The influence of crushing processes and mineralogy of aggregates on their shape properties and susceptibility to degradation. (17th May 2021)

• Record Type: Journal Article
• Authors: Diógenes, Lara; Maia, Renan; Bessa, Iuri; Castelo Branco, Verônica; Nogueira Neto, José; Silva, Francisco
• Is Part Of: Construction & building materials. Volume 284(2021)
• Publication Date: 2021-05-17
• Subjects: Mineral aggregates -- Mineralogy -- Crushing processes -- Shape properties -- Degradation resistance; Building materials -- Periodicals; 624.18
• DOI: 10.1016/j.conbuildmat.2021.122745
• Languages: English
• ISSNs: 0950-0618

Abstract

Highlights: In-depth analysis of aggregates' mineralogy, crushing, morphology, and degradation. Lithotypes content and grain-to-grain contact influence shape properties variation. Cone crusher led to high-sphericity aggregates, proper to concrete production. Higher biotite content increases particle resistance to breakage (Treton). Micro-Deval protocol significantly impacts on particles' angularity/texture only. Abstract: The selection of appropriate aggregates should consider important factors such as mineralogical characteristics and crushing processes. This paper aims to investigate the relations between aggregates sources, crushing processes, shape, and resistance to degradation. Therefore, different materials were compared in terms of mineralogy and shape. Each material was also submitted to degradation tests to evaluate breakage, abrasion, and polishing resistance. The heterogeneity of gneissic aggregates led to increase on angularity of coarse particles as their sizes reduced and also to varying behavior due to wearing. Cone crushers led to higher sphericity and lower angularity, thus being suitable for Portland cement concrete.