1 Zhejiang Institute of Communications Co., Ltd., Hangzhou 310030, China 2 College of Civil Engineering, Tongji University, Shanghai 200092, China 3 School of Materials Science and Engineering, Tongji University, Shanghai 201804, China
Abstract: Using good mineral admixtures and green fine aggregates to partially replace cements and quartz sands to prepare ecological ultra high performance concrete (UHPC) can optimize its properties and reduce the carbon emission during material preparation. There is a lack of research about the tensile strain hardening behavior of ecological UHPC. The influence of nano-metakaolin contents (0%, 3% and 6%) and fine aggregate types (quartz sand, river sand and manufactured sand) on the mechanical properties of UHPC was studied via uniaxial tensile tests, compressive strength tests and workability measurements. Finally, the tensile strain hardening mechanism of UHPC incorporated with nano-metakaolin and manufactured sand was clarified based on microstructural analysis. The results show that nano-metakaolin can improve the bond behavior of steel fiber-UHPC matrix interface, and increase the strain hardening capacity of UHPC and raise the recovery efficiency of steel fiber effective anchorage. The promotion space of the strain hardening capacity of UHPC incorporated with manufactured sands is relatively low due to that manufactured sands can improve the high cracking strength of UHPC. The drawing resistance provided by manufactured sands for steel fibers is insufficient during steel fiber pulling out, and the scratch grooves are unobvious and the crushed debris of UHPC matrix is slight on the surface of the pulled-out steel fibers. This makes the tensile strain softening rate of UHPC accelerated.
1 Zhao Y H, Sun Z P, Mu F Y, et al. Journal of Building Materials, 2021, 24(2), 276 (in Chinese). 赵一鹤, 孙振平, 穆帆远, 等. 建筑材料学报, 2021, 24(2), 276. 2 Yoo D Y, Banthia N. Cement and Concrete Composites, 2016, 73, 267. 3 Huang B T, Wang Y T, Wu J Q, et al. Advances in Structural Enginee-ring, 2020, 6(24), 1182. 4 Yu R. China Concrete, 2020(8), 30 (in Chinese). 余睿.混凝土世界, 2020(8), 30. 5 Xiao J Z, Schneider H, Donnecke C,et al. Construction and Building Materials, 2004, 18(6), 9. 6 Wei H N, Liu T J, Zou D J, et al. Journal of Building Materials, 2021, 24(3), 492 (in Chinese). 魏慧男, 刘铁军, 邹笃建, 等. 建筑材料学报, 2021, 24(3), 492. 7 Long G C, Yang K, Cheng Z Q, et al. Materials Reports, 2022, 36(13), 109 (in Chinese). 龙广成, 杨恺, 程智清, 等. 材料导报, 2022, 36(13), 109. 8 Li Q C, Fan Y F, Chen H. Journal of Southeast University (Natural Science Edition), 2021, 51(3), 480 (in Chinese). 李秋超, 范颖芳, 陈昊.东南大学学报(自然科学版), 2021, 51(3), 480. 9 Habeeb G M. Journal of Engineering and Sustainable Development, 2018, 22(2), 96. 10 Muhd N M S, Hamidah M S, Mohd F A, et al. Construction and Building Materials, 2016, 127, 167. 11 Faried A S, Mostafa S A, Tayeh B A, et al. Journal of Building Engineering, 2021,43, 102569. 12 Feng T T, Jiang J Y, Liu Z Y, et al. Journal of the Chinese Ceramic So-ciety, 2020, 48(8), 1177 (in Chinese). 冯滔滔, 蒋金洋, 刘志勇, 等.硅酸盐学报, 2020, 48(8), 1177. 13 Ding Q J, Pengcheng K Y, Hu J, et al. Bulletin of the Chinese Ceramic Society, 2019, 38(2), 488 (in Chinese). 丁庆军, 彭程康琰, 胡俊, 等.硅酸盐通报, 2019, 38(2), 488. 14 Zhu H Y, Jiang J Y, Li H, et al. Materials Reports, 2020, 34(12), 24029 (in Chinese). 褚洪岩, 蒋金洋, 李荷, 等.材料导报, 2020, 34(12), 24029. 15 Zhao J, Lu X Y. China Concrete, 2019(124), 51 (in Chinese). 赵筠, 路新瀛.混凝土世界, 2019(124), 51. 16 Wen D C, Wei D B, Wu L D, et al. Journal of Building Materials, 2022, 25(7), 693 (in Chinese). 温得成, 魏定邦, 吴来帝, 等. 建筑材料学报, 2022, 25(7), 693. 17 Wang J Y, Guo J Y, Xiao R C, et al. China Civil Engineering Journal, 2017, 50(11), 10 (in Chinese). 王俊颜, 郭君渊, 肖汝诚, 等.土木工程学报, 2017, 50(11), 10. 18 Bian C, Wang J Y, Guo J Y. Construction and Building Materials, 2021, 267, 120927. 19 Tregger N A, Pakula M E, Shan S P. Cement and Concrete Research, 2010, 40(3), 384. 20 Wang J W, An M Z, Liu Y Z, et al. China Railway Science, 2021, 42(2), 19 (in Chinese). 王军伟, 安明喆, 刘亚洲, 等.中国铁道科学, 2021, 42(2), 19. 21 Wu Z M. Multi-investigation on fiber-matrix interfacial bond properties in ultra-high performance concrete. Ph.D. Thesis, Hunan University, China, 2017 (in Chinese). 吴泽媚. 超高性能混凝土中纤维与基体界面粘结性能多尺度研究. 博士学位论文, 湖南大学, 2017. 22 Rong Z D, Jiang G, Sun W, et al. Journal of Hebei University of Techno-logy, 2014, 43(6), 30 (in Chinese). 戎志丹, 姜广, 孙伟, 等.河北工业大学学报, 2014, 43(6), 30. 23 Zhao S, Sun W. Construction and Building Materials, 2014, 63, 150.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2023, Vol. 37 
