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速凝剂:掺入混凝土中能使混凝土迅速凝结硬化的外加剂。主要种类有无机盐类和有机物类。粉状固体,其掺用量仅占混凝土中水泥用量2%~3%,却能使混凝土在5min内初凝,速凝剂12min内凝结。以达到抢修或井巷中混凝土快速凝结的目的。是喷射混凝土施工法中的添加剂。它们的作用是加速水泥的水化硬化,在很短的时间内形成足够的强度,以保证特殊施工的要求。
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1、凝结时间:初凝1~5min,终凝5~12min,适宜掺量为胶凝材料用量的3—5%;2、碱金属含量3、细度:80μm孔筛,筛余物小于10%;
4、喷射砼早期强度高,其28天龄期抗压强度保存率达80—99%;
5、喷料粘聚性好,对钢筋无锈蚀作用,提高抗渗标号,凝结快,一次喷层厚,喷拱可达130mm,喷壁可达200mm以上。
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