Sprijemnost med vlaknastim betonom in armaturo : diplomska naloga

Juvanec, Blaž (author), Saje, Drago (mentor)

Diplomsko delo obsega preiskave na področju sprijemnih napetosti med visokotrdnim vlaknastim betonom in armaturo. Za potrebe preiskave smo zasnovali izvlečni test armaturne palice iz betona po navodilih, ki jih podaja standard SIST EN 10080:2005 v dodatku D. Držali smo se navodil za izdelavo preizkušancev ter samega poteka preizkusa. V lesenem kalupu smo izdelali kocke z robom 20 cm, ki smo jim skozi sredino vgradili armaturno palico s premerom 12 mm. 28 dni po betoniranju smo palico s pomočjo preizkuševalne naprave izvlekli iz betona, sproti pa smo beležili rezultate. Sprijemno napetost smo določili kot strižno napetost, ki deluje na obodu armaturne palice sidrane v betonu. Preizkusili smo tri različne mešanice visokotrdnega betona z različnim prostorninskim deležem jeklenih ali polipropilenskih vlaken. Za vsako mešanico smo izdelali po tri preizkušance. Eksperimentalni rezultati raziskave so pokazali, da vsebnost vlaken v betonu povečuje sprijemno trdnost med betonom in armaturo.

• Language: Slovenian
• Keywords: gradbeništvo, diplomska naloga, VSŠ, sprijemna napetost, vlaknasti beton, visokotrden beton, izvlečni test
• Work type: Bachelor thesis/paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FGG - Faculty of Civil and Geodetic Engineering
• Place of publishing: Ljubljana
• Publisher: [B. Juvanec]
• Year: 2015
• Number of pages: X, 52 str.
• PID: 20.500.12556/RUL-73029
• COBISS.SI-ID: 7255905
• Publication date in RUL: 07.10.2015

Secondary language

• Language: English
• Title: Bond between fibre reinforced concrete and reinforcing bars

Abstract

The following thesis covers the researches on bonds between fibre reinforced high strength concrete and reinforcing bars. For the purpose of research we had conceived a pull-out test specified on directions in standard SIST EN 10080:2005 in annex D. This standard defines how the specimens and the test are conducted. In a wooden mold we made a cube-shaped concrete specimens with an edge of 20 cm and a rebar with a diameter of 12 mm embedded through the middle. After 28 days the pull-out tests were carried out on hardened concrete specimens using a special testing machine. The bond stress was determined as the stress acting on the circumference of a reinforcing bar. We tested three different types of highstrength concrete which were made with different proportion of steel and polypropylene fibres. Three specimens were made for each type of concrete. The experimental results showed that the fibre reinforcment significantly increased the bond strength between concrete and reinforcement bars.

• Keywords: bond stress, fibre reinforced concrete, high strength concrete, pull-out test