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BESTÅR – Beständig betong med återvunnen ballast
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0002-0230-2200
RISE Research Institutes of Sweden, Materials and Production, Product Realisation Methodology.ORCID iD: 0000-0002-4568-4800
RISE Research Institutes of Sweden.ORCID iD: 0000-0001-6559-029x
RISE Research Institutes of Sweden, Built Environment, Infrastructure and concrete technology.ORCID iD: 0000-0003-4409-5788
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2023 (Swedish)Report (Other academic)
Abstract [en]

BESTÅR – Durable concrete with recycled aggregate In this project the properties of different types of recycled aggregate were investigated: recycled excavated masses, recycled construction and demolition waste (CDW), and reclaimed crushed concrete from concrete production. The content of different minerals, rocks, manmade materials, and chemical substances has been analysed, as well as the freeze-thaw resistance and alkali-silica reactivity. In addition to the testing of aggregate properties, concrete with recycled CDW was tested with respect to compressive strength, freeze-thaw resistance, carbonation resistance, and the risk for deleterious alkali silica reactions. The high water absorption of recycled CDW and reclaimed crushed concrete means that these materials can not be regarded as freeze-thaw resistant. As expected, the freeze-thaw resistance testing in salt water resulted in about five times as extensive scaling for concrete where 30% of the coarse aggregate fraction consisted of recycled CDW, as anticipated with concrete with only natural aggregates of typical igneous and metamorphic rocks. The content of potentially alkali-silica reactive particles was low in all batches (<8 %) and all batches were classified as innocuous aggregate when tested with RILEM AAR-2 and NT Build 295. When concrete with 30 % of the coarse aggregate consisting of recycled CDW and with two different binder compositions was tested, neither exceeded the maximum accepted expansion value. However, the results indicated that when the effective alkali content of the concrete is calculated, the alkali content of aggregate of recycled CDW or crushed reclaimed concrete must be included. The replacement of up to 30 % of the coarse aggregate by recycled CDW did not affect the concrete strength development, and the carbonation resistance even increased. Due to the higher water absorption of recycled CDW, it should be ascertained that all accessible pores in the aggregate are filled with water during mixing of the concrete, to avoid negative effects on the water-to-cement ratio and misleading measured air content.

Place, publisher, year, edition, pages
2023. , p. 83
Series
RISE Rapport ; 2023:121
Keywords [en]
Recycled aggregate, recycled excavated masses, recycled construction and demolition waste, CDW, reclaimed crushed concrete, alkali-silica reactivity, freeze-thaw resistance, carbonation resistance, compressive strength, microscopic analysis.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:ri:diva-72333ISBN: 978-91-89896-08-6 (electronic)OAI: oai:DiVA.org:ri-72333DiVA, id: diva2:1844934
Available from: 2024-03-15 Created: 2024-03-15 Last updated: 2024-03-15Bibliographically approved

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Helsing, ElisabethBrander, LinusDöse, MagnusGabrielsson, Ida

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CiteExportLink to record
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