低温养护下矿物掺合料湿喷混凝土力学性能及配比优化研究

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1589-1598.

低温养护下矿物掺合料湿喷混凝土力学性能及配比优化研究

杨帆^1,2,3, 张友锋^1,3,4, 余姚⁵

1.赣南科技学院建设工程系,赣州 341000;
2.赣州市智能建造重点实验室,赣州 341000;
3.江西省矿业工程重点实验室,赣州 341000;
4.北京科技大学土木与资源工程学院,北京 100083;
5.江西理工大学理学院,赣州 341000

收稿日期:2021-12-21 修回日期:2022-01-20 出版日期:2022-05-15 发布日期:2022-06-01
作者简介:杨帆(1981—),女,讲师。主要从事混凝土材料、地下工程加固技术等方面的研究。E-mail:554740639@qq.com
基金资助:
国家自然科学基金(51464015)

Mechanical Properties and Ratio Optimization of Mineral Admixture Wet Shotcrete under Low Temperature Curing

YANG Fan^1,2,3, ZHANG Youfeng^1,3,4, YU Yao⁵

1. Department of Construction Engineering, Gannan University of Science and Technology, Ganzhou 341000, China;
2. Ganzhou Key Laboratory of Intelligent Construction, Ganzhou 341000, China;
3. Key Laboratory of Mining Engineering in Jiangxi Province, Ganzhou 341000, China;
4. School of Civil and Environmental Engineering, University of Science and Technology Beijing, Beijing 100083, China;
5. School of Science, Jiangxi University of Technology, Ganzhou 341000, China

Received:2021-12-21 Revised:2022-01-20 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 为系统研究粉煤灰掺量、硅灰掺量及养护温度对湿喷混凝土力学性能的影响规律,通过设计正交试验对湿喷混凝土抗压强度进行极差和方差分析。结果表明:湿喷混凝土抗压强度随养护龄期增加而增大,但抗压强度增幅随养护龄期延长而减弱;增加硅灰和粉煤掺量均能有效提高湿喷混凝土抗压强度,但粉煤灰掺量超过10%(质量分数,下同)后,粉煤灰掺量的增加对混凝土后期抗压强度没有显著的影响;三因素对湿喷混凝土抗压强度影响程度顺序为硅灰掺量>养护温度>粉煤灰掺量;湿喷混凝土抗压强度对矿物掺合料的敏感性与养护温度呈正相关,增大养护温度能够提高矿物掺合料对湿喷混凝土抗压强度的改善效果;随着养护温度的提高,团絮状胶凝物质大量生成,水化产物黏结得更为密实,混凝土的抗压强度和承载性能得到进一步增强;构建多元非线性回归模型能够对混凝土抗压强度进行预测,并且湿喷混凝土在硅灰掺量、粉煤灰掺量及养护温度分别为15%、15%和10 ℃时具有最佳的抗压强度。

关键词: 湿喷混凝土, 矿物掺合料, 抗压强度, 养护温度, 正交试验, 微观结构

Abstract: To systematically study the effects of fly ash content, silica fume content and curing temperature on the mechanical properties of wet shotcrete, the range and variance analysis of the compressive strength of wet shotcrete were carried out by designing orthogonal tests. The results show that the compressive strength of wet shotcrete increases with the increase of curing age, but the increase rate slows down with the extension of curing ages.The compressive strength of wet shotcrete can be effectively improved by the increase content of silica fume and pulverized coal, but when the content of fly ash exceeds 10% (mass fraction, the same below), the increase of fly ash content has no significant influence on the later compressive strength of concrete. The order of the influence of the three factors on the compressive strength of wet shotcrete is silica fume content＞curing temperature＞fly ash content. The sensitivity of the compressive strength of wet shotcrete to mineral admixtures is positively correlated with the curing temperature. The improvement effect of mineral admixtures on compressive strength of wet shotcrete increases with the increase of curing temperature. With the increase of curing temperature, a large number of flocculent cementitious substances are generated. The hydration products bond more densely, and the compressive strength and bearing performance of concrete are further enhanced. The established multiple nonlinear models can predict the compressive strength of concrete, and wet shotcrete has the best compressive strength when the silica fume content, fly ash content and curing temperature are 15%, 15% and 10 ℃, respectively.

Key words: wet shotcrete, mineral admixture, compressive strength, curing temperature, orthogonal test, microstructure

中图分类号:

TD262
TU528

杨帆, 张友锋, 余姚. 低温养护下矿物掺合料湿喷混凝土力学性能及配比优化研究[J]. 硅酸盐通报, 2022, 41(5): 1589-1598.

YANG Fan, ZHANG Youfeng, YU Yao. Mechanical Properties and Ratio Optimization of Mineral Admixture Wet Shotcrete under Low Temperature Curing[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1589-1598.

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