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The Global ETD Search service is a free service for researchers
to find electronic theses and dissertations. This service is
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Networked Digital Library of Theses and Dissertations.
Our metadata is collected from universities around the world. If you manage a university/consortium/country archive and want to be added, details can be found on the NDLTD website.
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Showing 1 to 3 of 3 (0.027 seconds)Spelling suggestions: "subject:"bergsskolan"" "subject:"bergsskolans""
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Temperaturförändring under och efter etappkylningsprocessenAndersson, Helena, Adolfsson, Nathalie January 2020 (has links)
No description available.
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Energier och CO2, fördelning i flödet vid mobil krossningGustafsson, Markus January 2019 (has links)
På grund av nya lagar och företagets egna initiativ om uppföljning av energier och utsläpp har NCC påbörjat kartläggning av dessa faktorer i bergtäkter. För deras bergtäkter av mindre storlek har de önskat framställa en metod med vilken platscheferna själva ska kunna utföra detta arbete. Detta har föranlett till den undersökning som redovisas i denna rapport. Målet med arbetet var att undersöka hur mycket information som finns tillgänglig om energier vid Eker bergtäkt. Sedan ska den informationen användas för att utveckla en metod som förenklar arbetet för platschefer på mindre bergtäkter samt att kartlägga energi och koldioxidutsläpp per ton vid Eker under produktionsåret 2018. I slutändan skapades en excel-fil som beräknar och fördelar energier och utsläpp om information om förbrukat bränsle och el tas fram och matas in. Nyckeltalen som beräknades för energier var 10,03 kWh/ton för totalen, 4,82 kWh/ton för produkter efter krossteg 1, 7,74 för produkter efter krossteg 2 och 14,25 kWh/ton för produkter efter krossteg 3. Nyckeltalen för koldioxid var 2,39 kg CO2/ton för totalen, 1,05 kg CO2/ton för produkter efter krossteg 1, 1,80 för produkter efter krossteg 2 och 3,49 kg CO2/ton för produkter efter krossteg 3. Resultaten visar på att det går att utföra denna typ av undersökningar med den framtagna metoden. Undersökningen avgränsades vid det förberedande arbete med losshållning av berg fram tills lastning på kunds lastbil. Endast de större påverkande faktorerna diesel och el undersöktes. / Due to new laws and the company’s own initiative concerning tracking of energies and emissions in quarries, NCC has begun surveying these factors. For their smaller quarries they mean to produce a method for local site managers, with which they themselves can perform this task. Because of these reasons the study in this rapport has been done. The end goal was to study the amount of available informtion about the energies at Eker quarry. Then Using this information to create a method for site managers to simplify their work as well as performing a survey in Eker concerning energies and emissions per ton of produced materials during 2018. The end product was an excel-file that calculates och distributes energies and emissions as long as data about used diesel and electricity is entered into the file. The survey produced the key figures for energies, 10,03 kWh/ton for the total 4,82 kWh/ton for products after the first crusher stage, 7,74 for products after the second and 14,25 kWh/ton for products after the third crusher stage. The key figures for emissions are 2,39 kg CO2/ton for the total, 1,05 kg CO2/ton for products after the first crusher stage, 1,80 for products after the second and 3,49 kg CO2/ton for products after the third crusher stage. The results show the possibilities to perform this type of survey with the produced method. The survey’s limitations were at the preliminary work with salvoes and ended when the product was loaded to a customer. Only the major factors of diesel and electricity was studied.
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Samband mellan geologiska och bergmekaniska egenskaper i bergmaterial som bärlager till riksväg 51 : Riksväg 51 sträckan Svennevad - KvarntorpskorsetLandeman, Philip January 2018 (has links)
This thesis was created to ensure the quality of the rock which would be crushed to base layer construction material, in a road cut at Swedish highway 51, and to find a possible link between the rock's abrasion resistance and its mineralogy. Rock samples were collected, and among other things, several ball mill tests were carried out. The design of the road project was carried out by Loxia Group AB with NCC Group as contractor.A total of 18 rock samples and 2 base layer samples were taken in the area and they were all tested in a ball mill. The results showed that of the 18 rock samples, 2 samples had a ball mill value of less than 16 on the scale, 10 samples had values from 16 to 20, in addition to this, 3 samples had values from 20 to 21 and 3 samples had values in excess of 21 on the Swedish ball mill scale.Of the 3 samples with a ball mill value higher than 21, all contained a larger amount of biotite. Biotite did not appear to the same extent among the samples that ended up further down the ball mill scale. This link was so clear that a conclusion was subsequently drawn from this. The samples taken on the prefabricated base layer both had a ball mill value between 16 and 20. Overall, both the base layer and the rock material passed the Swedish Government’s Transport Administration’s requirements according to "TRVKB 10, Obundna lager". The rock type that was on the south part of the rock cut, adjacent to a deformation zone, had way too poor quality to undergo a ball mill test and therefore there are no values taken from that area.The conclusion of the work is that the rock material overall meets the Swedish Government’s Transport Administration’s requirements for base layer construction materials according to "TRVKB 10 Obundna lager", that a clear link between the proportion of biotite in a rock material and its abrasion resistance exists, and that the broken rock in the south should not be used as construction materials since the rock has insufficient mechanic capacity.
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