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       杨志刚1 ,  董世博2 ,  仲小玲2 ,  张   晨2 ,  邬丛斌2

 

( 1 .  新疆路桥桥梁工程建设有限责任公司 ，乌鲁木齐 830021 ; 2. 新疆农业大学 交通与物流工程学院 ，乌鲁木齐 830052)

摘   要 ：针对西北地区冬季环境中混凝土结构物的耐久性问题 ，探究粉煤灰与纤维对混凝土服役期寿命的 增长趋势 ，选用两种不同配合比 ，开展冻融循环试验 ，对耐久性进行研究。建立 Weibull（威布尔） 概率分布函 数 ，对其退化规律建立模型 ；选用最小二乘法进行 Weibull（威布尔） 参数估计值的计算。结果表明：两组配比 下混凝土经过循环质量损失普通混凝土（简称 A 组） 为 4. 3% 、SY - A 粉煤灰混凝土（简称 B 组） 为 3 . 63% ; 相对动弹性模量损伤 A 组为 35. 4% 、B 组为 27. 4% ;  强度损失 A 组为 30. 6% 、B 组为 21 . 9% ;  根据寿命预测 A 组循环 345 次 、B 组循环 450 次达到极限。依据 Weibull 函数构建的图像模型能有效的描述寿命损失的过程 ，可 反应出结构物失效点 ，Weibull 函数能有效预测混凝土的服役寿命。

关键词：抗冻性能 ；模型预测 ；强度损失 ；动弹模量 ；快冻法

中图分类号：U444           文献标志码：A

          

文章编号： 1005- 8249   (2025)  03- 0023- 06 

DOI:10. 19860/j.cnki.issn1005 - 8249.2025 .03 .005

Yang Zhigang¹, Dong Shibo², Zhong Xiaoling²，Zhang Chen²，Wu Congbin²

(1. Xinjiang Road and Bridge Engineering Construction Co., Ltd., Urumqi 830021; 2. College of Transportation and Logistics Engineering, Xinjiang Agricultural University, Urumqi 830052；）

Abstract: In order to solve the durability problem of concrete structures in the winter environment of Northwest China, the growth trend of fly ash and fiber on the service life of concrete was explored, and two different mix ratios were selected to carry out freeze-thaw cycle tests to study the durability. The Weibull probability distribution function was established, and the degradation law was modeled. The least squares method was used to calculate the estimated value of Weibull parameters. The results show that the mass loss of concrete after circulation is 4.3% for ordinary concrete (referred to as group A) and 3.63% for SY-A fly ash concrete (referred to as group B) under the ratio of the two groups. The relative dynamic elastic modulus damage was 35.4% in group A and 27.4% in group B. The strength loss was 30.6% in group A and 21.9% in group B. According to the lifespan, it is predicted that the limit will be reached at 345 cycles in group A and 450 cycles in group B. The image model constructed based on the Weibull function can effectively describe the process of life loss, reflect the failure point of the structure, and the Weibull function can effectively predict the service life of concrete.

Keywords: frost resistance; model prediction; strength loss; dynamic modulus; quick-freeze method

基金项目： 中央引导地方科技发展资金  (ZYYD2025QY18) ;  校级研究生科研创新计划项目 (XJAUGRI2025049) 。

作者简介：杨志刚  (1981 —) ,  男 ，本科 ，高级工程师 ，研究方向：道路桥梁检测。

通信作者：仲小玲  (1985—) ,  女 ，硕士 ，副教授／高级工程师 ，研究方向：道路工程。

      收稿日期：2024 - 12 - 31