|Table of Contents|

Research on spatiotemporal evolution patterns of carbonation zones in concrete under combined action of load and carbonation(PDF)

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

Issue:
2026年02期
Page:
86-96
Research Field:
建筑材料
Publishing date:

Info

Title:
Research on spatiotemporal evolution patterns of carbonation zones in concrete under combined action of load and carbonation
Author(s):
ZHAO Yanru1;  LI Long1;  GUAN He2;  WANG Xiaoyong3
(1. School of Civil Engineering, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 2. College of Science, Inner Mongolia University of Technology, Hohhot 010051, Inner Mongolia, China; 3. Tongliao City Housing and Urban-rural Development Bureau Comprehensive Security Center, Tongliao 028000, Inner Mongolia, China)
Keywords:
concrete carbonation;  partial carbonation zone;  CO2 diffusion correction model;  steel bar corrosion;  bending load;  carbonation depth;  pH value
PACS:
TU528
DOI:
10.19815/j.jace.2024.10009
Abstract:
In order to solve the problem of steel bar corrosion under the combined action of load and carbonation, a CO2 diffusion correction model under the combined action of load and carbonation was first established. Then, a pH model related to the CO2 concentration inside the concrete was introduced to explain the variation law of pH value inside the concrete under different carbonation time and load levels. Based on the pH value, the complete carbonation zone and partial carbonation zone of concrete were divided. Finally, the concentration of Ca(OH)2 and CaCO3 in concrete was predicted using CO2 diffusion correction model, and the corresponding relationship between the concentration of each substance and the depth of partial carbonation zone was studied. The results show that under the combined action of bending load and carbonation, as the load level increases, the pH value of tensile zone concrete decreases, the concentration of Ca(OH)2 decreases, the concentration of CaCO3 increases, the carbonation reaction becomes more complete, and the depth of partial carbonation zone decreases. The pH value of concrete compression zone increases, the concentration of Ca(OH)2 increases, the concentration of CaCO3 decreases, and the carbonation reaction rate decreases, resulting in an increase in the depth of partial carbonation zone and promoting the formation of partial carbonation zone. The carbonation depth corresponding to pH value of 9 calculated by the CO2 diffusion correction model is almost equal to the carbonation depth obtained by phenolphthalein testing, while the depth corresponding to pH value of 11.5 is much greater than the carbonation depth obtained by phenolphthalein testing. When the steel bars are in the area with a pH value less than 11.5, corrosion will occur. Therefore, using phenolphthalein test values as the thickness of steel bar protective layer in engineering is not reliable. It is necessary to ensure that the thickness of concrete protective layer is greater than the carbonation depth value corresponding to pH value of 11.5 in order to be more scientific and safe.

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Last Update: 2026-04-01