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Founded in 1904 and headquartered in Farmington Hills, Michigan, USA, the American Concrete Institute is a leading authority and resource worldwide for the development, dissemination, and adoption of its consensus-based standards, technical resources, educational programs, and proven expertise for individuals and organizations involved in concrete design, construction, and materials, who share a commitment to pursuing the best use of concrete.
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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: Role of Superplasticizers in Gypsumless Portland Cements
Author(s): J. Hrazdira
Publication: Special Publication
Appears on pages(s): 407-414
Keywords: clinker; compressive strength; consistency tests; pastes; portland cements; setting (hardening); sodium carbonate; superplasticizers; Materials Research
Abstract:Gypsumless portland cements (GPC) are inorganic binders that may be described as systems of ground portland clinker with a specific surface of 400 to 500 kg/m 2 (Blaine), a superplasticizer with hydroxyl groups, and a hydrolyzable alkali metal salt. The major feature of GPC is the use of a low water-cement ratio (under 0.30), based on the strong liquefying action of the superplasticizer and alkali salt in suspension of ground clinker in the absence of gypsum. The effect of the dosage of sodium lignosulfonate in combination with sodium carbonate on compressive strength, setting time, and consistency of cement paste was studied. It was found that paste properties strongly depend on dosage and mutual ratio of the admixtures. The optimum composition of the setting and liquefying regulator causes high compressive strengths 3 to 7 hr after mixing of binders (15 to 45 MPa).
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