Modeling of the Development of Heat of Hydration in High-Performance Concrete


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Title: Modeling of the Development of Heat of Hydration in High-Performance Concrete

Author(s): C. Wang and W. H. Dilger

Publication: Special Publication

Volume: 154


Appears on pages(s): 473-488

Keywords: heat of hydration; high-strength concretes; hydration; mathematical models; superplasticizer; temperature; water-cement ratio; Materials Research

Date: 5/1/1995

As a result of the very low water-cement ratio in a high-performance concrete, the rate of cement hydration at early ages is significantly different from that in a normal strength concrete. The ultimate degree of cement hydration is lower in a high-performance concrete; the hydration process will terminate earlier because of the rapidly diminishing water supply. Another characteristic of high-performance concrete is caused by the relatively high dosage of superplasticizer which delays the onset of the cement hydration. This paper presents the extension of the research on temperature and strength development in hardening concrete from normal strength concrete to high- performance concrete. It models the development of heat of hydration in high-performance concrete, taking into account the effects of water-cement ratio, superplasticizers, and temperature changes. General formulations of the rate of heat of hydration as functions of concrete maturity (hydration stage) and current temperature are provided. Comparison with some test results verifies the theoretical model.