缓凝剂是一种能延缓水泥和水之间的反应速率的外加剂。它在许多场合得到了应用。缓凝剂可以使水泥浆、砂浆或混凝土的凝结时间推迟、早期强度有所降低,而对后期强度发展无不利影响。具有缓凝作用的减水剂叫缓凝减水剂。使用缓凝剂及缓凝减水剂可以延缓混凝土的凝结时间和降低水化热,进而满足 Retarders are admixtures that retard the rate of reaction between cement and water. It has been applied in many occasions. The retarder can delay the setting time of the cement slurry, mortar or concrete, and reduce the early strength, without adversely affecting the later development of strength. The water-reducing agent with retarding action is called retarding water-reducing agent. The use of retarder and retarder water reducer can retard the setting time of concrete and reduce the heat of hydration, thereby satisfying