在延迟成型时间较长时，SRA起到的缓凝作用比木钙更明显。
The SRA has better effect than lignosulphonate calcium as the forming retarded time is longer.
掺加柠檬酸对石膏具有明显的缓凝作用，但同时使制品的力学性能降低。
Besides, this result indicates that addition of citric acid has an obvious setting retarding effect on gypsum but may reduce the mechanical performance of its products.
研究结果表明：亚硫酸钙对C_4AF有缓凝作用，而对C_3A基本不具缓凝作用；
The results showed that CaSO3 had retarded setting action on C4AF but didn't influent C3A;
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