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本文通过水泥胶砂流动度、水泥胶砂强度及水泥水化温升速率测定试验得出以下结论:混凝土减胶剂(记为:CRA)具有微弱的分散作用,在分别与聚羧酸减水剂、萘系高效减水剂及脂肪族高效减水剂混合使用时能够提升三种减水剂的分散效果,其中,对萘系高效减水剂分散效果的提升作用尤为明显。另一方面,随着CRA掺量的增加,其对水泥胶砂强度的增强作用越加明显,与三种高效减水剂混合使用时能提高水泥胶砂28d抗压强度。这些结果表明,CRA与三种减水剂的适应性良好。水泥水化温升速率测试结果表明,随着CRA掺量的增加,水泥早期水化被不断延缓,但1d内水化放热量相当,即水泥水化程度相当,因此CRA对胶砂强度的增强作用可能是由于其对水泥浆体内部结构的优化所致。
In this paper, fluidity of cement mortar, cement mortar strength and cement hydration temperature rate test results obtained the following conclusions: Concrete cementing agent (CRA) has a weak dispersion, respectively, with polycarboxylate water reduction Agent, naphthalene superplasticizer and aliphatic superplasticizer can improve the dispersion effect of the three superplasticizers. Among them, the effect of enhancing the dispersion of naphthalene superplasticizer is especially obvious. On the other hand, with the increase of CRA content, the reinforcing effect on the strength of cement mortar becomes more obvious. When mixed with three superplasticizers, the compressive strength of cement mortar can be increased 28 d. These results show that CRA and three superplasticizer good adaptability. The test results of cement hydration rate show that with the increase of the content of CRA, the early hydration of cement is delayed, but the hydration exotherm is equal within 1d, that is, the degree of cement hydration is quite high, so the strength of CRA is enhanced The effect may be due to its optimization of the internal structure of cement paste.