持续荷载与冻融循环耦合作用下纤维混凝土损伤性能研究

摘要/Abstract

摘要： 为了研究纤维混凝土在持续荷载与冻融循环耦合作用下的损伤性能,开展了不同压应力水平(0、0.3、0.5)作用下的纤维混凝土冻融循环试验,研究了不同应力水平作用下试件质量损失、相对动弹性模量和抗压强度损失等参数随冻融循环次数的变化规律。结合损伤力学,以超声波波速为损伤变量,分析了冻融损伤与荷载耦合作用的变化关系,并基于Weibull分布建立了冻融损伤预测模型,推导出冻融损伤与抗压强度的演化方程。结果表明,随着冻融循环次数的增加,冻融损伤程度表现出加剧上升的现象,应力水平为0.3的耦合作用能减小纤维混凝土的冻融损伤,应力水平为0.5的耦合作用会进一步加剧纤维混凝土的冻融损伤。建立的损伤预测模型具备较高的可行性,能够较精准预测不同冻融循环次数后的损伤,推导的演化方程相关性较好,能灵活实现损伤与强度之间的转化。

关键词: 纤维混凝土, 冻融循环, 耦合作用, 损伤性能, 持续荷载, 预测模型

Abstract: In order to study the damage performance offiber concrete under the coupling effect of continuous loading and freeze-thaw cycles, the freeze-thaw cycle experiment of fiber concrete was performed under the effect of different compressive stress levels (0, 0.3, 0.5), some parameters, such as test mass loss, relative dynamic elastic modulus and compressive strength loss and so on, were studied with the number of freeze-thaw cycles.Combined with damage mechanics, taking ultrasonic wave velocity as damage variable, the relationship between freeze-thaw damage and load coupling action were analyzed. The freeze-thaw damage prediction model was established according to the Weibull and the evolution equation of freeze-thaw damage and compressive strength was obtained. The results show that, with the increase of the number of freeze-thaw cycles, the freeze-thaw damage of fiber concrete is reduced under the coupling of stress level of 0.3, and the freeze-thaw damage of fiber concrete is further aggravated under stress level of 0.5. The damage prediction model has high feasibility and it accurately predicts the different damage after freeze-thaw cycles. The evolution equation derived has better correlation, and it flexibly realizes the transformation between freeze-thaw damage and compressive strength.

Key words: fiber concrete, freeze-thaw cycle, coupling effect, damage property, continuous loading, prediction model

中图分类号:

TU528

孙杰, 冯川, 吴爽, 马稳, 孙明星. 持续荷载与冻融循环耦合作用下纤维混凝土损伤性能研究[J]. 硅酸盐通报, 2022, 41(8): 2728-2738.

SUN Jie, FENG Chuan, WU Shuang, MA Wen, SUN Mingxing. Damage Properties of Fiber Concrete under Coupling Effect of Continuous Loading and Freeze-Thaw Cycles[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2022, 41(8): 2728-2738.

