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；
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。
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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