Protected paste volume in concrete: Extension to internal curing using saturated lightweight fine aggregate

One difficulty in the field use of high-performance concrete is the extensive self-desiccation and autogenous shrinkage that may occur due to its low water/cement ratio and the addition of silica fume to the mixture proportions. Several researchers have proposed the use of saturated lightweight aggr...

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Bibliographic Details
Published in:Cement and concrete research 1999, Vol.29 (11), p.1863-1867
Main Authors: Bentz, D.P., Snyder, K.A.
Format: Article
Language:English
Subjects:
Aggregate
Applied sciences
Buildings. Public works
Concrete
Concretes. Mortars. Grouts
Curing
Exact sciences and technology
Lightweight concretes
Materials
Mixture proportioning
Properties and performance of fresh concrete
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Summary:One difficulty in the field use of high-performance concrete is the extensive self-desiccation and autogenous shrinkage that may occur due to its low water/cement ratio and the addition of silica fume to the mixture proportions. Several researchers have proposed the use of saturated lightweight aggregates to provide “internal” curing for the concrete. In this communication, simple equations are developed to estimate the replacement level needed to ensure adequate water for complete curing of the concrete. Additionally, a three-dimensional concrete microstructural model is applied to determine the fraction of the cement paste within a given distance from the lightweight aggregate surfaces. The simulation results are compared with analytical approximations developed previously. This new concept for curing is similar to the protected paste volume concept conventionally applied to characterizing air void systems in air-entrained concrete.
ISSN:0008-8846
1873-3948
DOI:10.1016/S0008-8846(99)00178-7