Experiment results showed that compound use of efficient water-reducing admixture and retarding agent can efficiently control the pumped concrete slump loses through time.
试验结果表明，复合使用高效减水剂和缓凝剂，能有效控制混凝土坍落度经时损失。
Influence of high range water reducing admixture (HRWRA) on performance and cost of concrete was discussed. An economical dosage for HRWRA was found and its model established.
讨论了减水剂对混凝土性能和成本的影响，指出减水剂存在一个经济掺量，并建立了经济掺量模型。
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