Using ultrafine fly ash to achieve low-carbon, high strength and high toughness engineered cementitious composites LC-HSTC

verfasst von
Minjin Cai, Hailiang Zhu, Yang Wan, Hehua Zhu, Timon Rabczuk, Xiaoying Zhuang
Abstract

Conventional green engineered cementitious composites (ECC) with ordinary Grade I fly ash usually show insufficient tensile strength and toughness. To produce a low-carbon, high strength, and high toughness ECC (LC-HSTC), this study used ultrafine fly ash to substitute 80% binder mass. The ultrafine fly ash has an average size of 2.5 um, which is 5 times smaller than that of ordinary Grade I fly ash. A series of comparative tests were carried to investigate the workability, tensile behavior, tensile toughness, flexural property, compressive strength, fiber bridging ability of the LC-HSTC. Results show that the tensile strength, elongation, flexural strength, compressive strength and strain energy density of the LC-HSTC is 11 MPa, 6.5%, 27 MPa, 88 MPa and 500 kJ/m3, respectively, indicating a significant enhancement in the comprehensive performance compared to other similar materials. Sustainability analysis reveals that the cost of LC-HSTC (526.83 $/m3) is comparable to the other green fly ash ECCs and its embodied carbon (348.74 kg/m3) is over 17.75% lower than others. The findings indicate that ultrafine fly ash has significant advantages for the development of high strength and low carbon ECC.

Organisationseinheit(en)
Fakultät für Mathematik und Physik
Externe Organisation(en)
Tongji University
Bauhaus-Universität Weimar
Shanghai Tunnel Engineering Co. Ltd.
Typ
Artikel
Journal
Case Studies in Construction Materials
Band
20
Anzahl der Seiten
24
ISSN
2214-5095
Publikationsdatum
07.2024
Publikationsstatus
Veröffentlicht
Peer-reviewed
Ja
ASJC Scopus Sachgebiete
Werkstoffwissenschaften (sonstige)
Elektronische Version(en)
https://doi.org/10.1016/j.cscm.2024.e03259 (Zugang: Offen)