Design Analysis and Test Verification of Double-Layer Gradient Coating Reinforced Concrete Flexural Strength

Author:

Pei Qiang1ORCID,Xiang Yihan1,Hu Shuncai1,Bao Yiwang2,Li Weihong1ORCID

Affiliation:

1. Dalian University, College of Architectural Engineering, Dalian 116622, China

2. China Academy of Building Materials Science, Beijing 100024, China

Abstract

The residual compressive stress of concrete members can offset the tensile stress caused by some external load and hinder the generation and expansion of surface cracks to enhance the flexural strength of concrete. In order to carry out this strengthening method, the single-layer and double-layer gradient coatings mixed by sulphate aluminium cement with different amounts of expansion agent on the surface of concrete specimens were discussed, and the theoretical calculation formula of surface compressive stress caused by this was deduced. Combined with experimental data, the influence of surface compressive stress on flexural strength of concrete was studied. The results demonstrate that the greater the surface compressive stress generated in the coating, the better the effect of improving the flexural strength of concrete. To obtain sufficient surface compressive stress, it is recommended that the cross-sectional product ratio of the substrate to the coating is more than 80; the higher the elastic modulus of the coating, the greater the surface compressive stress; the smaller the shrinkage rate of the coating, the greater the surface compressive stress. The improvement effect of double-layer gradient coating on the flexural strength of concrete is better than that of single-layer coating. Compared with the reference specimen without coating, the improvement rates of double-layer gradient coating on the early and late flexural strength of concrete are 57.7% and 45.7%, respectively.

Funder

Department of Science & Technology Guidance Plan Foundation of Liaoning Province

Publisher

Hindawi Limited

Subject

General Materials Science

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