In connection with the property crises in many countries, caused by the financial crises, people are now more aware of the risks involved in poor property-investments. The unusually cold winters along with extreme prices of electricity in Sweden in recent years has also contributed to increased interest in energy-efficient buildings. The process of developing a modern family home in Kiruna, Sweden is presented the first part of this paper. The house has been designed to withstand very high stresses from snow, low energy consumption as well as a high standard of living comfort. Aspects of the house covered here involves everything from construction, heating and ventilation to sanitation. Each of these areas is presented based on their underlying, scientific methods or theories. The purpose of this approach is to enable that the results presented here can be used as reference in other housing projects. Non-standard solutions for some of the areas are used in the development of this house. One example of this is the use of Masonite beams, which proved to be very useful in the roofs and floor structure between the two levels of the house. The beams simplify access for ventilation pipes and waste water pipes, as well as the use of thick isolation. They also enable large spans. The second part of this paper involves small wind turbines designed not to require permission from the authorities. The wind conditions as well as the choice of a suitable wind turbine are investigated from a scientific and economic stand point. The results concluded that a vertical axis wind turbine is the better choice considering the limitations of rotor diameter along with the lower wind speeds in Kiruna. The final choice was a vertical axis wind turbine with 4 kW rated power. The yearly production of electricity is estimated to 4000 kWh, which was not enough to generate profit. In the last part the possibility of using a filtration system for electricity prices in the future is investigated. This is based on the developed house’s energy performance and the wind turbine’s production. The assumptions made is that the wind turbine is equipped with a large battery and that private individuals have access to the same kind of debiting system that companies in Sweden have today. The model used in this simulation is self-made and enables variable energy consumption for the house as well as variable energy production for the wind turbine to give a truthful representation of the variations which occur naturally during a year. The results concluded that there are profits to be made in the range of 10 % of the value of the wind turbine’s yearly production.

Concrete is one of the world's most widely used building materials,but due to the high carbon dioxide emissions produced by the concretecomponent Portland cement, there is a growing need of alternativeconcrete recipes that require less portland cement. When you replace aportion of the Portland cement in the concrete recipe with an additivematerial such as granulated blast furnace slag, the carbon dioxideemissions decrease, but the strength growth becomes slower. Inconcrete casting, there are currently several working methods foraccelerating strength growth and the purpose of this work is toinvestigate the effect that various hardening accelerating measureshave on slag-based concrete. The work is limited to studying buildingproduction and focuses on the structural parts concrete slabs, wallsand filigree slabs. The study was carried out in collaboration withSkanska AB.To investigate the effect of different hardening accelerating measureson slag-based concrete, concrete casting simulations are compared inthe software Produktionsplanering Betong (PPB). The measures that arestudied in different variations are heating coils, external heating,insulation and elevated casting temperature. A total of 114simulations are planned, which include variations of the investigatedmeasures, outdoor temperature and design geometry. A survey is alsoconducted with the purpose to assess how hardening acceleratingmeasures are applied in swedish building production today. The surveyis spread with a geographical spread to five of the largesthouseproducing construction groups in Sweden. The result of thesimulations performed is that the measure heating loops has achievedthe best result where its effect has been optimized for eachindividual case. The results indicate that heating coils, incombination with insulation, are an effective measure. At the sametime, the survey shows that there is annoyance with the methods thathave proven effective in the simulations performed. Although it is notpossible to draw a conclusion about a universal solution to compensatefor the slower hardening time of the slag concrete, the results stillindicate that today's construction industry has good conditions for atransition to a more environmentally friendly concrete. / Betong är ett av världens mest använda byggmaterial, men på grund av den stora haltkoldioxidemissioner betongkomponenten cement producerar så finns ett ökandebehov att tillämpa betongrecept som kräver mindre cement. Då man ersätter en andelav portlandcementet i betongreceptet med ett alternativt tillsatsmaterial somgranulerad masugnsslagg, minskar koldioxidemissionerna, men hållfasthetstillväxtenblir långsammare. Vid betonggjutning finns i dag flera arbetsmetoder för att påskyndahållfasthetstillväxten och syftet med detta arbete är att undersöka vilken effekt dessaolika härdningspåskyndande åtgärder har på slaggbaserad betong, även kalladslaggbetong. Arbetet begränsas till att studera husproduktion och fokuserar påkonstruktionsdelarna platta på mark, väggelement och filigranbjälklag. Studien ärutförd i samarbete med Skanska Sverige AB.För att undersöka vilken effekt olika härdningspåskyndande åtgärder har påslaggbetong jämförs betonggjutningssimuleringar i programvaranProduktionsplanering Betong, (PPB). Slaggbetongen som undersöks är Skanska GrönBetong, och åtgärderna som huvudsakligen studeras är olika variationer avvärmeslingor, extern uppvärmning, isolering och höjd gjutningstemperatur. 114stycken simuleringar planeras totalt, vilka inkluderar variationer av de undersöktaåtgärderna, uteluftstemperatur och konstruktionsgeometri. En enkätundersökningutförs även med syfte att bedöma hur härdningspåskyndande åtgärder tillämpas isvensk husproduktion idag. Enkäten sprids med en geografisk spridning till fem avde största husproducerande byggkoncernerna i Sverige. Resultatet av de utfördasimuleringarna är att åtgärden värmeslingor uppnått bäst resultat där dess effekt varitoptimerad för varje enskilt fall. Resultatet tyder på att värmeslingor i kombinationmed isolering, är en effektiv åtgärd. Samtidigt visar enkätundersökningen att det finnserfarenhet av de metoder som visat sig effektiva i de simuleringar som utförts. Trotsatt det ej går att dra en slutsats om en allmängiltig lösning för att kompensera förslaggbetongens långsammare härdningstid, tyder ändock resultatet på att dagensbyggindustri har goda förutsättningar för en övergång till en miljövänligare betong.