Chemically functionalized manufactured sand as the novel additive for enhancing the properties of cement-based composites.
Chemically functionalized manufactured sand as the novel additive for enhancing the properties of cement-based composites.
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DOI：
10.1039/d3ra00373f
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发表时间：
2023-03-08
期刊：
影响因子：
3.9
通讯作者：
Wang, Wenping
中科院分区：
文献类型：
--
作者：
Wo, Jiangang;Wang, Di;Zhang, Ting;Shi, Chengfang;Zhou, Zhengfa;Wang, Aiguo;Wang, Wenping
人工砂表面粗糙、级配差、团聚现象严重，限制了其在水泥基复合材料中的广泛应用。本文采用自由基聚合法合成了一种特殊设计的聚羧酸盐高效减水剂(PCE)装饰机制砂(AS-PCE)复合材料。用FTIR、TGA、XPS和SEM对AS-PCE复合材料进行了表征。AS表面的PCE负载量为∼12wt%。结果表明，AS-PCE能促进水泥水化反应，细化水泥基材料的微观结构，从而提高其机械强度。同时，由于AS-PCE所附带的聚羧酸盐高效减水剂的空间位阻效应，掺入1wt%As-PCE颗粒的水泥砂浆水化1h后的流动性提高了35%。AS-PCE还能显著提高砂浆的机械强度(特别是养护28d后抗折强度提高约25%)。这是由于AS-PCE具有良好的分散性、促进水泥水化反应和修复AS颗粒与胶凝材料之间的界面缺陷等协同作用的结果。该研究为AS在水泥基材料中的应用提供了一种很有前途的方法。将PCE接枝到人工砂上，制得分散性更好的颗粒，从而改善水泥基材料的性能。
The extensive applications of manufactured sand (AS) in cement-based composites were restricted because of its coarse surface texture, poor gradation and inevitable agglomeration. In this paper, a specifically designed polycarboxylate superplasticizer (PCE) decorated manufactured sand (AS-PCE) composite was synthesized via radical polymerization. The AS-PCE composite was characterized by FTIR, TGA, XPS and SEM. The load of PCE on the surface of AS was ∼12 wt%. Our results show that AS-PCE can promote cement hydration reaction and refine the microstructure of a cement-based material, thus, reinforcing its mechanical strength. Meanwhile, the fluidity of cement mortar with 1 wt% AS-PCE particles was increased by 35% after 1 h hydration, due to the steric hindrance effect provided by polycarboxylate superplasticizer affiliated with AS-PCE. The AS-PCE can also significantly enhance the mechanical strength (especially, the flexural strength was about 25% increased after curing for 28 days) of mortar. The excellent improvements result from the synergistic effects of AS-PCE including superb dispersibility, promotion of cement hydration reaction and the repair of interfacial defects between AS particles and the cementitious material. The research provides a promising method for the AS application in cement-based materials. The PCE was grafted onto manufactured sand to produce better dispersed particles, which can improve the performance of cement-based materials.
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影响因子：
10.5
作者：
Ma, Zhiming;Shen, Jiaxin;Wu, Huixia
通讯作者：
Wu, Huixia
影响因子：
10.5
作者：
Lv, S. H.;Deng, L. J.;Cui, Y. Y.
通讯作者：
Cui, Y. Y.
影响因子：
11.4
作者：
Minard, Hne;Garrault, Sandrine;Nonat, Andre
通讯作者：
Nonat, Andre
影响因子：
10.5
作者：
Kim, Kyoung-Min;Heo, Young-Sun;Lee, Jun
通讯作者：
Lee, Jun
DOI：
10.3390/ma14040769
发表时间：
2021-02-06
期刊：
Materials (Basel, Switzerland)
影响因子：
--
作者：
Muzyka R;Drewniak S;Pustelny T;Sajdak M;Drewniak Ł
通讯作者：
Drewniak Ł