Capture of CO2 cement products: the effect filler content.

Author(s)

Daniele de Lima Thomaz Pessutto

• Document type: Master's Dissertation
• Press: São Paulo.
• Institution: Universidade de São Paulo (USP). Escola Politécnica (EP/BC)
• Defense date: 2020-06-15

Examining board members

Vanderley Moacyr John; Edna Possan; Rui Barbosa de Souza

• Advisor: Vanderley Moacyr John

Abstract

The population growth demands more buildings and infrastructure in the city and countryside, and cement is an essential material for it. Your production emits a considerable amount of CO2 due to the combustive oxidation and the calcium decarbonation. The cement industry issues 5 to 8% of anthropogenic CO2. To mitigate these emissions, the industry foresees to invest in sequestration and capture carbon by using renewable energy and clinker partial substitution with other supplementary materials. On the other hand, the cementitious materials capture CO2 during the use phase buildings, through the carbonation. Therefore, researches related to this subject has grown in the past years, but the filler effect in the capture of CO2 is widely ignored. For that reason, this study aims to quantify the CO2 capture over time by cement mortars with different filler content. The carbonation depth was measured by image analysis and CO2 capture potential was measured by the relationship between the chemical analysis (measured by x-ray fluorescence) and the mass loss of volatiles (by thermogravimetry). The carbonation depth, the CO2 capture and carbonation kinetics increased proportionally with filler content and porosity. Comparing the proposed methods of carbonation measurement, it was observed that the CaO carbonated fraction and the carbonation depth had shown a direct relationship with R2 of 93%. Thus, it was possible to estimate the capture CO2 capture of the cementitious materials by using the methods mentioned and the filler helps to accelerate the CO2 capture on concrete structures during your life cycle. (AU)

• FAPESP's process: 17/14400-1 - Capture of CO2 in cement products: the effects of the filler content
• Grantee: Daniele de Lima Thomaz Pessutto
• Support Opportunities: Scholarships in Brazil - Master