再生混凝土粉掺量和细度对碱激发矿渣地聚物性能的影响

宋涛文; 林辉

doi:10.13204/j.gyjzG22112414

再生混凝土粉掺量和细度对碱激发矿渣地聚物性能的影响

doi: 10.13204/j.gyjzG22112414

宋涛文^1,2,
林辉³

1. 中冶建筑研究总院有限公司, 北京 100088;
2. 北京市工业建筑特种材料工程技术研究中心, 北京 100088;
3. 北京工业大学, 北京 100124

基金项目:

国家自然科学基金项目（52178263）；北京市科技新星计划项目（Z201100006820024）。

详细信息

作者简介:
宋涛文,男,1985年出生,硕士,高级工程师。电子信箱:xinqin29@126.com

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出版历程
- 收稿日期: 2022-11-24
- 网络出版日期: 2023-10-17

Effects of Content and Fineness of Recycled Concrete Powder on the Properties of Alkali Activated Slag Geopolymers

SONG Taowen^1,2,
LIN Hui³

1. Central Research Institute of Building and Construction Co., Ltd., MCC Group, Beijing 100088, China;
2. Beijing Engineering Research Center of Special Materials for Industrial Buildings, Beijing 100088, China;
3. Beijing University of Technology, Beijing 100124, China

摘要

摘要: 再生混凝土粉作为一种硅铝质废料在碱激发作用下具有一定的胶凝活性，以矿渣和再生混凝土粉为碱激发胶凝材料的前驱体，以氢氧化钠和水玻璃为碱性复合激发剂制备碱激发地聚物，研究了再生混凝土粉掺量和细度对碱激发矿渣地聚物流动性、凝结时间、抗压强度和抗折强度的影响。测试结果表明：再生混凝土粉有利于改善碱激发矿渣地聚物的流动性和延长凝结时间，其中粒度小于75 μm的再生混凝土粉对碱激发地聚物浆体的流动度略有削减，而对凝结时间的延长作用明显降低。再生混凝土粉有利于改善碱激发矿渣地聚物的抗压强度和抗折强度，其中混合再生混凝土粉掺量的增加有助于碱激发矿渣地聚物早期抗压抗折强度的提升，而不利于后期强度的发展。当粒度小于75 μm的再生混凝土细粉掺量为50%时，碱激发矿渣地聚物3，14，28 d抗压强度分别提升45.3%、28.3%和29.4%，其3，14，28 d抗折强度分别提升28.5%、50.9%和39.7%，其流动度为210 mm，初凝结时间为80 min。
- 再生混凝土粉 /
- 碱激发 /
- 矿渣 /
- 地聚物
Abstract: Recycled concrete powder, as a kind of silicoaluminate waste, has certain cementitious activity under alkali excitation. Therefore, slag and recycled concrete powder were used as precursors of alkali activated cementitious materials, and sodium hydroxide and sodium silicate were used as alkaline composite activators to prepare alkali activated geopolymer. The effects of content and fineness of recycled concrete powder on the fluidity, setting time, compressive strength and flexural strength of alkali activated slag geopolymer were studied. The test results showed that recycled concrete powder was beneficial to improving the fluidity of alkali activated slag geopolymer and prolonging the setting time, of which the particle size was less than 75 μm recycled concrete powder had a slight reduction in the fluidity of alkali activated geopolymer paste, but a significant reduction in the extension of setting time. Recycled concrete powder was conducive to improving the compressive strength and flexural strength of alkali activated slag geopolymer. The increase of mixed recycled concrete powder was conducive to the improvement of early compressive strength and flexural strength of alkali activated slag geopolymer, but not conducive to the development of late strength. In addition, when the content of recycled concrete fine powder with particle size is less than 75 μm was 50%, the compressive strengths of alkali-activated slag geopolymer at 3 d, 14 d, and 28 d increased of by 45.3%, 28.3%, and 29.4%, respectively, and its flexural strengths at 3 d, 14 d, and 28 d increased by 28.5%, 50.9%, and 39.7%, respectively, and its fluidity was 210 mm, and the initial setting time was 80 min.
- recycle concrete powder /
- alkali-activation /
- slag /
- geopolymer

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参考文献(12)

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