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Določitev optimalne adiabatne krivulje za masivne betone na HE Brežice
ID Žnidaršič, Špela (Author), ID Kryžanowski, Andrej (Mentor) More about this mentor... This link opens in a new window, ID Trtnik, Gregor (Co-mentor)

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Abstract
V okviru izdelave tega magistrskega dela obravnavam potek adiabatne krivulje za masivne betone na HE Brežice. Za podrobnejšo analizo je bilo potrebno poznati obnašanje in vpliv posameznih sestavih betona na razvoj temperature v betonu. Za potrebe analize smo na gradbišču HE Brežice od avgusta do decembra 2015 izvajali meritve temperatur treh različnih receptur betona. Kot primerjalno recepturo smo vzeli obstoječo recepturo betona, ki jo trenutno uporabljajo za gradnjo HE Brežice, glede na to recepturo pa smo določili še dve, katere namen je bil zmanjšati maksimalne temperature v procesu hidratacije. Prva modificirana mešanica je imela zelo majhno količino cementa, vendar smo že v fazi načrtovanja recepture predvidevali, da bi takšna mešanica lahko predstavljala velik problem pri vgradnji, zato smo v nadaljevanju sestavili še recepturo za drugo korigirano mešanico. Ta je sicer vsebovala manjšo količino cementa kot primerjalna mešanica, a večjo kot prva korigirana mešanica. Na račun zmanjšanja količine cementa smo v tej mešanici povečali količino finih delcev, da bi obdržali čim boljšo vgradljivost betona. Po podrobnejši analizi podatkov, ki smo jih pridobili s pomočjo poskusov, sem ugotovila, da zmanjšanje količine cementa v betonu zelo ugodno vpliva na adiabatno krivuljo. Mešanica z najmanjšo količino cementa je dosegla najmanjšo absolutno temperaturo, najmanjši dvig temperature in najmanjši relativni dvig temperature. Ta mešanica je dosegala tudi najmanjše hitrosti in pospeške povečevanja priraščanja temperature v betonu.

Language:Slovenian
Keywords:masivni beton, adiabatna kalorimetrija, visoke temperature v betonu, hidroelektrarna, razpoke, cement
Work type:Master's thesis/paper (mb22)
Typology:2.09 - Master's Thesis
Organization:FGG - Faculty of Civil and Geodetic Engineering
Year:2016
Publisher:[Š. Žnidaršič]
Place:Ljubljana
UDC:621.311.21:624.012.4(043)
COBISS.SI-ID:7523169 This link opens in a new window
Publication date in RUL:20.07.2016
Views:1551
Downloads:459
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Secondary language

Language:English
Title:Determination of the optimum Adiabatic Curve for Mass concrete at the Brežice HPP
Abstract:
In the scope of this master's thesis we determined the adiabatic curve of massive concrete used in construction of Hydro power plant Brežice. Behavioral understanding of specific concrete components and their influences on development of temperature during concrete drying process was crucial for detailed analysis. For analysis purposes of temperature development in concrete drying process three different mixtures were used and measured during construction of HPP Brežice between August and December 2015. The mixture currently used for installation represented a reference for two other modified mixtures which we introduced with the purpose of minimizing the maximum temperature of hydration process. The first modified mixture contained a low percentage of cement. In the planning phase we assumed that installation of this mixture could represent a major problem, so we compiled a recipe for another adjusted mixture. This mixture contained a smaller amount of cement then the reference, but still higher then the first modified version. On the expense of reducing the quantity of cement we increased the number of fine particles to maintain best possible workability of concrete. After a detailed analysis of the data we obtained through experiments, we have found that reducing the amount of cement in concrete mixture has positive influence on the adiabatic curve. Blend with the minimum amount of cement has reached the minimum absolute temperature, minimum temperature rise and minimum relative temperature rise. This mixture has reached the minimum speed and accelerations of the temperature increase inside the concrete.

Keywords:mass concrete, adiabatic calorimetry, high concrete temperatures, Hydropower Plant, cracks, cement

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