diplomska naloga
Matija Zajec (Author), Drago Saje (Mentor), Dušan Žagar (Thesis defence commission member), Janko Logar (Thesis defence commission member)

Abstract

V diplomskem delu obravnavamo analizo krčenja betona visoke trdnosti, ki je mikroarmiran s polipropilenskimi vlakni. Uporabili smo štiri različne dolžine polipropilenskih vlaken, in sicer dolžine 6 mm, 12 mm, 18 mm in 30 mm. Delež vlaken je pri vsaki betonski mešanici 0.5 % njene prostornine. Pri betonih visoke trdnosti je v prvih dneh po betoniranju zelo intenzivno avtogeno krčenje, zato smo prvi dan merili avtogeno krčenje elektronsko, s pomočjo merilnih uric. V nadaljevanju smo krčenje merili z nasadnim deformetrom. Avtogeno krčenje smo merili na zatesnjenih preskušancih, na ostalih, nezatesnjenih preskušancih, pa smo merili celotno krčenje betona visoke trdnosti. Analizirali smo tudi krčenje betona zaradi sušenja, ki predstavlja razliko med celotnim in avtogenim krčenjem betona. V analizi smo med seboj primerjali krčenje 1, 3, 7 in 28 dni starega betona. Dodatno smo preizkusili še tekoči dodatek proti krčenju Eclipse Plus, ki deluje na principu zmanjšanja površinske napetosti v kapilarnih porah. V okviru izvedenih eksperimentalnih raziskav smo ugotovili, da polipropilenska vlakna relativno malo pripomorejo k zmanjšanju krčenja betonov visoke trdnosti. Kot najbolj učinkovita so se, predvsem pri zgodnjem avtogenem krčenju, izkazala kratka polipropilenska vlakna, dolžine 6 mm.

Keywords

gradbeništvo;diplomska dela;UNI;krčenje;polipropilenska vlakna;beton visoke trdnosti;avtogeno krčenje;

Data

Language: Slovenian
Year of publishing:
Typology: 2.11 - Undergraduate Thesis
Organization: UL FGG - Faculty of Civil and Geodetic Engineering
Publisher: [M. Zajec]
UDC: 624.012.45:691.32(043.2)
COBISS: 5808993 Link will open in a new window
Views: 2170
Downloads: 479
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Other data

Secondary language: English
Secondary title: Shrinkage of polypropylene fibre reinforced high strength concrete
Secondary abstract: In this diploma paper we deal with the analysis of high strength concrete, micro-reinforced with polypropylene fibers. We used four different lengths of polypropylene fibers: 6mm, 12 mm, 18 mm and 30 mm. The share of fibers in each concrete mixture is 0.5 % of the total volume. With high strength concretes autogenous shrinkage is very intensive, so the first day we measured it electronically with dial gauges. Later we measured the shrinking with a mobile displacement transducer. We measured autogenous shrinkage on sealed samples, and on the unsealed samples we measured the total shrinkage of high strength concrete. We also analysed shrinkage of the concrete due to drying, which represents the difference between total and autogenous concrete shrinkage. In the analysis we compared concrete shrinkage of 1-, 3-, 7- and 28-day-old concretes. In addition we tested the liquid shrinkage reducing admixture Eclipse Plus which works by reducing surface tension in capillary pores. Through experimental researches we discovered that polypropylene fibers do not contribute much to reducing high strength concrete shrinkage. The most efficient were, especially in the early stages of autogenous shrinkage, short polypropylene fibers (6mm).
Secondary keywords: graduation thesis;civil engineering;shrinkage;polypropylene fibres;high strength concrete;autogenous shrinkag;
File type: application/pdf
Type (COBISS): Undergraduate thesis
Thesis comment: Univ. v Ljubljani, Fak. za gradbeništvo in geodezijo
Pages: IX, 77 str.
ID: 8726226