Temperature Control and Strength Development of Electric Heat Tracing Curing Concrete at -10 ℃

Abstract

Abstract: Electric heat tracing curing is an effective method to avoid early freezing damage of concrete, improve cement hydration and concrete strength in winter construction in recent years. In order to improve the curing efficiency and effect, and optimize the electric heat tracing curing parameters under negative temperature environment, the air sandwich method and the built-in method were adopted to lay the electric heat tracing bands. The temperature change history and the cube compressive strength of C30 ordinary concrete during the heating curing process were obtained by taking the pre-curing parameters and constant temperature curing parameters as variables. The results show that the temperature distribution of specimens cured by air sandwich method is more uniform, and the compressive strength of concrete cubes increases by 7.6% compared with the built-in method. The optimal pre-curing time at 35 ℃ is 6 h, the pre-curing time increases, the cost increases, but the strength increases inconspicuously. When pre-curing at 10 ℃ for 6 h and constant temperature curing at 55 ℃ for 36 h, the strength is 81.5%f_cu,k (cubic compressive strength standard value), which meets the requirements of plate mold removal strength. The purpose of this study is to provide reference for the design of concrete winter construction with electric heat tracing band, and then guide the construction method and engineering application.

Key words: concrete winter construction, electric heat tracing, curing temperature, curing time, temperature change history, strength development

CLC Number:

TU528.1

LIU Zhongyang, YANG Han, HUANG Yimiao, WANG Yige, WENG Weisu. Temperature Control and Strength Development of Electric Heat Tracing Curing Concrete at -10 ℃[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(10): 3508-3517.

