Muscovite is a common harmful mineral in manufactured sand, and has always led to the poor compatibility of superplasticizers in fresh concrete. Currently, the failure mechanism is usually explained by competitive adsorption and interlayer adsorption. In addition to the adsorption point of view, as a kind of surfactant, the self-aggregation conformation of superplasticizers in solutions also requires attention. This study explored the compatibility of polycarboxylate superplasticizer (PCE) in cement paste containing muscovite and explained the failure mechanism from the PCE aggregation point of view. Results showed that at the saturated dosage of PCE (0.14 wt%), the introduction of 6 wt% muscovite resulted in a complete loss of fluidity. In the pore solution of cement paste blended with muscovite, the PCE exhibited a lower critical micelle concentration (CMC) and larger aggregation size. The aggregation of PCE is due to the high ionic concentration in cement paste with muscovite, which increases the hydrophobic interaction between PCE and counter ion.

中文翻译：

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通过聚集机制揭示聚羧酸减水剂（PCE）在白云母混合水泥浆体中的相容性


白云母是机制砂中常见的有害矿物，一直导致高效减水剂在新拌混凝土中的相容性较差。目前，失效机理通常用竞争吸附和层间吸附来解释。除了吸附角度外，作为一种表面活性剂，高效减水剂在溶液中的自聚集构象也需要关注。本研究探讨了聚羧酸减水剂（PCE）在含有白云母的水泥浆体中的相容性，并从 PCE 聚集的角度解释了其破坏机制。结果表明，在 PCE 饱和剂量（0.14 wt%）下，引入 6 wt% 白云母会导致流动性完全丧失。在掺有白云母的水泥浆体孔隙溶液中，PCE表现出较低的临界胶束浓度（CMC）和较大的聚集尺寸。 PCE的聚集是由于水泥浆中含有白云母的高离子浓度，这增加了PCE与抗衡离子之间的疏水相互作用。