脱硫石膏-废水泥碳化再生砌块的力学性能及机理

硅酸盐通报 ›› 2023, Vol. 42 ›› Issue (11): 4035-4041.

所属专题：资源综合利用

脱硫石膏-废水泥碳化再生砌块的力学性能及机理

刘明帝¹, 秦吉², 董晨¹, 朱颖²

1.徐州中煤汉泰建筑工业化有限公司,徐州 221001;
2.江苏省工程勘测研究院有限责任公司,扬州 225000

收稿日期:2023-06-16 修订日期:2023-08-28 出版日期:2023-11-15 发布日期:2023-11-22
作者简介:刘明帝(1985—),男,工程师。主要从事新型绿色建材、装配式建筑的研究。E-mail:lmd19851224@163.com
基金资助:
企业自研项目(ZMHT2022XM02)

Mechanical Properties and Mechanism of Desulphurized Gypsum-Waste Cement Carbonized Recycled Block

LIU Mingdi¹, QIN Ji², DONG Chen¹, ZHU Ying²

1. Xuzhou Zm-Hitec Construction Industrialization Co., Ltd., Xuzhou 221001, China;
2. Jiangsu Engineering Survey and Research Institute Co., Ltd., Yangzhou 225000, China

Received:2023-06-16 Revised:2023-08-28 Online:2023-11-15 Published:2023-11-22

摘要/Abstract

摘要： 本文以废水泥的再生利用为研究目标,构造了脱硫石膏-废水泥体系,评估了碳化对脱硫石膏-废水泥体系再生砌块力学性能和表观密度的影响,并通过XRD、FTIR和SEM揭示了再生砌块的成分、化学结构和形貌变化。结果表明,在石膏存在的条件下,废水泥的碳化可顺利进行。碳化过程能够有效增加脱硫石膏-废水泥样品的抗压强度。当水灰比为0.4、废水泥掺量为60%(质量分数)时,与未碳化的样品相比,碳化过程使样品的抗压强度提高了108.3%;当水灰比为0.8、废水泥掺量为65%(质量分数)时,与未碳化的样品相比,碳化过程使样品的抗压强度提高了270.0%。通过调整水灰比和废水泥掺量可控制碳化产物的化学结构和微观形貌,碳化过程对废水泥内部的水化具有一定促进作用,在促进体系力学性能增强的同时降低了块体的表观密度。研究结果将为综合利用废水泥和脱硫石膏两种固体废弃物提供新思路和可靠的再生应用方案。

关键词: 废水泥, 脱硫石膏, 碳化, 再生砌块, 碳酸钙

Abstract: In this paper, the recycling of waste cement is the research goal, a desulphurized gypsum-waste cement system was constructed, and the effect of carbonization on the mechanical properties and apparent density of the desulphurized gypsum-waste cement system was evaluated. The composition, chemical structure and morphology changes of the recycled blocks were revealed by XRD, FTIR and SEM. The results show that the carbonization of waste cement can proceed smoothly in the presence of gypsum. The carbonization process can effectively improve the compressive strength of desulphurized gypsum-waste cement samples. When the water-cement ratio is 0.4 and the waste cement content is 60% (mass fraction), the compressive strength of carbonized sample increases by 108.3% compared with that of the uncarbonized sample. When the water-cement ratio is 0.8 and the waste cement content is 65% (mass fraction), the compressive strength of carbonized sample increases by 270.0% compared with that of the uncarbonized sample. The chemical structure and microstructure of carbonized products can be controlled by adjusting water-cement ratio and waste cement content. The carbonization process can promote the hydration of waste cement, enhance the mechanical properties of the system, and reduce the apparent density of the block. The research results will provide a new idea and a reliable recycling scheme for the comprehensive utilization of waste cement and desulphurized gypsum.

Key words: waste cement, desulphurized gypsum, carbonization, recycled block, calcium carbonate

中图分类号:

TU522.1⁺9

刘明帝, 秦吉, 董晨, 朱颖. 脱硫石膏-废水泥碳化再生砌块的力学性能及机理[J]. 硅酸盐通报, 2023, 42(11): 4035-4041.

LIU Mingdi, QIN Ji, DONG Chen, ZHU Ying. Mechanical Properties and Mechanism of Desulphurized Gypsum-Waste Cement Carbonized Recycled Block[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(11): 4035-4041.

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脱硫石膏-废水泥碳化再生砌块的力学性能及机理

Mechanical Properties and Mechanism of Desulphurized Gypsum-Waste Cement Carbonized Recycled Block

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