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- W608940863 abstract "This article describes the quality control and mix design required in order to obtain satisfactory results when constructing bridges in Turkey, where local materials and variable ambient temperatures may have adverse effects on the properties of fresh concrete. The projects included (a) construction of the Komurhan-Tohma combined road and railway bridge, involving the construction of slipformed piers, and a post tensioned free cantilever box beam bridge deck; and (b) bridges and viaducts of the Kinali-Sakarya motorway, including the 2nd Bosphorous bridge crossing, involving the construction of slipformed piers, incrementally launched segmental beams, and precast beams. Ambient temperatures ranged from -10 to 60 degrees centigrade. Various aggregate sources were used, ranging from Wadi sand to crushed rock fines, from igneous to sedimentary rocks. Various cements were also used. All the concrete mixes were designed to Fuller's ideal grading curves, for maximum density. A naphthalene sulphonate formaldehyde condensate (NSFC) superplasticizer was used. Admixtures limits were kept at 0.8 - 2.0% by weight of cement, and a modified steam curing cycle was used. Both construction examples required slipforming, and the setting time specified was that required by the stringent requirements laid down for slipforming, precasting, and pre or post tensioned in situ concrete. Details of the tables used to determine the correct mix design are presented, as are laboratory tests used to determine workability and high early strengths of the mixes. (TRRL)" @default.
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- W608940863 date "1990-01-01" @default.
- W608940863 modified "2023-09-27" @default.
- W608940863 title "WORKING WITH SUPERPLASTICIZERS IN CONCRETE: A WIDE FIELD APPLICATION . ADMIXTURES FOR CONCRETE: IMPROVEMENT OF PROPERTIES. PROCEEDINGS OF THE INTERNATIONAL SYMPOSIUM HELD BY RILEM (THE INTERNATIONAL UNION OF TESTING AND RESEARCH LABORATORIES FOR MATERIALS AND STRUCTURES), BARCELONA, MAY 14-17, 1990" @default.
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