水泥浆拌和固化二氧化碳对水泥性能的影响

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (9): 3109-3117.

• 水泥混凝土 • 下一篇

水泥浆拌和固化二氧化碳对水泥性能的影响

王亚丽^1,2, 赵馨宇¹, 蒙万友¹, 王梦璐¹, 张萌¹

1.北京工业大学材料科学与工程学院,北京 100124;
2.工业大数据应用技术国家工程实验室,北京 100124

收稿日期:2024-02-20 修订日期:2024-04-21 出版日期:2024-09-15 发布日期:2024-09-19
作者简介:王亚丽(1978—),女,博士,教授。主要从事生态环境材料、水泥水化与水泥基材料、固体废弃物建材资源化方面的研究。E-mail:wangyali1978@bjut.edu.cn
基金资助:
北京市科技计划(Z221100007522002)

Effect of Cement Paste Mix Sequestration Carbon Dioxide on Cement Properties

WANG Yali^1,2, ZHAO Xinyu¹, MENG Wanyou¹, WANG Menglu¹, ZHANG Meng¹

1. College of Materials Science and Engineering, Beijing University of Technology, Beijing 100124, China;
2. National Engineering Laboratory of Industrial Large Data Application Technology, Beijing 100124, China

Received:2024-02-20 Revised:2024-04-21 Published:2024-09-15 Online:2024-09-19

摘要/Abstract

摘要： 为研究水泥浆拌和固化二氧化碳对水泥性能的影响,将不同状态二氧化碳以不同掺量加入新拌水泥,测试水泥浆的固碳效果和强度,并采用TG-DTG、MIP、SEM等表征方法,探究二氧化碳对水泥浆体强度和微观结构的影响机理。结果表明,当水灰比为0.50、气态二氧化碳掺量为1.5%(质量分数)时,水泥的抗压强度和二氧化碳固化效果最佳,3、7 d抗压强度提升100%,28 d抗压强度提升139.6%。掺入二氧化碳后,100～600 nm的孔几乎消失,100 nm以下的孔明显增多,水泥内部的有害孔减少,水泥硬化浆体内部孔结构得到改善。二氧化碳加速水泥早期水化反应,水化产物的生长状态和结合方式得到优化,实现水泥基材料的固碳强化。

关键词: 新拌水泥浆, 二氧化碳, 固碳量, 抗压强度, 水灰比

Abstract: In order to study effect of cement paste mix sequestration carbon dioxide on cement properties, different states and dosages of carbon dioxide were added to fresh cement paste. The carbon sequestration effect and mechanical properties of fresh cement paste were tested, and characterization methods such as TG-DTG, MIP, SEM were used to explore the effect of carbon dioxide on strength and microstructure of cement. The results show that when the water-cement ratio is 0.50, gas state carbon dioxide dosage is 1.5% (mass fraction), the compressive strength and carbon sequestration effect of cement are optimal. The compressive strength increases by 100% at 3 and 7 d, and by 139.6% at 28 d. After adding carbon dioxide, pores with diameters between 100~600 nm almost disappear while pores below 100 nm significantly increase, effectively reducing harmful pores inside cement matrix and enhancing pore structure in hardened cement paste. Carbon dioxide is directly accelerating cement early hydration. The growth state and bonding mode of hydration products are optimized to achieve carbon sequestration and strengthening of cement-based materials.

Key words: fresh cement paste, carbon dioxide, carbon sequestration dosage, compressive strength, water-cement ratio

中图分类号:

TQ172

王亚丽, 赵馨宇, 蒙万友, 王梦璐, 张萌. 水泥浆拌和固化二氧化碳对水泥性能的影响[J]. 硅酸盐通报, 2024, 43(9): 3109-3117.

WANG Yali, ZHAO Xinyu, MENG Wanyou, WANG Menglu, ZHANG Meng. Effect of Cement Paste Mix Sequestration Carbon Dioxide on Cement Properties[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(9): 3109-3117.

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水泥浆拌和固化二氧化碳对水泥性能的影响

Effect of Cement Paste Mix Sequestration Carbon Dioxide on Cement Properties

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