Open AccessEffect of Fly Ash Content in Shotcrete on Mechanical Properties
Author(s) -
Bin Wu,
Mingming Chai,
LI Shi-jia,
Jianping Yang
Publication year - 2022
Publication title -
journal of physics. conference series
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.21
H-Index - 85
eISSN - 1742-6596
pISSN - 1742-6588
DOI - 10.1088/1742-6596/2168/1/012013
Subject(s) - shotcrete , fly ash , shrinkage , compressive strength , raw material , materials science , flexural strength , ultimate tensile strength , geotechnical engineering , environmental science , composite material , engineering , chemistry , organic chemistry
As one of the key technologies of NATM (New Austrian Tunnel Method) construction, shotcrete has advantages such as simple, fast and adaptable technology, and becomes an indispensable modern construction method in tunnel construction. Adding some fly ash into shotcrete can reduce cracks, compensate shrinkage and improve workability. In this paper, raw materials are selected for mix design, and the mechanical properties of shotcrete with different fly ash content are experimentally studied. The test results show that the 28d compressive, flexural and tensile properties of sprayed concrete shotcrete gradually decrease with the increase of fly ash content. In order to avoid too much strength reduction and ensure structural safety, the fly ash ought to be controlled within a certain amount in the actual construction process.