because some authors compare concretes of equal 28-day strength; other work deals with equal-workability concretes or equal w/c ratio.

In fact, results to be found in the literature are extremely varied, and it is difficult to form a clear idea about the influence of mineral additions. Moreover, additives are often used to replace clinker, resulting in cement of different strengths as well as in variations in hydrate quantities at the time of testing. The effect of additions is often analysed in terms of its activity on pore distribution. In slag-blended cement pastes, the volume of pores greater than 100 µm is negligible, even in young samples.

This reports deals only with the influence of the type and proportions of the constituents, as well as with the effect of age and curing conditions. We shall study water absorption of ordinary Portland cement (OPC) concrete in a first part without additives, and in a second part concrete with additives. 1 WATER ABSORPTION OF OPC CONCRETE WITHOUT ADDITIVES (a) Water/cement (w/c) ratio For concrete, the water absorption is reduced when the water/cement ratio decreases. The results of Schönlin and Hilsdorf [4.

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