|Table of Contents|

Analysis on physical properties and corrosion causes of ribbed square steel bars in Gulangyu historic building(PDF)

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

Issue:
2023年06期
Page:
10-18
Research Field:
建筑材料
Publishing date:

Info

Title:
Analysis on physical properties and corrosion causes of ribbed square steel bars in Gulangyu historic building
Author(s):
SHI Jianguang1;  LI Guocong1;  HU Hongmei1;  XIE Yiren2;  CHEN Zhouyi1;  ZHU Jie1
(1. School of Architecture and Civil Engineering, Xiamen University, Xiamen 361005, Fujian, China; 2. Xiamen Hordor Engineering Design Group Co., Ltd., Xiamen 361004, Fujian, China)
Keywords:
historical architecture;  ribbed square steel bar;  microscopic test;  physical property;  corrosion product
PACS:
TU375
DOI:
10.19815/j.jace.2021.11117
Abstract:
Three kinds of ribbed square steel bars were sampled from Gulangyu historical buildings(1920-1930),the physical properties and corrosion causes of the steel bars were studied and analyzed in-depth by statistical analysis and microscopic test methods. The results show that the transverse rib height and the angle between the transverse rib and the longitudinal axis of the ribbed square steel bars used in the concrete components of Gulangyu historical building meet the requirements of the current norms at home and abroad, but the transverse rib spacing and the relative rib area do not meet the requirements. Metallography shows that no harmful banded structure, widmanstatten structure and tempered martensite structure is found in the ribbed square steel bars. Judging from the chemical composition, the steel used is similar to modern non-alloy steel(carbon steel), and mostly low carbon steel. However, the content of phosphorus and sulfur in most steel bars is high, indicating that the quality grade of steel is low at that time. The mechanical properties of square steel bars used in different historical buildings and different concrete components are quite different. The 1# steel bar and 2# steel bar meet the performance requirements of HRB400 and HRB600 in the current code respectively, but the 3# steel bar does not meet the performance requirements of HRB335 in the code. Therefore, in the calculation and analysis of structural reinforcement, the steel bars grade cannot be divided only according to the surface characteristics of reinforcement, and its mechanical properties need to be tested and identified. The composition of steel rust is more complex, including Fe3O4, α-FeOOH, β-FeOOH, Fe2O3, Fe(OH)3 and other components, according to this, it is judged that concrete carbonation, chloride corrosion in the marine environment and the combined effect of the two are the main causes of steel corrosion in Gulangyu historical buildings.

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Last Update: 2023-12-01