参考文献

[1] 武海荣,金伟良,延永东,等.混凝土冻融环境区划与抗冻性寿命预测[J].浙江大学学报(工学版),2012,46(4):650-657.
WU H R, JIN W L, YAN Y D, et al. Environmental zonation and life prediction of concrete in frost environments[J]. Journal of Zhejiang University (Engineering Science), 2012, 46(4): 650-657 (in Chinese).
[2] 谢剑,崔宁,姜晓峰.混凝土超低温冻融循环损伤机理及控制措施[J].硅酸盐通报,2018,37(8):2367-2371+2377.
XIE J, CUI N, JIANG X F. Mechanism and improvement of freeze-thaw deterioration of concrete under ultra-low temperature[J]. Bulletin of the Chinese Ceramic Society, 2018, 37(8): 2367-2371+2377 (in Chinese).
[3] WANG R J, HU Z Y, LI Y, et al. Review on the deterioration and approaches to enhance the durability of concrete in the freeze-thaw environment[J]. Construction and Building Materials, 2022, 321: 126371.
[4] 何晓雁,张天晓,王辰昊,等.纤维水泥基材料抗冻性与孔结构关系的变化规律[J].硅酸盐通报,2022,41(5):1529-1538.
HE X Y, ZHANG T X, WANG C H, et al. Variation of relationship between frost resistance and pore structure of fiber cement-based material[J]. Bulletin of the Chinese Ceramic Society, 2022, 41(5): 1529-1538 (in Chinese).
[5] 姚武.聚丙烯腈纤维混凝土的低温性能[J].同济大学学报(自然科学版),2004,32(5):627-631.
YAO W. Properties of polyacrylonitrile fiber reinforced concrete at low temperatures[J]. Journal of Tongji University (Nature Science Edition), 2004, 32(5): 627-631 (in Chinese).
[6] ZENG Y S, ZHOU X Y, TANG A P. Shear performance of fibers-reinforced lightweight aggregate concrete produced with industrial waste ceramsite-Lytag after freeze-thaw action[J]. Journal of Cleaner Production, 2021, 328: 129626.
[7] 牛荻涛,姜磊,白敏.钢纤维混凝土抗冻性能试验研究[J].土木建筑与环境工程,2012,34(4):80-84+98.
NIU D T, JIANG L, BAI M. Experimental analysis on the frost resistance of steel fiber reinforced concrete[J]. Journal of Civil, Architectural & Environmental Engineering, 2012, 34(4): 80-84+98 (in Chinese).
[8] 熊小斌,王瑞骏,李阳,等.单掺和混掺纤维面板混凝土抗盐冻耐久性试验研究[J].水资源与水工程学报,2021,32(3):173-178.
XIONG X B, WANG R J, LI Y, et al. Experimental study on salt-freezing durability of single and mixed fiber-doped panel concrete[J]. Journal of Water Resources and Water Engineering, 2021, 32(3): 173-178 (in Chinese).
[9] 王志伟,马福.硫酸盐侵蚀与冻融耦合作用下混凝土损伤研究[J].新型建筑材料,2017,44(11):40-43.
WANG Z W, MA F. Study on the damage of concrete under the couple action of sulfate corrosion and freeze-thaw[J]. New Building Materials, 2017, 44(11): 40-43 (in Chinese).
[10] 王发洲,黄大凡,杨进,等.干湿循环对混凝土单面盐冻破坏的影响[J].武汉理工大学学报,2016,38(4):8-13.
WANG F Z, HUANG D F, YANG J, et al. The effect of dry-wet circulation on one-sided salt frost damage of concrete[J]. Journal of Wuhan University of Technology, 2016, 38(4): 8-13 (in Chinese).
[11] CHEN D S, DENG Y A, SHEN J Y, et al. Study on damage rules on concrete under corrosion of freeze-thaw and saline solution[J]. Construction and Building Materials, 2021, 304: 124617.
[12] 刘佳奇,王伯昕,汪飞.碳酸盐侵蚀-冻融循环条件下混凝土抗压性能试验研究[J].混凝土,2021(11):21-23+28.
LIU J Q, WANG B X, WANG F. Experimental study on the compressive property of concrete under CO^2-₃ attacks and freeze-thaw cycles[J]. Concrete, 2021(11): 21-23+28 (in Chinese).
[13] LI G F, SHEN X D. A study of the durability of aeolian sand powder concrete under the coupling effects of freeze-thaw and dry-wet conditions[J]. JOM, 2019, 71(6): 1962-1974.
[14] 苏有彪,胡大琳,张航,等.碳化-冻融作用下钢筋混凝土梁承载力衰减分析[J].硅酸盐通报,2019,38(4):948-956.
SU Y B, HU D L, ZHANG H, et al. Analysis on load capacity attenuation of reinforced concrete beam after carbonization and freeze-thaw action[J]. Bulletin of the Chinese Ceramic Society, 2019, 38(4): 948-956 (in Chinese).
[15] 郭寅川,申爱琴,何天钦,等.疲劳荷载和冻融循环耦合作用下路面混凝土微裂缝扩展行为[J].交通运输工程学报,2016,16(5):1-9.
GUO Y C, SHEN A Q, HE T Q, et al. Micro-crack propagation behavior of pavement concrete subjected to coupling effect of fatigue load and freezing-thawing cycles[J]. Journal of Traffic and Transportation Engineering, 2016, 16(5): 1-9 (in Chinese).
