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《建筑科学与工程学报》[ISSN:1673-2049/CN:61-1442/TU]

卷:

40卷

期数:

2023年03期

页码:

1-9

栏目:

建筑材料

出版日期:

2023-05-20

文章信息/Info

Title:

Relationship between compressive strength and pore structure of CBC after single side freeze-thaw based on grey theory

文章编号:

1673-2049(2023)03-0001-09

作者:

何晓雁^1,2,周 曜^1,2,刘平源^1,2,张天晓^1,2

(1. 内蒙古工业大学 土木工程学院,内蒙古 呼和浩特 010051; 2. 内蒙古工业大学 内蒙古自治区建筑检测鉴定与安全评估工程技术研究中心,内蒙古 呼和浩特 010051)

Author(s):

HE Xiaoyan^1,2, ZHOU Yao^1,2, LIU Pingyuan^1,2, ZHANG Tianxiao^1,2

(1. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 2. Inner Mongolia Autonomous Region Building Inspection Appraisal and Safety Assessment Engineering Technology Research Center, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China)

关键词:

水泥基复合材料;  孔结构参数;  灰色理论;  单面冻融;  抗压强度

Keywords:

cement based composite material;  pore structure parameter;  grey theory;  single side freeze-thaw;  compressive strength

分类号:

TU528

DOI:

10.19815/j.jace.2021.10067

文献标志码:

A

摘要:

通过对水泥基材料(CBC)进行以NaCl溶液为冻融介质的单面冻融试验,探究CBC抗压强度及含气量、气泡间距系数、气泡比表面积、气泡平均弦长、气泡弦长大于20 μm的弦长频率等微观孔结构参数随冻融循环次数增加的变化规律,并运用灰色理论对抗压强度与各孔结构参数的内在联系进行分析。利用灰色相对关联度筛选出微观孔结构参数中与抗压强度关联最大的参数,对其进行了相关模拟和预测,并建立宏观性能与微观孔结构参数间的定量关系。结果表明:随冻融循环次数增加,CBC抗压强度逐渐降低,冻融循环后期下降速率加快; 试验过程中试件内部含气量、气泡间距系数、气泡平均弦长逐渐增大,而气泡比表面积逐渐减小; 灰色Verhulst模型相较于GM(1,1)模型更适用于气泡弦长大于20 μm的弦长频率的模拟; 采用灰靶决策模型定义的综合孔结构参数与抗压强度关联性更强,基于综合孔结构参数建立的模型精度更高。

Abstract:

Through the single-side freeze-thaw test of cement-based composite materials(CBC)with NaCl solution as the freeze-thaw medium, the compressive strength and micro-pore structure parameters of CBC, such as air content, bubble spacing coefficient, bubble specific surface area, bubble average chord length and chord length frequency with bubble chord length larger than 20 μm, were investigated with the increase of freeze-thaw cycles. The internal relationship between compressive strength and pore structure parameters was analyzed by grey theory. The parameters with the greatest correlation with compressive strength among the microscopic pore structure parameters were screened by grey relative correlation degree, and the related simulation and prediction were carried out, and the quantitative relationship between macroscopic properties and microscopic pore structure parameters was established. The results show that with the increase of freeze-thaw cycles, the compressive strength of CBC decreases gradually, and the rate of decline in the later stage of freeze-thaw cycles increases. During the test, the internal air content, bubble spacing coefficient and average chord length of bubbles gradually increase, while the specific surface area of bubbles gradually decrease. Compared with the GM(1,1)model, the grey Verhulst model is more suitable for the simulation of the chord length frequency of the bubble string larger than 20 μm. The comprehensive pore structure parameters defined by the grey target decision model have a stronger correlation with the compressive strength, and the model based on the comprehensive pore structure parameters has higher accuracy.

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备注/Memo

备注/Memo:

收稿日期:2021-10-21
基金项目:国家自然科学基金项目(11862022); 内蒙古自治区自然科学基金项目(2020LH05008); 内蒙古自治区教育厅项目(NJZY19080)
作者简介:何晓雁(1970-),女,副教授,硕士生导师,E-mail:2732108278@qq.com。

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更新日期/Last Update: 2023-05-20