物理激发后再生砖粉ECC的力学性能及微观结构

doi:10.16552/j.cnki.issn1001-1625.2024.0812

摘要/Abstract

摘要： 废弃黏土砖中含有大量SiO₂和Al₂O₃等活性矿物成分,将其破碎、研磨加工后可制得再生砖粉(RBP)。通过有效的激发方式提高RBP火山灰活性,可将RBP运用到工程水泥基复合材料(ECC)中充当部分胶凝材料,具有极大的经济效益和环境效益。试验通过对物理激发后RBP的活性指标、微观结构和XRD谱进行分析,确定了RBP的最佳物理激发时间。在此基础上利用活性激发后RBP制备再生砖粉工程水泥基复合材料(RBP-ECC),对RBP-ECC进行抗折、抗压、单轴拉伸和四点弯曲试验,研究RBP取代率对RBP-ECC力学性能的影响。结果表明,随着物理激发后RBP取代率的增加,RBP-ECC各强度指标均有所下降,而极限拉应变和弯曲跨中挠度逐渐增大,最大分别可达5.22%和55.53 mm。RBP取代率为20%(质量分数)时,RBP-ECC弯曲韧性指标提升最大,较基准ECC提高约59%,各强度指标下降幅度较低,RBP-ECC仍能保持较高的强度和韧性。综合考虑RBP-ECC的强度、韧性与可持续性指标,选取20%为RBP-ECC最佳砖粉取代率,并对该取代率下RBP-ECC纤维-基体界面进行了微观分析,结果表明20%的RBP取代率下RBP-ECC中存在纤维拔出破坏模式和纤维拉断破坏模式,相较于基准ECC,RBP-ECC仍能表现出较高的拉伸韧性和适宜的抗拉强度。

关键词: ECC, 再生砖粉, 活性激发, 砖粉取代率, 力学性能, 破坏模式

Abstract: The waste clay brick contains a large amount of active mineral components such as SiO₂ and Al₂O₃. After crushing and grinding, recycled brick powder (RBP) can be prepared. By improving the pozzolanic activity of RBP through effective excitation methods, RBP can be applied to engineered cementitious composite (ECC) as part of cementitious materials, which has great economic and environmental benefits. By analyzing the activity index, microstructure and XRD pattern of RBP after physical excitation, the optimum physical excitation time of RBP was determined. On this basis, the recycled brick powder-engineered cementitious composite (RBP-ECC) was prepared with RBP after active excitation. The flexural, compressive, uniaxial tensile and four-point bending tests were carried out to study the influence of RBP replacement rate on the mechanical properties of RBP-ECC. The results show that the strength indexes of RBP-ECC decrease with the increase of RBP replacement rate after physical excitation, while the ultimate tensile strain and mid-span deflection increase gradually, up to 5.22% and 55.53 mm, respectively. When the RBP replacement rate is 20% (mass fraction), the bending toughness index of RBP-ECC increases the most, which is about 59% higher than that of benchmark ECC. Each strength index of RBP-ECC has a lower decline, but still can maintain high strength and toughness. The strength, toughness and sustainability indexes of RBP-ECC were comprehensively considered, and 20% was selected as the best brick powder replacement rate of RBP-ECC, and microscopic analysis of RBP-ECC fiber-matrix interface under this replacement rate was carried out. The results show that there are fiber pull-out failure modes and fiber breaking failure modes in RBP-ECC at 20% RBP replacement rate, and RBP-ECC shows higher tensile toughness and suitable tensile strength compared with benchmark ECC.

Key words: ECC, recycled brick powder, active excitation, brick powder replacement rate, mechanical property, failure mode

中图分类号:

TU528

楚留声, 杜飞翔, 田野, 元成方, 程站起. 物理激发后再生砖粉ECC的力学性能及微观结构[J]. 硅酸盐通报, 2025, 44(1): 253-263.

CHU Liusheng, DU Feixiang, TIAN Ye, YUAN Chengfang, CHENG Zhanqi. Mechanical Properties and Microstructure of Recycled Brick Powder ECC after Physical Excitation[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2025, 44(1): 253-263.

