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浙江大学学报(工学版)
浙江大学学报(工学版)  2019, Vol. 53 Issue (12): 2309-2316    DOI: 10.3785/j.issn.1008-973X.2019.12.007
土木工程、水利工程     
考虑个体差异的氯氧镁水泥混凝土涂层钢筋寿命预测
王鹏辉1(),乔宏霞1,2,*(),冯琼1,曹辉1
1. 兰州理工大学 甘肃省土木工程防灾减灾重点实验室，甘肃 兰州 730050
2. 中国科学院 青海盐湖研究所，青海 西宁 810083
Life prediction of coated steel with individual difference in magnesium oxychloride cement concrete
Peng-hui WANG1(),Hong-xia QIAO1,2,*(),Qiong FENG1,Hui CAO1
1. Key laboratory of Disaster Prevention and Mitigation in Civil Engineering of Gansu Province, Lanzhou University of Technology, Lanzhou 730050, China
2. Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810083, China
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摘要：

氯氧镁涂层钢筋混凝土（MOCRC）中涂层钢筋的制作误差导致不同MOCRC中涂层钢筋的寿命预测存在一定的差异，提出充分考虑个体差异性的溶液浸泡加速腐蚀试验，基于Wiener退化过程对涂层钢筋进行寿命预测. 判断涂层钢筋腐蚀电流密度是否符合Wiener退化过程；在考虑涂层钢筋个体差异性的前提下引入漂移系数进行建模；将考虑个体差异与未考虑个体差异的涂层钢筋寿命预测对比分析. 结果表明：溶液浸泡加速腐蚀试验下涂层钢筋的退化模型服从一个项数的指数函数. 基于Wiener退化过程，考虑个体差异性的涂层钢筋在25 000 d左右发生严重锈蚀，未考虑个体差异性的涂层钢筋在30 000 d左右发生严重锈蚀.
关键词： 涂层钢筋;  个体差异;  耐久性退化;  加速腐蚀试验;  Wiener函数    
Abstract:

The manufacturing error of coated steel bars in magnesium oxychloride coated reinforced concrete (MOCRC) leads to some differences in the life prediction of coated steel bars in different MOCRCs. The solution immersion accelerated corrosion test with full consideration of individual differences was proposed, and the life prediction of coated steel bars was based on Wiener degeneration process. Judge whether the corrosion current density of the coated steel bar complied with the Wiener degradation process. The drift coefficient was introduced for modeling under the individual differences of the coated steel bars. Coated steel bars' life predictions between considering individual differences and no individual differences were compared. Results show that the degradation model of coated steel bar under accelerated corrosion test in fixed concentration solution obeys one number term of exponential function. Under the Wiener degradation process, the coated steel bars with individual differences are severely corroded around 25 000 d, while the coated steel bars without individual differences are severely corroded around 30 000 d.
Key words: coated steel bar    individual differences    durability degradation    acceleration corrosion test    Wiener function
收稿日期: 2018-11-16 出版日期: 2019-12-17
CLC:  TU 528  
基金资助: 国家自然科学基金资助项目（51468039，51868044）；甘肃省自然科学基金资助项目(2017GS10844，2018GS10844)；兰州理工大学红柳一流学科建设计划资助项目
通讯作者: 乔宏霞     E-mail: 356984639@qq.com;qiaohongxia@lut.edu.cn
作者简介: 王鹏辉（1991—），男，博士生，从事混凝土耐久性研究. orcid.org/0000-0001-8704-5786. E-mail： 356984639@qq.com
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引用本文:

王鹏辉,乔宏霞,冯琼,曹辉. 考虑个体差异的氯氧镁水泥混凝土涂层钢筋寿命预测[J]. 浙江大学学报(工学版), 2019, 53(12): 2309-2316.

