This Master thesis is focused on characterization of multicompound self-compacting heavy-weight mortars resistant against long lasting influence of ionizing radiation in the underground nuclear waste storage. It examines a specific combination of properties of heavy-weight concretes and self-compacting mortars while considering the ecological and energetic impact of their production, as well as the productibility of partial substitutions that do not have negative impact on material properties. The Experimental part provides a comprehensive overview of composition and properties of self-compacting heavy-weight mortars with varying percentages of cement-to-mortar ratio. Sample properties were evaluated based on mechanical test results, thermal analysis, differential scanning calorimetry, scanning electron microscopy and X-ray diffraction.

Published Article / The purpose of this paper is to analyse the thermal performance of two buildings. The one has a large thermal mass and the other a highly insulated low thermal mass. A typical 120 m2 suburban building was modelled in Ecotect. As part of the model infiltration rate, wind sensitivity and a central Pretoria weather file were used. New material composites were introduced in the materials database to represent typical building materials used in the construction of heavy and light-weight buildings in South Africa. The thermal characteristics of these new materials were then calculated within Ecotect. Ecomat was used to calculate thermal lag which was used as an additional input into Ecotect. The research indicates that a low thermal mass and highly insulated building have been shown to use 18.3% less annual space heating and cooling energy when compared to the high thermal mass building. The good thermal performance results of the light-weight building will help in clearing scepticism to adopting this construction technology in southern Africa where high thermal mass masonry is still predominant.

Pastaraisiais metais Lietuvoje ženkliai padidėjęs sunkiasvorio transporto eismas sąlygoja ankstyvą daugumos šalies kelių dangų suirtį, nes jau nepakanka esamo jos stiprio. Įvairios asfaltbetonio dangos pažaidos rodo, kad ardoma ne tik danga, bet ir jos konstrukcija – tai didina išlaidas kelių remontui bei priežiūrai, mažėja eismo saugumas bei komfortiškumas. Iki šiol Lietuvoje dar nėra metodikos, kurią taikant būtų galima pakankamai tiksliai įvertinti sunkiasvorio transporto poveikį kelių dangai. Šiame darbe ištirta sunkiasvorio transporto eismo ardomojo poveikio, įvertinant Lietuvos klimato sąlygas, įtaka kelių dangos asfaltbetonio sluoksnių stipriui ir funkcionavimo trukmei. Pateikta metodika sunkiasvorio transporto eismo ir apkrovų ardančio poveikio Lietuvos kelių dangai, priklausomai nuo eismo sezoniškumo, jos stiprio, asfaltbetonio sluoksnių likutinio stiprio bei kelių dangos įtempto-deformuoto būvio kitėjimo, įvertinti. Pasiūlytas kelių dangos asfaltbetonio sluoksnių likutinio stiprio ir funkcionavimo trukmės likutinio resurso modelis. Modelis įvertina apkrovos parametrus bei jos poveikio intensyvumą, automobilių srauto sudėtį, kelių dangos sluoksnių medžiagų bei jai stiprinti naudojamų medžiagų projektines savybes, kelių dangos sluoksnio medžiagos stiprio kitėjimą, atsižvelgiant į jos suirties mastą, kelių dangos darbą, esant įvairioms vietovės klimato sąlygoms, skirtingiems žemės sankasos gruntams ir vietovės hidroterminiams rėžimams, remonto darbų kainą bei ekonominį... [toliau žr. visą tekstą] / The marked increase of heavy weight vehicle traffic in Lithuania in recent years is the reason for early deterioration of majority road pavements of the country due to inadequate strength of road pavements. Various kinds of damages in asphalt concrete pavements indicate that damage is made not only to a pavement but to its construction as well, which increases costs for road repair and maintenance and reduces road safety and comfort. There is no methodology in Lithuania that would allow to evaluate the impact of heavy weight vehicles on a road pavement with adequate preciseness. This study analyses the impact of damaging effect of heavy weight vehicle traffic on the strength and duration of service life of asphalt concrete layers in a road pavement taking account of climate conditions of Lithuania. A methodology to evaluate the damaging effect of heavy weight vehicle traffic and loads on road pavements in Lithuania depending on seasonal peculiarities of traffic, its strength, remaining strength resource of asphalt concrete layers and changes in stressed or deformed state of a road pavement is presented. A model of remaining strength of asphalt concrete layers in a road pavement and remaining resource of service life was proposed. The model evaluates load parameters and intensity of its impact, composition of vehicle flow, design characteristics of materials in layers of a road pavement and materials used when strengthening it, changes in the strength of layer material in a... [to full text]

