Durability Degradation Characteristics and Mechanism of Partial Immersed Recycled Aggregate Concrete Subjected to Composite Salt Attack of Magnesium-Sulfate-Chloride
WANG Jiabin1,2,3,*, FAN Yijie1,3, NIU Ditao2, WANG Yu1,3, ZHANG Kaifeng4
1 Civil & Architecture Engineering, Xi’an Technological University, Xi’an 710021, China 2 State Key Laboratory of Green Building, Xi’an University of Architecture & Technology, Xi’an 710055, China 3 Xi’an Key Laboratory of Civil Engineering Testing and Destruction Analysis on Military-Civil Dual Use Technology, Xi’an Technological University, Xi’an 710021, China 4 China West Construction North Co., Ltd., Xi’an 710065, China
Abstract: In order to investigate the durability degradation characteristics and mechanism of partial burial recycled aggregate concrete (RAC) structure members in Northwest China, the durability experiment of 14 mixtures about RAC with supplementary cementitious materials (SCMs) of fly ash, granulated blast furnace slag, silica fume and metakaolin, respectively, was conducted for partial immersed in compound salt solution with MgSO4, Na2SO4 and NaCl. Comprehensively analyzed the relative dynamic elastic modulus, macro-and micro-morphology, and mineral composition and its relative content, the partial immersed RAC can be divided into four corrosive zones of saturation zone, air-liquid two-phased transition zone, moisture transport zone and dry zone, respectively, along the longitudinal direction. At initial stage of partial immersed, the degradation of air-liquid two-phased transition zone was higher than that of saturation zone, while the damage in saturation zone was equal to or over than that of air-liquid two-phased transition zone at the middle and late stage. Concurrently, the damage in moisture transport zone was formed and continued to develop slowly. With immersed aging increased, the destruction mechanism of saturation zone changed from chemical attack to chemical-physical attack, while that of the air-liquid two-phased transition zone was due to chemical-physical attack. The chemistry corrosive products of brucite, anhydrite, gypsum and chloromagnesite existed throughout the corrosion, but ettringite, Friedel’s salt and Mg10(OH)18Cl2·5H2O disappeared at the late stage of corrosion. And the physical crystalline salts included blodite, halite, MgSO4·xH2O, thenardite and mirabilite. The phase transformation between thenardite and mirabilite formed the great salt crystallization pressure in pores and micro-cracks, which rapidly decreased of RAC durability. At immersion time of 180 days, the corrosion resistance of RAC with fly ash and GBFS was generally well, however, the loss rate of compressive strength of RAC with fly ash and silica fume was more than 60%. In addition, the durability of RAC with GBFS-silica fume-metakaolin was much higher than that of RAC with fly ash-GBFS-metakaolin, which had spalled off grievously. Although a stable decreased rate, the resistance performance of RAC with four SCMs was still at the low level, compared to that of RAC with fly ash and GBFS at the same immersed time.
1 Pan Y. Recyclable Resources and Circular Economy, 2021, 14(7), 23(in Chinese). 潘永刚. 再生资源与循环经济, 2021, 14(7), 23. 2 Guo H, Shi C, Guan X, et al. Cement and Concrete Composites, 2018, 89, 251. 3 Xiao J, Ma X, Liu Q, et al. Journal of Architecture and Civil Enginee-ring, 2021, 38(2), 1(in Chinese). 肖建庄, 马旭伟, 刘琼, 等. 建筑科学与工程学报, 2021, 38(2), 1. 4 Tang Q, Ma Z, Wu H, et al. Cement and Concrete Composites, 2020, 114, 103807. 5 Wang J, Zhang K, Hou Z, et al. China Civil Engineering Journal, 2020, 53(11), 21(in Chinese). 王家滨, 张凯峰, 侯泽宇, 等. 土木工程学报, 2020, 53(11), 21. 6 Nehdi M L, Suleiman A R, Soliman A M. Cement and Concrete Research, 2014, 64, 42. 7 Wang F, Qin X, Sun R. Bulletin of the Chinese Ceramic Society, 2003(4), 25(in Chinese). 王复生, 秦晓娟, 孙瑞莲. 硅酸盐通报, 2003(4), 25. 