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The effects of a new mixing technique on the properties of the cement paste-aggregate interface

✍ Scribed by A.K. Tamimi

Publisher: Elsevier Science
Year: 1994
Tongue: English
Weight: 321 KB
Volume: 24
Category: Article
ISSN: 0008-8846
DOI: 10.1016/0008-8846(94)90114-7

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✦ Synopsis

This research programme is based on a mixing technique in which concrete is produced by adding water at two separate times.In the first stage; aggregate and a water content of 25% of the specified weight of cement were mixed for 30 sec; cement was then added and mixed for a further 60 sec. In the second stage, the remaining water was added to achieve the required free water/cement ratio and mixed for 90 sec.Compared with the conventional concrete, the two stage concrete exhibits lower bleeding and a higher rate of strength development in the entire range of mixes studied. However,mixes of high workability showed significant improvement in compressive strength. Micro-hardness tests showed that the two-stage mixing technique increased the value of both minimum and maximum micro-hardness of the cement paste-aggregate interface compared with the conventional concrete.

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