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速凝剂是喷射混凝土施工不可缺少的一种外加剂。它的作用在于促使混凝土迅速凝结、硬化,有效地抵抗在喷射混凝土时因重力所引起的脱落或空鼓;提高混凝土的粘结力,缩短施工间隙时间,增大一次喷射厚度,减少回弹量;提高喷射混凝土的早期强度,及时地发挥结构承载力。国内目前大量使用的是粉状无机盐类速凝剂,这类产品,按现规定的测试方法,一般都能满足五分钟内初凝,十分钟内终凝的要求,详见表1,
Accelerating agent is an indispensable admixture for shotcrete construction. Its role is to promote the rapid condensation of concrete, hardening, effectively resist the falling or emptying due to gravity in the shotcrete; improve the adhesion of concrete, shorten the construction gap time, increase the thickness of a shot, reduce the rebound Improve the early strength of shotcrete and timely exert structural bearing capacity. In China, a large number of powdery inorganic salt accelerators are currently used. According to the current test methods, these products generally meet the requirements for initial condensation within five minutes and final condensation within ten minutes. See Table 1 for details.