钠钙膨润土对常规和改性磷酸盐聚羧酸减水剂在水泥砂浆中分散性能影响的研究,Langmuir

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钠钙膨润土对常规和改性磷酸盐聚羧酸减水剂在水泥砂浆中分散性能影响的研究
Langmuir ( IF 3.7 ) Pub Date : 2022-04-30 , DOI: 10.1021/acs.langmuir.2c00408
Hui Feng ₁ , Yucheng Mao _{2,

3} , Zhongjun Feng _{2,

3} , Zuiliang Deng _{2,

3} , Baicun Zheng ₁

Affiliation

通过分子结构设计，采用异戊二烯氧基聚乙二醇醚（TPEG）、丙烯酸和甲基丙烯酸羟乙酯磷酸酯共聚合成了改性聚羧酸减水剂（PCE）。TPEG-PCEs 被选为含钠/钙-膨润土的水泥砂浆的潜在分散剂。其他两种基于甲基烯丙基醚（HPEG）和乙二醇单乙烯基聚乙二醇（EPEG）作为大分子单体获得的商业PCE也应用于砂浆中。研究了膨润土种类、用量、PCEs单体结构和水泥种类对含膨润土砂浆分散性能的影响。根据研究结果，当使用两种膨润土时，砂浆的初始流动性降低了约 20 毫米。施用 3% Ca-膨润土导致 1 小时后砂浆中的流动损失为 40%。The fluidity of the mortar with Na-bentonite exhibited lower dispersion ability than that with Ca-bentonite when HPEG-PCE and EPEG-PCE were chosen as dispersants. TPEG-PCE 表现出优于 HPEG-PCE 和 EPEG-PCE 的分散性能，对水泥具有缓凝作用，对粘土含量的敏感性也较弱。因此，具有磷酸基团的 TPEG-PCE 是传统 PCE 的可行替代品。对粘土含量也很敏感。因此，具有磷酸基团的 TPEG-PCE 是传统 PCE 的可行替代品。对粘土含量也很敏感。因此，具有磷酸基团的 TPEG-PCE 是传统 PCE 的可行替代品。

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Study on the Impact of Na/Ca Bentonites on the Dispersion Performance of Conventional and Modified Phosphate Polycarboxylate Superplasticizers in Cement Mortar

Through molecular structure design, modified polycarboxylate superplasticizers (PCEs) were synthesized via copolymerization using isoprenyl oxy poly(ethylene glycol) ether (TPEG), acrylic acid, and hydroxyethyl methacrylate phosphate. TPEG-PCEs were selected as potential dispersants for Na/Ca-bentonite containing cement mortar. Other two kinds of commercial PCE that were obtained based on methallyl ether (HPEG) and ethylene-glycol monovinyl polyethylene glycol (EPEG) as macromonomers were also applied in the mortar. The effects of the type of bentonite and its dosage, as well as the monomer structure of PCEs and the type of cement, on the dispersion properties of the bentonite-containing mortar were studied. According to the findings, the initial fluidity of the mortar was reduced by about 20 mm when two kinds of bentonite were used. Applying 3% Ca-bentonite resulted in 40% flow loss in the mortar after 1 h. The fluidity of the mortar with Na-bentonite exhibited lower dispersion ability than that with Ca-bentonite when HPEG-PCE and EPEG-PCE were chosen as dispersants. The TPEG-PCE exhibited superior dispersing performance over HPEG-PCE and EPEG-PCE and exerted a retarding effect on cement, being also weakly sensitive to clay content. Thus, TPEG-PCEs with phosphate groups present a viable alternative to conventional PCEs.

更新日期：2022-04-30

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