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Slump tests

Concrete Admixtures

MBT Admixtures organised a site trial of Glenium SKY for NCE at London Concrete's Heathrow batching plant earlier this month to demonstrate the improved workability that can be achieved using Glenium SKY.

Two mixes were made, the first including the addition of 1% of the company's plasticizer Rheobuild 716, which is commonly used in civil engineering structures such as those on Heathrow's Terminal 5 and the Channel Tunnel Rail Link. The second mix included the addition 1.2% of Glenium SKY.

Both batches included 300kg of cement per m 3and both had a water/cement ratio of 0.55.

Mix 1 had an initial slump of 100mm, which went down to 80mm after 30 minutes, then down to 60mm after an hour. By 75 minutes it had stiffened up and the slump did not reduce further.

Mix 2 started out with a slump of 190mm, which did not change after 30 minutes, then went down to 165mm after and hour and 150mm after 90 minutes. At that stage it was still workable, with a malleable feel. It retained its viscosity, had not segregated and did not feel watery.

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