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Återvinning av restbetong från fabrikstillverkning i ny betong
University of Borås, Faculty of Textiles, Engineering and Business.
University of Borås, Faculty of Textiles, Engineering and Business.
2018 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Recycling of residual concrete from factory production in new concrete (English)
Abstract [sv]

Betong är ett av våra mest använda byggnadsmaterial idag. Vid framställning av fabriksbetong uppstår restbetong, som i detta arbete har delats upp i tre olika typer, returbetong, pumprester och betongslam. Returbetong avser det överskott av betong som uppstår då en kund har beställt för mycket betong. Pumprester är den sista mängden färsk betong i pumpbilars utrustning som av praktiska skäl inte kan pumpas ut. Betongslam är rester som oundvikligen fastnar på insidan av betongbilarna och fabrikens blandare som sedan måste spolas ut. I dagsläget deponeras majoriteten av landets restbetong, som med en bättre hantering skulle kunna leda till både miljömässiga fördelar och ekonomiska vinster. Syftet med examensarbetet var således att undersöka möjligheterna att återanvända restbetong i ny betong. Mer precist låg fokus i att pröva restbetongens potential som antingen ballastersättare eller cementersättare.   Examensarbetet har utförts i samarbete med Swerock AB, som är en av Sveriges största leverantörer av material och tjänster till bygg- och anläggningsbranschen. För att få en bättre inblick i ämnet besöktes Swerock:s betongfabrik i Borås, varifrån rapporten också har haft sin utgångspunkt.  Den praktiska undersökningen utfördes i ett laboratorium på högskolan i Borås. Tolv gjutförsök utfördes där restbetong prövades som antingen ballastersättare eller cementersättare. För samtliga försök uppmättes både sättmått och tryckhållfasthet, som sedan jämfördes med arbetets referensbetong, en vanligt förekommande betong på Swerock AB.  Resultaten var varierande, men visade i ett antal försök att det var möjligt att gjuta en betong som närmade sig eller var likvärdig med referensbetongen. I det stora hela konstaterades dock att fler försök skulle behöva utföras för att kunna säkerställa repeterbarheten av resultaten.  

Abstract [en]

Concrete is one of our most used building materials today. The industrial production of concrete give birth to residual concrete, which in this study has been divided into three different types, returned concrete, pump remains and concrete sludge. Returned concrete refers to the excess of concrete that is obtained when a customer has ordered too much concrete. Pump remains is the last amount of fresh concrete in the tank of the concrete mixer, which for practical reasons cannot be pumped out. Concrete sludge is a residue that inevitably sticks to the inside of the concrete mixers and therefore must be flushed out. At present, the majority of the country's residual concrete is deposited, which with better management could lead to both environmental benefits and economic gains. The aim of the thesis was accordingly, to investigate the possibilities of re-using residual concrete in new concrete. More precisely, the focus was put on testing the residual concrete's potential as a substitute for either ballast or cement.  The study has been carried out in collaboration with Swerock AB, one of Sweden's largest suppliers of materials and services for the construction industry. To extend our insight into the subject, Swerock's concrete factory in Borås was visited, from which the report also had its starting point.  The practical investigation was carried out in a laboratory at the University of Borås. Twelve different attempts to produce concrete were performed, where residual concrete was tested as a substitute for either ballast or cement. The slump and the compressive strength were measured for all the attempts, which were then compared to the reference concrete of the study, a concrete that is commonly produced at Swerock AB.  The results varied but showed in a number of attempts that it was possible to create a concrete that approached or was equivalent to the reference concrete. On the whole, however, it was found that more attempts would have to be made to ensure the repeatability of the results.  

Place, publisher, year, edition, pages
2018. , p. 20
Keywords [sv]
Återvinning, betong, restbetong
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:hb:diva-21232OAI: oai:DiVA.org:hb-21232DiVA, id: diva2:1327957
Subject / course
Byggteknik - Högskoleingenjör
Available from: 2019-06-20 Created: 2019-06-20 Last updated: 2019-06-20Bibliographically approved

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