Evaluation of Mechanical Hardened Properties of Mortar Using Carbon-Free Fly Ash and Normal Fly Ash

• Published in: IOP conference series. Materials Science and Engineering Vol. 829; no. 1; pp. 12016 - 12022
• Main Authors: Nazari, Ghawsaddin, Takayuki, Sato, Date, Shigeyuki
• Format: Journal Article
• Language: English
• Published: Bristol IOP Publishing 01.04.2020
• Subjects: Air-entraining admixtures; Carbon; Compressive strength; Curing; Fly ash; Mortars (material); Particle size distribution; Pore size distribution
• ISSN: 1757-8981; 1757-899X
• DOI: 10.1088/1757-899X/829/1/012016

Usage of mineral admixture and chemical admixture in concrete or mortar is a usual solution to reach full compaction, particularly where reinforcement blockage and lack of skilled labour happen. In this paper effect of mineral admixtures (Carbon-free fly ash, hereafter CfFA, and nFA) on hardened properties of mortar such as compressive strength, Pore size distribution and, and micro structures have been investigated. As a result, it has been confirmed that mortar containing 15% CfFA slightly increased the compressive strength under water curing condition compared to those containing 15% normal fly ash. In addition, the pore-size distribution of the mortar has been affected by variation of materials and curing condition. Mortar containing 30% CfFA had a smaller threshold diameter in comparison to that of 30% FA; however, there is no significance differences in mortar containing 15% CfFA and FA. Furthermore, CfFA-based mortar increased the amount of entrained air compared to the mortar with normal fly ash.