Experiment and analysis were set for retarder, and retarding plasticizers were matched to analyze the concrete performance.

对缓凝剂进行试验和分析，并配置缓凝型减水剂，对混凝土的性能进行分析。

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The test results show that the quicker the initial set of plaster the greater the difference between the initial setting times of the plaster with addition of s type retarder.

试验结果表明，所用建筑石膏的初凝时间愈快，掺有S型缓凝剂后其初凝时间差愈大。所以，初凝时间差不宜作为石膏缓凝剂的缓凝效果指标。

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For concrete mixing. coal ash and VZ set retarder were adopted;

混凝土拌制中掺粉煤灰和VZ缓凝减水剂；

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For concrete mixing. coal ash and VZ set retarder were adopted;

混凝土拌制中掺粉煤灰和VZ缓凝减水剂；

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