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工程科学与技术:2022,54(4):1-11
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川藏铁路石灰石粉–水泥基材料抗低温硫酸盐侵蚀研究
(1.兰州交通大学 土木工程学院,甘肃 兰州 730070;2.中铁十四局集团有限公司,山东 济南 250014;3.西南交通大学 土木工程学院,四川 成都 610031;4.中国国家铁路集团有限公司 工程管理中心,北京 100844)
Sulfate Attack of Limestone Powder–Cement Based Materials Under Low Temperature of the Sichuan-Tibet Railway
(1.School of Civil Eng., Lanzhou Jiaotong Univ., Lanzhou 730070, China;2.China Railway 14th Bureau Group Co., Ltd., Jinan 250014, China;3.School of Civil Eng., Southwest Jiaotong Univ., Chengdu 610031, China;4.Eng. Management Center, China Railway, Beijing 100844, China)
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投稿时间:2021-09-21    修订日期:2021-11-18
中文摘要: 为研究川藏铁路掺石灰石粉混凝土抗低温硫酸盐侵蚀性能,通过对低温硫酸盐溶液浸泡侵蚀和电脉冲低温硫酸盐侵蚀作用下掺不同石灰石粉的水泥基材料的外观侵蚀变化等级、质量评价参数、抗压强度评价参数、孔隙特征及侵蚀产物进行测试,研究了低温环境下石灰石粉掺量对水泥基材料硫酸盐侵蚀行为的影响规律,并建立非单调Wiener随机过程模型,对低温环境下石灰石粉–水泥基材料硫酸盐侵蚀服役寿命进行了预测。结果表明:低温硫酸盐浸泡环境下,石灰石粉–水泥基材料在侵蚀周期内侵蚀反应缓慢,试件表面未出现可见剥落,试件质量持续增长;试件抗压强度先增后减;内部孔隙先细化后劣化;侵蚀180 d时,石灰石粉–水泥基材料侵蚀产物中有少量碳硫硅钙石生成。电脉冲作用下,加速了低温环境下石灰石粉–水泥基硫酸盐侵蚀反应,侵蚀60 d时,试件表面开始剥落,质量和强度下降,内部孔隙劣化;且石灰石粉掺量越多,碳硫硅钙石侵蚀破坏就越严重,石灰石粉掺量为40%的试件在侵蚀60 d时即有碳硫硅钙石生成;石灰石粉掺量为10%、20%的试件在侵蚀90 d才生成碳硫硅钙石。基于Wiener随机过程的可靠性寿命退化分析表明,电脉冲低温硫酸盐侵蚀作用下,石灰石粉掺量为10%、20%和40%的石灰石粉–水泥基材料室内加速侵蚀寿命分别为265、130及105 d。
Abstract:To research the performance of low-temperature sulfate corrosion resistance of concrete mixed with limestone powder of the Sichuan-Tibet railway, the effect of limestone powder-cement on the sulfate attack behavior of cement-based materials under low temperature was studied and the non-monotone Wiener stochastic process model was established to predict the service life of limestone powder-cement based materials under sulfate attack in a low-temperature environment by testing the change of appearance erosion grade, quality evaluation parameters, compressive strength evaluation parameters, pore characteristics, and erosion products of cement-based materials mixed with different limestone powder content under the sulfate solution immersion erosion and electric pulse sulfate erosion of low temperature. The results showed that the reaction was slow under the sulfate immersion in a low-temperature environment during the erosion period, the appearance of limestone powder-cement based materials did not appear visible spalling and its mass continued to increase. The strength first increased and then decreased, the turning point appeared at 120 days of the erosion. The pores were first refined and then deteriorated and the turning point appeared at 90 days of the erosion. A small amount of thaumasite was formed at 180 days of the erosion. The electrical pulse accelerates the sulfate attack of limestone powder-cement based materials in a low-temperature environment. The surface of the samples began to flake, the quality and strength of the samples decreased, and the internal pores deteriorated at 60 days under electric pulse and sulfate erosion in a low-temperature environment. The more the content of limestone powder was, the more serious the thaumasite erosion damage was. The samples with the limestone powder content of 40% generated thaumasite at 60 days of the erosion, while the samples with the limestone powder content of 10% and 20% generated thaumasite at 90 days of the erosion. The reliability life degradation analysis based on Wiener stochastic process showed that the indoor accelerated erosion life of cement-based materials, with 10%, 20%, and 40% limestone powder under electric pulse and sulfate attack in a low-temperature environment, was 265 days, 130 days, and 105 days, respectively.
文章编号:202100954     中图分类号:TU528    文献标志码:
基金项目:中国铁路总公司科技研究开发计划项目(P2018G004);长江学者和创新团队发展计划项目(IRT_15R29)
作者简介:第一作者:于本田(1979-),男,副教授,博士.研究方向:混凝土材料与结构耐久性.E-mail:yubentian@mail.lzjtu.cn
引用文本:
于本田,夏俊英,杨斌,王焕,谢超,张凯.川藏铁路石灰石粉–水泥基材料抗低温硫酸盐侵蚀研究[J].工程科学与技术,2022,54(4):1-11.
YU Bentian,XIA Junying,YANG Bin,WANG Huan,XIE Chao,ZHANG Kai.Sulfate Attack of Limestone Powder–Cement Based Materials Under Low Temperature of the Sichuan-Tibet Railway[J].Advanced Engineering Sciences,2022,54(4):1-11.