A Compressive Peak Strength Model for CFRP-Confined Thermal Insulation Materials under Elevated Temperature.

Yeou-Fong Li,Ying-Kuan Tsai,Wai-Keong Sio

doi:10.3390/ma13010026

Yeou-Fong Li, Ying-Kuan Tsai + Show 1 more

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https://doi.org/10.3390/ma13010026

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Abstract

In this paper, a compressive peak strength model for CFRP-confined thermal insulation materials under elevated temperature was proposed. The thermal insulation material was made by Portland cement with different portions of perlite. The compressive strengths of four different perlite ratios in weight, such as 0%, 10%, 20%, and 30% of thermal insulation materials, confined by one-layer, two-layer, and three-layer carbon fiber-reinforced polymer (CFRP) composite materials, were obtained. The test results indicated that the specimen’s compressive strength decreased with an increase in the amount of perlite replacement and increased with an increase in the number of CFRP wrapping layers. Based on the test results, a theoretical compressive peak strength model with some parameters was proposed. In the meantime, the compressive strengths of the above four different perlite ratios of thermal insulation materials under elevated temperature, such as ambient temperature, 100 °C, 150 °C, 200 °C, 250 °C, and 300 °C, were obtained. For compression tests of specimens with a fixed amount of perlite, the test results indicated that the specimen’s compressive strength decreased with an increase in temperature, highlighting a thermal softening phenomenon. Based on the test results, a compressive peak strength model with a thermal softening parameter was proposed to predict the peak strength under elevated temperature. Finally, a compressive peak strength model for thermal insulation material with CFRP confinement under different elevated temperature was derived, and it achieved acceptable results in comparison to the experimental results.

Highlights

As a global industry, the petrochemical industry is an inextricable part of our lives as it is a vital material for consumers and high-tech products
To improve of the strengthening method discussed in Reference [1] by mixing2 with other potential additives, we investigate the effect of elevated temperature and perlite replacement discussed in Reference [1] by mixing with other potential additives, we investigate the effect of ratio on the performance of carbon fiber-reinforced polymer (CFRP)-confined concrete under compression
From the the above above test test results, results, the the compressive compressive peak peak strength strength of of the the insulation insulation material material specimens specimens increased due to confinement by different numbers of layers of composite material, as compared increased due to confinement by different numbers of layers of CFRP composite material, as to those specimens without confinement

Summary

Introduction

The petrochemical industry is an inextricable part of our lives as it is a vital material for consumers and high-tech products. Transmission mild steel pipelines are viewed as the most cost-efficient way to transport petroleum products. These pipelines are sensitive to corrosion in harsh environments, in the presence of acid, chloride, and sulfur ingress media. The current strengthening methods for coating thermal insulation materials on the surface of pipelines still have issues to overcome, especially when the corroded pipeline is installed in a high-temperature environment.

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