Abstract

The present study investigates tensile properties of concrete with and without fly ash at early age, such as tensile Young’s modulus, strength and creep. Some Young’s modulus of fly ash concrete for thermal crack analysis was compared with the tensile Young’s modulus, secant modulus, initial tangent modulus and linear modulus obtained from the direct tension test and compression test. The tensile creep test was also performed to obtain the specific creep behavior considering decrease in elastic strain due to stiffness development at early age during creep test. The results show that the Young’s modulus for crack evaluation can be obtained from the compression test based on the stress range less than the splitting tensile strength, while the compressive secant modulus was smaller than the tensile Young’s modulus. The decrease of the elastic strain at early age contributes more to the evaluation of the tensile creep than the use of the fly ash mixing.

Highlights

  • Controlling cracks caused by various factors is an important issue for concrete engineers in order to construct durable structures

  • The present study aimed to obtain the tensile properties for thermal stress analysis of fly ash concrete at early age

  • This paper describes Young’s modulus and tensile creep behavior based on decreasing elastic strain due to development of stiffness

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Summary

Introduction

Controlling cracks caused by various factors is an important issue for concrete engineers in order to construct durable structures. Numerical simulations are often performed in order to predict thermal cracking Tensile properties, such as Young’s modulus, strength and creep, are required for an estimation of tensile stress which causes thermal cracking. Mimura et al [5] reported that the tensile Young’s modulus based on the direct tension test by using the slender reinforced concrete (RC) specimen is higher than the compressive modulus (secant modulus) at early age. Linear modulus which is taken from a regression line of a compressive stress-strain curve in the range of stresses less than the splitting tensile strength was evaluated These Young’s moduli of fly ash concrete were determined by the compression tests or the direct tension tests. In order to obtain the tensile mechanical properties development during creep test, splitting tensile strength and Young’s modulus were examined at various ages. Density 1.00 g/cm3 3.16 g/cm3 2.24 g/cm3 2.62 g/cm3 2.67 g/cm3 2.67 g/cm3 1.07 g/cm3 1.04 g/cm

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