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在喷射混凝土施工中,为了使混凝土获得较高的早期强度,增加喷层厚度,缩短两次喷层之间的间歇时间,往往掺入一定数量的速凝剂。为了使速凝剂按规定的掺量准确添加,并均匀地分布到混合物中,确保喷射混凝土的施工质量,必须采用速凝剂添加器。目前,国内好的速凝剂添加器几乎处于空白状态。施工单位大都用铲子添加,使速凝剂的掺量既不准确,分布也不匀均,在一定程度上影响了喷射混凝土的质量。国外已研制出许多种速凝剂添加器。大体可分为两类:粉状和液体速凝剂添加器。
In the shotcrete construction, in order to obtain high early strength of the concrete, increase the thickness of the sprayed layer, and shorten the interval between two sprayed layers, a certain amount of accelerator is often incorporated. In order to accurately add the quick-setting admixture in a prescribed amount and evenly distribute it into the mixture to ensure the construction quality of the sprayed concrete, an accelerator must be used. At present, the domestic good accelerator additives are almost blank. Most of the construction units use shovels to add, so that the amount of accelerator is neither accurate nor evenly distributed, which affects the quality of shotcrete to some extent. Many kinds of accelerators have been developed abroad. Generally can be divided into two categories: powder and liquid accelerator additives.