Carbonization Mechanism of Reactive Powder Concrete with Sea-water and Sea Sand
LI Tianyu1, LIU Xiaoyan1, ZHANG Yumei1, XIONG Chuansheng2, CAO Wenkai3, LI Weihua1,3
1 College of Mechanics and Materials, Hohai University, Nanjing 210098, China; 2 College of Civil Engineering, Qingdao University of Technology, Qingdao 266033, China; 3 School of Chemical Engineering and Technology, Sun Yat-Sen University, Zhuhai 519000, China
Abstract: In this paper, the carbonation resistance of brine marine sand high performance concrete made from abundant sea sand resources was stu-died.The surface hardness of brine marine sand high performance concrete at different stages of carbonization was studied by means of the durometer, its microscopic composition and morphology were studied by XRD and SEM, and its pH variation was tested by a acidity meter.The results showed that: (1) The carbonation depth of brine marine sand high performance concrete was measured as 0 by using the indicator met-hod, and the actual carbonation depth was found to be within 50—100 μm on the concrete surface by scanning electron microscope test. (2) After 28 days of carbonation, the pH of concrete pore solution decreased significantly, and the pH of concrete pore solution decreased along the direction of CO2 erosion.The larger pH variation is mainly concentrated within 3 mm from the surface, and the final pH is all above 10.5, greater than the critical value of passivation film disappearance (9.88). The pH of the standard curing specimens is all above 11.50, greater than the critical value of passivation film destruction. (3) Carbonization has little effect on the mechanical properties of brine marine sand high performance concrete, but the deposition of corrosion products on the surface of concrete can increase the surface hardness. (4) The carbonation of brine marine sand high performance concrete is actually the reaction of CO2 with Ca(OH)2, C-S-H gel, C3S, C2S and Friedel’s salt to generate CaCO3 and amorphous hydrated SiO2 covering the original concrete surface, increasing the carbonation resistance of concrete.
1 Niu D T. Durability and life forecast of reinforced concrete structure, Science Press, China, 2003(in Chinese). 牛荻涛. 混凝土结构耐久性与寿命预测, 科学出版社, 2003. 2 Han J D, Sun W, Pan G H. Journal of the Chinese Ceramic Society, 2012, 40(8),1143(in Chinese). 韩建德, 孙伟, 潘钢华. 硅酸盐学报,2012, 40(8), 1143. 3 Yang J. Study on carbonation and gas permeability of concrete. Ph.D. Thesis, Shandong University of Science and Technology, China, 2004(in Chinese). 杨军.混凝土的碳化性能与气渗性能研究. 博士学位论文, 山东科技大学, 2004. 4 Papadakis V G, Vayenas C G, Fardis M N. ACI Materials Journal, 1991, 88(4),363. 5 Meier S A, Peter M A, Muntean A. Chemical Engineering Science, 2007, 62, 1125. 6 Xu C, Wang C K, Jin W L. Journal of Building Materials, 2011, 6(3),376(in Chinese). 许晨, 王传坤, 金伟良. 建筑材料学报,2011, 6(3), 376. 7 Papadarkis V G, Vayenas C G, Fardis M N. ACI Materials Journal, 1991, 88(8),363. 