|Table of Contents|

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

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

Issue:
2023年03期
Page:
1-9
Research Field:
建筑材料
Publishing date:

Info

Title:
Relationship between compressive strength and pore structure of CBC after single side freeze-thaw based on grey theory
Author(s):
HE Xiaoyan1; 2;  ZHOU Yao1; 2;  LIU Pingyuan1; 2;  ZHANG Tianxiao1; 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)
Keywords:
cement based composite material;  pore structure parameter;  grey theory;  single side freeze-thaw;  compressive strength
PACS:
TU528
DOI:
10.19815/j.jace.2021.10067
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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Last Update: 2023-05-20