静水压力下超高性能混凝土的抗氯离子渗透性能

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (8): 2706-2715.

静水压力下超高性能混凝土的抗氯离子渗透性能

韦建刚^1,2, 陈荣¹, 黄伟¹, 陈镇东¹, 陈宝春¹, 陈培标³, 朱卫东³

1.福州大学土木工程学院,福州 350116;
2.福建工程学院土木工程学院,福州 350108;
3.福建鸿生材料科技股份有限公司,福州 350314

收稿日期:2022-04-04 修回日期:2022-05-11 出版日期:2022-08-15 发布日期:2022-08-30
通讯作者: 黄伟,博士,助理研究员。E-mail:WeiHuang@fzu.edu.cn
作者简介:韦建刚(1971—),男,博士,研究员。主要从事超高性能混凝土复合材料研究。E-mail:weijg@fzu.edu.cn
基金资助:
福建省高校产学研联合创新项目(2022H6009);福建省自然科学基金(2021J05124);先进土木工程材料教育部重点实验室开放基金(202002);福州市科技计划项目(2020-S-36)

Chloride Penetration Resistance of Ultra-High Performance Concrete under Hydrostatic Pressure

WEI Jiangang^1,2, CHEN Rong¹, HUANG Wei¹, CHEN Zhendong¹, CHEN Baochun¹, CHEN Peibiao³, ZHU Weidong³

1. College of Civil Engineering, Fuzhou University, Fuzhou 350116, China;
2. College of Civil Engineering, Fujian University of Technology, Fuzhou 350108, China;
3. Fujian Hongsheng Materials Technology Co., Ltd., Fuzhou 350314, China

Received:2022-04-04 Revised:2022-05-11 Online:2022-08-15 Published:2022-08-30

摘要/Abstract

摘要： 本文通过氮气吸附和脱附试验对超高性能混凝土(UHPC)的孔结构进行分析,研究了钢纤维体积掺量和矿物掺合料体积掺量对UHPC在不同静水压力作用下氯离子传输行为的影响,并结合扫描电镜和能谱仪进行UHPC的微观形貌分析。结果表明:钢纤维的掺入增大了UHPC基体孔隙体积,矿渣的掺入能够降低基体孔隙率,早期蒸养后再标准养护至28 d时,大量掺入粉煤灰会使总孔隙率增大;随着静水压力的增大,同一深度下的氯离子浓度和表观氯离子扩散系数也增大,在2 MPa作用下更为显著;自由氯离子含量和总氯离子含量呈线性关系,钢纤维的掺入降低了氯离子结合能力,而矿渣和粉煤灰的掺入能有效提升氯离子结合率,氯离子结合率最高可达到46.29%;扫描电镜和能谱分析试验发现钢纤维锈蚀仅发生在UHPC表面。

关键词: 超高性能混凝土, 静水压力, 孔结构, 氯离子传输, 氯离子结合能力, 表观氯离子扩散系数

Abstract: The pore structure of ultra-high performance concrete (UHPC) was analyzed by nitrogen adsorption and desorption (NAD) test in this paper. The influence of steel fiber and mineral admixture on the chloride ion transport behavior of UHPC under different hydrostatic pressures were investigated.Scanning electron microscope and energy dispersive spectrometer analysis were conducted to examine the microstructure of UHPC. The results show that the addition of steel fiber increases the porosity of UHPC matrix, while the variation is not obvious. The addition of slag reduces the porosity of matrix. When the early steam curing is followced by standard curing to 28 d,a large amount of fly ash increases total porosity. The chloride ion concentration and apparent chloride diffusion coefficient at the same depth increase with the increment of hydrostatic pressure, which is more significant under the pressure of 2 MPa. It is found that the linear relationship exist in the content of free chloride ions and the content of total chloride ions. The incorporation of steel fiber reduces the chloride binding ability, while the incorporation of slag and fly ash effectively improves the binding rate of chloride ion,and the maximum chloride binding rate reaches 46.29%. Scanning electron microscope and energy dispersive spectrometer observation suggest that the corrosion of steel fiber only occurs on the surface of UHPC.

