Uniaxial Compressive Test of High Ductile Fiber‐Reinforced Concrete and Damage Constitutive Model

Abstract

It has been widely recognized that the constitutive model plays an essential role in engineering application of high ductile fiberreinforced concrete (HDC). In this research, uniaxial compressive tests were conducted on nine groups of HDC specimens with different mixture ratios and one group of mortar matrix specimens as comparison, discussing the effect of fiber content, watercement ratio, fly ash content, and sand-binder ratio. According to the characteristics of stress-strain curve of HDC under uniaxial compression, a damage constitutive model was proposed by introducing two damage threshold parameters and then was compared with other existing models. Results indicated that the damage model curves suggested in this paper were best consistent with experimental curves and substantially demonstrate the damage evolution process as well as the cracking resistance effect of fiber bridging stress.

Triaxial tests on high ductile concrete under different environmental conditions

“…At present, the research of HDC focuses on the mechanical properties such as uniaxial compression, uniaxial tension, and anti-bending. 23,24 Relatively few studies focus on HDC under triaxial stress. In this study, the triaxial compression tests of HDC under different environmental conditions are conducted to analyze the stress-strain response, peak stress, peak strain, and volumetric strain of HDC under different environments.…”

“…At present, the research of HDC focuses on the mechanical properties such as uniaxial compression, uniaxial tension, and anti‐bending 23,24 . Relatively few studies focus on HDC under triaxial stress.…”

Mechanical Properties of Desert Sand-Based Fiber Reinforced Concrete (DS-FRC)

“…They have the characteristics of higher tensile ductility and compression deformation properties, and the uniaxial tensile and compression strains can be over 3% and 0.5%, respectively [1,2]. Although, there are varieties of names such as engineered cementitious composites (ECC) [3,4], ultra-high performance fiber reinforced cementitious composites (UHPFRCC) [5,6], strain hardening cementitious composites (SHCC) [7][8][9], ultra-high toughness cementitious composites (UHTCC) [10][11][12] and fiber reinforced concrete (FRC) [13,14], they all maintain the essence of high ductility and have achieved good engineering applications [15][16][17][18][19]. The high ductility cementitious composites are composed of polyvinyl alcohol fiber (PVA) and fine aggregates, such as cement, fly ash, and fine river sand.…”

“…Currently, the worldwide use of high volumes of mineral admixtures (such as fly ash or slag) and available fine aggregates (such as tailings, sea sand and desert sand) are the main solutions. In addition, uniaxial tensile/compression testes are widely used to verify the high ductility of cementitious composites [14,[20][21][22][23][24][25][26][27].…”