通过掺入某些廉价组分制成复合型外加剂，使得三聚氰胺减水剂的生产成本大幅降低，从而提高其推广应用价值。
By addition of compound additives made of some cheap components, the production cost of melamine water reducing agent is greatly decreased so that the spread and application value increases.
本研究采用四种不同初凝时间的建筑石膏，掺入S型石膏缓凝剂，进行了初凝时间的试验。
In this study, tests for initial setting time of plaster are conducted by adopting plaster with 4 different initial setting times and by adding s type retarder for plaster.
建筑石膏中掺入S型缓凝剂可使凝结时间显著延缓，但强度略有降低。
When the s type retarder is added to the plaster, the setting time of plaster is delayed significantly and the strength is a little lower.
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