Time-Dependent Behavior of High-Early-Strength Concrete Containing a Superplasticizer


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Title: Time-Dependent Behavior of High-Early-Strength Concrete Containing a Superplasticizer

Author(s): J. J. Brooks, P. J. Wainwright, and A. M. Neville

Publication: Special Publication

Volume: 68


Appears on pages(s): 81-100

Keywords: admixtures; age-strength relation; compressive strength; creep properties; creep recovery; high-strength concretes; modulus of elasticity; plasticizers; portland cements;

Date: 1/1/1981

Strength, elasticity, shrinkage, swelling and creep of water-cured and steam-cured concretes (made with a rapid-hardening Portland cement) with and without the superplasticising admixture, Irgament ‘Mighty’ 150, have been compared over a period of one year. The mixes have the same workability but the one with the admixture clearly has a lower water-cement ratio. Compared with the admixture-free concrete, the superplasticiser concrete has a higher strength and a higher modulus of elasticity when continuously stored in water from the age of one day. However, when exposed to drying at the age of two days, the superplasticiser concrete has higher shrinkage and creep at a constant stress-strength ratio, and, at later ages, lower compressive strength and modulus of elasticity. For the tests in which the same two concretes were subjected to a six-hour cycle of steam curing and then stored in water, the compressive strength and static modulus of elasticity are initially higher but, at later ages, this is reversed for the superplasticiser concrete; in addition, the creep is higher for this concrete. When the same steam-cured concretes are exposed to drying at the age of one day, none of the properties investigated is affected by the presence of the superplasticiser.