青藏高原地区纤维混凝土抗冻耐久性试验与损伤模型研究

摘要/Abstract

摘要： 为研究青藏高原环境条件下不同纤维混凝土的抗冻耐久性及冻融损伤演化规律,本研究依托西藏那曲地区某混凝土道路工程,对普通纤维混凝土(NC)、冲磨纤维混凝土(CM)以及膨胀纤维混凝土(PZ)进行了冻融循环试验和相关力学测试,在试验研究的基础上,提出了适用于高原低气压环境下的冻融损伤模型。研究结果表明,从冻融循环试验结果来看,冲磨纤维混凝土(CM)抗冻耐久性最佳,三种纤维混凝土抗冻耐久性排序为CM＞NC＞PZ。针对本文建立的冻融损伤模型和基于该模型的抗折强度预测方程,采用青藏高原地区某高速工程项目的高寒引气混凝土测试数据进行了验证,冻融后的抗折强度试验值与预测值变化趋势相近且基本吻合。因此,本文建立的青藏高原抗折强度冻融损伤模型是合理且可行的。

关键词: 青藏高原地区, 外加剂, 纤维混凝土, 现场试验, 抗冻耐久性, 损伤模型

Abstract: In order to investigate the frost resistance durability and evolution law of freeze-thaw damage on different fiber concrete under environmental conditions of the Tibet Plateau area, this paper relies on a concrete road project in the Naqu area of Tibet, the freeze-thaw cycle test and related mechanical tests were conducted on ordinary fiber concrete (NC), abrasion fiber concrete (CM) and expansive fiber concrete (PZ). On the basis of the experimental study, a freeze-thaw damage model was established under low pressure environment of the plateau. The results show that abrasion fiber concrete (CM) has the best frost resistance durability based on the results of freeze-thaw cycle test, while the three kinds of fiber concrete are ranked as CM>NC>PZ in terms of frost resistance durability. According to the freeze-thaw damage model and the predicted flexural strength equation based on the model which are established in this paper, the test data of high cold air-entraining concrete from a high-speed project in the Tibet Plateau area are used for verification. It is found that the trend of the test values of flexural strength after freeze-thaw cycles are similar and coincided with the predicted values. Therefore, the freeze-thaw damage model for the flexural strength of the Tibet Plateau which is established in this paper can be probably reasonable and feasible.

Key words: Tibet Plateau area, admixture, fiber concrete, field test, frost resistance durability, damage model

中图分类号:

TU528

邓祥辉, 张鹏, 王睿, 吴起源, 王旭. 青藏高原地区纤维混凝土抗冻耐久性试验与损伤模型研究[J]. 硅酸盐通报, 2023, 42(9): 3143-3153.

DENG Xianghui, ZHANG Peng, WANG Rui, WU Qiyuan, WANG Xu. Frost Resistance Durability and Damage Model of Fiber Concrete in Tibet Plateau Area[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2023, 42(9): 3143-3153.

