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Home > Publications > International Concrete Abstracts Portal
The International Concrete Abstracts Portal is an ACI led collaboration with leading technical organizations from within the international concrete industry and offers the most comprehensive collection of published concrete abstracts.
Title: Time of Setting Influenced by Inclusion of Fly Ash and Chemical Admixtures
Author(s): Tarun R. Naik, Shiw S. Singh, and Bruce W. Ramme
Publication: Special Publication
Appears on pages(s): 393-414
Keywords: AEA; fly ash; gypsum; HRWRA; paste; retarder; time of
setting; water reducer
Abstract:This investigation was performed to establish the effects of pozzolanic and chemical admixtures on setting behavior of cement paste at normal consistency. An ASTM Class C fly ash was used as a pozzolanic and cementitious admixture. Mixtures were proportioned to contain fly ash in the range of O-l 00% by mass of the cementitious materials using a cement replaced by fly ash in a proportion of 1: 1.25. One source of ASTM Type I cement was used. The effects of five admixtures, air-entraining agent (AEA), water reducer, retarder, high-range water-reducer (HRWRA), and hemihydrate gypsum (CaSO,. 1/2H2O) on setting characteristics of pastes, were investigated. Both initial and final setting times remained essentially the same or were slightly delayed up to 20% cement replacement with respect to the 0% fly ash mixture. Beyond this range, the times of setting were generally accelerated. Increased rate of setting occurred at cement replacement levels of 40 % and above irrespective of type of chemical admixtures used.
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