Utjecaj mineralnih dodataka na svojstva betona

undergraduate thesis

• Title (english): Influence of mineral admixtures on concrete properties
• Author: Emma Horvat
• Mentor: Nina Štirmer (mentor)
• Committee member: Bojan Milovanović (predsjednik povjerenstva)
• Committee member: Marijana Serdar (član povjerenstva)
• Committee member: Nina Štirmer (član povjerenstva)
• Granter: University of Zagreb; Faculty of Civil Engineering; (Materials); Zagreb
• Defense date and country: 2021-07-13, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Civil Engineering

Abstract

U ovom radu obradit će se utjecaj mineralnih dodataka na svojstva betona kao što su silicijska prašina i leteći pepeo uključujući novija istraživanja koja se bave primjenom pepela drvne biomase i pepela nastalog spaljivanjem mulja od pročišćavanja otpadnih voda. Mineralni dodaci koji su obrađeni u ovom radu nastaju kao nusproizvod pri raznim procesima što znači da nije potrebno trošiti energiju za njihov nastanak, ali se javlja problem njihovog skladištenja i zbrinjavanja. Danas su sve viši zahtjevi za obnovljivom energijom, te sve stroža ograničenja emisije stakleničkih plinova zbog čega se dodatno želi povećati praksa upotrebe nusproizvoda. Kako su u pitanju vrlo male čestice koje lako mogu biti nošene vjetrom, te ih čovjek može udisati što za posljedicu može imati respiratorne probleme, potrebno je pronaći ekološki prihvatljivo rješenje i otkloniti mogućnost negativnog utjecaja na ljudski život. Smanjivanje negativnog utjecaja nusproizvoda se pokušava postići primjenom u građevinarstvu, odnosno u industriji betona. Prvih nekoliko poglavlja se bavi glavnim sastojcima betona, agregatom, cementom i vodom, a onda i mineralnim dodacima. Silcijska prašina i leteći pepeo od spaljivanja ugljena su već dobro poznati nusproizvodi iz velikih postrojenja koji su našli svoju primjenu zbog dobrih pucolanskih svojstva. Dodatkom silicijske prašine povećat ćemo 28 dnevnu tlačnu čvrstoću, dok ćemo dodatkom letećeg pepela smanjiti toplinu hidratacije i volumena zahvaćenog zraka u betonu. Novijim istraživanjima ćemo pokušati pronaći način primjene pepela od biomase i pepela od spaljivanja mulja.

Abstract (english)

This final seeks to address the impact of mineral admixtures on the properties of concrete such as silicon dust and fly ash including recent research dealing with the application of wood biomass ash and ash generated by incineration of sludge from wastewater treatment. The mineral additives that are treated in this final are created as a by-product in various processes, which means that we don´t use energy for their formation, but we have a problem with their storage and disposal. Today, there are increasing demands for renewable energy, and increasingly strict restrictions on greenhouse gas emissions, which is why we want to further increase the practice of using by-products. Very small particles of ash can easily be carried by the wind, and person can inhale them, which can result in respiratory problems. It is necessary to find an environmentally friendly solution and eliminate the possibility of negative impact on human life. Reducing the negative impact of by-products is trying to achieve by applying it in construction, more precisely in the concrete industry. The first few chapters deal with the main components of concrete and those are aggregate, cement and water, and then with mineral admixtures. Silicon dust and fly ash from coal combustion are already well-know by-products from large plants that have found their application due to their good pozzolanic properties. The addition of silicon dust will increase the 28-day compressive strength, while the addition of fly ash will reduce the heat of hydration and the volume of air trapped in the concrete. Recent research will try to find a way to apply biomass ash and sludge incineration ash.

• Keywords: mineralni dodaci; beton; leteći pepeo; pepo drvne biomase; pepeo od spaljivanja mulja
• Keywords (english): mineral admixtures; concrete; fly ash; wood biomass ash; sewage sludge inceneration ash
• Language: croatian
• URN:NBN: urn:nbn:hr:237:058299
• 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: 2022-04-01 08:08:13