Effective applications of 1-D finite difference modeling for temperature prediction of concrete structures

Abstract

This paper introduces a 1-D finite difference model for analyzing the temperature distribution throughout the hardening phase in concrete structures. The model accounts for the degree of hydration-dependent internal heat rate and the solar irradiance on the receiving surface of a concrete structure, allowing for more accurate predictions of early-age behavior of concrete. The research involves the development and validation of the 1-D model using temperature measurements from an on-site concrete footing. Mesh sensitivity studies were conducted to optimize grid size for thermal analysis. The paper also explores the determination of suitable 2-D width-to-height ratios for employing the 1-D model, providing practical guidelines for its application. Major findings indicate that the 1-D model can accurately predict temperature evolution in early-age concrete and offers a cost-effective alternative to more complex 2-D, 3-D finite difference, and finite element models. For preliminary analysis and quick assessments, the 1-D model is advantageous due to its computational speed, and it holds significant potential for concrete temperature control and construction optimization.

Keywords

• 1-D finite difference
• Hydration heat
• Early-age concrete
• Concrete footing
• Solar irradiance
• Thermal analysis