粉煤灰掺量对海水海砂高性能混凝土性能的影响

硅酸盐通报 ›› 2022, Vol. 41 ›› Issue (5): 1677-1688.

粉煤灰掺量对海水海砂高性能混凝土性能的影响

张腾腾¹, 王传林^1,2, 张宇轩¹, 刘泽平¹

1.汕头大学土木与环境工程系,汕头 515063;
2.汕头大学广东省结构安全与监测工程技术研究中心,汕头 515063

收稿日期:2021-10-27 修回日期:2022-03-27 出版日期:2022-05-15 发布日期:2022-06-01
通讯作者: 王传林,博士,讲师。E-mail:clwang@stu.edu.cn
作者简介:张腾腾(1996—),女,硕士研究生。主要从事海水海砂混凝土的研究。E-mail:1710780706@qq.com
基金资助:
广东高校重点平台和科研项目(2021KQNCX021);汕头大学科研启动经费项目(NTF17011)

Effect of Fly Ash Content on Performance of High Performance Concrete with Seawater and Sea Sand

ZHANG Tengteng¹, WANG Chuanlin^1,2, ZHANG Yuxuan¹, LIU Zeping¹

1. Department of Civil and Environmental Engineering, Shantou University, Shantou 515063, China;
2. Guangdong Structural Safety and Monitoring Engineering Technology Research Center, Shantou University, Shantou 515063, China

Received:2021-10-27 Revised:2022-03-27 Online:2022-05-15 Published:2022-06-01

摘要/Abstract

摘要： 通过宏观力学性能、化学收缩、pH值、氯离子浓度等测试和SEM、XRD等微观表征研究粉煤灰掺量对海水海砂高性能混凝土性能的影响。结果表明:为维系钢筋钝化膜稳定,高温蒸养时粉煤灰掺量不宜大于30%(质量分数,下同),标养时粉煤灰掺量不宜大于50%;海水海砂高性能混凝土中游离Cl^-浓度随养护时间波动,前期先升高后骤降,后期缓慢增加,标养条件下Cl^-浓度明显低于高温蒸养条件下;海水海砂高性能混凝土具有早强性,其强度随粉煤灰掺量增加大致呈下降趋势,高温蒸养可明显提高混凝土抗折、抗压强度;粉煤灰掺量越多,残留的未水化颗粒越多,高温蒸养可有效改善混凝土微观结构,提高致密性;粉煤灰掺量过多或过少均会增加硅酸盐水泥体系的化学收缩,粉煤灰掺量为30%和40%时混凝土化学收缩值较小。

关键词: 海水海砂, 高性能混凝土, 粉煤灰, 高温蒸养, 标养, 水化机理

Abstract: The effect of fly ash content on the performance of seawater and sea sand high performance concrete was studied by carrying out experiments on mechanical properties, chemical shrinkage, pH value, chloride ion concentration, and microstructure. The results show that in order to maintain the stability of reinforcement passive film, the content of fly ash should not be greater than 30% (mass fraction, the same below) under high temperature steam curing and 50% under standard curing. The concentration of free Cl^- in seawater and sea sand high performance concrete fluctuates with curing time, increases first and then decreases sharply in the early stage, and increases slowly in the later stage. The Cl^- concentration under standard curing is significantly lower than that under high temperature steam curing. Seawater and sea sand high performance concrete has early strength, and its strength decreases with the increase of fly ash content. High temperature steam curing significantly improves the flexural and compressive strength of concrete. The more fly ash is added, the more unhydrated particles remain. High temperature steam curing effectively improves the microstructure and compactness of concrete. When fly ash content is too large or too small, it increases the chemical shrinkage of Portland cement. The chemical shrinkage value of concrete is small when the fly ash content is 30% and 40%.

Key words: seawater and sea sand, high performance concrete, fly ash, high temperature steam curing, standard curing, hydration mechanism

中图分类号:

TU528

张腾腾, 王传林, 张宇轩, 刘泽平. 粉煤灰掺量对海水海砂高性能混凝土性能的影响[J]. 硅酸盐通报, 2022, 41(5): 1677-1688.

