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Synthesis of polycarboxylate superplasticizer modified by β-cyclodextrin for possessing clay tolerance
Journal of Applied Polymer Science ( IF 2.7 ) Pub Date : 2021-11-16 , DOI: 10.1002/app.51918
Yue Li 1 , Hongwen Li 1 , Caiyun Jin 2 , Bingyin Zhao 3 , Yusheng Wu 4
Affiliation  

Polycarboxylate superplasticizer (PCE) is widely used in concrete, but the clay content in the aggregate is increasing at present, which seriously weakens the dispersing function of PCE. Therefore, in order to lower the sensitivity of PCE to the clay, urn:x-wiley:00218995:media:app51918:app51918-math-0001-cyclodextrin (β-CD) was used for synthesizing anti-clay polycarboxylate superplasticizers (AC-PCE). Firstly, the clay tolerance property of AC-PCE was explored by the fluidity and rheological test; then, the PCE was mixed with montmorillonite (MMT), and interaction mechanism was studied. The results showed that compared with the conventional polycarboxylate superplasticizer (CO-PCE), an increase of 19.5% and 14.9% was observed in the fluidity of cement paste and mortar for AC-PCE, indicating that the sensitivity of AC-PCE to the clay was lower than that of CO-PCE. Both CO-PCE and AC-PCE were adsorpted on MMT. XRD results showed that intercalation adsorption had occurred for both CO-PCE and AC-PCE. N2 adsorption results showed that although AC-PCE was also inserted into the interlayer of MMT, its adsorption amount was lower than that of CO-PCE due to steric hindrance from β-CD, which increased the sorption level of the AC-PCE on the cement clinkers particles. Therefore, the clay tolerance of PCE was enhanced significantly by β-CD.

中文翻译:

β-环糊精改性的耐粘土聚羧酸减水剂的合成

聚羧酸减水剂(PCE)在混凝土中应用广泛,但目前骨料中粘土含量不断增加,严重削弱了PCE的分散功能。因此,为了降低 PCE 对粘土的敏感性,骨灰盒:x-wiley:00218995:媒体:app51918:app51918-math-0001β-环糊精(β-CD)用于合成抗粘土聚羧酸减水剂(AC-PCE)。首先,通过流动性和流变试验探讨了AC-PCE的粘土耐受性;然后,将PCE与蒙脱石(MMT)混合,研究了相互作用机理。结果表明,与常规聚羧酸减水剂(CO-PCE)相比,AC-PCE的水泥浆体和砂浆流动性分别提高了19.5%和14.9%,表明AC-PCE对粘土的敏感性低于 CO-PCE。CO-PCE 和 AC-PCE 都吸附在 MMT 上。XRD结果表明,CO-PCE和AC-PCE均发生了插层吸附。氮2吸附结果表明,虽然AC-PCE也插入MMT的夹层,但由于β -CD的空间位阻作用,其吸附量低于CO-PCE ,增加了AC-PCE对水泥的吸附水平。熟料颗粒。因此, β -CD显着增强了PCE的粘土耐受性。
更新日期:2021-11-16
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