Download e-book for iPad: Euro-Cements: Impact of ENV 197 on Concrete Construction by Ravindra Dhir, M.R. Jones
By Ravindra Dhir, M.R. Jones
This booklet studies the results of the hot eu usual for cements. It explains the conformance standards for Portland-type cement on present concrete specification, construction and placement practices. It brings jointly contributions from top specialists concerned with the drafting and implementation of ENV 197 and should facilitate dialogue on its program. as well as insurance of the technical elements of the typical Portland cements, the rising ecu specification for 'special' cements can be mentioned. the provision and requisites for various cement forms can be reviewed. The publication is derived from a seminar held on the college of Dundee in September 1994. it is going to be crucial analyzing for these heavily thinking about the technical/commercial marketplace for cement within the united kingdom and in Europe.
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Extra info for Euro-Cements: Impact of ENV 197 on Concrete Construction
Cement 24 LIVESEY types are based on composition and on the ENV 197–1 strength classification. It is accepted that some additional cements, recognised in some countries to have sulfate-resisting properties, but with insufficient general acceptability, can be included in the National Annexes to the (pre-)standard. 5 %. 5% which is an increase on the current BS 4027 limit. Types III /B & C Blastfurnace cement where in the case of type III/B the granulated blastfurnace slag content could be as low as 63% compared with the current UK requirement for a minimum of 70%.
One property which was significantly influenced by the presence of 5% fly ash and slag was cement paste setting time. Figure 2 shows that the initial setting time was extended by 20–30 minutes by the incorporation of 5% of either material. This extension of set can be disadvantageous in certain applications. 1 Properties of fresh cement paste and concrete Figure 3, illustrates the influence of 5% limestone/raw meal on the initial setting time of cement paste and of the mortar fraction removed from the BS 4550 concrete mix.
There was insufficient experience in other countries to accept the isothermal calorimeter developed by C&CA. 1 Heat of solution The principle of the test is that specified BS 1370 and in earlier editions of BS 4246. This test has fallen into dis-use in the UK with only one laboratory equipped for the test and with only one experienced operative remaining. Several European laboratories still use the test and have developed more modern equipment for it including Italy, Germany and one laboratory in Sweden.
Euro-Cements: Impact of ENV 197 on Concrete Construction by Ravindra Dhir, M.R. Jones