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Miljøvennlig betong

Lindstrøm, Kato Ø.; Pedersen, Vegard Nornes; Øksnevad, Snorre Braut
Bachelor thesis
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URI
https://hdl.handle.net/11250/2774347
Date
2021
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Abstract
Bacheloroppgaven vår er delt inn i 3 deler. Første del av oppgaven er en teoridel hvor vi tar

for oss hva betong er for å gi et bedre grunnlag til å forstå konklusjoner og valg senere i

oppgaven.

I del to har vi utført lab forsøk hvor vi har støpt totalt 24 terninger med to forskjellige

resepter. I den ene resepten bruker vi lavvarmesement med rundt 70% slagg, mens vi i den

andre resepten bruker vanlig anleggssement. Begge reseptene har samme fasthetsklasse og

bestandighetsklasse ettersom vi skulle sammenligne dem i en” case” i del 3 av oppgaven. Fra

resultatene kunne vi se at lavvarmebetongen hadde litt større flyt enn anleggsbetongen og at

tidligfastheten på lavvarmen også var lavere enn anleggsbetongen, men jo nærmere vi kom

dag 28 jo likere ble de to reseptene på fasthet.

I den siste delen har vi lagd en” case” hvor et parkeringshus skal bli støpt, og ser på hvilke

konsekvenser eller forskjeller man ville fått om man støpte det i lavvarme betong kontra

vanlig anleggs betong. Vi så at prisen per kubikk var gjennomsnittlig 50 kr dyrere for

lavvarmesementen, noe som ga et prisutslag på 190 000 kroner for vårt prosjekt, og i tillegg

krever lavvarmen mer utstyr og en strengere dokumentasjon, samt at fremdriften vil bli noe

forsinket grunnet en tregere herdetid. Det positive vi fant ut var at ved å velge

lavvarmebetongen så reduseres CO2-utslippet med det tilsvarende årlige utslippet til 100

nordmenn.

Foreløpig er prisen på miljøbetong litt dyrere, men i løpet av fremtiden vil miljøbetong bli

mer tilgjengelig og dermed billigere. Samtidig vil det komme strengere miljøkrav til

produksjon og bruk av betong og vi tror derfor at miljøbetong vil bli viktig, og mye brukt

fremover.
 
Our bachelor thesis is divided into three parts. The first part of the thesis is a theoretical part where we look into what concrete is to provide a better basis for understanding the conclusions and choices later in

the task.

In part two, we have performed lab experiments where we have cast a total of 24 dices with two different

recipes. In one recipe, we used a low-heat cement with around 70% slag, while the second recipe uses ordinary construction cement. Both recipes have the same strength class and

durability class as we were to compare them in a "case" in part 3 of the thesis. From

the results we could see that the low heat concrete had a slightly greater flow than the construction concrete and that the early strength of the low heat concrete was also lower than the construction concrete, but the closer we got day 28 the more similar the two recipes were for firmness.

In the last part we made a "case" where a parking garage will be cast, and we were looking at which consequences or differences one would get if we cast it in low heat concrete versus

ordinary construction concrete. We saw that the price per cubic meter was on average NOK 50 more expensive

the low-heat cement, which resulted in a price impact of NOK 190,000 for our project, and in addition

the low heat requires more equipment and stricter documentation, and that progress will be somewhat

delayed due to a slower curing time. The positive thing we found out was that by choosing

the low-temperature concrete, the CO2 emissions are reduced by the corresponding annual emissions to 100

Norwegians.

Currently, the price of environmental concrete is a little more expensive, but in the future, environmental concrete will be more accessible and thus cheaper. At the same time, there will be stricter environmental requirements regarding production and use of concrete and we therefore believe that environmental concrete will be important and widely used in the future.
 
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