A Constitutive Model of High-Early-Strength Cement with Perlite Powder as a Thermal-Insulating Material Confined by Caron Fiber Reinforced Plastics at Elevated Temperatures

Abstract

A parabolic stress–strain constitutive model for inorganic thermal-insulating material confined by carbon fiber-reinforced polymer (CFRP) exposed to a surrounding elevated temperature was proposed in this paper. The thermal-insulating material used in this study was composed of high-early-strength cement (HESC) and perlite powder. The compression strengths of four kinds of perlite powder composition ratios of thermal-insulating materials cylindrical specimens which were confined by one, two, and three-layer CFRP composite materials were acquired. The experimental results showed that the compression strength was enhanced as the amount of perlite substitute decreased or as the number of CFRP wrapping layers increased. The Mohr–Columb failure criteria were adopted to predict the maximum compressive strength of CFRP-confined inorganic thermal-insulating material. The strain at the maximum compressive strength was found from the experimental results, and the corresponding axial strain at the maximum compressive strength in the constitutive model was determined from the regression analysis. Furthermore, the compressive strengths of the four different perlite composites of thermal-insulating materials were obtained when heating the specimens from ambient temperature to 300 °C. The compressive strength decreased with an increase in temperature, and a thermal softening parameter model was proposed; the thermal softening parameter was determined from the experimental maximum compressive strength at an elevated temperature. Combining the above two models, the constitutive model of HESC with perlite powder additive as a thermal-insulating material confined by CFRP under elevated temperature was proposed.

A General Temperature-Dependent Stress–Strain Constitutive Model for Polymer-Bonded Composite Materials

“…The overall residuals on all the tension data are evaluated and presented in Figure 9. The value corresponding to the sum of squared errors (SSE) is 3.0686 × 10 −4 using Equation (8). The SSE is given as…”

“…By compounding different filler materials with polymer, new functional materials can be made, providing a viable technology for on-demand material design and engineering [ 1 ]. Applications of PBMs include, but are not limited to, polymer-bonded magnetics [ 2 , 3 ], energetics [ 4 , 5 ], aluminum [ 6 ], fiber [ 7 , 8 ], and many others [ 9 , 10 , 11 ]. To utilize those functional materials in critical applications, understanding their mechanical properties and deformation behaviors under different loading and temperature conditions is of great importance in meeting the basic design criteria.…”

A Constitutive Model for Circular and Square Cross-Section Concrete Confined with Aramid FRP Laminates

“…Razvi and Saatcioglu (1998) proposed a constraint equation for high-strength concrete [29]. Li's research proposed the constitutive models for normal-strength and low-strength cylindrical concrete confined with CFRP, which was adopted from the Mohr-Coulomb failure theory to predict the compressive strength of CFRP-confined concrete [30][31][32][33][34]. Wang et al (2012) found that the CFRP-confined-squarecross-section column failed suddenly via CFRP rupture at the corner of the column, and a modified confinement pressure model was proposed which considered the influence of cross-section size, effective rupture strain of CFRP, as well as hoop reinforcement [35].…”