钙铝类水滑石对混凝土抗盐冻性能的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (9): 3084-3090.

钙铝类水滑石对混凝土抗盐冻性能的影响

单继雄^1,2, 李军^1,2, 侯永生^1,2, 胡艳民^1,2, 刘畅³

1.河北省道路结构与材料工程技术研究中心,石家庄 050091;
2.河北交规院瑞志交通技术咨询有限公司,石家庄 050091;
3.中交建冀交高速公路投资发展有限公司,石家庄 050000

收稿日期:2022-05-02 修回日期:2022-06-23 出版日期:2022-09-15 发布日期:2022-09-27
作者简介:单继雄(1988—),男,工程师。主要从事高性能混凝土研究。E-mail:457261549@qq.com
基金资助:
河北省交通运输科技项目(JX-202013)

Influence of Calcium-Aluminum Hydrotalcite on Salt-Frost Resistance of Concrete

SHAN Jixiong^1,2, LI Jun^1,2, HOU Yongsheng^1,2, HU Yanmin^1,2, LIU Chang³

1. Hebei Provincial Research Center of Road Structures and Material Engineering Technologies, Shijiazhuang 050091, China;
2. Hebei Provincial Communications Planning Design and Research Institute Ruizhi Transportation Technology Consulting Co., Ltd., Shijiazhuang 050091, China;
3. Zhong Jiao Jian Ji Jiao Highway Investment Development Co., Ltd., Shijiazhuang 050000, China

Received:2022-05-02 Revised:2022-06-23 Online:2022-09-15 Published:2022-09-27

摘要/Abstract

摘要： 以氯盐为主要成分的除冰盐会导致混凝土发生盐冻破坏,而钙铝类水滑石(CAHL)可以对氯离子进行吸附固化。为研究CAHL对混凝土抗盐冻性能的影响,在C30混凝土中分别掺加胶凝材料质量0%、0.5%、1.0%、1.5%、2.0%的CAHL,测试不同CAHL含量对混凝土抗压强度、电通量、盐冻剥落质量、自由氯离子浓度的影响。结果表明:当CAHL掺量≤1.5%时,随着掺量的增加,混凝土的抗压强度逐渐增大,而电通量逐渐降低,说明合适的CAHL掺量可以提高混凝土的致密性;随CAHL掺量的增加,Friedel's盐的衍射峰逐渐增强,说明CAHL可以较好地固化氯离子;CAHL通过提高混凝土致密性和固化氯离子有效降低了盐冻条件下混凝土中的自由氯离子含量;与空白样相比,CAHL掺量为1.5%时的混凝土经28次单面盐冻剥落后质量损失下降22.9%。

关键词: 混凝土, 类水滑石, 氯离子, 抗盐冻性能, 氯离子固化, 盐冻剥落

Abstract: Deicing salt with chlorine salt as main component can cause salt-frost damage to concrete, while Ca-Al hydrotalcite (CAHL) can adsorb and solidify chloride ion. In order to study the influence of CAHL on the salt-frost resistance of concrete, CAHL with the mass fraction of 0%, 0.5%, 1.0%, 1.5% and 2.0% of cementing material was added into C30 concrete, and the influence of different CAHL content on compressive strength, electric flux, salt-frost spalling mass and free chloride ion concentration of concrete was tested. The results show that when the content of CAHL is ≤1.5%, the compressive strength of concrete increases gradually with the increase of CAHL content, while the electric flux decreases gradually, indicating that CAHL can improve the compactness of concrete better under the appropriate content of CAHL. The diffraction peak of Friedel's salt increases gradually with the increase of CAHL content, indicating that CAHL can solidify chloride ion well. By improving the compactness of concrete and solidifying chloride ion, the content of free chloride ion in concrete under salt-frost condition is effectively reduced after adding CAHL. Compared with the blank sample, the mass loss of concrete with CAHL content of 1.5% decreases by 22.9% after 28 times single-sided salt-frost spalling.

Key words: concrete, hydrotalcite, chloride ion, salt-frost resistance, chloride ion solidification, salt-frost spalling

中图分类号:

TU528

单继雄, 李军, 侯永生, 胡艳民, 刘畅. 钙铝类水滑石对混凝土抗盐冻性能的影响[J]. 硅酸盐通报, 2022, 41(9): 3084-3090.

SHAN Jixiong, LI Jun, HOU Yongsheng, HU Yanmin, LIU Chang. Influence of Calcium-Aluminum Hydrotalcite on Salt-Frost Resistance of Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(9): 3084-3090.