Title: Difference in the efficiency of heavy puck and light puck training in midget male ice hockey players Objectives: The aim of this thesis is to compare the training efficiency of heavy and light puck forehand shooting in groups with different skill levels with focus on short- hand shooting, long-hand shooting and wrist-shooting in midget male ice hockey players. Methods: Intervention experiment method was used to perform this work, in which two tested groups were compared by ANOVA analysis. The significance of change was determined by Cohen's d parameter. The two tested groups consisted of 16 midget male ice hockey players of SK Černošice ice hockey club. The study consists of three measurements of shot speed, shot accuracy and handgrip strength measured before and after the first six-week training cycle and at the end of second six-week training cycle. The shooting training was performed by long swing, short swing and wrist-shot technique using heavy-weight and light-weight pucks. These pucks were used in specific shooting training drills. Results: Skill-wise technically better equipped players (starting with heavy weight puck program) reported bigger improvement in long swing, short swing and wrist- shot shot speed and accuracy after heavy-weight puck training program than after light-weight...

Det här examensarbete har genomförts i samarbete med Sweco Sverige AB på enheten för byggkonstruktion. Syftet med studien var att undersöka tungbetong som ett alternativ till konventionell konstruktionsbetong vid gjutning av vindkraftsfundament. I den här studien har ett vindkraftsfundament i konventionell konstruktionsbetong stått som grund för de dimensioneringsberäkningar som har utförts för att istället kunna använda tungbetong i fundamentet. Ett mål med studien var att med ett fundament i tungbetong minska dimensionerna och således minska klimatpåverkan och kostnaden.  För att undersöka om målet kunde uppnås har beräkningar för fundamentets geometri, krav vid bruksgränstillståndet, ekonomiska data och klimatpåverkan utförts. Från studiens dimensioneringsberäkningar om fundamentets geometri framgår det att fundamentet behöver uppfylla vissa krav på mått och därav är fundamentets radie den parameter som kan minska volymen mest. Det ledde till att volymen på fundamentet i tungbetong blev mindre än den för konventionell konstruktionsbetong.  Tungbetongens resultat blev ur vissa perspektiv bättre än konventionell konstruktionsbetong. Volymen för tungbetongsfundamentet kunde reduceras med 14 %. Detta resulterade i en minskning av koldioxidutsläpp med 7 %, priset ökade däremot med 65 %.  Genom att i detta fall använda sig av tungbetong istället för konventionell betong kunde både volym och koldioxidutsläpp reduceras, däremot till ett väldigt högt pris. / The purpose of the study was to investigate an alternative to conventional construction concrete. In this study, a wind turbine foundation consisting of conventional construction concrete have been analysed and served as a basis for dimension calculations to the foundation of heavy weight concrete.  A goal with the study was to decrease the dimensions of the foundation using heavy weight concrete instead of conventional and therefore also reduce the climate impact as well as the cost of the foundation.  To investigate if the goal is achievable, calculations for the foundation geometry, the requirement of the service limit state, economic data and climate impact have been calculated. In the calculations about the foundation geometry, certain requirements regarding the dimensions needs to be achieved and therefore it is the radius of the foundations that can affect the volume the most. This resulted in a decrease of volume for the heavy weight concrete foundation.  In some perspectives, the heavy weight concrete had better outcome than conventional construction concrete. The volume of the foundation could be reduced by 14 %. This led to a reduction in product emission by 7 %. The price of heavy weight concrete, per cubic meter, is almost five times more expensive than it is for conventional construction concrete and therefore the price was 65 % higher.  This concludes in a possibility to reduce both the volume as well as the CO2-emissions but for a very high price.