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Pro048

The 2004 Practice and Potential of Internal Curing of Concrete Using Lightweight Sand



Title: The 2004 Practice and Potential of Internal Curing of Concrete Using Lightweight Sand
Author(s): John W. Roberts
Paper category : conference
Book title: International RILEM Symposium on Concrete Science and Engineering: A Tribute to Arnon Bentur
Editor(s): J. Weiss, K. Kovler, J. Marchand, and S. Mindess
Print-ISBN: None
e-ISBN: 2912143926
Publisher: RILEM Publications SARL
Publication year: 2004
Language: English


Abstract: Northeast Solite CorporationThe early-age results we see in concrete, which are a consequence of Internal Curing (IC), are now, in 2004, regarded as a means of making good concrete better. Structural lightweight aggregate, for decades, has been incorporated in concrete to make it lighter, more insulative, more fireproof, more crack resistant, and more durable. This has been named lightweight concrete. The coarse aggregate has been lightweight aggregate; the fine aggregate has been either natural sand or lightweight sand. Lightweight absorptive fine aggregate is now seen as an unheralded carrier of water, over and above the mixing water, into a normal-weight concrete mixture to beneficially hydrate the cement not otherwise hydrated in low water-cement (w/c) ratio concrete. The result is called Internal Curing. IC imparts certain qualities (improved early age strength, reduction of autogenous shrinkage and cracking, lower permeability, and greater durability) to any low w/c ratio concrete. In August 2002, George Hoff summarized the then state-of-knowledge on internal curing in his report titled “The Use of Lightweight Fines for the Internal Curing of Concrete” (www.nesolite.com/reports/solitepaper.pdf). Since then various researchers, practitioners, DOT’s, and concrete products manufacturers have developed break-through information documenting just how internal curing causes improvements in certain critical parameters, and just how the knowledge can be used in a number of applications. Concrete bridges, parking structures, pavements, precast concrete and high performance concrete are now addressing the use of IC to improve performance.


Online publication: 2004-03-25
Classification: Mixture Proportions and Case Studies
Publication type : full_text
Public price (Euros): 0.00
doi: 10.1617/2912143926.035