湿磨超细化废弃混凝土再生微粉用作矿物掺合料的研究
Research on the application of wet-grinding ultra-fine recycled micropowder from waste concrete as mineral admixture
关键词：
废弃混凝土；湿磨超细化再生微粉；砂浆；流动度；力学性能；水化；孔结构
Key words：
Waste concrete; Wet-grinding ultra-fine recycled micropowder; Mortar; Fluidity; Mechanical property; Hydration; Pore structure
刊期：
2025年第8期
DOI：
10.19761/j.1000-4637.2025.08.001.05
文章编号：
基金项目：
中央支持地方科技发展专项项目（24ZYCXCP0040）；四川省科技计划项目（2023YFG0379）。
作者：
王 涛1，施发弘2，蒋 俊1，*，郑俊峰2，杨奉源2，贾碧胜2，卢忠远1，*
单位：
1.西南科技大学 环境友好能源材料国家重点实验室，四川 绵阳 621010；2.四川蜀道铁路投资集团有限责任公司，四川 成都 610041
摘要
摘 要：研究了不同中值粒径（15、11、7、3 μm）湿磨超细化废弃混凝土再生微粉对砂浆流动度、力学性能及净浆体系水化程度和孔结构的影响。结果表明：随着湿磨再生微粉中值粒径的减小，砂浆的流动度、流动度比均降低，3、7、28 d抗折和抗压强度基本增大；湿磨再生微粉的掺入在一定程度上加速了净浆体系的早期水化速率，但会抑制后期的水化进程；随着湿磨再生微粉中值粒径的减小，净浆体系的水化程度提高，孔隙结构细化。
Abstract：The effects of wet-grinding ultra-fine recycled micropowder from waste concrete with various median particle sizes(15, 11, 7, 3 μm) on the fluidity, mechanical properties of mortar, as well as the hydration degree and pore structure of the cement paste system were investigated. The results show that, with the decrease of the median particle size of the wet-grinding recycled micropowder, the fluidity and fluidity ratio of the mortar decreases, and the 3, 7, 28 d flexural and compressive strengths basically increase. The incorporation of wet-grinding recycled micropowder accelerates the early hydration rate of the cement paste system to a certain extent, but inhibits the later hydration process. With the decrease of the median particle size of the wet-grinding recycled micropowder, the hydration degree of the cement paste system increases, and the pore structure is refined.
结论
（1）掺入适当细度的湿磨再生微粉提高了砂浆的流动度；随着湿磨再生微粉中值粒径的减小，砂浆流动度、流动度比均降低。
（2）掺湿磨再生微粉砂浆各龄期的抗折和抗压强度均低于纯水泥砂浆相应龄期的抗折和抗压强度；随着湿磨再生微粉中值粒径的减小，掺湿磨再生微粉砂浆的各龄期抗折和抗压强度基本增大；当湿磨再生微粉的中值粒径为3 μm时，砂浆的28 d抗折和抗压强度相对最高。
（3）湿磨再生微粉细度变化对净浆物相组成类型没有影响，仅会影响物相的衍射峰强度；不同细度湿磨再生微粉的掺入在一定程度上加速了体系的早期水化速率，但会抑制后期的水化进程；随着湿磨再生微粉中值粒径的减小，掺湿磨再生微粉净浆体系的水化程度提高，孔隙结构细化。
参考文献
[1] 曹元辉,王胜杰,王勇,等.我国建筑垃圾综合利用现状及未来发展趋势[J].中国建材,2021(9):118-121.
[2] 李晓,梁亮.再生混凝土微粉活化及其性能研究[J].混凝土,2023(11):105-108,113.
[3] 高素芹,余沛.城市废弃混凝土骨料再生混凝土的力学性能研究[J].太原学院学报(自然科学版),2024,42(1):13-17.
[4] 常智玮,詹炳根,王存,等.废弃混凝土再生微粉活化研究[J].合肥工业大学学报(自然科学版),2023,46(7):936-940,971.
[5] XIAO J Z,MA Z M,SUI T B,et al.Mechanical properties of concrete mixed with recycled powder produced from construction and demolition waste[J].Journal of Cleaner Production,2018,188:720-731.
[6] KIM Y J,CHOI Y W.Utilization of waste concrete powder as a substitution material for cement[J].Construction and Building Materials,2012,30:500-504.
[7] KIM Y J.Quality properties of self-consolidating concrete mixed with waste concrete powder[J].Construction and Building Materials,2017,135:177-185.
[8] 杨琳.再生混凝土微粉制备再生胶凝材料的研究[D].南京:东南大学,2017.
[9] 毋雪梅,杨久俊,黄明.建筑垃圾磨细粉作矿物掺合料对水泥物理力学性能的影响[J].新型建筑材料,2004(4):16-18.
[10] LU B,SHI C J,ZHANG J K,et al.Effects of carbonated hardened cement paste powder on hydration and microstructure of Portland cement[J].Construction and Building Materials,2018,186:699-708.
[11] XU C,LI H X,YANG X J.Effect and characterization of the nucleation CSH seed on the reactivity of granulated blast furnace slag powder[J].Construction and Building Materials,2020,238:117726.
[12] ZHU P,MAO X Q,QU W J.Investigation of recycled powder as supplementary cementitious material[J].Magazine of Concrete Research,2019,71(24):1312-1324.
[13] WANG T,HE X Y,YANG J,et al.Nano-treatment of autoclaved aerated concrete waste and its usage in cleaner building materials[J].Journal of Wuhan University of Technology(Materials Science Edition),2020,35(4):786-793.
[14] 高敏,郭启龙,杜磊,等.再生微粉对干混砂浆性能的影响研究[J].硅酸盐通报,2022,41(8):2851-2859.
[15] 马稚童,高敏,郭启龙,等.复合活化对废弃混凝土再生微粉活性的影响及机理研究[J].新型建筑材料,2024,51(1):29-33,69.
[16] ZHANG J J,TAN H B,HE X Y,et al.Nano particles prepared from hardened cement paste by wet grinding and its utilization as an accelerator in Portland cement[J].Journal of Cleaner Production,2021,283:124632.
[17] 田青,屈孟娇,张苗,等.废弃混凝土再生微粉激活方式研究进展[J].硅酸盐通报,2020,39(8):2476-2485.
[18] 谭洪波,孔祥辉,贺行洋,等.化学外加剂对粉煤灰湿法细化活化的影响[J].材料导报,2024,38(5):188-194.
[19] 苏泽淳,曾三海,郑正旗,等.超细磷渣粉对水泥性能的影响[J].硅酸盐通报,2020,39(8):2536-2541.
[20] 吴中伟.混凝土科学技术近期发展方向的探讨[J].硅酸盐学报,1979(3):262-270.
引用本文
王涛,施发弘,蒋俊,等.湿磨超细化废弃混凝土再生微粉用作矿物掺合料的研究[J].混凝土与水泥制品,2025(8):1-5.
WANG T,SHI F H,JIANG J,et al.Research on the application of wet-grinding ultra-fine recycled micropowder from waste concrete as mineral admixture[J].China Concrete and Cement Products,2025(8):1-5.
上一个： 磷石膏基胶凝材料的制备及其混凝土性能研究
相关文件