Key words: ultra-high performance concrete, hydrostatic pressure, pore structure, chloride ion transport, chloride binding capacity, apparent chloride diffusion coefficient

中图分类号:

TU528

韦建刚, 陈荣, 黄伟, 陈镇东, 陈宝春, 陈培标, 朱卫东. 静水压力下超高性能混凝土的抗氯离子渗透性能[J]. 硅酸盐通报, 2022, 41(8): 2706-2715.

WEI Jiangang, CHEN Rong, HUANG Wei, CHEN Zhendong, CHEN Baochun, CHEN Peibiao, ZHU Weidong. Chloride Penetration Resistance of Ultra-High Performance Concrete under Hydrostatic Pressure[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2706-2715.

参考文献

[1] WANG D H, SHI C J, WU Z M, et al. A review on ultra high performance concrete: part Ⅱ. Hydration, microstructure and properties[J]. Construction and Building Materials, 2015, 96: 368-377.
[2] 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.
CHEN B C, JI T, HUANG Q W, et al. Review of research on ultra-high performance concrete[J]. Journal of Architecture and Civil Engineering, 2014, 31(3): 1-24 (in Chinese).
[3] LI J Q, WU Z M, SHI C J, et al. Durability of ultra-high performance concrete: a review[J]. Construction and Building Materials, 2020, 255: 119296.
[4] LI X S, SHUI Z H, YU R, et al. Magnesium induced hydration kinetics of ultra-high performance concrete (UHPC) served in marine environment: experiments and modelling[J]. Construction and Building Materials, 2019, 224: 1056-1068.
[5] SONG Q L, YU R, SHUI Z H, et al. Macro/micro characteristics variation of ultra-high performance fibre reinforced concrete (UHPFRC) subjected to critical marine environments[J]. Construction and Building Materials, 2020, 256: 119458.
[6] KONO K, MUSHA H, KAWAGUCHI T, et al. Durability study of the first PC bridge constructed with ultra-high strength fiber reinforced concrete in Japan[C]//2nd International Symposium on Ultra-High Performance Fibre-Reinforced Concrete (UHPFRC), Marseille, France, 2013: 239-248.
[7] ABBAS S, SOLIMAN A M, NEHDI M L. Exploring mechanical and durability properties of ultra-high performance concrete incorporating various steel fiber lengths and dosages[J]. Construction and Building Materials, 2015, 75: 429-441.
[8] THOMAS M, GREEN B, O'NEAL E, et al. Marine performance of UHPC at Treat Island[C]//3rd International Symposium on UHPC and Nanotechnology for High Performance Construction Materials, Kassel, Germany, 2012: 365-370.
[9] 王月,安明喆,余自若,等.冻融循环作用下活性粉末混凝土中的氯离子分布及扩散系数[J].建筑材料学报,2016,19(5):810-815+820.
WANG Y, AN M Z, YU Z R, et al. Chloride ion distribution and diffusion coefficient of reactive powder concrete under freeze-thaw cycling[J]. Journal of Building Materials, 2016, 19(5): 810-815+820 (in Chinese).
[10] 马志鸣,赵铁军,赵彦迪,等.静水压力下混凝土中氯离子传输特性试验研究[J].公路,2012,57(12):168-171.
MA Z M, ZHAO T J, ZHAO Y D, et al. Experiment and study on transmission characters of chloride in concrete under hydrostatic pressure[J]. Highway, 2012, 57(12): 168-171 (in Chinese).
[11] 赵彦迪.静水压力下混凝土中氯离子传输机理研究[D].青岛:青岛理工大学,2011.
ZHAO Y D. Study on the transmission mechanism of chloride in concrete under hydrostatic pressure[D]. Qingdao: Qingdao Tehcnology University, 2011 (in Chinese).
[12] 黄伟.矿物掺合料对超高性能混凝土的水化及微结构形成的影响[D].南京:东南大学,2017.
HUANG W. Effect of supplementary cementitious materials on the hydration and microstructural development of ultra-high performance concrete[D]. Nanjing: Southeast University, 2017 (in Chinese).