ZHANG Tengteng, WANG Chuanlin, ZHANG Yuxuan, LIU Zeping. Effect of Fly Ash Content on Performance of High Performance Concrete with Seawater and Sea Sand[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(5): 1677-1688.

参考文献

[1] 陈宗平,王心月,陈宇良,等.海砂海水混凝土力学性能试验研究[J].混凝土,2020(11):1-7.
CHEN Z P, WANG X Y, CHEN Y L, et al. Experimental mechanical properties of seasand-seawater concrete[J]. Concrete, 2020(11): 1-7 (in Chinese).
[2] 卢予奇,赵羽习.海砂颗粒形态评价与海拌混凝土性能研究[J].海洋工程,2020,38(6):124-130.
LU Y Q, ZHAO Y X. Morphological evaluation of sea sand particles and basic properties of marine-mixed concrete[J]. The Ocean Engineering, 2020, 38(6): 124-130 (in Chinese).
[3] HASDEMIR S, TUĞRUL A, YILMAZ M. The effect of natural sand composition on concrete strength[J]. Construction and Building Materials, 2016, 112: 940-948.
[4] 李薛忠.基于钢筋锈蚀的海工混凝土结构耐久性能研究[D].镇江:江苏科技大学,2019.
LI X Z. Study on durability of seawater sea-sand concrete structure based on steel corrosion[D]. Zhenjiang: Jiangsu University of Science and Technology, 2019 (in Chinese).
[5] 王小刚,史才军,何富强,等.氯离子结合及其对水泥基材料微观结构的影响[J].硅酸盐学报,2013,41(2):187-198.
WANG X G, SHI C J, HE F Q, et al. Chloride binding and its effects on microstructure of cement-based materials[J]. Journal of the Chinese Ceramic Society, 2013, 41(2): 187-198 (in Chinese).
[6] ZIBARA H, HOOTON R D, THOMAS M D A, et al. Influence of the C/S and C/A ratios of hydration products on the chloride ion binding capacity of lime-SF and lime-MK mixtures[J]. Cement and Concrete Research, 2008, 38(3): 422-426.
[7] ELAKNESWARAN Y, NAWA T, KURUMISAWA K. Electrokinetic potential of hydrated cement in relation to adsorption of chlorides[J]. Cement and Concrete Research, 2009, 39(4): 340-344.
[8] SURYAVANSHI A K, SCANTLEBURY J D, LYON S B. The binding of chloride ions by sulphate resistant Portland cement[J]. Cement and Concrete Research, 1995, 25(3): 581-592.
[9] 王绍东,黄煜镔,王智.水泥组分对混凝土固化氯离子能力的影响[J].硅酸盐学报,2000,28(6):570-574.
WANG S D, HUANG Y B, WANG Z. Concrete resistance to chloride ingress: effect of cement composition[J]. Journal of the Chinese Ceramic Society, 2000, 28(6): 570-574 (in Chinese).
[10] BEN-YAIR M. The effect of chlorides on concrete in hot and arid regions[J]. Cement and Concrete Research, 1974, 4(3): 405-416.
[11] 李师财,于泳,金祖权.海水海砂混凝土力学性能与耐久性研究综述[J].硅酸盐通报,2020,39(12):3743-3752.
LI S C, YU Y, JIN Z Q. Review on mechanical properties and durability of seawater and sea-sand concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(12): 3743-3752 (in Chinese).
[12] SHI X M, YANG Z X, LIU Y J, et al. Strength and corrosion properties of Portland cement mortar and concrete with mineral admixtures[J]. Construction and Building Materials, 2011, 25(8): 3245-3256.