参考文献

[1] LIU H Z, ZHANG Q, LI V, et al. Durability study on engineered cementitious composites (ECC) under sulfate and chloride environment[J]. Construction and Building Materials, 2017, 133: 171-181.
[2] ARCE G A, NOORVAND H, HASSAN M M, et al. Feasibility of low fiber content PVA-ECC for jointless pavement application[J]. Construction and Building Materials, 2021, 268: 121131.
[3] SU Y F, HUANG C H, JEONG H, et al. Autogenous healing performance of internal curing agent-based self-healing cementitious composite[J]. Cement and Concrete Composites, 2020, 114: 103825.
[4] VIEIRA D R, CALMON J L, COELHO F Z. Life cycle assessment (LCA) applied to the manufacturing of common and ecological concrete: a review[J]. Construction and Building Materials, 2016, 124: 656-666.
[5] HISSEINE O A, TAGNIT-HAMOU A. Development of ecological strain-hardening cementitious composites incorporating high-volume ground-glass pozzolans[J]. Construction and Building Materials, 2020, 238: 117740.
[6] 李方, 杨健, 李粒珲. 废玻璃粉作为辅助胶凝材料对砂浆性能影响及作用机理[J]. 硅酸盐通报, 2022, 41(9): 3208-3218.
LI F, YANG J, LI L H. Effect and mechanism of waste glass powder as supplementary cementitious material on mortar properties[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(9): 3208-3218 (in Chinese).
[7] YU K Q, ZHU W J, DING Y, et al. Micro-structural and mechanical properties of ultra-high performance engineered cementitious composites (UHP-ECC) incorporation of recycled fine powder (RFP)[J]. Cement and Concrete Research, 2019, 124: 105813.
[8] 蔡新江, 戴朝炜, 邵永健, 等. 再生玻璃作为辅助胶凝材料制备ECC的力学及变形性能[J]. 硅酸盐通报, 2020, 39(9): 2739-2744.
CAI X J, DAI C W, SHAO Y J, et al. Mechanical and deformation properties of engineered cementitious composites containing recycled glass as supplementary cementitious material[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(9): 2739-2744 (in Chinese).
[9] ZHAO J J, YAN C W, LIU S G, et al. Effect of solid waste ceramic on uniaxial tensile properties and thin plate bending properties of polyvinyl alcohol engineered cementitious composite[J]. Journal of Cleaner Production, 2020, 268: 122329.
[10] GUERRA B C, BAKCHAN A, LEITE F, et al. BIM-based automated construction waste estimation algorithms: the case of concrete and drywall waste streams[J]. Waste Management, 2019, 87: 825-832.
[11] 刘荣涛, 朱建辉, 朱玮杰, 等. 建筑废弃黏土砖资源化综合利用综述[J]. 硅酸盐通报, 2016, 35(10): 3191-3195.
LIU R T, ZHU J H, ZHU W J, et al. Comprehensive research on utilizing the wasted building clay brick[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(10): 3191-3195 (in Chinese).
[12] HWANG C L, DAMTIE YEHUALAW M, VO D H, et al. Development of high-strength alkali-activated pastes containing high volumes of waste brick and ceramic powders[J]. Construction and Building Materials, 2019, 218: 519-529.
[13] LI S J, GAO J M, LI Q Y. et al. Investigation of using recycled powder from the preparation of recycled aggregate as a supplementary cementitious material[J]. Construction and Building Materials, 2020, 267(18): 120976.
[14] 贺炳楠, 闫龙, 李玉博. 物理激发再生微粉对再生混凝土力学性能的影响[J]. 材料导报, 2023, 37(增刊1): 170-174.
HE B N, YAN L, LI Y B. Effect of physically excited recycled micronised powder on the mechanical properties of recycled concrete[J]. Materials Reports, 2023, 37(supplement 1): 170-174 (in Chinese).
[15] 余昭阳, 刘润清, 葛星, 等. 碱激发再生黏土砖粉泡沫混凝土性能研究[J]. 混凝土与水泥制品, 2022(5): 81-85+89.
YU Z Y, LIU R Q, GE X, et al. Study on properties of alkali activated recycled clay brick powder foamed concrete[J]. China Concrete and Cement Products, 2022(5): 81-85+89 (in Chinese).
[16] 王倩, 李华伟, 刘飞宇. 不同激发剂对陶瓷微粉水泥胶砂强度的影响[J]. 非金属矿, 2023, 46(1): 47-50+54.
WANG Q, LI H W, LIU F Y. Effect of different activators on the strength of cement mortar containing ceramic micropowder[J]. Non-Metallic Mines, 2023, 46(1): 47-50+54 (in Chinese).
[17] 田野. 活性激发后再生砖粉ECC基本力学性能研究[D]. 郑州: 郑州大学, 2021.
TIAN Y. Study on basic mechanical properties of recycled brick powder ECC after active excitation[D].Zhengzhou: Zhengzhou University, 2021 (in Chinese).
[18] Standard specification for coal fly ash and raw or calcined natural pozzolan for use in concrete: ASTM C618—05[S]. ASTM International, 2005.
[19] TANG Q, MA Z M, WU H X, et al. The utilization of eco-friendly recycled powder from concrete and brick waste in new concrete: a critical review[J]. Cement and Concrete Composites, 2020, 114: 103807.
[20] ZHAO Y S, GAO J M, LIU C B, et al. The particle-size effect of waste clay brick powder on its pozzolanic activity and properties of blended cement[J]. Journal of Cleaner Production, 2020, 242: 118521.
[21] GUZZO P L, SANTOS J B, DAVID R C. Particle size distribution and structural changes in limestone ground in planetary ball mill[J]. International Journal of Mineral Processing, 2014, 126: 41-48.
[22] LI T T, SUI F F, LI F C, et al. Effects of dry grinding on the structure and granularity of calcite and its polymorphic transformation into aragonite[J]. Powder Technology, 2014, 254: 338-343.
[23] GUZZO P L, MARINHO DE BARROS F B, DE ARRUDA TINO A A. Effect of prolonged dry grinding on size distribution, crystal structure and thermal decomposition of ultrafine particles of dolostone[J]. Powder Technology, 2019, 342: 141-148.
[24] CHAI L J, GUO L P, CHEN B, et al. Tensile behaviors of ecological high ductility cementitious composites exposed to interactive freeze-thaw-carbonation and single carbonation[J]. Journal of Southeast University (English Edition), 2019, 35(3): 367-373.
[25] YANG Y Z, GAO X J, DENG H W, et al. Effects of water/binder ratio on the properties of engineered cementitious composites[J]. Journal of Wuhan University of Technology-Materials Science Edition, 2010, 25(2): 298-302.