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Tryckhållfasthet för resurssnål betong: Utvärdering i tävling av högsta tryckhållfasthet för resurssnål betong
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
KTH, School of Architecture and the Built Environment (ABE), Civil and Architectural Engineering, Building Technology and Design.
2012 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Compressive strength of resource economic concrete : Evaluation of competition in highest compressive strength of resource economic concrete (English)
Abstract [sv]

Betong är vårt vanligaste byggmaterial men cement står globalt sett för 5 % av CO2-emissionerna. Med detta som bakgrund så har CBI Betonginstitutet anordnat en tävling, där målet är att nå den högsta tryckhållfasthet i en resurssnål betong, med enbart 200 kg cement per m3. Syftet med denna rapport är att utvärdera tävlingen, vilket har utförts genom en omfattande litteraturstudie. 

En första analys av de olika betongrecepten medförde att olika grupperingar kunde urskiljas. Ur dessa fanns det tre stycken vars resultat var väldigt bra. 

 Concrete Innovation Centre, som med ett lågt vct, stora mängder granulerad masugnsslagg (81 %) och lite silikastoft (5 %), uppnådde en tryckhållfasthet på 80 MPa vid 28 dygn och 95 MPa vid 56 dygn. 

 CBI Stockholm, som genom användandet av ulltrafint filler och silikastoft (4,8 %), uppnådde en tryckhållfasthet på 84 MPa vid 28 dygn och 98 MPa vid 56 dygn. 

 Thomas Concrete Group som genom att ersätta cementet med en medelmåttig mängd granulerad masugnsslagg (54 %), liten mängd flygaska (9 %), kalkfiller och silikastoft (5 %), uppnådde en tryckhållfasthet på 94 MPa vid 28 dygn och 98 MPa vid 56 dygn. 

Det finns således tre recept som vidare studier kan vara rättfärdigade på, de tre ovan nämnda. Det bör tilläggas att en imponerande tryckhållfasthet på nästan 100 MPa, kan uppnås i en betong med enbart 200 kg cement per m3. 

Abstract [en]

Concrete is the most frequently used construction material, but cement globally stands for 5 % of the world’s CO2 emissions. With this as a background CBI Betonginstitutet has arranged a competition, where the goal is to reach the highest compressive strength in a resource economic concrete, with only 200 kg cement per m3. The purpose of this report is to evaluate the competition, which has been done via a substantial literature study. 

A first analysis of the different concrete recipes resulted in that different groups could be identified. From these there were three recipes whose result was very good. 

 Concrete Innovation Centre, which with a low w/c, a high amount of ground granulated blast furnace slag (81 %) and little silica fume (5 %), reached a compressive strength of 80 MPa at 28 days and 95 MPa at 56 days. 

 CBI Stockholm, which by the usage of ultrafine filler and silica fume (4,8 %), reached a compressive strength of 84 MPa at 28 days and 98 MPa at 56 days. 

 Thomas Concrete Group, which by replacing the cement with a moderate amount of ground granulated blast furnace slag (54 %), a small amount of fly ash (9 %), lime filler and silica fume (5 %), reached a compressive strength of 94 MPa at 28 days and 98 MPa at 56 days. 

The conclusion is that there are three recipes that further studies are justified to continue with, the three mentioned above. It should be added that an impressive concrete compressive strength of almost 100 MPa, can be reach with the use of only 200 kg cement per m3. 

Place, publisher, year, edition, pages
2012. , 46 p.
Keyword [en]
Evaluation of competition, Compressive strength, Resource economic concrete, CBI Betonginstitutet, Ground granulated blast furnace slag, Ultrafine filler, Fly ash, Silica fume.
Keyword [sv]
Utvärdering av tävling, Tryckhållfasthet, Resurssnål betong, CBI Betonginstitutet, Granulerad masugnsslagg, Ultrafint filler, Flygaska, Silikastoft.
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-102107OAI: oai:DiVA.org:kth-102107DiVA: diva2:550923
External cooperation
CBI Betonginstitutet
Subject / course
Constructional Engineering and Design
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Uppsok
Technology
Supervisors
Examiners
Available from: 2012-09-10 Created: 2012-09-09 Last updated: 2013-03-07Bibliographically approved

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