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Measurement of Water Transport from Saturated Pumice Aggregates to Hardening Cement Paste.


pdf icon Measurement of Water Transport from Saturated Pumice Aggregates to Hardening Cement Paste. (1210 K)
Lura, P.; Bentz, D. P.; Lange, D. A.; Kovler, K.; Bentur, A.; vanBreugel, K.

Advances in Cement and Concrete. Proceedings. Engineering Conferences International. August 10-14, 2003, Copper Mountain, CO, 89-99 pp, 2003.

Keywords:

cement paste; aggregates; curing; concretes; water transport; hydration; x-ray absorption

Abstract:

In this study about internal curing of High Performance Concrete, X-ray absorption showed that considerable transport of water from saturated lightweight aggregates (pumice) to hydrating cement pastes (w/c ratio 0.3) took place in the first days after casting and covered a distance of at least 4 mm. As a consequence, the amount of water released by the lightweight aggregates, rather than the spatial distribution of the aggregates, is in this case the crucial factor to avoid early-age self-desiccation shrinkage.