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Koldioxidupptag i betong: Accelererade laboratorieförsök
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Concrete Structures.
2016 (Swedish)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

Concrete absorbs carbon dioxide from air by a process called carbonation. The process takes a long time to get substantial results in natural conditions. Because of this an accelerated carbonation method is used. During accelerated carbonation the level of carbon dioxide is much higher than in natural air. The relationship between natural and accelerated carbonation is however not completely confirmed. In this report a first attempt at calibrating a newly constructed accelerator and method for determining carbon dioxide uptake is examined. An investigation on the effect of fly ash on carbonation is also performed.

The new method consists of a whole piece of carbonated concrete which is crushed down and analyzed with Thermogravimetric Analysis (TGA) to get the carbon dioxide uptake. It could be determined that the theory concerning the influence of fly ash on the speed of carbonation was consistent with the results, but not on the carbonation uptake. Concerning the new method and the relationship between natural and accelerated carbonation there is a need for further tests before anything can be concluded. Potential sources of errors could be determined, however, and improvements of the method were identified.   

Abstract [sv]

Betong tar upp koldioxid ur luften genom en process kallad karbonatisering. Processen tar lång tid för att få tydliga resultat vid naturliga förhållanden.  Därför används accelererande försök där halten koldioxid är mycket högre än i naturlig luft, dock är relationen mellan naturlig och accelererad karbonatisering ej helt fastställd. I denna rapport analyserades ett första försök på kalibrering för en nykonstruerad accelerator och undersökningsmetod för bestämning utav koldioxidupptag samt en undersökning om hur mängden flygaska påverkar karbonatiseringen.

Den nya metoden är att en hel bit av karbonatiserad betong krossas ner och behandlas i termogravimetrisk analys (TGA) för att få fram koldioxidupptaget. Det kunde konstateras att teorin angående inverkan utav flygaska på karbonatiseringshastigheten stämde bra överens med resultaten men ej för koldioxidupptaget. Angående den nya metoden och förhållandet mellan naturlig och accelererad karbonatisering behövs mer tester utföras innan något kan bestämmas definitivt. Dock kunde viktiga potentiella felkällor och förbättringar identifieras.

Place, publisher, year, edition, pages
TRITA-BKN-Examensarbete, ISSN 1103-4297 ; 497
Keyword [sv]
accelererad karbonatisering, betong, flygaska, kolioxidupptag
National Category
Building Technologies
URN: urn:nbn:se:kth:diva-191493ISRN: KTH/BKN/EX--497--SEOAI: diva2:957543
External cooperation
CBI Betonginstitutet
Subject / course
Concrete Structures; Concrete Structures
Educational program
Degree of Master - Civil and Architectural Engineering; Master of Science in Engineering - Urban Management
Available from: 2016-09-09 Created: 2016-08-31 Last updated: 2016-09-09Bibliographically approved

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