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Modified pycnometer method to measure the water absorption of crushed concrete aggregates
University of Borås, Sweden.
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology. University of Borås, Sweden.ORCID iD: 0000-0001-9867-7631
University of Borås, Sweden.
2020 (English)In: Journal of Sustainable Cement-Based Materials, ISSN 2165-0373, E-ISSN 2165-0381Article in journal (Refereed) Epub ahead of print
Abstract [en]

The water absorption of crushed concrete aggregates (CCA) has a major influence on concrete workability. In order to determine the water absorption of CCA, a more porous material than natural aggregates, modifications to the standard pycnometer method are proposed as: (1) Water absorption is measured on a combined fraction CCA consisting of fine and coarse aggregates proportioned according to concrete recipe. (2) The CCA is pre-processed to mitigate sedimentation. (3) Saturated surface dry condition of aggregate is assessed by vacuum filtration and ocular technique. Water absorption development is measured at 0 min, 15 min, and 24 h. About 90% of the 24-h water absorption occurs in 15 min, value which is introduced in the concrete recipe; slump flow and compressive strength are determined. The modified pycnometer method shortens test duration, is operator insensitive and gives reliable water absorption result for CCA leading to concrete workability fitting industrial application. © 2020, © 2020 The Author(s).

Place, publisher, year, edition, pages
Taylor and Francis Ltd. , 2020.
Keywords [en]
Crushed concrete aggregates, pycnometer, recycled aggregates, saturated surface dry condition, sustainability, water absorption
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:ri:diva-43947DOI: 10.1080/21650373.2020.1715902Scopus ID: 2-s2.0-85078489111OAI: oai:DiVA.org:ri-43947DiVA, id: diva2:1394663
Available from: 2020-02-19 Created: 2020-02-19 Last updated: 2020-02-19Bibliographically approved

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Malaga, Katarina

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