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

被引：345

作者：

Bentz, DP ^{[1
]}

Snyder, KA ^{[1
]}

机构：

[1] Natl Inst Stand & Technol, Bldg & Fire Res Lab, Gaithersburg, MD 20899 USA

来源：

CEMENT AND CONCRETE RESEARCH | 1999年 / 29卷 / 11期

关键词：

aggregate; concrete; curing; mixture proportioning;

D O I：

10.1016/S0008-8846(99)00178-7

中图分类号：

TU [建筑科学];

学科分类号：

0813 ;

摘要：

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 thr 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.: (C) 1999 Elsevier Science Ltd. All rights reserved.

引用

页码：1863 / 1867

页数：5

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