8 Liu Z Y, Sun W, Lv Y G, et al. Industrial Construction, 2005, 35(10), 50(in Chinese). 刘志勇, 孙伟, 吕永高, 等. 工业建筑, 2005, 35(10),50. 9 Zhang P, Zhao T J, Guo P G, et al. Journal of Southeast University: Natural Science, 2006, 36(SupⅡ),238(in Chinese). 张鹏, 赵铁军, 郭平功, 等.东南大学学报: 自然科学版, 2006, 36(增刊Ⅱ),238. 10 David R L. CRC handbook of chemistry and physics different groups, Boca Raton: CRC Press, 2005. 11 Yuan C F, Niu D T, Duan F Z, et al.Building of the Chinese Ceramic Society. 2011(5), 1126(in Chinese). 元成方, 牛荻涛, 段付珍, 等.硅酸盐通报. 2011(5),1126. 12 Liu S F, Sun W, et al.Journal of the Chinese Ceramic Society, 2003(11), 1080(in Chinese). 刘斯凤, 孙伟, 等.硅酸盐学报, 2003(11), 1080. 13 Wang Y, Niu D T, Miao Y Y. Journal of Building Materials, 2014, 17(4), 579(in Chinese). 王艳, 牛荻涛, 苗元耀. 建筑材料学报, 2014, 17(4), 579. 14 Huo H L. Building of the Chinese Ceramic Society, 2016(5),1642(in Chinese). 霍洪磊. 硅酸盐通报. 2016(5),1642. 15 Szilagyi K, Borosnyoi A, Zsigovics I. Construction and Building Mate-rials, 2011, 25(5),2480. 16 Ruan X, Liu X, Chen A R.Journal of Tongji University(Natural Scie-nce), 2013(2), 191(in Chinese). 阮欣, 刘栩, 陈艾荣.同济大学学报(自然科学版), 2013(2), 191. 17 Roux N, Andrade C, Sanjuan M A.Journal of Materials in Civil Engineering, 1996,2,1. 18 Song S M, Wei C X. Concrete, 2006(2),72(in Chinese). 宋少民, 未翠霞. 混凝土, 2006(2),72. 19 Niu D T, Dong Z P, Pu Y X. Industrial Construction, 1999, 29(9), 41(in Chinese). 牛荻涛, 董振平, 浦聿修.工业建筑, 1999, 29(9), 41. 20 Xu L P, Huang S Y. Journal of Shanghai Institute of Building of Mate-rials, 1991, 4(4),347(in Chinese). 许丽萍, 黄士元.上海建材学院学报, 1991, 4(4), 347. 21 Zhang Y, Jiang L X. Industrial Construction, 1998, 28(1), 16(in Chinese). 张誉, 蒋利学. 工业建筑, 1998, 28(1), 16. 22 Li G, Yuan Y S, Geng O.Concrete, 2004(11), 49(in Chinese). 李果, 袁迎曙, 耿欧.混凝土, 2004(11),49. 23 Papadarkis V G, Vayenas C G, Fardis M N.AICh E Journal, 1989, 35(10), 1639. 24 Papadarkis V G.Cement and Concrete Research, 2000, 30(2), 291. 25 Mc Polin D O, Basheer P A M, Long A E. Journal of Materials in Civil Engineering, 2009, 21(5), 217. 26 Liu Z Y. Study on methods of accelerated testing of marine concrete durability based on simulating environment and service life prediction. Ph.D. Thesis, Southeast University, China, 2006(in Chinese). 刘志勇. 基于环境的海工混凝土耐久性试验与寿命预测方法研究. 博士学位论文, 东南大学, 2006. 27 Zhou X L, Zhang S, Xie Y J. Concrete, 2010(4), 42(in Chinese). 周锡玲, 张胜, 谢友均. 混凝土, 2010(4), 42. 28 Liu J H, Song S M, Wang L.Journal of Wuhan University of Technology(Materials Science Edition), 2009,24(3),506. 29 W. Kurdowski. DOI 10.1007/978-94-007-7945-7-6 30 Zhang Y, Jiang L X, Zhang W P, et al. Durability of concrete structures. Shanghai Scientific & Technical Publishers, China, 2003(in Chinese). 张誉, 蒋利学, 张伟平, 等. 混凝土结构耐久性概论. 上海科学技术出版社, 2003. 31 Zhao S C. Highway, 2008(4),163(in Chinese). 赵尚传.公路, 2008(4),163. 32 Suryavanshi A K, Narayan S R. Cement and Concrete Research, 1996, 26(5), 729.
渝公网安备50019002502923号 版权所有：《材料导报》编辑部
2020, Vol. 34 
