Razvoj modela hidratacije cementa

master's thesis

• Title (english): Cement hydration model development
• Author: Gordana Martinko
• Mentor: Juraj Šipušić (mentor)
• Committee member: Juraj Šipušić (predsjednik povjerenstva)
• Committee member: Emi Govorčin Bajsić (član povjerenstva)
• Committee member: Krunoslav Žižek (član povjerenstva)
• Granter: University of Zagreb; Faculty of Chemical Engineering and Technology; Zagreb
• Defense date and country: 2019-09-16, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Chemical Engineering

Abstract

Materijali pripremljeni uz dodatak cementa (mortovi i betoni) čine složeni polidisperzni i polifazni sustav te je za razvoj modela hidratacije cementa potrebno karakterizirati sustav pora cementne paste koji ovisi o uporabljenom vodocementnom omjeru. Uporabom većeg vodocementnog omjera rezultira veći volumen pora pripravljenog materijala, veća je permeabilnost materijala te je zbog toga i veća brzina korozije i manja trajnost ugrađenog materijala. Ukupni volumen koji zauzimaju čestice cementa u cementnoj pasti ovisi o vodocementnom omjeru, no moguće ga je smanjiti centrifugalnom sedimentacijom. Hidratacija cementne paste i sedimentirane cementne paste praćena je kalorimetrijskim određivanjem topline hidratacije tijekom 2 dana. Slagalina čestica cementa karakterizirana je mjerenjem kapilarnog upijanja i kontaktnog kuta sa različitim kapljevinama na tableti od prešanog cementnog praha. Na temelju provedenih mjerenja kapilarnog upijanja procijenjena je veličina pora slagaline praškastog cementa iz Lucas-Washburnove jednadžbe.

Abstract (english)

Materials prepared with the addition of cement (mortars and concretes) form a complex polydispersed and polyphase system, and in order to develop a cement hydration model, it is necessary to characterize the cement paste pore system, which depends on the water-cement ratio used. Using a larger water-cement ratio results in a larger pore volume of the prepared material, higher permeability of the material, and consequently a higher corrosion rate and less durable material. The total volume occupied by cement particles in the cement paste depends on the water-cement ratio but can be reduced by centrifugal sedimentation. Hydration of cement paste and sedimented cement paste was followed by calorimetric determination of hydration heat over 2 days. The cement particle packing is characterized by measuring the capillary absorption and contact angle with various liquids on a tablet of pressed cement powder. Based on the measurements of capillary absorption, the pore size of the powder cement packing was estimated from the Lucas-Washburn equation.

• Keywords: permeabilnost; raspodjela veličina čestica; hidratacija cementa; kapilarno upijanje
• Keywords (english): permeability; particle size distribution; cement hydration; capillary absorption
• Language: croatian
• URN:NBN: urn:nbn:hr:149:384763
• Study programme: Title: Materials Science and 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: 2022-02-23 14:27:07