01741724

Component

https://doi.org/10.1177/0361198120919406

As a type of fiber-reinforced composite, engineered cementitious composite (ECC) has the characteristics of multi-cracking and strain-hardening. In this study, domestic materials were used to prepare ECC incorporating a high volume of fly ash. The effect of fly ash on the microscopic and macroscopic performance was studied, and the relationship between the microscopic structure and macroscopic performance was also analyzed. The microscopic pore structure was analyzed by mercury intrusion porosimetry (MIP) with the aim of improving understanding of the variability in ductility. The results obtained show that mesopores and macropores (pores with a diameter greater than 20?nm) have a great influence on the fracture toughness and strength of the matrix, while micropores (diameter less than 20?nm) had no obvious effect on the fracture toughness and strength of the matrix. The fracture toughness and strength of the matrix are negatively correlated with the total porosity. Microscopic analysis showed that high-volume fly ash is conducive to the ductility of ECC and the macroscopic experiments verify this finding from the microscopic analysis.

Data are included in the paper. © National Academy of Sciences: Transportation Research Board 2020.

English

pp 653-662

2020-8

Transportation Research Record: Journal of the Transportation Research Board

Web

References (33)

Ductility; Engineered materials; Fiber composites; Fly ash; Fracture properties; Microscopy; Pore size distribution; Porosity; Strength of materials

Highways; Materials

TRIS, TRB, ATRI

May 27 2020 3:04PM