硅酸盐通报 ›› 2026, Vol. 45 ›› Issue (9): 3233-3244.DOI: 10.16552/j.cnki.issn1001-1625.2026.0345
康天蓓1,2,3(
), 高铭睿1, 丁向群4, 李艳凤5, 王凤池3,5(
)
收稿日期:2026-04-16
修订日期:2026-05-14
出版日期:2026-09-15
发布日期:2026-10-09
通信作者:
王凤池,博士,教授。 E-mail:cefcwang@sjzu.edu.cn作者简介:康天蓓(1987—),女,博士,副教授。主要从事再生混凝土力学与耐久性能方面的研究。 E-mail:kangtianbei@sjzu.edu.cn
基金资助:
KANG Tianbei1,2,3(
), GAO Mingrui1, DING Xiangqun4, LI Yanfeng5, WANG Fengchi3,5(
)
Received:2026-04-16
Revised:2026-05-14
Published:2026-09-15
Online:2026-10-09
摘要:
为改善再生混凝土的力学与变形性能,本文提出了采用碳酸钙晶须(CCW)增强再生骨料(RCA)和水泥基体两种方法,系统对比研究了两种增强方法对再生混凝土抗压强度、应力-应变关系、抗收缩性能和徐变性能的影响规律及作用机理。结果表明,RCA增强法较优处理方案为采用浓度为3%(质量分数)的CCW悬浮液浸泡2 d,水泥基体增强法较优处理方案为CCW体积掺量2%。在较优处理方案下,与未增强的试件相比,RCA增强法和水泥基体增强法使试件峰值应力分别增加8.6%和6.3%,RCA增强法可显著改善再生混凝土的刚度与强度,而水泥基体增强法则更利于提高峰值后延性;7 d收缩应变分别降低35.7%和13.5%,90 d收缩应变分别降低13.2%和8.1%;在90%和95%应力水平下,徐变破坏时间分别延长22.5%、9.9%和78.6%、35.7%;在85%应力水平下持载80 d时,徐变变形分别降低23.5%和19.8%。微观分析表明,CCW既能填充孔隙、桥接裂纹,又能通过表面吸附诱导游离Ca2+成核、加速水化产物生成,从而强化RCA表面附着的老旧砂浆和界面过渡区。
中图分类号:
康天蓓, 高铭睿, 丁向群, 李艳凤, 王凤池. 碳酸钙晶须双相增强再生混凝土力学与变形性能研究[J]. 硅酸盐通报, 2026, 45(9): 3233-3244.
KANG Tianbei, GAO Mingrui, DING Xiangqun, LI Yanfeng, WANG Fengchi. Mechanical and Deformation Properties of Calcium Carbonate Whisker Biphasic Reinforced Recycled Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2026, 45(9): 3233-3244.
| Type | Apparent density/(kg·m-3) | Gradation/mm | Water content/% | Water absorption rate/% | Crushing index/% |
|---|---|---|---|---|---|
| NCA | 2 750 | 5~25 | 0.26 | 0.97 | 8.8 |
| RCA | 2 660 | 5~25 | 3.93 | 7.64 | 17.7 |
表1 粗骨料的物理力学性能
Table 1 Physical and mechanical properties of coarse aggregates
| Type | Apparent density/(kg·m-3) | Gradation/mm | Water content/% | Water absorption rate/% | Crushing index/% |
|---|---|---|---|---|---|
| NCA | 2 750 | 5~25 | 0.26 | 0.97 | 8.8 |
| RCA | 2 660 | 5~25 | 3.93 | 7.64 | 17.7 |
| Density/(g·cm-3) | Length/mm | Diameter/μm | L/D | Elasticity modulus/GPa | Tensile strength/MPa | pH value |
|---|---|---|---|---|---|---|
| 2.86 | 0.01~0.02 | 0.5~1.0 | 10~40 | 410~710 | 3 000~6 000 | 9.0~9.5 |
表2 CCW的物理性能
Table 2 Physical performance of CCW
| Density/(g·cm-3) | Length/mm | Diameter/μm | L/D | Elasticity modulus/GPa | Tensile strength/MPa | pH value |
|---|---|---|---|---|---|---|
| 2.86 | 0.01~0.02 | 0.5~1.0 | 10~40 | 410~710 | 3 000~6 000 | 9.0~9.5 |
| Sample No. | CCW content% | Mix proportion/(kg·m-3) | ||||
|---|---|---|---|---|---|---|
| Cement | Sand | RCA | NCA | Water | ||
| NC | 0 | 500 | 660 | 0 | 990 | 250.00 |
| RC50 | 0 | 500 | 660 | 495 | 495 | 264.85 |
| RC100 | 0 | 500 | 660 | 990 | 0 | 279.70 |
| RC50C1 | 1 | 500 | 660 | 495 | 495 | 264.85 |
| RC50C2 | 2 | 500 | 660 | 495 | 495 | 264.85 |
| RC50C3 | 3 | 500 | 660 | 495 | 495 | 264.85 |
表3 混凝土配合比
Table 3 Mix proportion of concrete
| Sample No. | CCW content% | Mix proportion/(kg·m-3) | ||||
|---|---|---|---|---|---|---|
| Cement | Sand | RCA | NCA | Water | ||
| NC | 0 | 500 | 660 | 0 | 990 | 250.00 |
| RC50 | 0 | 500 | 660 | 495 | 495 | 264.85 |
| RC100 | 0 | 500 | 660 | 990 | 0 | 279.70 |
| RC50C1 | 1 | 500 | 660 | 495 | 495 | 264.85 |
| RC50C2 | 2 | 500 | 660 | 495 | 495 | 264.85 |
| RC50C3 | 3 | 500 | 660 | 495 | 495 | 264.85 |
| Age/d | Factor | Quadratic sum | Degree of freedom | MSE | F | P |
|---|---|---|---|---|---|---|
| 7 | A | 12.759 | 3 | 4.253 | 0.746 | 0.563 |
| B | 13.760 | 3 | 4.587 | 0.805 | 0.535 | |
| C | 11.315 | 3 | 3.772 | 0.662 | 0.605 | |
| Error | 34.196 | 6 | 5.699 | |||
| Total | 72.030 | 15 | ||||
| 28 | A | 192.172 | 3 | 64.057 | 7.761 | 0.017 |
| B | 7.497 | 3 | 2.499 | 0.303 | 0.823 | |
| C | 59.978 | 3 | 19.993 | 2.422 | 0.164 | |
| Error | 49.524 | 6 | 8.253 | |||
| Total | 309.168 | 15 |
表4 方差分析
Table 4 Variance analysis
| Age/d | Factor | Quadratic sum | Degree of freedom | MSE | F | P |
|---|---|---|---|---|---|---|
| 7 | A | 12.759 | 3 | 4.253 | 0.746 | 0.563 |
| B | 13.760 | 3 | 4.587 | 0.805 | 0.535 | |
| C | 11.315 | 3 | 3.772 | 0.662 | 0.605 | |
| Error | 34.196 | 6 | 5.699 | |||
| Total | 72.030 | 15 | ||||
| 28 | A | 192.172 | 3 | 64.057 | 7.761 | 0.017 |
| B | 7.497 | 3 | 2.499 | 0.303 | 0.823 | |
| C | 59.978 | 3 | 19.993 | 2.422 | 0.164 | |
| Error | 49.524 | 6 | 8.253 | |||
| Total | 309.168 | 15 |
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