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Utvärdering av kalciumnitrat som bindetidsaccelerator
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.
2013 (Swedish)Independent thesis Basic level (university diploma), 10 credits / 15 HE creditsStudent thesisAlternative title
Evaluation of calciumnitrate as setting time accelerator (English)
Abstract [sv]

Man vill förkorta betongs bindetid dvs. den tid då betongytan kan behandlas så att betongytan blir slät efter gjutning. Det är en stor utmaning för företag som tillverkar fabriksbetong vintertid, eftersom bindetiden förlängs ju kallare klimatet är.

Syftet med denna labboration var att visa hur Kalciumnitrart fungerar som bindetidsaccelerator i betong, och om Kalciumnitrart påverkar betongens fysikaliska egenskaper.  Följande faktorer har studerats för att se hur dessa faktorer påverkar betongens bindetid i kombination med användning av Kalciumnitrat.

  1. Betongens utgångstemperartur
  2. Typ av flyttillsatsmedel i betongen
  3. Betongens utgångskonsistens
  4. Betongens lagringsklimat

Även hitta rätt dosering för att denna produkt ska vara lönsamt att användas i praktiken.

Alla underökningar har utförts hos Sika AB laboratorium. All data har noggrant undersökts och använts i Excel program för framtagning av tabeller och diagram.

Resultaten/slutsats i underökningarna visade följande.

  1. Bindetiden kan förkortas med Kalciumnitrat utan att behöva riskera betongens fysikaliska egenskaper. Enligt bindetidsdiagram noterades att 2,0 % och 2,5 % doseringarna gav bästa resultat gällande bindetid dvs. de gav kortast bindetid. Observera att +5 graders lagringsklimat gav ologiska resultat dvs. referensbetongen utan acceleratorn gav kortast bindetid.
  2. Tryckhållfastheten påverkas inte av acceleratorn dvs. man kan använda denna produkt utan att riskera betongens bärförmåga.
  3. Resultaten visade att betongens utgångskonsistens har stor betydelse för bindetiden, ju högre konsistens värde desto längre bindetid.
  4. Även betongens utgångstemperatur har påverkan på bindetiden, ju högre betongtemperatur desto kortare bindetid.
Abstract [en]

You want to reduce the concrete’s initial setting i.e.  the time the concrete surface can be treated so that surface gets plane after molding. It’s a big challenge for the companies that produce mill concrete in winter. Since the colder the climate gets the binding process will be extended. The purpose of this lab was to show how Calcium Nitrate functions as bonding time accelerator in concrete and if Calcium Nitrate affects the physical features of the concrete. The following elements have been studied to see how these elements affect the initial setting of the concrete in combination with the use of Calcium Nitrate.

  1. The initial temperature of the concrete
  2. The type of super plasticizer in the concrete
  3. The initial consistency
  4. Concrete storage climate

Even finding the right dose so that this product will be profitable to use in the practice.

All investigations have been made at Sika AB laboratory. All the data have been investigated and used in excel program for the product of chart and diagram.

The results of the investigations showed the following:

 

  1. Bond time can be reduced with Calcium Nitrate without needing to risk the physical features of the concrete.  According to bonding time diagram it was noted that 2.0 % and 2.5% doses gave the best result valid the initial setting i.e. that gave the shortest time of initial setting, Observe that +5 degrees storage climate gave illogical results i.e. reference concrete without the accelerator gave the shortest initial setting.
  2. Compressive strength does not get affected by the accelerator i.e. you can use this product without risking the concretes carrying capacity. 
  3. The results showed that the concrete initial consistency has a big importance to bond time, the higher consistency value the longer time of initial setting.
  4. Even concrete initial temperature has influence on the bond time, the higher concrete temperature, the shorter time of initial setting.
Place, publisher, year, edition, pages
2013.
Keyword [en]
calciumnitrate, setting time, accelerator, dosage, dope, compressive strength
Keyword [sv]
kalciumnitrat, bindetid, accelerator, dosering, tillsatsmedel, tryckhållfasthet
National Category
Civil Engineering
Identifiers
URN: urn:nbn:se:kth:diva-121971OAI: oai:DiVA.org:kth-121971DiVA: diva2:619770
External cooperation
Sika AB
Educational program
Bachelor of Science in Engineering - Constructional Engineering and Design
Uppsok
Technology
Supervisors
Examiners
Available from: 2013-05-06 Created: 2013-05-06 Last updated: 2013-05-06Bibliographically approved

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