Peng-hui WANG,Hong-xia QIAO,Qiong FENG,Hui CAO. Life prediction of coated steel with individual difference in magnesium oxychloride cement concrete. Journal of ZheJiang University (Engineering Science), 2019, 53(12): 2309-2316.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2019.12.007    或    http://www.zjujournals.com/eng/CN/Y2019/V53/I12/2309

种类 ρ/
（g·mL?1） 		pH wa/
% 		Rw-r/
% 		Rb/
% 		${f_{{\rm{cu}},{\rm{k}}}}/{\rm{MPa}}$ d
3 d 7 d 28 d
PCA(I) 0.000 3 8.08 ≤3.88 34 0 168 149 139 0.02
表 1  减水剂各项物理指标
kg/m3
材料 密度 材料 密度
轻烧氧化镁 388.96 砂子 625.00
减水剂 16.02 石子 1 162.00
I级粉煤灰 68.64 工业氯化镁 147.81
耐水剂 4.58 水 135.59
表 2  氯氧镁水泥混凝土（MOCC）配合比
J / （μA·cm?2） 锈蚀情况 J / （μA·cm?2） 锈蚀情况
[0, 1) 无锈蚀 [0.5, 1) 中等腐蚀
[0.1, 0.5) 低腐蚀 [1, +∞) 严重腐蚀
表 3  钢筋腐蚀电流密度与锈蚀情况之间的对应关系
图 1  涂层钢筋在0~990 d的极化曲线图
x/d J /（10?3 μA·cm?2）
A组 B组 C组
0 0.045 0.039 0.047
90 0.260 0.482 0.385
180 0.685 0.856 0.754
270 1.130 1.060 1.120
360 1.280 1.160 1.260
450 1.460 1.270 1.180
540 1.580 1.330 1.460
630 1.710 1.650 1.850
720 1.940 2.150 2.240
810 2.380 2.470 2.780
900 3.590 3.270 2.690
990 3.280 3.470 3.030
表 4  涂层钢筋腐蚀电流密度
图 2  一元Wiener退化过程的自相关函数曲线
μA /cm2
${\varDelta _{ {t_i} - {t_{i - 1} } } }$ ΔJ /10?3
A组 B组 C组
${\varDelta _{{t_1} - {t_0}}}$ 0.215 0.443 0.338
${\varDelta _{{t_2} - {t_1}}}$ 0.425 0.374 0.369
${\varDelta _{{t_3} - {t_2}}}$ 0.445 0.204 0.366
${\varDelta _{{t_4} - {t_3}}}$ 0.150 0.100 0.140
${\varDelta _{{t_5} - {t_4}}}$ 0.180 0.110 ?0.080
${\varDelta _{{t_6} - {t_5}}}$ 0.120 0.060 0.280
${\varDelta _{{t_7} - {t_6}}}$ 0.130 0.320 0.390
${\varDelta _{{t_8} - {t_7}}}$ 0.230 0.500 0.390
${\varDelta _{{t_9} - {t_8}}}$ 0.440 0.320 0.540
${\varDelta _{{t_{10}} - {t_9}}}$ 1.210 0.800 ?0.090
${\varDelta _{{t_{11}} - {t_{10}}}}$ ?0.310 0.300 0.340
表 5  涂层钢筋腐蚀电流密度增量
图 3  腐蚀电流密度增量概率图
图 4  3组涂层钢筋腐蚀电流密度拟合图
估计方法 ${\mu _a}$/10?5 $\hat \sigma _a^{\rm{2}}$ b c ${\rm{ln } }\,L\left( \theta \right)$ AIC
M-1 0.690 9.660×10?14 0.002 1 73.84 ?139.6
M-2-A 4.500 3.400×10?6 ? ? ?473.8 946.3
M-2-B 4.432 3.398×10?6 ? ? ?442.6 881.2
M-2-C 4.714 3.523×10?6 ? ? ?432.5 861.0
表 6  考虑和不考虑个体差异的参数估计结果
图 5  不同方法的可靠度函数曲线
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