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本文研究了多糖类、有机酸及其盐类、磷酸盐3类常用缓凝剂对混凝土膨胀剂的限制膨胀率、抗压强度的影响,并研究了其对混凝土坍落度变化和拆模时间的影响。结果表明:3类缓凝剂对胶砂28d抗压强度均略有提高,多糖类缓凝剂对混凝土膨胀剂的胶砂限制膨胀率有明显降低,强度达10%~25%;有机酸类中葡萄糖酸钠、磷酸盐类缓凝剂对混凝土限制膨胀率、抗压强度均略有提高;掺0.07%葡萄糖酸钠混凝土14d限制膨胀率提高了10.7%,抗压强度提高了9.2%,对混凝土1h坍落度损失降低20mm,拆模时间影响不大,是与膨胀剂复合使用较理想的缓凝剂。
In this paper, the effects of polysaccharides, organic acids and their salts, and phosphate commonly used as retarders on the limiting expansion rate and compressive strength of concrete expanders were studied. The effects of sludging on concrete and demolding The impact of time. The results show that the compressive strength of mortar for 3 days is slightly higher than that for mortar for 28 days, and the limiting expansion of mortar for concrete expanders is obviously reduced by polysaccharide retarders with 10% ~ 25% strength. In the category of sodium gluconate, phosphate retarders limit the expansion rate of concrete, compressive strength are slightly increased; mixed with 0.07% sodium gluconate concrete 14d limit expansion rate increased by 10.7%, compressive strength increased by 9.2% 1h slump loss of concrete reduced by 20mm, mold release time has little effect, and expansive compound is used more ideal retarder.