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【目的】针对我国北方地区堆石坝面板的实际服役环境，冻融条件下碳化耐久性失效是导致寒冷地区面板混凝土耐久性劣化的主要问题。为探究冻融循环对面板混凝土碳化耐久性的影响规律及机理，【方法】采用快速冻融试验、加速碳化试验、扫描电镜及核磁共振分析技术，对混凝土试件进行0次、50次、100次、150次、200次冻融循环，再加速碳化0 d、7 d、14 d、28 d。通过对混凝土碳化深度、相对动弹性模量、超声波波速、劈裂抗拉强度、抗压强度等宏观指标及孔隙率、孔径分布等微观指标的测试，分析了冻融循环和碳化作用对混凝土微细观孔隙结构及耐久性的影响规律。【结果】结果表明：冻融损伤条件下，碳化作用后混凝土的碳化深度大于单独碳化作用下的碳化深度；碳化作用提高了面板混凝土的相对动弹性模量、超声波波速、劈裂抗拉强度及抗压强度。冻融循环200次后，碳化28 d的最可几孔径由59.35 nm减小为41.94 nm,降低了29.33%。【结论】冻融循环对混凝土造成的损伤，降低了混凝土的抗碳化能力；碳化反应降低了面板混凝土的孔隙率及最可几孔径，缓解了冻融循环对混凝土造成的损伤。控制混凝土内孔径d>1 000 nm孔径范围孔含量，增加10 nm≤d<100 nm范围内孔的含量，可以提高冻融条件下面板混凝土的抗碳化耐久性。
Abstract：[Objective]According to the actual service environment of the face slab of rockfill dam in northern China, the failure of carbonation durability under freeze-thaw conditions is the main problem leading to the deterioration of the durability of face slab concrete in cold areas. In order to explore the influence law and mechanism of freeze-thaw cycles on carbonation durability of face slab concrete, [Methods]the rapid freeze-thaw test, accelerated carbonation test, scanning electron microscope and nuclear magnetic resonance analysis technology were used to conduct freeze-thaw cycles on concrete specimens for 0, 50, 100, 150 and 200 times, and then accelerate carbonation for 0, 7, 14 and 28 days. By testing the macro indexes of concrete such as carbonation depth, relative dynamic elastic modulus, ultrasonic wave velocity, splitting tensile strength and compressive strength, and micro indexes such as porosity and pore size distribution, the influence of freeze-thaw cycle and carbonation on the micro-pore structure and durability of concrete is analyzed.[Results]The results show that the carbonation depth of concrete after carbonation is greater than that under the condition of freeze-thaw damage. Carbonization improves the relative dynamic elastic modulus, ultrasonic wave velocity, splitting tensile strength and compressive strength of concrete face slab. After 200 freeze-thaw cycles, the most probable pore size of carbonization for 28 days decreased from 59.35 nm to 41.94 nm, a decrease of 29.33%.[Conclusion]The damage caused by freeze-thaw cycle to concrete reduces the carbonation resistance of concrete; Carbonization reaction reduces the porosity and the most probable pore size of face slab concrete, and alleviates the damage to concrete caused by freeze-thaw cycle. Controlling the pore content in the range of concrete internal pore diameter d>1 000 nm and increasing the pore content in the range of 10 nm≤d<100 nm can improve the carbonation resistance of face slab concrete under freezing and thawing conditions.
[1] 杨泽艳，周建平，王富强，等.中国混凝土面板堆石坝发展30年[J].水电与抽水蓄能，2017,3(1):1-5.YANG Zeyan,ZHOU Jianping,WANG Fuqiang,et al.30 years’ development of concrete face rockfill dam in China[J].Hydropower and pumped storage,2017,3(1):1-5.
[2] 杨先文.单组份聚脲涂料在上游坝面防渗中的应用研究[J].水利科学与寒区工程，2023,6(7):150-152.YANG Xianwen.Application research of single component polyurea coating in upstream dam seepage prevention[J].Hydro Science and Cold Zone Engineering,2023,6(7):150-152.
