废弃线路板非金属粉对碱激发矿渣/粉煤灰胶凝材料性能的影响

摘要/Abstract

摘要： 内掺0%~25%(质量分数)废弃线路板非金属粉末(waste circuit board non-metallic powder, NMP),制备了一种新型碱激发矿渣/粉煤灰胶凝材料,测试了其力学强度、水化放热、物相组成和孔径分布,分析了其微结构特征。试验结果表明:掺入NMP不只降低了胶凝材料的累计放热,并且稍微降低了胶凝材料的7和28 d抗压强度;当NMP掺量小于15%(质量分数)时,因玻璃纤维的存在,胶凝材料28 d抗折强度与NMP掺量成正比,最高增幅达55.5%;掺入NMP降低了胶凝材料中孔径为100~1 000 nm的孔隙比例,增大了100 nm以下的微孔隙比例,且试件总孔隙率增加;NMP中的树脂颗粒与胶凝材料基体结合紧密并填充了纤维与基体之间的空隙,NMP的掺入不会影响原胶凝材料的水化产物类型。

关键词: 胶凝材料, 废弃线路板, 非金属粉末, 碱激发矿渣, 性能, 玻璃纤维, 资源再生

Abstract: A novel alkali-activated slag/fly ash cementitious material was prepared by incorporating 0%~25% (mass fraction) waste circuit board non-metallic powder (NMP). The properties of this new material were evaluated, including its mechanical strength, hydration heat release, phase composition, and pore size distribution. The microstructural features were also analyzed. The results indicate that the addition of NMP not only reduces the workability and cumulative heat release of cementitious material, but also slightly reduces its 7 and 28 d compressive strength. When the NMP content is less than 15% (mass fraction), the 28 d flexural strength of cementitious material is positively correlated with the NMP content due to the presence of glass fibers, resulting in a maximum increase of 55.5%. Incorporating NMP reduces the proportion of pores with diameter between 100 nm and 1 000 nm, while improving the proportion of micropores with diameter below 100 nm, leading to an overall increase in total porosity. The resin particles in NMP are tightly bound to the cementitious material matrix, filling the voids between the fibers and the matrix. The addition of NMP does not affect the types of hydration products in the original cementitious material.

Key words: cementitious material, waste circuit board, non-metallic powder, alkali-activated slag, property, glass fiber, resource regeneration

中图分类号:

TQ172

刘咏华, 胡新浪, 史立民, 高英力. 废弃线路板非金属粉对碱激发矿渣/粉煤灰胶凝材料性能的影响[J]. 硅酸盐通报, 2023, 42(12): 4456-4464.

LIU Yonghua, HU Xinlang, SHI Limin, GAO Yingli. Influence of Waste Circuit Board Non-Metallic Powder on Properties of Alkali-Activated Slag/Fly Ash Cementitious Material[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(12): 4456-4464.

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