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这种喷射混凝土用促凝剂的组成如下(重量％):超快凝水泥20～60％,高铝水泥10～40％,碱金属碳酸盐5～35％,铝酸钠5～30％,消石灰1～20％。这种促凝剂的优点是存放寿命长,使用少量促凝剂即可促进水泥砂浆和水泥混凝土的凝固。例如,将超快凝水泥50％,高铝水泥20％,碳酸钾20％,铝酸钠5％和消石灰5％混合成促凝剂。将高铝水泥500克,上述促凝剂40克和水160克混合均匀后,再同细集料1500克混合成混凝土混合物。细集料的含水量为6％。这种
The composition of the coagulant for spraying concrete is as follows (% by weight): 20 to 60% of ultra-fast setting cement, 10 to 40% of high-alumina cement, 5 to 35% of alkali metal carbonate, and 5 to 30% of sodium aluminate , slaked lime 1 to 20%. This coagulant has the advantage of long shelf life, and the use of a small amount of accelerator can promote the solidification of cement mortar and cement concrete. For example, ultra-fast setting cement 50%, high-aluminum cement 20%, potassium carbonate 20%, sodium aluminate 5%, and hydrated lime 5% are mixed into a coagulant. 500 grams of high-alumina cement, 40 grams of the coagulant and 160 grams of water were uniformly mixed and then mixed with a fine aggregate of 1,500 grams to form a concrete mixture. The fine aggregate has a water content of 6%. This kind