Utjecaj visokih temperatura na mehanička svojstva betona s pepelom iz drvene biomase

undergraduate thesis

• Title (english): Effect of high temperatures on the mechanical properties of concrete with wood biomass ash
• Author: Alexandar Janković
• Mentor: Marija Jelčić Rukavina (mentor)
• Committee member: Ivan Gabrijel (predsjednik povjerenstva)
• Committee member: Marija Jelčić Rukavina (član povjerenstva)
• Committee member: Nina Štirmer (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Materials); Zagreb
• Defense date and country: 2020-09-22, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract

Cilj eksperimentalnog istraživanja, prikazanog u ovom radu, je istražiti utjecaj visokih temperatura na mehanička svojstva betona s pepelom iz drvene biomase. Za potrebe istraživanja napravljene su četiri mješavine: jedna referentna mješavina te mješavine u kojima je portland cement zamijenjen s različitim udjelima pepela (10-20 %). Ispitana su svježa svojstva (gustoća, konzistencija i udio pora) i 28-dnevna tlačna čvrstoća. Nakon izlaganja visokim temperaturama (do 600 °C) u starosti od 90 dana, ispitana su mehanička (tlačna čvrstoća i modul elastičnosti) i fizikalna (masa i UPV) svojstava. Rezultati ispitivanja su pokazali da se povećanjem udjela pepela smanjuje konzistencija i tlačna čvrstoća do 13 %. Nadalje, zamjenom portland cementa pepelom drvene biomase u udjelu do 20%, ne dolazi do dodatne degradacije mehaničkih i fizikalnih svojstva nakon djelovanja visokih požarnih temperatura. Naprotiv, u usporedbi s referentnom mješavinom, u temperaturnom području između 400 i 600°C, dolazi do blagog porasta (do 11%) preostalih mehaničkih svojstava, te manjeg smanjenja mase i UPV-a u mješavinama s dodatkom pepela iz drvene biomase.

Abstract (english)

The aim of the experimental research, presented in this paper, is to investigate the influence of high temperatures on the mechanical properties of concrete with wood biomass ash (WBA). Four mixtures were made: one reference and mixes in which portland cement was replaced with different proportions of WBA (10-20%). Fresh properties (density, consistency and pore content) and 28-day compressive strength were tested. After exposure to high temperatures (up to 600 ° C) at the age of 90 days, the mechanical (compressive strength and modulus of elasticity) and physical (mass and UPV) properties were tested. The test results showed that increasing the WBA content reduces the consistency and compressive strength by up to 13%. Furthermore, by replacing portland cement with WBA in a amount of up to 20%, there is no additional degradation of mechanical and physical properties after high fire temperatures exposure. On the contrary, compared to the reference mix, in mixes containing WBA, there is a slight increase (up to 11%) of the residual mechanical properties, and a lower decrease in mass and UPV in the temperature range between 400 and 600 ° C.

• Keywords: beton; pepeo iz drvene biomase; visoke temperature; mehanička i fizikalna svojstva
• Keywords (english): concrete; wood biomass ash; high temperatures; mechanical and physical properties
• Language: croatian
• URN:NBN: urn:nbn:hr:237:618503
• Study programme: Title: Civil Engineering; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka građevinarstva (sveučilišni/a prvostupnik/ prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka građevinarstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Closed access
• Created on: 2020-10-30 07:23:59