参考文献

[1] 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.
[2] 武海荣, 金伟良, 张锋剑, 等. 关注环境作用的混凝土冻融损伤特性研究进展[J]. 土木工程学报, 2018, 51(8): 37-46.
WU H R, JIN W L, ZHANG F J, et al. A state-of-the-art review on freeze-thaw damage characteristics of concrete under environmental actions[J]. China Civil Engineering Journal, 2018, 51(8): 37-46 (in Chinese).
[3] 郑元勋, 杨培冰, 康海贵. 冻融环境下混凝土结构耐久性研究综述[J]. 郑州大学学报(工学版), 2016, 37(5): 27-32.
ZHENG Y X, YANG P B, KANG H G. The overview of concrete structure durability under the freeze-thaw condition[J]. Journal of Zhengzhou University (Engineering Science), 2016, 37(5): 27-32 (in Chinese).
[4] 张一奔, 徐飞, 郑山锁. 冻融损伤混凝土研究综述[J]. 混凝土, 2021(3): 10-14.
ZHANG Y B, XU F, ZHENG S S. Review of research on freeze-thaw damage concrete[J]. Concrete, 2021(3): 10-14 (in Chinese).
[5] 李金玉, 曹建国, 徐文雨, 等. 混凝土冻融破坏机理的研究[J]. 水利学报, 1999, 30(1): 41-49.
LI J Y, CAO J G, XU W Y, et al. Stydy on the mechanism of concrete destruction under frost action[J]. Journal of Hydraulic Engineering, 1999, 30(1): 41-49 (in Chinese).
[6] DENG X H, GAO X Y, WANG R, et al. Investigation of microstructural damage in air-entrained recycled concrete under a freeze-thaw environment[J]. Construction and Building Materials, 2021, 268: 121219.
[7] RUSTAMOV S, KIM S W, KWON M, et al. Mechanical behavior of fiber-reinforced lightweight concrete subjected to repeated freezing and thawing[J]. Construction and Building Materials, 2021, 273: 121710.
[8] 程红强, 高丹盈. 聚丙烯纤维混凝土冻融损伤试验研究[J]. 东南大学学报(自然科学版), 2010, 40(增刊2): 197-200.
CHENG H Q, GAO D Y. Experimental study on damage of polypropylene fiber concrete in freeze-thaw cycles[J]. Journal of Southeast University (Natural Science Edition), 2010, 40(supplement 2): 197-200 (in Chinese).
[9] 刘崇熙, 汪在芹. 坝工混凝土耐久寿命的衰变规律[J]. 长江科学院院报, 2000, 17(2): 18-21.
LIU C X, WANG Z Q. On decay rules of durable life of dam concrete[J]. Journal of Yangtze River Scientific Research Institute, 2000, 17(2): 18-21 (in Chinese).
[10] 乔宏霞, 李江川, 朱飞飞, 等. 纤维混凝土抗冻性能研究[J]. 功能材料, 2019, 50(1): 1114-1119.
QIAO H X, LI J C, ZHU F F, et al. Study on frost resistance of fiber reinforced concrete[J]. Journal of Functional Materials, 2019, 50(1): 1114-1119 (in Chinese).
[11] 赵小明, 李奥阳, 乔宏霞, 等. 纤维混凝土抗冻性能及损伤劣化模型研究[J]. 硅酸盐通报, 2020, 39(10): 3196-3202.
ZHAO X M, LI A Y, QIAO H X, et al. Frost resistance and damage deterioration model of fiber reinforced concrete[J]. Bulletin of the Chinese Ceramic Society, 2020, 39(10): 3196-3202 (in Chinese).
[12] 周志东, 刘春文, 王位. 西藏高寒地区混凝土的耐久性问题及对策[J]. 水利水电技术, 2013, 44(3): 82-86.
ZHOU Z D, LIU C W, WANG W. Durability problem of concrete in alpine region of Tibet and its countermeasures[J]. Water Resources and Hydropower Engineering, 2013, 44(3): 82-86 (in Chinese).
[13] 米永刚, 刘云贺. 高寒地区高性能混凝土配合比设计与耐久性研究[J]. 混凝土, 2020(7): 92-95.
MI Y G, LIU Y H. Research on mix design and durability of high performance concrete in alpine region[J]. Concrete, 2020(7): 92-95 (in Chinese).
[14] 刘旭, 陈歆, 田波, 等. 低气压环境下水泥混凝土性能研究进展[J]. 硅酸盐学报, 2021, 49(8): 1743-1752.
LIU X, CHEN X, TIAN B, et al. Cement concrete properties under low atmospheric pressures: a short review[J]. Journal of the Chinese Ceramic Society, 2021, 49(8): 1743-1752 (in Chinese).
[15] 李雪峰, 付智, 王华牢. 青藏高原地区混凝土冻融环境量化方法[J]. 农业工程学报, 2018, 34(2): 169-175.
LI X F, FU Z, WANG H L. Quantitative method for freezing-thawing environment of concrete in Qinghai-Tibet Plateau[J]. Transactions of the Chinese Society of Agricultural Engineering, 2018, 34(2): 169-175 (in Chinese).
[16] GE X, GE Y, LI Q F, et al. Effect of low air pressure on the durability of concrete[J]. Construction and Building Materials, 2018, 187: 830-838.
[17] GE X, GE Y, DU Y B, et al. Effect of low air pressure on mechanical properties and shrinkage of concrete[J]. Magazine of Concrete Research, 2018, 70(18): 919-927.
[18] 中华人民共和国住房和城乡建设部. 普通混凝土长期性能和耐久性能试验方法标准: GB/T 50082—2009[S]. 北京: 中国建筑工业出版社, 2009.
Ministry of Housing and Urban-Rural Development, People's Republic of China. Standard of test method for long-term performance and durability of ordinary concrete: GB/T 50082—2009[S]. Beijing: China Architecture and Construction Press, 2009 (in Chinese).
[19] 李雪峰, 付智. 低气压环境对混凝土含气量及气泡稳定性的影响[J]. 硅酸盐学报, 2015, 43(8): 1076-1082.
LI X F, FU Z. Effect of low-pressure of environment on air content and bubble stability of concrete[J]. Journal of the Chinese Ceramic Society, 2015, 43(8): 1076-1082 (in Chinese).
[20] 李立辉, 陈歆, 田波, 等. 大气压强对混凝土引气剂引气效果的影响[J]. 建筑材料学报, 2021, 24(4): 866-873.
LI L H, CHEN X, TIAN B, et al. Effect of atmospheric pressure on air-entraining performance of air-entraining agent of concrete[J]. Journal of Building Materials, 2021, 24(4): 866-873 (in Chinese).
[21] 李雪峰, 付智, 罗翥, 等. 高原低气压环境对新拌混凝土含气量的影响[J]. 东南大学学报(自然科学版), 2014, 44(5): 1046-1051.
LI X F, FU Z, LUO Z, et al. Effect of low-pressure in plateau environment on air content of fresh concrete[J]. Journal of Southeast University (Natural Science Edition), 2014, 44(5): 1046-1051 (in Chinese).
[22] 杨哲. 高原低气压环境下混凝土气孔结构调控及耐久性研究[D]. 西安: 长安大学, 2022.
YANG Z. Air pore structure regulation and durability of concrete under low air pressure on plateau[D]. Xi'an: Chang'an University, 2022 (in Chinese).
[23] 何锐, 王铜, 陈华鑫, 等. 青藏高原气候环境对混凝土强度和抗渗性的影响[J]. 中国公路学报, 2020, 33(7): 29-41.
HE R, WANG T, CHEN H X, et al. Impact of qinghai-tibet plateau's climate on strength and permeability of concrete[J]. China Journal of Highway and Transport, 2020, 33(7): 29-41 (in Chinese).
[24] 李扬, 王振地, 薛成, 等. 高原低气压对道路工程混凝土性能的影响及原因[J]. 中国公路学报, 2021, 34(9): 194-202.
LI Y, WANG Z D, XUE C, et al. Influence of low air pressure on the performance of concrete in road engineering[J]. China Journal of Highway and Transport, 2021, 34(9): 194-202 (in Chinese).
[25] 邓祥辉, 王睿, 刘怡媛. 高海拔寒冷地区混凝土箱梁抗冻耐久性及施工关键技术研究[D]. 西安: 西安工业大学, 2021.
DENG X H, WANG R, LIU Y Y. Research on frost resistance durability and key construction technology of concrete box girder in high altitude cold region[D]. Xi'an: Xi'an Technology University, 2021 (in Chinese).