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.
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。
The fast setting of most building gypsum is unfavourable for construction. So the retarding effect of impurities can be utilized positively.
对凝结非常迅速而不利于施工的半水石膏而言，杂质的缓凝具有利用价值。
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