碳化再生粗骨料环保型超高性能混凝土的制备
作者:
作者单位:

1.武汉理工大学 硅酸盐建筑材料国家重点实验室,湖北 武汉 430070;2.武汉理工大学 材料科学与工程学院,湖北 武汉 430070

作者简介:

冷 勇(1998—),男,江西宜春人,武汉理工大学硕士生.E-mail: 1440988702@qq.com

通讯作者:

余 睿(1986—),男,湖北咸宁人,武汉理工大学研究员,博士生导师,博士.E-mail: r.yu@whut.edu.cn

中图分类号:

TU525

基金项目:

国家自然科学基金资助项目(52178249)


Preparation of Environmentally Friendly UHPC Containing Carbonized Recycled Coarse Aggregate
Author:
Affiliation:

1.State Key Laboratory of Silicate Materials for Architectures, Wuhan University of Technology, Wuhan 430070, China;2.School of Materials Science and Engineering, Wuhan University of Technology, Wuhan 430070, China

  • 摘要
  • |
  • 图/表
  • |
  • 访问统计
  • |
  • 参考文献 [15]
  • |
  • 相似文献 [20]
  • | | |
  • 文章评论
    摘要:

    提出了一种再生建筑废弃物的高效利用方法,并以此制备了生态型超高性能混凝土(UHPC).基于改进的颗粒堆积模型(MAA模型),开发了最大粒径为4.75 mm的碳化再生粗骨料(CRCA)超高性能混凝土(CRCA-UHPC),评估了CRCA对UHPC 宏观性能及纳微观结构的影响.结果表明:将CRCA掺入 UHPC中可以改善UHPC的力学性能和耐久性能,降低UHPC的自收缩,优化骨料与基体间的界面过渡区(ITZ).

    Abstract:

    An efficient utilization method of recycled construction waste, and a method for preparing ecological ultra-high performance concrete were proposed. First, based on the improved particle packing model MAA model, carbonized recycled coarse aggregate ultra-high performance concrete (CRCA-UHPC) with a maximum particle size of 4.75 mm was developed. Then, the effect of the introduction of CRCA on the macroscopic properties as well as the nano-microstructure of UHPC was evaluated. The results show that by the introduction of CRCA into UHPC, the mechanical properties and durability of UHPC are improved, the autogenous shrinkage of UHPC is reduced, and the interface transition zone (ITZ) between the aggregate and the matrix is optimized.

    表 2 UHPC的配合比Table 2 Mix proportions of UHPC kg/m3
    表 3 3种粗骨料的基本性能Table 3 Basic properties of three kinds of coarse aggregate
    表 1 胶凝材料的化学组成Table 1 Chemical compositions of cementitious materials
    图1 碳化再生粗骨料处理流程图Fig.1 Processing flow chart of CRCA
    图2 碳化前后再生粗骨料的微观形貌Fig.2 Microscopic morphology of RCA before and after carbonization
    图3 碳化前后再生骨料的EDS分析Fig.3 EDS analysis of RCA before and after carbonization
    图4 不同粗骨料对UHPC抗压强度的影响Fig.4 Effect of different coarse aggregates on compressive strength of UHPC
    图5 CRCA和RCA对UHPC自收缩的影响Fig.5 Effect of CRCA and RCA on autogenous shrinkage of UHPC
    图6 不同粗骨料对UHPC抗氯离子渗透性能的影响Fig.6 Effect of different coarse aggregates on durability of UHPC
    图7 3种UHPC的SEM-BSE照片Fig.7 SEM-BSE images of three kinds of UHPC
    图8 CRCA和RCA对UHPC界面过渡区(ITZ)硬度的影响Fig.8 Effect of CRCA and RCA on hardness of interface transition zone(ITZ) of UHPC
    参考文献
    [1] 张家广,陈景琦,孟庆玲,等. 混菌矿化增强再生混凝土粗骨料物理力学性能[J]. 建筑材料学报,2022,25(10):1027-1033.
    [2] WANG X, YU R, SHUI Z, et al. Optimized treatment of recycled construction and demolition waste in developing sustainable ultra-high performance concrete[J]. Journal of Cleaner Production. 2019;221:805-16.
    [3] 陈守开,刘洋,赵云鹏,等. 废玻璃颗粒对再生骨料透水混凝土的改性作用[J/OL]. 建筑材料学报[2022-05-15].https://kns.cnki.net/kcms/detail/31.1764.TU.20220117.1101.008.html.
    [008] html.(in Chinese)
    [4] COELHO A, BRITO J D. Economic viability analysis of a construction and demolition waste recycling plant in Portugal-part I:Location, materials, technology and economic analysis[J]. Journal of Cleaner Production, 2013,39(5):338-52..
    [5] BEHERA M, BHATTACHARYYA S K, MINOCHA A K, et al. Recycled aggregate from C&D waste & its use in concrete-A breakthrough towards sustainability in construction sector:A review[J]. Construction and Building Materials,2014, 68(15):501-516.
    [6] XUAN D, ZHAN B, POON C S. Assessment of mechanical properties of concrete incorporating carbonated recycled concrete aggregates[J]. Cement and Concrete Composites,2016, 65:67-74.
    [7] FAN D, YU R, FU S, et al. Precise design and characteristics prediction of ultra-high performance concrete (UHPC) based on
    [8] 覃维祖,曹峰. 一种超高性能混凝土——活性粉末混凝土[J]. 工业建筑,1999(4):18-20.
    [9] 陈宝春,季韬,黄卿维,等. 超高性能混凝土研究综述[J]. 建筑科学与工程学报, 2014, 31(3):1-24.
    [10] DONG E, YU R, FAN D, et al. Absorption-desorption process of internal curing water in ultra-high performance concrete (UHPC) incorporating pumice:From relaxation theory to dynamic migration model[J]. Cement and Concrete Composite, 2022,133:104659.
    [11] HABER Z B, MUNOZ J F, DE LA VARGA I, et al. Bond characterization of UHPC overlays for concrete bridge decks:Laboratory and field testing[J]. Construction and Building Materials,2018, 190:1056-1068.
    [12] LI P P, YU Q L, BROUWERS H J H. Effect of coarse basalt aggregates on the properties of ultra-high performance concrete (UHPC)[J]. Construction and Building Materials,2018, 170:649-659.
    [13] ZENG X, DENG K, LIANG H, et al. Uniaxial behavior and constitutive model of reinforcement confined coarse aggregate UHPC[J]. Engineering Structures,2020, 207:110261.
    [14] KOU S C, ZHAN B J, POON C S . Use of a CO2 curing step to improve the properties of concrete prepared with recycled aggregates[J]. Cement and Concrete Composites,2014, 45(1):22-28.
    引证文献
    网友评论
    网友评论
    分享到微博
    发 布
引用本文

冷勇,余睿,范定强,张学玉.碳化再生粗骨料环保型超高性能混凝土的制备[J].建筑材料学报,2022,25(11):1185-1189

复制
分享
文章指标
  • 点击次数:265
  • 下载次数: 644
  • HTML阅读次数: 26
  • 引用次数: 0
历史
  • 收稿日期:2022-05-15
  • 最后修改日期:2022-06-28
  • 在线发布日期: 2022-11-30
文章二维码