Banca de QUALIFICAÇÃO: THAUANY ALVES PASTOR

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : THAUANY ALVES PASTOR
DATE: 19/12/2023
TIME: 13:30
LOCAL: Sala de Reuniões 2 - LCCV
TITLE:

Analysis of the feasibility of using construction and demolition waste to produce recycled blocks.

 

 

KEY WORDS:

Mixed recycled aggregate; Concrete blocks; Factorial Planning.

PAGES: 84
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Estruturas
SPECIALTY: Mecânica das Estruturas
SUMMARY:

The Northeast is the region with the third highest generation of construction and demolition waste (CDW) in the country, according to ABRELPE (2021). In particular, the metropolis of Alagoas (Maceió), which has the highest percentage of urban solid waste (MSW) generation, is one of the categories of CDW. With the increase in urbanization, there is a tendency for waste generation to grow, which has led the United Nations (UN) to highlight solid waste as one of today's main problems. Therefore, finding an appropriate destination for this waste strengthens environmental sustainability and the development of sustainable cities. In this context, a sustainable disposal opportunity arises for CDW, such as the production of new building materials, for example, recycled blocks. The aim of this research is to analyze the technical feasibility of using mixed recycled demolition aggregates to produce blocks. This objective arises from the problem of neighborhoods demolished by Braskem, due to soil instability resulting from the extraction of rock salt from underground deposits. To mitigate the social and environmental impact, it was necessary to manage the waste appropriately. The recycled aggregates, already processed, were collected, and underwent a process to remove impurities, followed by characterization procedures, along with tests to determine their physical and chemical properties. Based on this, a 3² factorial design was conducted, involving two factors (granulometry and moisture content) and three levels of granulometry (100% recycled coarse aggregate, 100% recycled fine aggregate and 100% natural aggregate), together with three levels of moisture content, to be determined by the compressive rheometry test. The proportion of the materials and their quantities will be determined by this test, investigating the contribution of each proportion of material and moisture content to the compressive strength for the production of the blocks. Finally, the blocks will be manufactured and subjected to compressive strength tests, followed by statistical analysis based on the results obtained. In the comparison between the second and first processing of the material, significant differences were observed. The fine recycled aggregate (AMR) from the second grinding had more fine particles than that from the first grinding. On the other hand, the recycled coarse aggregate (AGR) showed the opposite, with an increase in the percentage of fine particles compared to the previous stage. In addition, the second crushing of the material also contributed to the reduction of powdery material, resulting in a reduction in the aggregate's absorption capacity and, consequently, its porosity. This means less water is needed in concrete mixtures, a key factor in the production of stronger blocks.

COMMITTEE MEMBERS:
Presidente - 1640290 - WAYNE SANTOS DE ASSIS
Interno(a) - 1121792 - FLAVIO BARBOZA DE LIMA
Interno(a) - 2120767 - PAULO CESAR CORREIA GOMES