[3] 刘兆正，张合朋，吉庆伟，等.冻融环境下水工混凝土结构碳化时变可靠度分析[J].江苏水利，2021(6):17-22.LIU Zhaozheng,ZHANG Hepeng,JI Qingwei,et al.Time-varying reliability analysis of carbonation of hydraulic concrete structures in freeze-thaw environment[J].Jiangsu Water Conservancy,2021(6):17-22.
[4] 王明刚.重大水工混凝土结构隐患检测与健康诊断研究[J].城市道桥与防洪，2019(8):242-244.WANG Minggang.Study on detection and health diagnosis of hidden dangers of major hydraulic concrete structures [J].Urban roads and bridges and flood control,2019(8):242-244.
[5] 张城芋，陈四利，江双双，等.干湿与冻融耦合作用下稻壳灰水泥土疲劳特性[J].排灌机械工程学报，2023,41(6):562-567.ZHANG Chengyu,CHEN Sili,JIANG Shuangshuang,et al.Fatigue characteristics of rice husk ash cement-soil under coupled action of dry-wet and freeze-thaw[J].Journal of Drainage and Irrigation Machinery Engineering,2023,41(6):562-567.
[6] 肖前慧，牛荻涛.冻融和碳化共同作用下混凝土损伤分析[J].建筑材料学报，2015,18(5):763-766.XIAO Qianhui,NIU Yitao.Damage analysis of concrete under the combined action of freeze-thaw and carbonation [J].Journal of Building Materials,2015,18(5):763-766.
[7] 王建刚，张金喜，党海笑，等.碳化、干湿与冻融耦合作用下再生混凝土耐久性能[J].北京工业大学学报，2021,47(6):616-624.WANG Jiangang,ZHANG Jinxi,DANG Haixiao,et al.Durability of recycled concrete under carbonation,dry-wet and freeze-thaw coupling [J].Journal of Beijing University of Technology,2021,47(6):9.
[8] 王振波，周潮，王家赫，等.高延性水泥基材料(ECC)开裂后渗透性研究综述[J].水利发展研究，2024,24(6):59-64.WANG Zhenbo,ZHOU Chao,WANG Jiahe,et al.Summary of research on the permeability of Engineered Cementitious Composites(ECC) after cracking[J].Water Resources Development Research,2024,24(6):59-64.
[9] 徐文胜，吴贤国，冯宗宝，等.复杂环境多因素耦合作用下混凝土耐久性能劣化分析[J].现代隧道技术，2022,59(6):239-249.XU Wensheng,WU Xianguo,FENG Zongbao,et al.Analysis on the deterioration of durability of concrete under the coupling effect of multiple factors in complex environment[J].Modern Tunnel Technology,2022,59(6):239-249.
[10] ZHANG W,PI Y,KONG W,et al.Influence of damage degree on the degradation of concrete under freezing-thawing cycles[J].Construction and Building Materials,2020,260:119903.
[11] ZHAO R,SHI C,ZHANG R,et al.Study on the freeze-thaw resistance of concrete pavements in seasonally frozen regions[J].Materials,2024,17(8),1902.
[12] 翟海涛.冻融作用对粉煤灰混凝土碳化性能影响规律研究[D].包头：内蒙古科技大学，2012.ZHAI Haitao.Study on the Influence of Freezing and Thawing on Carbonation Performance of Fly Ash Concrete [D].Baotou:Inner Mongolia University of Science and Technology,2012.
[13] 冉晋，张金喜，杨米加，等.碳化与冻融交替作用下的混凝土抗压强度[J].建筑材料学报，2017,20(4):517-521.RAN Jin,ZHANG Jinxi,YANG Mijia,et al.Compressive strength of concrete under alternating carbonation and freeze-thaw[J].Journal of building materials,2017,20(4):517-521.
[14] 郑昊，曹国辉，张再华，等.彩色陶粒混凝土冻融循环试验研究[J].湖南城市学院学报(自然科学版),2024,33(5):1-4.ZHENG Hao,CAO Guohui,ZHANG Zaihua,et al.Experimental study on freeze-thaw cycle of colored ceramsite concrete [J].Journal of Hunan City University (Natural Science Edition),2024,33(5):1-4.
[15] 苏怀智，谢威.寒区水工混凝土冻融损伤及其防控研究进展[J].硅酸盐通报，2021,40(4):1053-1071.SU Huaizhi,XIE Wei.Research progress on freeze-thaw damage of hydraulic concrete in cold regions and its prevention and control [J].Silicate Bulletin,2021,40(4):1053-1071.