[16] SUN W, ZHANG Y M, YAN H D, et al. Damage and damage resistance of high strength concrete under the action of load and freeze-thaw cycles[J]. Cement and Concrete Research, 1999, 29(9): 1519-1523.
[17] 刘建忠,孙伟,缪昌文,等.弯曲荷载与盐溶液复合作用下混凝土冻融损伤[J].东南大学学报(自然科学版),2006,36(s2):243-247.
LIU J Z, SUN W, MIAO C W, et al. Freeze-thaw damage of concrete under flexural load and salt solution[J]. Journal of Southeast University (Natural Science Edition), 2006, 36(s2): 243-247 (in Chinese).
[18] 郭丽萍,张文潇,孙伟,等.隧道用纤维素纤维混凝土在弯拉荷载作用下的耐久性[J].东南大学学报(自然科学版),2016,46(3):612-618.
GUO L P, ZHANG W X, SUN W, et al. Durability of cellulose fiber reinforced concrete under bending load in tunnel engineering[J]. Journal of Southeast University (Natural Science Edition), 2016, 46(3): 612-618 (in Chinese).
[19] 宁喜亮,王万平,郝帅,等.不同纤维对混凝土在多重因素作用下抗冻耐久性的影响[J].工业建筑,2020,50(10):122-128.
NING X L, WANG W P, HAO S, et al. Effect of different fibers on frost resistance of concrete under multiple factors[J]. Industrial Construction, 2020, 50(10): 122-128 (in Chinese).
[20] YUAN Y, ZHAO R D, LI R, et al. Frost resistance of fiber-reinforced blended slag and Class F fly ash-based geopolymer concrete under the coupling effect of freeze-thaw cycling and axial compressive loading[J]. Construction and Building Materials, 2020, 250: 118831.
[21] JIN S S, ZHENG G P, YU J. A micro freeze-thaw damage model of concrete with fractal dimension[J]. Construction and Building Materials, 2020, 257: 119434.
[22] WANG B X, WANG F, WANG Q. Damage constitutive models of concrete under the coupling action of freeze-thaw cycles and load based on Lemaitre assumption[J]. Construction and Building Materials, 2018, 173: 332-341.
[23] 雷斌,李召行,邹俊,等.荷载与腐蚀冻融耦合作用下再生混凝土耐久性能试验[J].农业工程学报,2018,34(20):169-174.
LEI B, LI Z H, ZOU J, et al. Experiment on durability of recycled concrete under coupling multi-factors of load and corrosion freeze-thaw[J]. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(20): 169-174 (in Chinese).
[24] 乔运峰.不同饱水度砼在冻融与疲劳耦合作用下的损伤劣化与寿命预测[D].南京:东南大学,2018:4-5.
QIAO Y F. Damage degradation and life prediction of different saturation concrete subjected to coupling fatigue load and freeze/thaw cycles[D]. Nanjing: Southeast University, 2018: 4-5 (in Chinese).
[25] WANG C Q, PANG W J, MA Z M, et al. Investigation on mechanical behaviors of a new sustainable composite material for fiber-reinforced recycled aggregate concrete under compressive low-cycle loadings[J]. Construction and Building Materials, 2022, 326: 126916.
[26] LOEFFLER C, SUN Q R, HEARD W, et al. The effect of loading duration on damage initiation in high-strength concrete[J]. Mechanics of Materials, 2020, 140: 103216.
[27] LI F P, CHEN D F, LU Y Y, et al. Influence of mixed fibers on fly ash based geopolymer resistance against freeze-thaw cycles[J]. Journal of Non-Crystalline Solids, 2022, 584: 121517.
[28] 张广泰,刘诗拓,耿天娇,等.基于Weibull分布的冻融循环下纤维混凝土损伤模型[J].科学技术与工程,2020,20(29):12078-12084.
ZHANG G T, LIU S T, GENG T J, et al. On damage model of fiber concrete based on the weibull distribution in freezing-thawing cycle[J]. Science Technology and Engineering, 2020, 20(29): 12078-12084 (in Chinese).
[29] 贾祥.韦布尔分布及其可靠性统计方法[M].北京:科学出版社,2021:1-5.
JIA X. Weibull distribution and its reliability statistical method[M]. Beijing: Science Press, 2021: 1-5 (in Chinese).
[30] 李刊,魏智强,乔宏霞,等.耦合盐溶液环境下钢筋/混凝土Weibull耐久性寿命预测方法[J].复合材料学报,2021,38(7):2370-2382.
LI K, WEI Z Q, QIAO H X, et al. Weibull durability life prediction method of reinforced concrete in environment of coupled salt solution[J]. Acta Materiae Compositae Sinica, 2021, 38(7): 2370-2382 (in Chinese).
[31] 路承功,魏智强,乔宏霞,等.基于3参数Weibull分布钢筋混凝土盐腐蚀环境中可靠性寿命分析[J].工程科学学报,2021,43(4):512-520.
LU C G, WEI Z Q, QIAO H X, et al. Reliability life analysis of reinforced concrete in a salt corrosion environment based on a three-parameter Weibull distribution[J]. Chinese Journal of Engineering, 2021, 43(4): 512-520 (in Chinese).