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Combined effect of mineral admixtures with superplasticizers on the fluidity of the blended cement paste

机译：矿物掺合料与高效减水剂对掺合水泥浆流动性的综合影响

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摘要

The new concrete often incorporates several organic and mineral admixtures which interact with the various constituents of the cements and cause some problems of hardness and workability. In the present study, limestone cement (C1) and pozzolanic cement (C2) were used to make cement paste with two types of superplasticizer; SP1 based on polynaphthalene sulphonate (PNS); and SP2 based on resins mel-amines (PRM). Marsh cone test was adopted to check the combined effects of the following factors on the fluidity namely the type of cement, the type and the dosage of the superplasticizer, the type and the replacement rate of the mineral admixture and the water-cement ratio (W/C). The results of this work show that limestone cement presents a high fluidity with low loss after 1 h relatively to the pozzolanic cement within the saturation proportioning. Superplasticizer SP1 constitutes an incompatibility case when it is mixed with cement containing high C_3A or alkali content such as C2 cement. Also, limestone powder is found to be the best mineral admixture when it replaces a part of cement, where more fluidity is exhibited caused by the dilution effect.
机译：新混凝土通常掺入几种有机和矿物掺合料，它们与水泥的各种成分相互作用，并引起一些硬度和可加工性问题。在本研究中，使用石灰石水泥（C1）和火山灰水泥（C2）制备具有两种减水剂的水泥浆。基于聚萘磺酸盐（PNS）的SP1；以及基于树脂三聚氰胺（PRM）的SP2。采用沼泽锥试验来检验以下因素对流动性的综合影响，即水泥的类型，高效减水剂的类型和用量，矿物掺合料的类型和替代率以及水灰比（W）。 /C）。这项工作的结果表明，相对于火山灰水泥，在饱和配比下，石灰石水泥在1 h后呈现出高流动性和低损失。将超塑化剂SP1与C_3A或碱含量较高的水泥（如C2水泥）混合时，会构成不相容的情况。同样，发现石灰石粉代替水泥的一部分时，它是最佳的矿物掺合料，由于稀释作用，水泥显示出更多的流动性。

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