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硅酸盐通报 ›› 2021, Vol. 40 ›› Issue (11): 3644-3653.

• 资源综合利用 • 上一篇    下一篇

钛石膏基可控低强度材料强度及体积稳定性研究

朱浩泽1, 于峰泉2, 耿健3, 王向阳3, 秦华彬3   

  1. 1.浙江大学建筑工程学院,杭州 311500;
    2.宁波市轨道交通集团有限公司,宁波 315100;
    3.浙大宁波理工学院,宁波 315100
  • 收稿日期:2021-04-28 修回日期:2021-05-26 出版日期:2021-11-15 发布日期:2021-12-08
  • 通讯作者: 耿健,博士,教授。E-mail:gengjian@nbt.edu.cn
  • 作者简介:朱浩泽(1994—),男,硕士研究生。主要从事固体废弃物资源化利用研究。E-mail:2993231711@qq.com
  • 基金资助:
    浙江省自然科学基金(Y17E080072);宁波市自然科学基金(2019A610392);国家级大学生创新创业训练项目(202113022040)

Strength and Volume Stability of Controlled Low-Strength Material Based on Titanium Gypsum

ZHU Haoze1, YU Fengquan2, GENG Jian3, WANG Xiangyang3, QIN Huabin3   

  1. 1. College of Civil Engineering and Architecture, Zhejiang University, Hangzhou 311500, China;
    2. Ningbo Rail Transit Group, Ningbo 315100, China;
    3. NingboTech University, Ningbo 315100, China
  • Received:2021-04-28 Revised:2021-05-26 Online:2021-11-15 Published:2021-12-08

摘要: 为了解决钛石膏综合利用率低、消耗不足以及道路回填工程中传统回填不密实或存在结构死角的问题,以钛石膏为原料制备钛石膏基可控低强度材料(CLSM)。采用无侧限抗压强度试验方法和体积稳定性试验方法,研究了建筑渣土取代率、水固比、钛石膏掺量与激发剂掺量等因素对CLSM抗压强度和体积稳定性的影响,并通过XRD、SEM对其性能变化的原因进行分析。试验结果表明:CLSM早期强度随着建筑渣土取代率的增加而增大,但是膨胀率有所下降;增大水固比则会降低强度,膨胀率随之增加;而增大钛石膏掺量,CLSM的强度与膨胀率均会降低,当钛石膏掺量为70%(质量分数)时,CLSM体积呈收缩趋势,且在14 d时收缩率基本达到最大,而生石灰掺量的增加,则会改善CLSM的收缩,起到一定的补偿收缩作用。

关键词: 钛石膏, 可控低强度材料, 建筑渣土, 无侧限抗压强度, 体积稳定性

Abstract: A new type of cementless titanium gypsum-based controlled low-strength material (CLSM) was proposed to solve the problems of low comprehensive utilization and insufficient consumption of titanium gypsum and poor compaction in road projects. The unconfined compressive strength test method and volume stability test method were used to study the effects of construction waste soil replacement rate, water-solid ratio, titanium gypsum content and activator content on the compressive strength and volume stability of CLSM, and the reasons for the properties changes through XRD and SEM were explored. The results show that the early strength of CLSM increases with the increase of the replacement of construction waste soil, but the expansion rate decreases. Increasing the water-solid ratio reduces the strength, and the expansion rate increases accordingly. However, increasing the content of titanium gypsum reduces the strength and expansion rate of CLSM. When the content of titanium gypsum is 70% (mass fraction), the volume of CLSM tends to shrink, and the shrinkage rate basically reaches the maximum at 14 d. The increase of the amount of quicklime improves the shrinkage of CLSM and plays a certain role in compensating for shrinkage.

Key words: titanium gypsum, controlled low-strength material, construction waste soil, unconfined compressive strength, volume stability

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