[16] ZHANG S,TAN G,QI Z,et al.Relationship between the carbonation depth and microstructure of concrete under freeze-thaw conditions[J].Materials,2024,17(24):6191.
[17] WANG X,YANG Q,PENG X,et al.A review of concrete carbonation depth evaluation models[J].Coatings,2024,14(4):386.
[18] 穆柏林.寒冷地区碳化与冻融对混凝土桥梁耐久性影响试验研究[D].张家口：河北建筑工程学院，2018.MU Bailin.Experimental Study on the Influence of Carbonation and Freeze-thaw on the Durability of Concrete Bridges in Cold Regions [D].Zhangjiakou:Hebei Institute of Civil Engineering and Architecture,2018.
[19] 陈超，刘永昌.硫酸盐干湿循环下不同因素对水工混凝土耐久性能的影响研究[J].水利科学与寒区工程，2024,7(12):47-50.CHEN Chao,LIU Yongchang.Study on the influence of different factors on the durability of hydraulic concrete under sulfate dry-wet cycle [J].Hydraulic Science and Cold Region Engineering,2024,7(12):47-50.
[20] 牛建刚.一般大气环境多因素作用混凝土中性化性能研究[D].西安：西安建筑科技大学，2008.NIU Jiangang.Study on Neutralization Performance of Concrete under Multi-factor Action of General Atmospheric Environment [D].Xi’an:Xi’an University of Architecture and Technology,2008.
[21] ZHANG S,TIAN B,CHEN B,et al.The influence of freeze-thaw cycles and corrosion on reinforced concrete and the relationship between the evolutions of the microstructure and mechanical properties[J].Materials,2022,15(18):6215.
[22] ZHANG S,CHEN B,TIAN B,et al.Effect of fly ash content on the microstructure and strength of concrete under freeze-thaw condition[J].Buildings,2022,12(12):2113.
[23] WANG R,ZhANG Q,LI Y.Deterioration of concrete under the coupling effects of freeze-thaw cycles and other actions:A review[J].Construction and Building Materials,2022,319:126045.
[24] 肖前慧.冻融环境多因素耦合作用混凝土结构耐久性研究[D].西安：西安建筑科技大学，2010.XIAO Qianhui.Study on Durability of Concrete Structure Under Multi-Factor Coupling Action in Freeze-thaw Environment [D].Xi’an:Xi’an University of Architecture and Technology,2010.
[25] 燕坤，余红发，麻海燕，等.氯盐与弯曲荷载对碳化混凝土的抗冻性的影响[J].武汉理工大学学报，2010,32(6):20-22.YAN Kun,YU Hongfa,MA Haiyan,et al.Effect of chloride salt and bending load on frost resistance of carbonated concrete [J].Journal of Wuhan University of Technology,2010,32(6):20-22.
[26] 张鑫.碳化和冻融耦合作用下混凝土性能试验研究[D].扬州：扬州大学，2020.ZHANG Xin.Experimental Study on Concrete Performance under Carbonation and Freeze-thaw Coupling [D].Yangzhou:Yangzhou University,2020.
[27] 张鹏，赵铁军，金祖权.冻融对混凝土碳化的影响[J].四川建筑科学研究，2008(1):66-68.ZHANG Peng,ZHAO Tiejun,JIN Zuquan.Effect of freeze-thaw on concrete carbonation [J].Sichuan Building Science Research,2008(1):66-68.
[28] 张鹏，赵铁军，杨进波，等.冻融前后混凝土碳化性能试验研究[J].混凝土，2007(5):6-8.ZHANG Peng,ZHAO Tiejun,YANG Jinbo,et al.Experimental study on carbonation performance of concrete before and after freeze-thaw[J].Concrete,2007(5):6-8.
[29] 范志勇，刘威，梁慧.高寒地区水电站水工混凝土耐久性研究[J].四川水力发电，2020,39(4):13-18.FAN Zhiyong,LIU Wei,LIANG Hui.Study on the durability of hydraulic concrete for hydropower stations in alpine regions [J].Sichuan Hydropower,2020,39(4):13-18.
