冷热循环下纤维混凝土与高强钢筋间粘结强度损伤模型

摘要/Abstract

摘要： 通过对普通混凝土(PC)、钢纤维混凝土(SFRC)、聚丙烯纤维混凝土(PFRC)与HRB500E钢筋进行冷热循环作用后的中心拉拔试验,研究不同类型混凝土的劣化机理,分析冷热循环对PC、SFRC、PFRC的质量损失、相对动弹性模量以及粘结强度的影响。试验结果表明:冷热循环后,混凝土的质量损失和动弹性模量损失增加,钢筋与混凝土的粘结强度下降;掺入钢纤维、聚丙烯纤维的试件,其粘结强度衰减有所减弱,并且聚丙烯纤维的抑制效果更为明显。结合试验数据,对国内外的Petersen模型、Xu模型和Wu模型进行对比分析,同时考虑冷热循环对相对动弹性模量和相对粘结强度的影响,基于Weibull概率分布理论和强度衰减模型,建立了纤维混凝土与高强钢筋间粘结强度劣化模型,并通过本文数据对其进行了验证,粘结强度实测值与计算值比值的平均值为0.97,标准差为0.07,两者吻合良好,可为冷热环境下纤维混凝土结构耐久性设计提供理论参考。

关键词: 冷热循环, 纤维混凝土, Weibull概率分布, 粘结强度, 损伤模型

Abstract: Through the central pull-out test of ordinary concrete (PC), steel fiber reinforced concrete (SFRC), polypropylene fiber reinforced concrete (PFRC) and HRB500E steel bars after thermal-cold cycles, the deterioration mechanism of different types of concrete was studied, and the influences of thermal-cold cycles on mass loss, relative dynamic elastic modulus and bond strength of PC, SFRC and PFRC were analyzed. The results show that the mass loss and dynamic elastic modulus loss of concrete increase, and the bond strength between reinforcement and concrete decreases after thermal-cold cycles. When steel fiber and polypropylene fiber are added into the specimen, the attenuation of bond strength is weakened, and the inhibition effect of polypropylene fiber is more obvious. Combined with the experimental data, the Petersen model, Xu model and Wu model at home and abroad are compared and analyzed. Considering the influences of thermal-coal cycles on the relative dynamic modulus of elasticity and the relative bond strength, based on Weibull probability distribution theory and strength attenuation model, a bond strength degradation model of fiber reinforced concrete and high-strength steel bar is established, which is verified by the data in this paper. The average value of the ratio between measured value and calculated value is 0.97, and the standard deviation is 0.07, which are in good agreement. The model provides a theoretical reference for the durability design of fiber reinforced concrete structures under thermal-cold environment.

Key words: thermal-cold cycle, fiber reinforced concrete, Weibull probability distribution, bond strength, damage model

中图分类号:

TU528.572

张广泰, 李瑞祥, 刘诗拓, 阿迪力·赛买提, 耿天娇. 冷热循环下纤维混凝土与高强钢筋间粘结强度损伤模型[J]. 硅酸盐通报, 2021, 40(4): 1193-1204.

ZHANG Guangtai, LI Ruixiang, LIU Shituo, SAMAT Adil, GENG Tianjiao. Bond Strength Damage Model between Fiber Reinforced Concrete and High-Strength Steel Bars under Thermal-Cold Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1193-1204.