[13] HUANG W, KAZEMI-KAMYAB H, SUN W, et al. Effect of cement substitution by limestone on the hydration and microstructural development of ultra-high performance concrete (UHPC)[J]. Cement and Concrete Composites, 2017, 77: 86-101.
[14] 中华人民共和国住房和城乡建设部.普通混凝土长期性能和耐久性能试验方法标准:GB/T 50082—2009[S].北京:中国建筑工业出版社,2009.
Ministry of Housing and Urban-Rural Development, PRC. Standard of test method for long-term performance and durability of ordinary concrete: GB/T 50082—2009[S]. Beijing: China Architecture and Architecture Press, 2009 (in Chinese).
[15] 元强.水泥基材料中氯离子传输试验方法的基础研究[D].长沙:中南大学,2009.
YUAN Q. Fundamental studies on test methods for the transport of chloride ions in cementitious materials[D]. Changsha: Central South University, 2009 (in Chinese).
[16] KADLEC O, DUBININ M. Comments on the limits of applicability of the mechanism of capillary condensation[J]. Journal of Colloid and Interface Science, 1969, 31(4): 479-489.
[17] GROEN J C, PEFFER L A A, PÉREZ-RAMÍREZ J. Pore size determination in modified micro- and mesoporous materials. Pitfalls and limitations in gas adsorption data analysis[J]. Microporous and Mesoporous Materials, 2003, 60(1/2/3): 1-17.
[18] YU R, SPIESZ P, BROUWERS H J H. Mix design and properties assessment of ultra-high performance fibre reinforced concrete (UHPFRC)[J]. Cement and Concrete Research, 2014, 56: 29-39.
[19] MILOUD B. Permeability and porosity characteristics of steel fiber reinforced concrete[J]. Asian Journal of Civil Engineering, 2005, 6(4): 317-330.
[20] OGIRIGBO O R, BLACK L. Chloride binding and diffusion in slag blends: influence of slag composition and temperature[J]. Construction and Building Materials, 2017, 149: 816-825.
[21] FRANCO-LUJÁN V A, MENDOZA-RANGEL J M, JIMÁNEZ-QUERO V G, et al. Chloride-binding capacity of ternary concretes containing fly ash and untreated sugarcane bagasse ash[J]. Cement and Concrete Composites, 2021, 120: 104040.
[22] TANG L P, GULIKERS J. On the mathematics of time-dependent apparent chloride diffusion coefficient in concrete[J]. Cement and Concrete Research, 2007, 37(4): 589-595.
[23] MOHAMMED T U, HAMADA H. Relationship between free chloride and total chloride contents in concrete[J]. Cement and Concrete Research, 2003, 33(9): 1487-1490.
[24] CHEEWAKET T, JATURAPITAKKUL C, CHALEE W. Long term performance of chloride binding capacity in fly ash concrete in a marine environment[J]. Construction and Building Materials, 2010, 24(8): 1352-1357.
[25] CHALEE W, SASAKUL T, SUWANMANEECHOT P, et al. Utilization of rice husk-bark ash to improve the corrosion resistance of concrete under 5-year exposure in a marine environment[J]. Cement and Concrete Composites, 2013, 37: 47-53.
[26] 陈书苹.改善混凝土结合氯离子性能的研究[D].长沙:中南大学,2007.
CHEN S P. Study on the improvement of chloride ions binding of concrete[D]. Changsha: Central South University, 2007 (in Chinese).
[27] IPAVEC A, VUK T, GABROVŠEK R, et al. Chloride binding into hydrated blended cements: the influence of limestone and alkalinity[J]. Cement and Concrete Research, 2013, 48: 74-85.
[28] YUAN Q, SHI C J, DE SCHUTTER G, et al. Chloride binding of cement-based materials subjected to external chloride environment: a review[J]. Construction and Building Materials, 2009, 23(1): 1-13.
[29] 孙丛涛,宋华,牛荻涛,等.粉煤灰混凝土的氯离子结合性能[J].建筑材料学报,2016,19(1):35-39.
SUN C T, SONG H, NIU D T, et al. Chloride binding capacity of fly ash concrete[J]. Journal of Building Materials, 2016, 19(1): 35-39 (in Chinese).