Download Euro-Cements: Impact of ENV 197 on Concrete Construction by Ravindra Dhir, M.R. Jones PDF

By Ravindra Dhir, M.R. Jones

This ebook stories the consequences of the hot eu common for cements. It explains the conformance standards for Portland-type cement on present concrete specification, construction and placement practices. It brings jointly contributions from prime specialists concerned with the drafting and implementation of ENV 197 and may facilitate dialogue on its software. as well as insurance of the technical points of the typical Portland cements, the rising ecu specification for 'special' cements could be mentioned. the supply and standards for various cement kinds could be reviewed. The publication is derived from a seminar held on the collage of Dundee in September 1994. will probably be crucial studying for these heavily interested by the technical/commercial marketplace for cement within the united kingdom and in Europe.

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Hartmann : CDF—Test Specifications. Betonwerk und Fertigteil—Technik 57 (1991), S. 83/86. RILEM Recommendations. (1988) CPC-18 Measurement of hardened concrete carbonation depth. Materials and Structures. November 1988. pp 453–455. MINOR ADDITIONAL CONSTITUENTS: PERMITTED TYPES AND BENEFITS G MOIR Chief Chemist Blue Circle Industries plc, UK Abstract The types of minor additional constituents (mac) permitted by current British Standards and by ENV 197–1:1992 are reviewed. Their influences on cement early age and strength development properties are discussed.

In addition, CaCO3 appears to interact with the hydrating C3A to form a carboaluminate phase [5] and to become partially incorporated in the C-S-H phase [6]. The overall extent of reaction is, however, relatively small and even after 4 months hydration 80–90% of the CaCO3 remains unreacted as determined by X-ray diffraction [5]. MINOR ADDITIONAL CONSTITUENTS 39 Fig. 4 Relationship between SSA and concrete bleeding. In the BCA/BRE investigations the presence of 5% fly ash or slag was actually found to lower the initial hydration rate, as indicated by the paste setting time.

Burnt shale is finely ground and must have a compressive strength of at least 25 N/mm2 at 28 days when tested in accordance with EN 196(2), except that the mortar is prepared with burnt shale alone instead of with cement. The mortar specimens are demoulded 48 hours after preparation and cured in a moist atmosphere of at least 90% RH until tested. The expansion of burnt shale must be less the 10mm, when tested in accordance with EN 196, using a mixture of 30% by mass of ground burnt shale and 70% by mass of reference portland cement.

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