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A modified pycnometer method to determine the water absorption of combined crushed concrete aggregate fractions
University of Borås, Faculty of Textiles, Engineering and Business. (Civil Engineering)ORCID iD: 0000-0003-4804-382x
University of Borås, Faculty of Textiles, Engineering and Business. (Civil Engineering)ORCID iD: 0000-0001-9867-7631
University of Borås, Faculty of Textiles, Engineering and Business. (Civil Engineering)ORCID iD: 0000-0003-2194-9277
2019 (English)In: International Conference on Sustainable Materials, Systems and Structures (SMSS2019): Novel Methods for Characterization of Materials and Structures / [ed] Gabrijel I, Grosse C, Skazlić M, 2019, p. 286-292Conference paper, Published paper (Refereed)
Sustainable development
According to the author(s), the content of this publication falls within the area of sustainable development.
Abstract [en]

Crushed Concrete Aggregates (CCA) as fine and coarse aggregates in new concrete helps achieve closed-loop recycling. Assessment of workability, mechanical properties and durability of concrete demands knowledge of the water absorbed by the CCA. The EN 1097-6standard method is difficult to execute due to the presence of entrapped air and CCAsedimentation while performing water absorption experiment for fine CCA. Additionally, the assessment of Saturated Surface Dry (SSD) state seems operator specific and nonreproducible;moreover, giving water absorption measurement only at 24 hours. However, findings from this paper show measurements at 15 minutes is influential for concrete workability. The modified pycnometer method analyses the water absorption of a combined fraction consisting of coarse and fine CCA as proportioned in a given concrete recipe. Furthermore, sedimentation and entrapped air are prevented by pre-soaking the CCA in a solution of distilled water and poly-carboxylate based superplasticizer before commencing the experiment. Ultimately, the combined fraction is drained to SSD condition by vacuum filtration, which is easy to handle by professional operators. In this way, the water absorption development is measured from starting point to 24 hours for the combined fraction to determine the appropriate water amount to saturate CCA during concrete mixing.

Place, publisher, year, edition, pages
2019. p. 286-292
Keywords [en]
crushed concrete aggregate, water absorption, pcynometer, SSD, sustainability
National Category
Architectural Engineering Building Technologies Other Civil Engineering
Research subject
Resource Recovery
Identifiers
URN: urn:nbn:se:hb:diva-15948ISBN: 978-2-35158-217-6 (electronic)OAI: oai:DiVA.org:hb-15948DiVA, id: diva2:1302746
Conference
International Conference on Sustainable Materials, Systems and Structures (SMSS2019), Rovin, March 20-22, 2019.
Projects
RE:ConcreteAvailable from: 2019-04-05 Created: 2019-04-05 Last updated: 2019-04-12Bibliographically approved

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Sadagopan, MadumitaMalaga, KatarinaNagy, Agnes

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