硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (5): 1682-1692.DOI: 10.16552/j.cnki.issn1001-1625.2025.1050
刘云霄(
), 汤正辉, 韩英博, 丁宜明, 周辉, 李晓光, 梁坤
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:
LIU Yunxiao(
), TANG Zhenghui, HAN Yingbo, DING Yiming, ZHOU Hui, LI Xiaoguang, LIANG Kun
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)。
中图分类号:
刘云霄, 汤正辉, 韩英博, 丁宜明, 周辉, 李晓光, 梁坤. 再生砖骨料在泡沫混凝土浆体中沉降规律研究[J]. 硅酸盐通报, 2026, 45(5): 1682-1692.
LIU Yunxiao, TANG Zhenghui, HAN Yingbo, DING Yiming, ZHOU Hui, LI Xiaoguang, LIANG Kun. Settlement Law of Recycled Brick Aggregate in Foamed Concrete Slurry[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(5): 1682-1692.
| Particle number | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Apparent density/(kg·m-3) | 1 956 | 2 045 | 1 810 | 1 905 | 1 892 |
表1 RBA表观密度测试结果
Table 1 Test results of apparent density of RBA
| Particle number | 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|---|
| Apparent density/(kg·m-3) | 1 956 | 2 045 | 1 810 | 1 905 | 1 892 |
| Sample No. | Density grade | Cement mass/kg | Water mass/kg | Foam volume/m3 | Dosage of water-reducing (mass fraction)/% | Density/(kg·m-3) |
|---|---|---|---|---|---|---|
| FCS-600 | A06 | 500 | 225 | 0.74 | 0.19 | 670 |
| FCS-800 | A08 | 667 | 300 | 0.58 | 0.15 | 880 |
| FCS-1000 | A10 | 833 | 375 | 0.43 | 0.09 | 1 100 |
| FCS-1200 | A12 | 1 000 | 450 | 0.27 | 0.07 | 1 320 |
| FCS-1400 | A14 | 1 166 | 525 | 0.12 | 0.06 | 1 590 |
| CP-1800 | — | 1 500 | 675 | 0.00 | 0.01 | 1 830 |
表2 配合比
Table 2 Mixture proportion
| Sample No. | Density grade | Cement mass/kg | Water mass/kg | Foam volume/m3 | Dosage of water-reducing (mass fraction)/% | Density/(kg·m-3) |
|---|---|---|---|---|---|---|
| FCS-600 | A06 | 500 | 225 | 0.74 | 0.19 | 670 |
| FCS-800 | A08 | 667 | 300 | 0.58 | 0.15 | 880 |
| FCS-1000 | A10 | 833 | 375 | 0.43 | 0.09 | 1 100 |
| FCS-1200 | A12 | 1 000 | 450 | 0.27 | 0.07 | 1 320 |
| FCS-1400 | A14 | 1 166 | 525 | 0.12 | 0.06 | 1 590 |
| CP-1800 | — | 1 500 | 675 | 0.00 | 0.01 | 1 830 |
| Sample No. | Yield stress/Pa | Plastic viscosity/(Pa·s) | R2 |
|---|---|---|---|
| FCS-600 | 7.19 | 0.23 | 0.998 |
| FCS-800 | 7.78 | 0.36 | 0.986 |
| FCS-1000 | 8.88 | 0.46 | 0.996 |
| FCS-1200 | 13.83 | 0.59 | 0.987 |
| FCS-1400 | 23.52 | 0.77 | 0.998 |
| CP-1800 | 9.52 | 0.32 | 0.994 |
表3 浆体流变参数
Table 3 Rheological parameters of slurry
| Sample No. | Yield stress/Pa | Plastic viscosity/(Pa·s) | R2 |
|---|---|---|---|
| FCS-600 | 7.19 | 0.23 | 0.998 |
| FCS-800 | 7.78 | 0.36 | 0.986 |
| FCS-1000 | 8.88 | 0.46 | 0.996 |
| FCS-1200 | 13.83 | 0.59 | 0.987 |
| FCS-1400 | 23.52 | 0.77 | 0.998 |
| CP-1800 | 9.52 | 0.32 | 0.994 |
| RBA diameter/mm | Settlement depth/mm | ||
|---|---|---|---|
| Method 1 | Method 2 | Simulation result | |
| 4.75 | 62 | 62 | 67 |
| 9.50 | 109 | 103 | 107 |
| 16.00 | 202 | 200 | 205 |
| 19.00 | 266 | 273 | 278 |
表4 模拟结果与试验结果对比
Table 4 Comparison between numerical simulation results and test results
| RBA diameter/mm | Settlement depth/mm | ||
|---|---|---|---|
| Method 1 | Method 2 | Simulation result | |
| 4.75 | 62 | 62 | 67 |
| 9.50 | 109 | 103 | 107 |
| 16.00 | 202 | 200 | 205 |
| 19.00 | 266 | 273 | 278 |
| Dumping height/m | Critical particle size/mm | |||||
|---|---|---|---|---|---|---|
| FCS-600 | FCS-800 | FCS-1000 | FCS-1200 | FCS-1400 | CP-1800 | |
| 1 | 16 | 19 | 28 | 39 | 54 | 33 |
| 2 | 15 | 18 | 26 | 32 | 44 | 26 |
| 3 | 14 | 17 | 24 | 29 | 37 | 22 |
表5 不同泡沫混凝土浆体中RBA颗粒的临界粒径
Table 5 Critical particle size of RBA in different foamed concrete slurry
| Dumping height/m | Critical particle size/mm | |||||
|---|---|---|---|---|---|---|
| FCS-600 | FCS-800 | FCS-1000 | FCS-1200 | FCS-1400 | CP-1800 | |
| 1 | 16 | 19 | 28 | 39 | 54 | 33 |
| 2 | 15 | 18 | 26 | 32 | 44 | 26 |
| 3 | 14 | 17 | 24 | 29 | 37 | 22 |
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