欢迎访问《硅酸盐通报》官方网站,今天是

硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1682-1692.DOI: 10.16552/j.cnki.issn1001-1625.2025.1050

• 资源综合利用 • 上一篇    下一篇

再生砖骨料在泡沫混凝土浆体中沉降规律研究

刘云霄(), 汤正辉, 韩英博, 丁宜明, 周辉, 李晓光, 梁坤   

  1. 长安大学建筑工程学院,西安 710061
  • 收稿日期:2025-10-29 修订日期:2025-11-30 出版日期:2026-05-15 发布日期:2026-06-10
  • 作者简介:刘云霄(1976—),女,博士,正高级工程师。主要从事绿色建筑材料及其在结构工程中应用的研究。E-mail:liuyunxiao@chd.edu.cn
  • 基金资助:
    陕西省重点研发计划项目(2024SF-YBXM-608)

Settlement Law of Recycled Brick Aggregate in Foamed Concrete Slurry

LIU Yunxiao(), TANG Zhenghui, HAN Yingbo, DING Yiming, ZHOU Hui, LI Xiaoguang, LIANG Kun   

  1. School of Civil Engineering,Chang’an University,Xi’an 710061,China
  • Received:2025-10-29 Revised:2025-11-30 Published:2026-05-15 Online:2026-06-10

摘要:

将泡沫混凝土用作台背回填材料能够解决“桥头跳车”问题,而在泡沫混凝土中抛入再生砖骨料(recycled brick aggregate, RBA),可以降低泡沫混凝土水化热并节约成本,且施工工艺简单。但不同粒径的RBA颗粒抛入后在泡沫混凝土中的沉降规律尚不明确,为保证工程质量,本文利用有限元分析软件建立沉降模型,模拟了RBA颗粒在泡沫混凝土浆体中的沉降情况,分析了浆体流变学参数、骨料粒径及抛填高度对颗粒沉降的影响。发现当颗粒在浆体中运动时,若假定浆体无限深,颗粒的最终运动状态与抛填高度无关,浆体的屈服应力决定了颗粒是持续沉降还是悬浮于浆体中,而塑性黏度则决定了颗粒的最终沉降速度。通过测试浆体的密度和屈服应力,可以确定能够沉降到浆体底部的RBA的最小粒径。为方便在实际工程中应用,本文给出了抛填高度在1~3 m,五种泡沫混凝土浆体RBA的临界粒径(能够持续沉降至底部的最小粒径)。

关键词: 泡沫混凝土, 再生砖骨料, 抛填, 流变参数, 沉降, 数值模拟

Abstract:

Using foamed concrete for back-filling effectively resolves the issue of "vehicle bumping at bridgeheads". However, this method is associated with high costs and significant hydration heat release. Incorporating recycled brick aggregate (RBA) into foamed concrete as a dumped rip-rap concrete not only simplifies the construction process, but also reduces the hydration heat of foamed concrete and lowers costs. Nevertheless, it remains uncertain whether RBA particles of varying sizes will continue to settle to the bottom of foamed concrete slurry, which may potentially compromise the quality of the back-filling construction. In this study, finite element analysis software was utilized to develop a settlement model for simulating the settling behavior of RBA particles in foamed concrete. Furthermore, the effects of rheological parameters, RBA size, and dumping height were systematically examined. As particles move through a slurry, the final motion state of the particles is independent of the dumping height in an infinitely deep slurry. Yield stress of the slurry determines whether the particles are continuously settling or hovering in the slurry, while plastic viscosity dictates the terminal settling velocity. The minimum particle size of RBA that can settle to the bottom of the slurry can be determined by testing the density and yield stress of the slurry. To facilitate engineering applications, the critical particle size—the smallest particle size can settle to the bottom— of RBA in the five types of foamed concrete slurries at dumping heights ranging from 1 m to 3 m is presented.

Key words: foamed concrete, recycled brick aggregate, dump, rheological parameter, settlement, numerical simulation

中图分类号: