Banca de QUALIFICAÇÃO: RODOLFO AUGUSTO CARDOSO RIBEIRO

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : RODOLFO AUGUSTO CARDOSO RIBEIRO
DATE: 07/10/2025
TIME: 09:00
LOCAL: Instituto de Tecnologia
TITLE:

CEMENT-BASED BOARDS WITH INCORPORATION OF CONSTRUCTION AND DEMOLITION WASTE

KEY WORDS:

Construction and Demolition Waste, Cement-Based Boards, Mortar, Recycled Aggregates

PAGES: 60
BIG AREA: Engenharias
AREA: Engenharia de Materiais e Metalúrgica
SUMMARY:

The growing generation of Construction and Demolition Waste (CDW), estimated at 44 million tons in Brazil in 2023, represents a significant environmental challenge but also an opportunity for sustainability. Aligned with the UN Sustainable Development Goals (SDGs), especially SDG 11 (sustainable cities and communities), this dissertation investigates the technical and environmental feasibility of producing cement-based boards with the incorporation of CDW. The research aims to contribute to reducing the sector's environmental impact, preserving natural resources, and promoting the circular economy. Although the civil construction sector is a global economic driver, contributing significantly to the Gross Domestic Product (GDP) and job creation, it is also one of the largest generators of urban solid waste. In Brazil, despite the considerable installed capacity for CDW recycling, the effective production of recycled aggregates is consistently lower, indicating the need for optimization in the management and processing of these materials.The use of recycled aggregates in cementitious materials, while promising, presents challenges. The performance of recycled concrete aggregate (RCA) is often inferior to that of natural aggregate, which can result in lower mechanical strength, higher water absorption, and greater drying shrinkage in mortars and concretes.Given this scenario, this research proposes the fabrication of cement-based boards incorporating different contents of CDW. The methodology includes the characterization of the waste (chemical, physical, and micrographic analyses, such as X-ray Fluorescence, X-ray Diffraction, particle size analysis, specific gravity, void ratio, and moisture content), Portland cement type CPII, and natural sand. Mortar mixtures will be developed with 0%, 25%, and 75% substitution of conventional fine aggregate (sand) with CDW, adjusting the water/cement ratio to ensure workability.The produced cement-based boards will be subjected to fresh state tests, such as consistency index, and hardened state tests, such as compressive strength and permeability by capillarity. The expectation is to develop mortars using CDW in the composition to produce cement-based boards with characteristics similar or superior to commercial products.The project has a technological focus by developing an innovative and more sustainable product, providing data for its industrial production; an environmental focus, by reducing the amount of debris in landfills and decreasing the demand for virgin raw materials; and an economic focus, by potentially lowering production costs and fostering innovation in the construction industry. This study is expected to contribute significantly to the advancement of civil construction towards sustainability.

COMMITTEE MEMBERS:
Presidente - 1804954 - SIMONE PEREIRA TAGUCHI BORGES
Interna - 1810733 - TESSIE GOUVEA DA CRUZ LOPES
Externa à Instituição - ÉSOLY MADELEINE BENTO DOS SANTOS - UFF