[13] 刘军,董必钦,邢锋,等.海砂氯离子与水泥胶体结合的模拟实验与结合机理[J].硅酸盐学报,2009,37(5):862-866+876.
LIU J, DONG B Q, XING F, et al. Simulation experiment and mechanism of the combining of sea sand type chlorine ions in cement materials[J]. Journal of the Chinese Ceramic Society, 2009, 37(5): 862-866+876 (in Chinese).
[14] 刘军,邢锋,董必钦,等.海砂型氯离子在混凝土中扩散的微观形貌分析[J].混凝土与水泥制品,2007(6):15-17.
LIU J, XING F, DONG B Q, et al. Diffusion of sea-sand’s chloride ions in concrete by analysing of SEM-EDS examination[J]. China Concrete and Cement Products, 2007(6): 15-17 (in Chinese).
[15] 邢锋,刘军,董必钦,等.海砂型氯离子与水泥胶体的结合和机理[J].东南大学学报(自然科学版),2006,36(s2):167-172.
XING F, LIU J, DONG B Q, et al. Combination procedure and mechanism of sea sand type chlorine ions with cement materials[J]. Journal of Southeast University (Natural Science Edition), 2006, 36(s2): 167-172 (in Chinese).
[16] 刘军,邢锋,董必钦,等.模拟海砂混凝土中氯离子扩散研究[J].混凝土,2008(3):33-35.
LIU J, XING F, DONG B Q, et al. Research of chloride diffusion in sea sand concrete[J]. Concrete, 2008(3): 33-35 (in Chinese).
[17] 柳俊哲,蒋义,贺智敏,等.海砂混凝土中氯离子固化的影响因素研究[J].材料导报,2013,27(20):129-132.
LIU J Z, JIANG Y, HE Z M, et al. Study on the influence factors of chloride ion binding in sea sand concrete[J]. Materials Review, 2013, 27(20): 129-132 (in Chinese).
[18] 汪家昆,吴相豪,李志卫,等.粉煤灰影响海水海洋骨料水泥基材料抗压强度试验研究[J].混凝土,2021(3):121-124.
WANG J K, WU X H, LI Z W, et al. Experimental study on compressive strength of cement-based materials of seawater and marine aggregate affected by fly ash[J]. Concrete, 2021(3): 121-124 (in Chinese).
[19] 何鹏涛,李新玲,沈卫国,等.模拟海水对高性能混凝土浆体的侵蚀作用研究[J].硅酸盐通报,2016,35(10):3319-3323.
HE P T, LI X L, SHEN W G, et al. Erosion effect on the high-performance concrete paste under simulative seawater[J]. Bulletin of the Chinese Ceramic Society, 2016, 35(10): 3319-3323 (in Chinese).
[20] 秦斌.海水海砂混凝土基本力学性能研究[J].混凝土,2019(2):90-91.
QIN B. Basic mechanical properties of seawater and sea sand concrete[J]. Concrete, 2019(2): 90-91 (in Chinese).
[21] 韩刚,王学志,辛明,等.海水海砂混凝土力学性能研究综述[J].辽宁工业大学学报(自然科学版),2021,41(6):405-408.
HAN G, WANG X Z, XIN M, et al. Summary of research on mechanical properties of marine sand concrete[J]. Journal of Liaoning University of Technology (Natural Science Edition), 2021, 41(6): 405-408 (in Chinese).
[22] 赵苏雅,吴庆,沈娇,等.海洋原材料制备的混凝土力学性能研究[J].混凝土,2021(10):48-51+56.
ZHAO S Y, WU Q, SHEN J, et al. Study on mechanical properties of concrete prepared from marine raw materials[J]. Concrete, 2021(10): 48-51+56 (in Chinese).
[23] 姚武,吴梦雪,魏永起.三元复合胶凝体系中硅灰和粉煤灰反应程度的确定[J].材料研究学报,2014,28(3):197-203.
YAO W, WU M X, WEI Y Q. Determination of reaction degree of silica fume and fly ash in a cement- silica fume- fly ash ternary cementitious system[J]. Chinese Journal of Materials Research, 2014, 28(3): 197-203 (in Chinese).