Adsorption of organic core-shell corrosion inhibitors on cement particles and their influence on early age properties of fresh cement paste
Adsorption of organic core-shell corrosion inhibitors on cement particles and their influence on early age properties of fresh cement paste
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有机核壳缓蚀剂在水泥颗粒上的吸附及其对新拌水泥浆体早期性能的影响
DOI：
10.1016/j.cemconres.2020.106000
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发表时间：
2020
影响因子：
11.4
通讯作者：
Wei J.
中科院分区：
文献类型：
--
作者：
Zhu Y.;Ma Y.;Hu J.;Zhang Z.;Huang J.;Wang Y.;Wang H.;Cai W.;Huang H.;Yu Q.;Wei J.
共聚物对水泥基材料性能的影响与其在水泥基质中的吸附和分布密切相关。研究了以聚氧乙烯-b-聚苯乙烯(PEO-b-PS)胶束为基团的有机核壳缓蚀剂在水泥颗粒上的吸附行为及其对水泥浆体早期水化和易性的影响。结果表明，胶束在40℃左右迅速吸附在水泥颗粒表面；在细观尺度上，胶束在水泥基质中分布均匀；在微观尺度上，胶束优先吸附在带正电的铝酸盐相上。由于有效的吸附作用，阻碍了颗粒的溶解和水化产物的析出，导致C3A早期水化略有延缓；水泥浆体的和易性得到改善，这归因于水泥颗粒表面电位的改变和胶束提供的空间位阻效应使水泥颗粒更好地分散。
The influence of copolymers on the material properties of cement-based materials is closely related to their adsorption and distribution in cement matrix. In this study, the adsorption of organic core-shell corrosion inhibitors based on poly(ethylene oxide)-b-polystyrene (PEO-b-PS) micelles on cement particles and their influence on the early age hydration and workability of cement paste were investigated. The results showed that the micelles rapidly adsorbed on cement particles surface within 40 s. At mesoscale, the micelles distribution was uniform in cement matrix; at microscale they were preferentially adsorbed on positively charged aluminates phases. Due to the efficient adsorption, the particle dissolution and precipitation of hydration products were impeded, leading to the slightly retarded early hydration of C3A; the workability of cement paste was improved, which was attributed to the better dispersion of cement particles associated with the altered surface potential of cement particles and steric hindrance effect provided by the micelles.