DOI: 10.5703/1288284313840
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Abstract: Sixty-five pure chemicals and three proprietary retarders were tested in the penetration test for setting time at concentrations at or around 0.1% of the cement. The most effective retarders had several, closely-grouped oxygen atoms in hydroxyl, carboxyl , or carbonyl groups.Some of the retarders were used in the fabrication of 0.2 x 0.2 x 4-in. bars of cement paste, which were subsequently oven-dried and the shrinkage, non-evaporable water content, and specific surface of the paste was determined. The retarde… Show more

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