[30] 郭鹏高.多种不利因素作用下的水工混凝土老化机理研究[J].黑龙江水利科技，2022,50(3):24-29.GUO Penggao.Study on the aging mechanism of hydraulic concrete under various unfavorable factors [J].Heilongjiang Hydraulic Science and Technology,2022,50(3):24-29.
[31] 赵晋，严江.C25F50W8混凝土面板配合比设计研究[J].陕西水利，2020(1):12-15.ZHAO Jin,YAN Jiang.Study on mix design of C25F50W8 concrete face slab [J].Shaanxi Water Resources,2020(1):12-15.
[32] 张小刚，李明付，田斌，等.持续荷载对面板混凝土冻融性能和孔结构影响[J].三峡大学学报(自然科学版),2024,46(6):18-24.ZHANG Xiaogang,LI Mingfu,TIAN Bin,et al.Effect of continuous load on freeze-thaw performance and pore structure of concrete face slab [J].Journal of China Three Gorges University (Natural Science Edition),2024,46(6):18-24.
[33] 易永军，赵继成.面板混凝土配合比设计探讨[J].水利技术监督，2012,20(3):24-27.YI Yongjun,ZHAO Jicheng.Discussion on mix design of concrete face slab [J].Water Conservancy Technical Supervision,2012,20(3):24-27.
[34] 宫经伟，李双喜，葛毅雄，等.混凝土面板堆石坝面板混凝土配合比优化设计[J].粉煤灰综合利用，2015(3):36-41.GONG Jingwei,LI Shuangxi,GE Yixiong,et al.Optimization design of concrete mix proportion of concrete face rockfill dam [J].Comprehensive Utilization of Fly Ash,2015(3):36-41.
[35] 水利水电规划设计总院.混凝土面板堆石坝设计规范：NB/T 10871—2021 [S].北京：中国水利水电出版社，2021.General Institute of Water Resources and Hydropower Planning and Design.Code for Design of Concrete Face Rockfill Dam:NB/T10871—2021[S].Beijing:China Water Resources and Hydropower Press,2021.
[36] 中华人民共和国水利部.水工混凝土试验规程：SL/T 352—2020[S].北京：中国水利水电出版社，2021.Ministry of Water Resources of People’s Republic of China.Test Specification for Hydraulic Concrete:SL/T 352—2020[S].Beijing:China Water Resources and Hydropower Press,2021.
[37] 刘伟，邹春霞，薛慧君，等.渠道衬砌混凝土冻融风蚀耐久性能及寿命预测[J].排灌机械工程学报，2023,41(6):568-575.LIU Wei,ZOU Chunxia,XUE Huijun,et al.Durability and life prediction of freeze-thaw-wind erosion of channel lining concrete[J].Journal of Drainage and Irrigation Machinery Engineering,2023,41(6):568-575.
[38] 李阳.复合侵蚀作用下再生混凝土耐久性的劣化机理研究[D].西安：西安理工大学，2018.LI Yang.Study on the Deterioration Mechanism of Durability of Recycled Concrete under Combined Erosion [D].Xi’an:Xi’an University of Technology,2018.
[39] KUOSA H,FERREIRA R M,HOLT E,et al.Effect of coupled deterioration by freeze-thaw,carbonation and chlorides on concrete service life[J].Cement & Concrete Composites,2014,47:32-40.
[40] LI Y,WANG R,LI S,et al.Resistance of recycled aggregate concrete containing low-and high-volume fly ash against the combined action of freeze-thaw cycles and sulfate attack[J].Construction and Building Materials,2018,166:23-34.
[41] YANG Q,LIU M,LI J,et al.Study on the degradation models based on the experiments considering the coupling effect of freeze-thaw and carbonation[J].Structures,2024,64:106659.
基本信息:
DOI：10.13928/j.cnki.wrahe.2025.11.019
中图分类号:TV431
引用信息:
[1]张书华,祁志强,谭光荣,等.冻融循环和碳化作用下面板混凝土的耐久性研究[J].水利水电技术(中英文),2025,56(11):243-254.DOI:10.13928/j.cnki.wrahe.2025.11.019.
基金信息:
国家自然科学基金项目(51879145); 湖北省地质局第七地质大队科研项目(DQKJ2023-10)