A Fundamental Study on Set-Retardation of Concrete Due to Superplasticizer

Uomoto, Taketo; Ohshita, Kenji

doi:10.3151/crt1990.5.1_119

Cited by 4 publications

(1 citation statement)

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“…Both the set acceleration caused by the silica fume and the set retardation caused by the superplasticizer correlate with the reported effects of these materials on the rate of cement hydrationÐthat is, silica fume accelerates, and superplasticizer retards the rate of hydration of the cement. 5,6 Whereas the foregoing experimental findings 4 compared the setting behaviour of mixtures with fixed cement content with and without silica fume and superMagazine of Concrete Research, 2000, 52, No. 5, Oct., 345±352 plasticizer, this paper adds new data in which silica fume is used to partially replace cement at various levels, while varying superplasticizer dosage to maintain workability.…”

Section: Introductionmentioning

confidence: 96%

Combined effects of silica fume, superplasticizer and temperature on setting behaviour

Pinto

Hover

2000

Magazine of Concrete Research

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Setting time of mortar incorporating both silica fume and superplasticizer in varying amounts is observed to be a function of temperature and composition. Temperature effects are shown to be predictable using conventional maturity techniques. Reductions in cement content and increases in superplasticizer dosage tend to retard setting, while increases in silica fume content tend to accelerate setting. Adjustment factors are developed which enable prediction of initial set time as a function of composition. Practical applications are suggested.

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Section: Introductionmentioning

confidence: 96%