Influence of fines from crushed aggregate on micro-mortar rheology

Title: Influence of fines from crushed aggregate on micro-mortar rheology
Author(s): M. Westerholm, B. Lagerblad
Paper category : conference
Book title: International RILEM Symposium on Self-Compacting Concrete
Editor(s): O. Wallevik and I. Nielsson
Print-ISBN: 2-912143-42-X
e-ISBN: 2912143713
Publisher: RILEM Publications SARL
Publication year: 2003
Pages: 165 - 173
Total Pages: 9
Nb references: 5
Language: English

Abstract: Natural glaciofluvial aggregates are becoming a restricted resource in many parts of Sweden. This, in addition to increased taxes on natural aggregates, will lead to an increased demand of crushed aggregates in the future. Crushed aggregates are not as smooth and rounded as water worked aggregates, which in many cases leads to impaired flow properties of the concrete and an increased demand of water or dispersive agents.In this work we have studied the influence of aggregate fines, i.e. particles with a maximum particle size of 125 µm, from crushed aggregates on the rheology of the micro mortar phase of self-compacting concrete (SCC). The aggregate fines originate from different rock species and are characterised by different mineralogy and particle characteristics such as size distribution and shape. The evaluation was done using contents of aggregate fines equal to those commonly occurring in both naturally and crushed fine aggregates.The results indicate that most aggregate fines from crushed fine aggregate can be used in SCC without impairing the flow properties if the amounts are kept at normal levels.

Online publication: 2003-08-21
Publication type : abstract_only
Public price (Euros): 0.00