固化建筑渣土力学和路用性能试验研究

硅酸盐通报 ›› 2024, Vol. 43 ›› Issue (11): 4261-4269.

• 道路材料 • 上一篇

固化建筑渣土力学和路用性能试验研究

郭少华¹, 詹世佐¹, 康天蓓², 丁向群³, 王凤池⁴

1.辽宁省交通规划设计院有限责任公司,沈阳 110168;
2.沈阳建筑大学土木工程学院,沈阳 110168;
3.沈阳建筑大学材料科学与工程学院,沈阳 110168;
4.沈阳建筑大学交通与测绘工程学院,沈阳 110168

收稿日期:2024-05-30 修订日期:2024-07-05 出版日期:2024-11-15 发布日期:2024-11-21
通信作者: 王凤池,博士,教授。E-mail:cefcwang@sjzu.edu.cn
作者简介:郭少华(1990—),男,高级工程师。主要从事路面工程相关技术与材料研究。E-mail:guoshaohuaji@126.com
基金资助:
辽宁省中央引导地方科技发展专项(2023JH6/100100018);辽宁交通科技项目(202233);国家自然科学基金(51578348);辽宁省教育厅基本科研面上项目(JYTMS20231578)

Experimental Study on Mechanical Properties and Road Properties of Solidified Construction Waste Soil

GUO Shaohua¹, ZHAN Shizuo¹, KANG Tianbei², DING Xiangqun³, WANG Fengchi⁴

1. Liaoning Provincial Transportation Planning and Design Institute Co., Ltd, Shenyang 110168, China;
2. School of Civil Engineering, Shengyang Jianzhu University, Shenyang 110168, China;
3. School of Materials Science and Engineering, Shenyang Jianzhu University, Shenyang 110168, China;
4. School of Transportation and Geomatics Engineering, Shenyang Jianzhu University, Shenyang 110168, China

Received:2024-05-30 Revised:2024-07-05 Published:2024-11-15 Online:2024-11-21

摘要/Abstract

摘要： 为解决建筑渣土处置难、堆弃难、资源化程度低等问题,本文提出采用固化剂固化建筑渣土。本文对比分析了水泥掺量、固化剂掺量、养护龄期对固化建筑渣土无侧限抗压强度、劈裂抗拉强度、水稳性、抗冻融性能、抗干缩性能的影响规律,并通过SEM和XRD试验结果分析了固化剂协同水泥固化的固化机理。结果表明,当水泥质量掺量为7%且固化剂质量掺量为3%时,固化建筑渣土28 d无侧限抗压强度为6.91 MPa、劈裂抗拉强度为0.98 MPa、水稳系数91.52%,较水泥质量掺量为10%的对比件分别增加15.7%、31.2%和12.2%;固化剂的掺入具有提高水泥固化土抗干缩性能的作用;冻融循环10次后,固化建筑渣土试件较水泥固化对比试件质量损失率降低44.6%,残余强度增加34.9%。固化剂协同水泥水化反应生成的C-S-H和C-A-H胶凝物质使土颗粒团聚成团粒结构,形成网络骨架提供强度;固化剂中的SiO₂、Al₂O₃减小了土颗粒间的自由水和吸附水含量,加入固化剂后固化土的强度和路用性能得到增强和改善。研究结果为固化建筑渣土在路基中的应用提供理论基础。

关键词: 建筑渣土, 固化剂, 无侧限抗压强度, 水稳性能, 抗冻融性能, 固化机理

Abstract: In order to solve the problems of difficult treatment of construction residue and low degree of resource utilization, this paper proposes to use a curing agent to solidify construction residue. In this paper, the effects of cement content, curing agent content, and curing age on the unconfined compressive strength, splitting tensile strength, water stability, freeze-thaw resistance, and dry shrinkage resistance of solidified soil were analyzed, and the curing mechanism of co-curing agent and cement was revealed by SEM and XRD tests. The results show that, when the cement content is 7%, and the content of curing agent is 3%, the unconfined compressive strength of solidified soil residue is 6.91 MPa, the splitting tensile strength is 0.98 MPa, and the hydraulic stability coefficient is 91.52% for 28 d, compared with cement curing, which increases by 15.7%, 31.2% and 12.2%, respectively. The incorporation of the curing agent has the effect of improving the dry shrinkage resistance of solidified soil. After 10 freeze-thaw cycles, the mass loss rate of solidified soil decreases by 44.6% and the residual strength increases by 34.9% compared with that of cement cured specimens. The C-S-H and C-A-H cementitious substances generated by the cement hydration reaction of the curing agent make the soil particles agglomerate into a granular structure and form a network skeleton to provide strength. The SiO₂ and Al₂O₃ in the curing agent reduce the content of free water and adsorbed water between the soil particles, and the strength and road performance of the solidified soil is enhanced and improved after the addition of the curing agent. The results of the study provide a theoretical basis for the application of cured construction residue soil in roadbeds.

Key words: construction waste soil, curing agent, unconfined compressive strength, water stability performance, freeze thaw resistance, curing mechanism

中图分类号:

U414

郭少华, 詹世佐, 康天蓓, 丁向群, 王凤池. 固化建筑渣土力学和路用性能试验研究[J]. 硅酸盐通报, 2024, 43(11): 4261-4269.

GUO Shaohua, ZHAN Shizuo, KANG Tianbei, DING Xiangqun, WANG Fengchi. Experimental Study on Mechanical Properties and Road Properties of Solidified Construction Waste Soil[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2024, 43(11): 4261-4269.

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固化建筑渣土力学和路用性能试验研究

Experimental Study on Mechanical Properties and Road Properties of Solidified Construction Waste Soil

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