Banca de DEFESA: HENRIQUE COMBA GOMES

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : HENRIQUE COMBA GOMES
DATE: 01/02/2024
TIME: 10:00
LOCAL: Prédio 18
TITLE:

CO2 sequestration by construction and demolition waste applied into mortars.

KEY WORDS:

Construction and demolition waste. CO₂ capturing. Carbonation. Carbon market. Sustainability.

PAGES: 80
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

The construction industry plays a key role in the social and economic development of a country. However, the sector generates significant environmental impacts regards to the generation of construction and demolition waste (CDW). The management of CDW is one of the main challenges for sustainable development, one solution being the recycling of materials in the form of aggregates. With the consolidation of carbon credit markets, materials that can capture carbon dioxide (CO₂) have gained prominence for their possibility of trading carbon emission rights in these markets, generating economic gain. In this sense, researchers have studied the feasibility of CO₂ capture through recycled aggregates through the carbonation process. Carbonation occurs through contact between CO₂ and calcium ions (Ca²⁺) present in the cement, reacting and generating calcium carbonate compounds (CaCO₃) that are permanently attached to the material. Given this, this work seeks to evaluate the capacity of CO₂ capture by recycled aggregates produced from crushed concrete. For this, the pH inside the concrete was evaluated to confirm the potential to capture CO₂ due to the alkalinity present because of calcium ions. Then, the CDW aggregates were carbonated and successive measurements by mass and thermogravimetry (TGA) methods were performed to calculate the degree of carbonation of the aggregates and the CO₂ captured. Subsequently, the fine carbonated aggregates were recharacterized and applied to mortars to study the influence of carbonation on the properties of these composites. It was evaluated with physical, mechanical and durability tests. As a result, was confirmed the possibility of CO₂ capture by recycled concrete aggregates and its application within the carbon credit markets for economic gain. In addition, appliying carbonated recycled aggregates showed improvements in the mortar properties, enhancing physical properties, compressive strength and durability against water and acid attack. With these results, it seeks to promote sustainability in the field of construction materials aiming at sustainable development.

COMMITTEE MEMBERS:
Externo à Instituição - JOÃO PAULO CASTRO GOMES:
Interno - AUGUSTO CESAR DA SILVA BEZERRA
Presidente - FLAVIA SPITALE JACQUES POGGIALI