参考文献

[1] 杨博渊.混凝土除冰盐冻害性能退化及改善措施研究[D].徐州:中国矿业大学,2016.
YANG B Y. Studies about the degradation of concrete frost resistance subjected to deicing salt and improvement measures[D]. Xuzhou: China University of Mining and Technology, 2016 (in Chinese).
[2] 李志军.水泥混凝土抗盐冻性能试验研究[D].西安:长安大学,2018.
LI Z J. Test study on the salt resistance of cement concrete[D]. Xi'an: Chang'an University, 2018 (in Chinese).
[3] 朱昀喆.纳米改性混凝土的抗盐冻性能及其改性机理研究[D].哈尔滨:哈尔滨工业大学,2015.
ZHU Y Z. Research on salt scaling resistance and modification mechanism of nano-modified concrete[D]. Harbin: Harbin Institute of Technology, 2015 (in Chinese).
[4] LIU Z C, HANSEN W. Freeze-thaw durability of high strength concrete under deicer salt exposure[J]. Construction and Building Materials, 2016, 102: 478-485.
[5] 闫西乐.孔结构对水泥基材料抗盐冻性能影响规律的研究[D].南京:东南大学,2015.
YAN X L. Influence of pore structure on cement-based materials frost resistance property[D]. Nanjing: Southeast University, 2015 (in Chinese).
[6] 杨全兵.混凝土盐冻破坏机理(Ⅰ):毛细管饱水度和结冰压[J].建筑材料学报,2007,10(5):522-527.
YANG Q B. Mechanisms of deicer-frost scaling of concrete (Ⅰ): capillary-uptake degree of saturation and ice-formation pressure[J]. Journal of Building Materials, 2007, 10(5): 522-527 (in Chinese).
[7] 杨全兵.混凝土盐冻破坏机理(Ⅱ):冻融饱水度和结冰压[J].建筑材料学报,2012,15(6):741-746.
YANG Q B. One of mechanisms on the deicer-frost scaling of concrete (Ⅱ): degree of saturation and ice-formation pressure during freezing-thawing cycles[J]. Journal of Building Materials, 2012, 15(6): 741-746 (in Chinese).
[8] 孙洪超.多掺合料情况下水泥混凝土抗盐冻机理剖析及性能优化[D].长春:吉林大学,2018.
SUN H C. Analysis of salt freezing mechanism and performance optimization of concrete with multi-admixtures[D]. Changchun: Jilin University, 2018 (in Chinese).
[9] 张立群,贾辰辰,张晓冉,等.矿物掺合料和引气剂对混凝土抗盐冻性能影响的研究[J].新型建筑材料,2018,45(12):5-9.
ZHANG L Q, JIA C C, ZHANG X R, et al. Study on the influence of mineral admixtures and air-entraining agents on the salt-freezing resistance performance of concrete[J]. New Building Materials, 2018, 45(12): 5-9 (in Chinese).
[10] 张恒春,唐方宇,季锡贤,等.超细矿物掺合料对高强混凝土干燥收缩影响[J].硅酸盐通报,2017,36(7):2514-2518.
ZHANG H C, TANG F Y, JI X X, et al. Influence of superfine minerals admixture on drying shrinkage of high strength concrete[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(7): 2514-2518 (in Chinese).
[11] 冯跃,耿健,李东.焙烧水滑石对砂浆中氯离子渗透的影响[J].硅酸盐通报,2018,37(4):1195-1199.
FENG Y, GENG J, LI D. Influence of calcined hydrotalcite on chloride penetration in mortar[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(4): 1195-1199 (in Chinese).
[12] 李东,朱月圆,耿健,等.矿物掺合料和CLDH对水泥基材料氯离子固化性能研究[J].西安建筑科技大学学报(自然科学版),2019,51(3):344-349.
LI D, ZHU Y Y, GENG J, et al. A study on curing charateristics of chloride ions binding in cement based materials with mineral admixture and CLDH[J]. Journal of Xi'an University of Architecture & Technology (Natural Science Edition), 2019, 51(3): 344-349 (in Chinese).
[13] YOON S, MOON J, BAE S, et al. Chloride adsorption by calcined layered double hydroxides in hardened Portland cement paste[J]. Materials Chemistry and Physics, 2014, 145(3): 376-386.
[14] 王佩.焙烧水滑石水泥基复合材料抗盐冻性能研究[D].西安:长安大学,2020.
WANG P. Study on salt freezing resistance of calcined hydrotalcite cement-based composites[D]. Xi'an: Chang'an University, 2020 (in Chinese).
[15] 李战国,纪文军,李悦,等.层状双金属氢氧化物在水泥混凝土中的应用研究进展[J].混凝土,2021(1):25-30+35.
LI Z G, JI W J, LI Y, et al. Research progress on application of layered double hydroxides in cement concrete[J]. Concrete, 2021(1): 25-30+35 (in Chinese).
[16] 唐宁,岑文飞,赵明宇,等.钙铝水滑石在水泥基材料中的氯离子固化行为研究[J].沈阳建筑大学学报(自然科学版),2021,37(5):900-906.
TANG N, CEN W F, ZHAO M Y, et al. Chloride ions binding of calcium-aluminum hydrotalcite in cementitious material[J]. Journal of Shenyang Jianzhu University (Natural Science), 2021, 37(5): 900-906 (in Chinese).
[17] 陈宇轩.LDHs材料固化氯离子机理及其在水泥基材料中的应用[D].武汉:武汉理工大学,2015.
CHEN Y X. Mechanism of chloride binding of LDHs and its application in cement-based material[D]. Wuhan: Wuhan University of Technology, 2015 (in Chinese).
[18] CHEN Y X, SHUI Z H, CHEN W, et al. Chloride binding of synthetic Ca-Al-NO₃ LDHs in hardened cement paste[J]. Construction and Building Materials, 2015, 93: 1051-1058.
[19] 中华人民共和国住房和城乡建设部,国家市场监督管理总局.混凝土物理力学性能试验方法标准:GB/T 50081—2019[S].北京:中国建筑工业出版社,2019.
Ministry of Housing and Urban-Rural Development of the People's Republic of China, State Administration for Market Regulation. Standard of test methods of concrete physical and mechanical properties: GB/T 50081—2019[S]. Beijing: China Architecture and Building Press, 2019 (in Chinese).
[20] 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 of the People's Republic of China. Standard of test methods for long-term performance and durability of ordinary concrete: GB/T 50082—2009[S]. Beijing: China Architecture and Building Press, 2009 (in Chinese).
[21] 中华人民共和国交通运输部.水运工程混凝土试验检测技术规范:JTS/T 236—2019[S].北京:人民交通出版社,2019.
Ministry of Communications of the People's Republic of China. Technical specification for concrete testing of port and waterway engineering: JTS/T 236—2019[S]. Beijing: People's Communications Press, 2019 (in Chinese).