Mjerenje i modeliranje kemijskog skupljanja cementnog materijala

master's thesis

• Title (english): Measurement and modeling of cement materials' chemical shrinkage
• Author: Karlo Cmrk
• Mentor: Juraj Šipušić (mentor)
• Committee member: Juraj Šipušić (predsjednik povjerenstva)
• Committee member: Šime Ukić (član povjerenstva)
• Committee member: Krunoslav Žižek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2020-02-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Beton je kompozitni materijal koji se sastoji od cementa, vode, pijeska, agregata i niza dodataka kojima se postižu potrebna reološka i druga primjenska svojstva. Hidratacijom minerala cementa dolazi do porasta temperature i očvršćivanja betona, te njegova nepovratnog skupljanja koje se naziva kemijsko skupljanje. Kemijsko skupljanje dovodi do naprezanja cementnog materijala, te stvaranja mikropukotina koje smanjuju trajnost betona. Zbog velike primjene betona kao građevnog materijala, ključno je očuvati i poboljšati njegovu trajnost radi manjeg utjecaja na okoliš te financijske uštede. U ovom radu ispitana je gravimetrijska metoda mjerenja kemijskog skupljanja u aparaturi vlastite izvedbe. Prednost ovakvog pristupa je niža cijena aparature, mogućnost mjerenja više uzoraka odjednom, te kompenzacija utjecaja okoline dodanim referentnim senzorom.

Abstract (english)

Concrete is a composite material consisting of cement, water, sand, aggregates and a number of admixtures that provide the required rheological and other appropriate properties. Hydration of cement minerals results in an increase in temperature and hardening of concrete, and its irreversible shrinkage is called chemical shrinkage. Chemical shrinkage leads to strain on the cementitious material, creating a micro-crack that reduces the durability of the concrete. Due to the extensive use of concrete as a building material, it is crucial to preserve and improve its durability in order to lessen the environmental impact and bring financial savings. This paper examines the gravimetric method of measuring chemical shrinkage in self-made devices. The advantage of this approach is the lower cost of the device, the ability to measure more than one sample at a time and offsetting the environmental impact by the addition of a reference sensor.

• Keywords: kemijsko skupljanje; cement; gravimetrijska metoda
• Keywords (english): chemical shrinkage; cement; gravimetric method
• Language: croatian
• URN:NBN: urn:nbn:hr:149:712019
• Study programme: Title: Chemical Engineering - Graduate study; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka kemijskog inženjerstva (magistar/magistra inženjer/inženjerka kemijskog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2022-03-01 17:14:22