A study on the impact of different clay minerals on the dispersing force of conventional and modified vinyl ether based polycarboxylate superplasticizers
A study on the impact of different clay minerals on the dispersing force of conventional and modified vinyl ether based polycarboxylate superplasticizers
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DOI：
10.1016/j.cemconres.2014.02.009
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发表时间：
2014-06-01
影响因子：
11.4
通讯作者：
Plank, J.
中科院分区：
文献类型：
--
作者：
Lei, L.;Plank, J.
研究了蒙脱土、高岭石和白云母3种粘土矿物对乙烯基醚系四氯乙烯减水剂分散力的影响。首先，以马来酸酐（MA）、MA单甲氧基聚乙二醇酯和4-羟基丁基乙烯基醚（HBVE）为原料合成了一种常规的乙烯基醚型PCE。另外，通过在酯中用羟烷基取代MPEG来制备无PEG PCE。接下来，研究了三种不同的粘土矿物对掺有两种PCE的水泥浆体的流动性的影响。结果表明，粘土对常规PCE的影响顺序为：蒙脱石>>高岭石>白云母。而不含PEG的PCE仅受到轻微影响。研究表明，传统的PCE含有PEG合理容忍所有类型的粘土矿物，除了蒙脱石。当蒙脱石作为污染物存在时，则使用如本文所述的不含PEG的PCE提供了可行的缓解策略。(C)2014爱思唯尔有限公司版权所有。
The impact of three different clay minerals (montmorillonite, kaolinite and muscovite) on the dispersing force of vinyl-ether based PCE superplasticizers was studied. At first, a conventional vinyl-ether PCE was synthesized from maleic anhydride (MA), mono methoxy poly(ethylene glycol) ester of MA and 4-hydroxy butyl vinyl ether (HBVE). Additionally, a PEG-free PCE was prepared by substituting MPEG with hydroxyalkyl groups in the ester. Next, the effect of three different clay minerals on the fluidity of cement paste admixed with both PCEs was investigated. It was found that the conventional PCE is negatively affected by the clays in the order: montmorillonite >> kaolinite > muscovite. Whereas, the PEG-free PCEs were only slightly affected. The study suggests that conventional PCEs containing PEG reasonably tolerate all types of clay minerals except montmorillonite. When montmorillonite is present as a contaminant, then use of a PEG-free PCE such as described here presents a viable mitigation strategy. (C) 2014 Elsevier Ltd. All rights reserved.