References

[1] 中华人民共和国住房和城乡建设部. 建筑工程冬期施工规程: JGJ/T 104—2011[S]. 北京: 中国建筑工业出版社, 2011.
Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Construction regulations for winter period of construction engineering: JGJ/T 104—2011[S]. Beijing: China Architecture and Building Press, 2011 (in Chinese).
[2] 孟跃朋. 冬施现浇混凝土的电伴热养护法技术研究[D]. 北京: 北京交通大学, 2016.
MENG Y P. Study on electric heat tracing curing technology of cast-in-place concrete in winter[D]. Beijing: Beijing Jiaotong University, 2016 (in Chinese).
[3] LEE G C, HAN M C, BAEK D H, et al. Effect of heat curing methods on the temperature history and strength development of slab concrete for nuclear power plant structures in cold climates[J]. Nuclear Engineering and Technology, 2012, 44(5): 523-534.
[4] 严小卫, 刘昌永. 严寒地区大体积混凝土在不同保温措施下温度及强度发展研究[J]. 混凝土, 2020(7): 135-140+144.
YAN X W, LIU C Y. Development of temperature and strength for mass concrete under different insulation measures when constructed in severe cold area[J]. Concrete, 2020(7): 135-140+144 (in Chinese).
[5] 丛景迪. 外加自限温加热带在冬季混凝土的应用研究[D]. 沈阳: 沈阳建筑大学, 2018.
CONG J D. Study on the application of external self-limiting heating belt in winter concrete[D]. Shenyang: Shenyang Jianzhu University, 2018 (in Chinese).
[6] 刘琳, 赵文. 内埋热源混凝土冬季养护温度历程精确预控研究[J]. 东北大学学报(自然科学版), 2018, 39(3): 421-425.
LIU L, ZHAO W. Precise control of concrete temperature history for concrete buried heat source in winter[J]. Journal of Northeastern University (Natural Science), 2018, 39(3): 421-425 (in Chinese).
[7] 中华人民共和国住房和城乡建设部. 普通混凝土配合比设计规程: JGJ 55—2011[S]. 北京: 中国建筑工业出版社, 2011.
Ministry of Housing and Urban-Rural Development of the People’s Republic of China. Specifications for mix design of ordinary concrete: JGJ 55—2011[S]. Beijing: China Construction Industry Press, 2011 (in Chinese).
[8] 刘仲洋, 付帅, 马国伟, 等. 电伴热预养护条件对混凝土受冻临界强度的影响[J]. 硅酸盐通报, 2022, 41(6): 1990-1997.
LIU Z Y, FU S, MA G W, et al. Effect of electric heat tracing pre-curing condition on critical strength of concrete[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(6): 1990-1997 (in Chinese).
[9] 刘琳. 内埋热源早龄期混凝土热湿特性与变形[M]. 北京: 中国纺织出版社, 2022.
LIU L. Thermal and moisture characteristics and deformation of early-age concrete with internal heat source[M]. Beijing: China Textile Publishing House, 2022 (in Chinese).
[10] KIM J K, HAN S H, SONG Y C. Effect of temperature and aging on the mechanical properties of concrete[J]. Cement and Concrete Research, 2002, 32(7): 1087-1094.
[11] SHI J Y, LIU B J, ZHOU F, et al. Heat damage of concrete surfaces under steam curing and improvement measures[J]. Construction and Building Materials, 2020, 252: 119104.
[12] KIM T, RENS K L. Concrete maturity method using variable temperature curing for normal and high-strength concrete. I: experimental study[J]. Journal of Materials in Civil Engineering, 2008, 20(12): 727-734.
[13] ARALDI P, BALESTRA C, SAVARIS G. Influence of multiple methods and curing temperatures on the concrete compressive strength[J]. Journal of Engineering, Project, and Production Management, 2019: 9(2): 66-73.
[14] 钟翔, 李北星. 温度匹配养护对大掺量矿物掺合料混凝土抗压强度及早期水化性能的影响[J]. 硅酸盐通报, 2019, 38(10): 3080-3086.
ZHONG X, LI B X. Effect of temperature match curing on compressive strength and early hydration properties of concrete with high volume of mineral admixture[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(10): 3080-3086 (in Chinese).
[15] 阎培渝, 王强. 变温条件下粉煤灰对混凝土抗压强度的影响[J]. 混凝土, 2008(3): 1-3.
YAN P Y, WANG Q. Influence of fly ash on the compressive strength of concrete under temperature match curing conditions[J]. Concrete, 2008(3): 1-3 (in Chinese).
[16] 崔正龙, 张雪虹, 唐博. 不同养护环境对粉煤灰混凝土强度及碳化性能的影响[J]. 硅酸盐通报, 2019, 38(1): 65-69+76.
CUI Z L, ZHANG X H, TANG B. Effect of different curing environments on strength and carbonation of fly ash concrete[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(1): 65-69+76 (in Chinese).
[17] 贺炯煌, 马昆林, 龙广成, 等. 蒸汽养护过程中混凝土力学性能的演变[J]. 硅酸盐学报, 2018, 46(11): 1584-1592.
HE J H, MA K L, LONG G C, et al. Mechanical properties evolution of concrete in steam-curing process[J]. Journal of the Chinese Ceramic Society, 2018, 46(11): 1584-1592 (in Chinese).
[18] 赵晶, 于一鸣, 荀武举, 等. 蒸养制度对混凝土抗压强度及抗渗性能影响的研究[J]. 低温建筑技术, 2020, 42(7): 36-39.
ZHAO J, YU Y M, XUN W J, et al. Effect of steam curing system on compressive strength and impermeability of concrete[J]. Low Temperature Architecture Technology, 2020, 42(7): 36-39 (in Chinese).
[19] HAMADA H, ALATTAR A, TAYEH B, et al. Influence of different curing methods on the compressive strength of ultra-high-performance concrete: a comprehensive review[J]. Case Studies in Construction Materials, 2022, 17: e01390.
[20] ZHOU Y C, ZHAN Y J, ZHU M T, et al. A review of the effects of raw material compositions and steam curing regimes on the performance and microstructure of precast concrete[J]. Materials, 2022, 15(8): 2859.
[21] SHI J Y, LIU B J, SHEN S, et al. Effect of curing regime on long-term mechanical strength and transport properties of steam-cured concrete[J]. Construction and Building Materials, 2020, 255: 119407.
[22] YANG Q B, YANG Q R, ZHU P R. Scaling and corrosion resistance of steam-cured concrete[J]. Cement and Concrete Research, 2003, 33(7): 1057-1061.