8 Zhang Z, Zou Y, Yang J, et al. Cement and Concrete Composites, 2022, 125, 204299. 9 Peng L, Zhao Y, Zhang H. Construction and Building Materials, 2021, 277, 122277. 10 Xie F, Li J, Zhao G, et al. Construction and Building Materials, 2020, 253, 119144. 11 Alyami M H, Alrashidi R S, Mosavi H, et al. Construction and Building Materials, 2019, 229, 116920. 12 Jiang X, Mu S, Yang Z, et al. Construction and Building Materials, 2021, 266, 120936. 13 Ma K, Xie Y, Long G. Journal of the Chinese Ceramic Society, 2012, 40(10), 1448(in Chinese). 马昆林, 谢友均, 龙广成. 硅酸盐学报, 2012, 40(10), 1448. 14 Yang S, Ma Z, Shen Y, et al. Science Technology and Engineering, 2017, 17(16), 295(in Chinese). 杨淑雁, 马钊, 沈益韩, 等. 科学技术与工程, 2017, 17(16), 295. 15 Yang S. Science Technology and Engineering, 2018, 18(4), 143(in Chinese) . 杨淑雁. 科学技术与工程, 2018, 18(4), 143. 16 Liu Z, Zhou X, Peng J, et al. Materials Reports, 2023, 37(3), 20220317(in Chinese). 刘赞群, 周蕴婵, 彭嘉伟, 等. 材料导报, 2023, 37(3), 20220317. 17 Liu Z, Pei M, Zhang F, et al. Journal of Building Materials, 2020, 23(3), 485(in Chinese). 刘赞群, 裴敏, 张丰燕, 等. 建筑材料学报, 2020, 23(3), 485. 18 Bassuoni M T, Rahman M M. Cement and Concrete Research, 2016, 79, 395. 19 Liu Z, Li X, Hou L, et al. Journal of Building Materials, 2017, 20(3), 439(in Chinese) . 刘赞群, 李湘宁, 侯乐, 等. 建筑材料学报, 2017, 20(3), 439. 20 Sakr M R, Bassuoni M T. Cement and Concrete Research, 2021, 141, 106324. 21 Du J, Tang Z, Li G, et al. Construction and Building Materials, 2019, 225, 611. 22 Du J, Liu Z, Sun J, et al. Construction and Building Materials, 2022, 211, 126370. 23 Zhang C, Liu Q. Materials Reports, 2022, 36(1), 20100075(in Chinese). 张成琳, 刘清风. 材料导报, 2022, 36(1), 20100075. 24 Zhang C, Chen W, Mu S, et al. Construction and Building Materials, 2021, 285, 122806. 25 Chen W, Liu Q. Journal of Hydraulic Engineering, 2021, 52(5), 622(in Chinese) . 陈伟康, 刘清风. 水利学报, 2021, 52(5), 622. 26 Zhao G, Guo M, Cui J, et al. Construction and Building Materials, 2021, 294, 123560. 27 Liu P, Chen Y, Wang W, et al. Chemical Physics Letters, 2020, 745, 137254. 28 Juenger M C G, Snellings R, Bernal S A. Cement and Concrete Research, 2019, 122, 267. 29 Chen W, Brouwers H J H. Journal of Materials Science, 2007, 42, 444. 30 Zhang Z, Zhou J, Yang J, et al. Construction and Building Materials, 2020, 260, 119932. 31 Najjar M F, Nehdi M L, Soliman A M, et al. Construction and Building Materials, 2017, 137, 141. 32 Scherer G W. Cement and Concrete Research, 2004, 34, 1613. 33 Ke G, Zhang J, Liu Y, et al. Powder Technology, 2021, 387, 146. 34 Wang J, Hou Z, Zhang K, et al. Materials Reports, 2022, 36(12), 21060067 (in Chinese). 王家滨, 侯泽宇, 张凯峰, 等. 材料导报, 2022, 36(12), 21060067. 35 Liu K, Wang S, Quan X, et al. Construction and Building Materials, 2021, 294, 123554. 36 Cheng S, Shui Z, Li Q, et al. Construction and Building Materials, 2016, 127, 59. 37 Barbhuiya S, Chow P, Memon S. Construction and Building Materials, 2015, 95, 696. 38 Xie N, Dang Y, Shi X. Cement and Concrete Research, 2019, 120, 244. 39 Chen X, Lyu S, Zhang L, et al. Journal of Inorganic Materials, 2010, 25(2), 129(in Chinese). 陈雪刚, 吕双双, 张路, 等. 无机材料学报, 2010, 25(2), 129. 40 Gou S, Nai X, Xiao J, et al. Journal of Inorganic Materials, 2019, 34(7), 781(in Chinese). 苟生莲, 乃学瑛, 肖剑飞, 等. 无机材料学报, 2019, 34(7), 781. 41 Axel N C, Torben R J, Jonathan C H. Journal of Solid State Chemistry, 2004, 177(6), 1944. 42 Thaulow N, Sahu S. Materials Characterization, 2004, 53, 123. 43 Dominik N, Kasper E R, Emilie L, et al. Cement and Concrete Research, 2016, 79, 323. 44 Ellina B, Barbara L, Christophe C, et al. Cement and Concrete Research, 2019, 116, 309. 45 Yan N, Yue W. The handbook of inorganic metalloid materials atlas, Wuhan University of Technology Press, China, 2000(in Chinese). 杨南如, 岳文海. 无机非金属材料图谱手册, 武汉工业大学出版社, 2000. 46 Wang J, Niu D, Wang Y, et al. Constructure and Building Materials, 2018, 188, 520.
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2024, Vol. 38 
