Effect of Recycled Iron Powder as Fine Aggregate on the Mechanical, Durability, and High Temperature Behavior of Mortars

Effect of Recycled Iron Powder as Fine Aggregate on the Mechanical, Durability, and High Temperature Behavior of Mortars

Ali, Md Kawsar (University of Asia Pacific)
Miah, Md Jihad (University of Asia Pacific)
Paul, Suvash Chandra (International University of Business Agriculture and Technology)
Babafemi, Adewumi John (Stellenbosch University)
Kong, Sih Ying (Monash University Malaysia)
Šavija, B. (TU Delft Materials and Environment)

2020

This study evaluates the mechanical, durability, and residual compressive strength (after being exposed to 20, 120, 250, 400 and 600 °C) of mortar that uses recycled iron powder (RIP) as a fine aggregate. Within this context, mechanical strength, shrinkage, durability, and residual strength tests were performed on mortar made with seven different percentages (0%, 5%, 10%, 15%, 20%, 30% and 50%) of replacement of natural sand (NS) by RIP. It was found that the mechanical strength of mortar increased when replaced with up to 30% NS by RIP. In addition, the increase was 30% for compressive, 18% for tensile, and 47% for flexural strength at 28 days, respectively, compared to the reference mortar (mortar made with 100% NS). Shrinkage was observed for the mortar made with 100% NS, while both shrinkage and expansion occurred in the mortar made with RIP, especially for RIP higher than 5%. Furthermore, significantly lower porosity and capillary water absorption were observed for mortar made with up to 30% RIP, compared to that made with 100% NS, which decreased by 36% for porosity and 48% for water absorption. As the temperature increased, the strength decreased for all mixes, and the drop was more pronounced for the temperatures above 250 °C and 50% RIP. This study demonstrates that up to 30% RIP can be utilized as a fine aggregate in mortar due to its better mechanical and durability performances.

Durability
Mechanical properties
Mortar
Recycled iron powder
Temperature resistance

http://resolver.tudelft.nl/uuid:3c7503cf-531c-4959-b9b8-00dcd2d64c11

https://doi.org/10.3390/ma13051168

1996-1944

Materials, 13 (5)

Institutional Repository

journal article

© 2020 Md Kawsar Ali, Md Jihad Miah, Suvash Chandra Paul, Adewumi John Babafemi, Sih Ying Kong, B. Šavija