参考文献

[1] SUMARAC D, KRASULJA M. Damage of plain concrete due to thermal incompatibility of its phases[J]. International Journal of Damage Mechanics, 1998, 7(2): 129-142.
[2] 李清海,姚燕.热循环对水泥基材料抗压强度的影响及机理研究(英文)[J].硅酸盐学报,2006,34(10):1287-1289.
LI Q H, YAO Y. Influence of thermal cycles on the compressive strength of cement-based materials[J]. Journal of the Chinese Ceramic Society, 2006, 34(10): 1287-1289.
[3] CHEN L Z, YAO J T, ZHANG G T. Flexural properties of lithium slag concrete beams subjected to loading and thermal-cold cycles[J]. KSCE Journal of Civil Engineering, 2019, 23(2): 624-631.
[4] 冀晓东,宋玉普.冻融循环后光圆钢筋与混凝土粘结性能退化机理研究[J].建筑结构学报,2011,32(1):70-74.
JI X D, SONG Y P. Mechanism of bond degradation between concrete and plain steel bar after freezing and thawing[J]. Journal of Building Structures, 2011, 32(1): 70-74 (in Chinese).
[5] 冀晓东,赵宁,宋玉普.冻融循环作用后变形钢筋与混凝土粘结性能退化研究[J].工业建筑,2010,40(1):87-91.
JI X D, ZHAO N, SONG Y P. Experimental study on bond behavior’s deterioration between deformed steel bar and concrete after freezing and thawing[J]. Industrial Construction, 2010, 40(1): 87-91 (in Chinese).
[6] 李磊,王卓涵,张艺欣,等.冻融损伤钢筋混凝土构件黏结滑移本构模型研究[J/OL].建筑结构学报:1-10[2020-10-12].https://doi.org/10.14006/j.jzjgxb.2019.0415.
LI L, WANG Z H, ZHANG Y X, et al. Bond slip model adapted for reinforced concrete members subjected to freeze-thaw damage[J/OL]. Journal of Building Structures: 1-10[2020-10-12]. https://doi.org/10.14006/j.jzjgxb.2019.0415 (in Chinese).
[7] FAGERLUND G, SOMERVILLE G, JEPPSON J. Manual for assessing concrete structures affected by frost[M]. Lund Sweden, Lund Institute of Technology, 2001.
[8] PETERSEN L, LOHAUS L, POLAK M A. Influence of freezing-and-thawing damage on behavior of reinforced concrete elements[J]. ACI Materials Journal, 2007, 104(4): 369-378.
[9] XU S H, LI A B, WANG H. Bond properties for deformed steel bar in frost-damaged concrete under monotonic and reversed cyclic loading[J]. Construction and Building Materials, 2017, 148: 344-358.
[10] 李一,张广泰,田虎学,等.锂渣聚丙烯纤维混凝土基本力学性能试验[J].河南科技大学学报(自然科学版),2016,37(4):60-65+7.
LI Y, ZHANG G T, TIAN H X, et al. Basic mechanical properties experiment on lithium slag polypropylene fiber reinforced concrete[J]. Journal of Henan University of Science & Technology (Natural Science), 2016, 37(4): 60-65+7 (in Chinese).
[11] 张广泰,田虎学,李宝元,等.钢-聚丙烯混杂纤维混凝土的抗盐冻性能[J].材料导报,2018,32(14):2396-2399+2406.
ZHANG G T, TIAN H X, LI B Y, et al. Deicer-frost scaling of steel-polypropylene hybrid fiber reinforced concrete[J]. Materials Review, 2018, 32(14): 2396-2399+2406 (in Chinese).
[12] 陈克凡,乔宏霞,王鹏辉,等.温度循环退化模型的橡胶混凝土可靠寿命预估[J].华中科技大学学报(自然科学版),2020,48(2):42-46.
CHEN K F, QIAO H X, WANG P H, et al. Reliable life prediction of rubber concrete based on temperature cycle degradation model[J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2020, 48(2): 42-46 (in Chinese).
[13] AL RIKABI F T, SARGAND S M, KHOURY I, et al. Material properties of synthetic fiber-reinforced concrete under freeze-thaw conditions[J]. Journal of Materials in Civil Engineering, 2018, 30(6): 04018090.
[14] POWERS T C. A working hypothesis for further studies of frost resistance of concrete[J]. ACI Journal Proceedings, 1945, 41(1): 245-297.
[15] POWERS T E, HELLNUTH R A. Theory of volume changes in hardened cement paste during freezing[J]. Proceeding of the Highway Research Board, 1953, 32: 285- 297.
[16] 董祥,沈正.纤维品种和掺量对混凝土抗冻性及微观结构的影响[J].南京林业大学学报(自然科学版),2010,34(5):91-95.
DONG X, SHEN Z. Effects of fiber types and contents on frost resistance of concrete and their microstructure[J]. Journal of Nanjing Forestry University (Natural Science Edition), 2010, 34(5): 91-95 (in Chinese).
[17] 王晨飞,牛荻涛.纤维混凝土在盐冻作用下的耐久性研究[J].工业建筑,2012,42(1):137-139+153.
WANG C F, NIU D T. Research on the durability of polypropylene fiber concrete under freeze-thaw damage[J]. Industrial Construction, 2012, 42(1): 137-139+153 (in Chinese).
[18] CHAO S H, NAAMAN A E, PARRA-MONTESINOS G J. Bond behavior of reinforcing bars in tensile strain-hardening fiber-reinforced cement composites[J]. ACI Structural Journal, 2009, 106(6): 897-906.
[19] JIANG C, WU Y F, DAI M J. Degradation of steel-to-concrete bond due to corrosion[J]. Construction and Building Materials, 2018, 158: 1073-1080.
[20] WU Y F, ZHAO X M. Unified bond stress-slip model for reinforced concrete[J]. Journal of Structural Engineering, 2013, 139(11): 1951-1962.
[21] 雷刚.Weibull分布寿命数据的参数估计[D].武汉:华中科技大学,2006.
LEI G. Parameter estimation of Weibull distribution life data[D]. Wuhan: Huazhong University of Science and Technology, 2006 (in Chinese).
[22] 乔宏霞,郭向柯,朱彬荣.三参数Weibull分布的多因素作用下混凝土加速寿命试验[J].材料导报,2019,33(4):639-643.
QIAO H X, GUO X K, ZHU B R. Accelerated life test of concrete under multiple factors based on three-parameter Weibull distribution[J]. Materials Review, 2019, 33(4): 639-643 (in Chinese).
[23] 高峰,熊信,周科平,等.冻融循环作用下饱水砂岩的强度劣化模型[J].岩土力学,2019,40(3):926-932.
GAO F, XIONG X, ZHOU K P, et al. Strength deterioration model of saturated sandstone under freeze-thaw cycles[J]. Rock and Soil Mechanics, 2019, 40(3): 926-932 (in Chinese).