[This article belongs to Volume - 54, Issue - 09]
Gongcheng Kexue Yu Jishu/Advanced Engineering Science
Journal ID : AES-13-11-2022-402

Title : Stress–Strain Relationship of Alkali-resistant Glass Fiber ECC Composites Under Compression
ZHANG Qin, ZHU Xiaopeng, DAI Huanhuan, LI Zhen, YE Taoping, LIU Ronghao,

Abstract :

Alkali-resistant glass fiber has good mechanical performance, economy and durability. By adding alkali-resistant glass fiber, cement-based composites can be well strengthened, which has a wide range of engineering application prospects. To study the compressive properties and the stress–strain relationship of alkali-resistant glass fiber engineered cementitious composites (ECC), 33 groups of high-performance cement-based material specimens were tested under axial load. The effects of fiber content, fiber length, and water-cement ratio on the compressive properties and stress–strain relationship of alkali-resistant glass fiber ECC were emphatically analyzed, and the calculation model for the stress–strain relationship of alkali-resistant glass fiber ECC was proposed. The results show that the crack resistance, mechanical property, and deformation capacity of cement-based materials can be significantly improved by adding alkali-resistant glass fiber under uniaxial compression. The improvement of compressive strength and deformation capacity of the alkali-resistant glass fiber ECC is related to the fiber content, fiber length, and water-cement ratio. The compressive strength and deformation capacity of alkali-resistant glass fiber ECC specimens roughly tend to increase with the increase of fiber content and length, but the compressive strength of specimens decreases due to the obvious “agglomeration” phenomenon when the fiber content is too much. The compressive strength of specimens is mainly affected by the water-cement ratio, and it exhibits smaller with a larger water-cement ratio. When the fiber mass content is 6.5%, the fiber length is 18 mm and the water-cement ratio is 0.32, the comprehensive mechanical properties of alkali-resistant glass fiber ECC are relatively better, and compared with the comparison specimens, the compressive strength and deformation capacity can be increased by 25.6% and 88.0%, respectively. The calculation results of the proposed stress–strain relationship model are in good agreement with the experimental values, which can be used to describe the whole process of compression failure of alkali-resistant glass fiber ECC.