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首页> 外文期刊>Construction and Building Materials >Investigation on the optimal chemical structure of methacrylate ester based polycarboxylate superplasticizers to be used as cement grinding aid under laboratory conditions: Effect of anionicity, side chain length and dosage on grinding efficiency, mortar workability and strength development
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Investigation on the optimal chemical structure of methacrylate ester based polycarboxylate superplasticizers to be used as cement grinding aid under laboratory conditions: Effect of anionicity, side chain length and dosage on grinding efficiency, mortar workability and strength development

机译:在实验室条件下研究用作水泥助磨剂的甲基丙烯酸酯基聚羧酸盐高效减水剂的最佳化学结构:阴离子性,侧链长度和用量对研磨效率,砂浆可加工性和强度发展的影响

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摘要

Using polycarboxylate ether/ester (PCE) superplasticizers as cement grinding aid presents an interesting concept because the PCE could provide both grinding and fluidizing effect at the same time, thus achieving two benefits from the admixture. Here, a systematic study on the relationship between the molecular structure of omega-methoxy poly(ethylene glycol) methacrylate ester based PCE (MPEG-PCE) and their grinding efficiency was performed. A series of MPEG-PCEs with systematically modified compositions was employed and their impact on grinding efficiency was assessed. First of all, the PCE dosage required to achieve a certain fineness in a laboratory ball mill was determined. Then, the grinding efficiency of PCEs exhibiting different anionic charge density and side chain length was investigated. It was found that an optimal molar ratio of carboxylic acid : side chain exists, and that shorter side chains are more beneficial for grinding efficiency than longer ones. Furthermore, it was also found that intergrinding of MPEG-PCEs with clinker produces a cement with higher fluidity. (C) 2019 Elsevier Ltd. All rights reserved.
机译:使用聚羧酸酯醚/酯(PCE)高效减水剂作为水泥助磨剂提出了一个有趣的概念,因为PCE可以同时提供助磨和流化作用,从而从混合料中获得两个好处。在此,系统研究了基于ω-甲氧基聚(乙二醇)甲基丙烯酸甲酯的PCE(MPEG-PCE)的分子结构与其研磨效率之间的关系。使用了一系列MPEG-PCE,它们的组成经过系统地修改,并评估了它们对研磨效率的影响。首先,确定在实验室球磨机中达到一定细度所需的PCE剂量。然后,研究了具有不同阴离子电荷密度和侧链长度的PCE的研磨效率。发现存在最佳的羧酸:侧链摩尔比,并且较短的侧链比较长的侧链更有利于研磨效率。此外,还发现,将MPEG-PCE与熟料相互研磨可产生具有更高流动性的水泥。 (C)2019 Elsevier Ltd.保留所有权利。

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