| Title |
Stress-Strain Relationship of Heavyweight Concrete Using Magnetite Aggregate |
| Authors |
Mun, Ju-Hyun ; Mun, Jae-Sung ; Yang, Keun-Hyeok |
| Keywords |
Heavyweight Concrete ; Stress-Strain Relationship ; Modulus of Elasticity ; Strain at Peak Stress |
| Abstract |
To evaluate the stress-strain relationship of heavyweight concrete (HWC) and formulate a reasonable model, 26 mixes were prepared under various parameters including water-to-binder ratio, replacement level with natural aggregate for magnetite aggregates, and the replacement level of fly ash. Based on the current test results and existing data, modulus of elasticity, and strains at the peak stress and at 50% of peak stress in the descending branch were formulated as a function of compressive strength and unit weight of concrete. The factor to determine the slopes of ascending and descending branches of the stress-strain curve was solved by numerical analysis and formulated through the parametric study. Test results demonstrated that the stress-strain behavior of concrete is significantly affected by its unit weight as well as its compressive strength. ACI 349-06 provision unconservatively predicts the modulus of elasticity of HWC, and CEB-FIP and EC2 provisions overestimate the strain at peak stress. Meanwhile, the proposed models are in good agreement with test results, giving a consistency with the trends observed in tests. |