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Evaluation of the quality of fine materials and filler from crushed rocks in concrete production
RISE, SP – Sveriges Tekniska Forskningsinstitut, CBI Betonginstitutet AB.
2014 (English)In: Construction and Building Materials, ISSN 0950-0618, E-ISSN 1879-0526, Vol. 67, no A, p. 121-126Article in journal (Refereed)
Abstract [en]

Crushed rocks are, in general, more flaky and irregular in shape than natural aggregates. Especially granitic rocks display variable amounts or flaky free micas in the finer fractions when crushed. Moreover, the crushed rocks result in more fine material. Fillers can, in combination with superplasticizers and if the quality is appropriate be used to expand the paste phase of the concrete and thus be used to lower the cement consumption. To utilize the filler optimally one needs to evaluate the filler quality._x000D_ _x000D_ There are several methods to evaluate the filler. In this article different methods both in regards to the material properties and the behavior in mortar and micro mortar tests are compared and evaluated. The analysis shows the importance of understanding the effect of both the particle shape and flakiness in the fine fractions and the properties of the material in the finest fraction i.e. <10 μm. This is very much related to the mineralogy of the rock.

Place, publisher, year, edition, pages
2014. Vol. 67, no A, p. 121-126
Keywords [en]
Concrete aggregate, Crushed rocks, Filler, Fine material, Micas, Mineralogy, Test methods
National Category
Other Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-2699Local ID: 4631OAI: oai:DiVA.org:ri-2699DiVA, id: diva2:960302
Available from: 2016-09-07 Created: 2016-09-07 Last updated: 2017-11-21Bibliographically approved

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