Banca de QUALIFICAÇÃO: ALAN ROBERTO SILVA DANTAS

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : ALAN ROBERTO SILVA DANTAS
DATE: 03/05/2021
TIME: 16:00
LOCAL: meet.google.com/rwe-syjf-ziv
TITLE:

Evaluation of the properties of self-leveling mortars using construction and demolition waste from a recycling plant

KEY WORDS:

Self-leveling mortars, CDW, fresh state, mechanical properties.

PAGES: 28
BIG AREA: Engenharias
AREA: Engenharia Civil
SUBÁREA: Construção Civil
SPECIALTY: Materiais e Componentes de Construção
SUMMARY:

Worldwide data show that in recent years the amount of waste generated from civil construction activities has grown unbridled, making it necessary to have a sustainable vision for these impacts provided to the environment. Among the forms of conscientious use of these materials, the use of construction and demolition waste (CDW) for the production of recycled aggregates (RA) stands out, which in addition to sustainable benefits, are promising due to their economic advantages and their possibility to present good behavior in chemical, physical and mechanical properties, in mixtures developed with cementitious materials. However, its application has been limited by the lack of specific regulation of its production and studies on the behavior of the material in new perspectives. Based on this need, this study aims to analyze the characteristics of the RA produced in a CDW recycling plant, in 6 different crushings, and to evaluate the influences of their partial and total replacement as fine aggregate in self-leveling mortars, in its properties in the fresh and hardened state. The aggregate was replaced by 50% and 100%, tested under supply conditions by the recycling plant and also benefited by the removal of powdery materials, in addition to being evaluated with and without mineral limestone filler. In the fresh state, the properties of self-leveling mortars investigated the flow capacity, viscosity and mass density and, in turn, in the hardened state, the tests performed evaluated the resistance to compression and flexion, the dynamic elasticity module, the capillary absorption of water and adhesion. From that, it was verified the effectiveness of all the RA substitution percentages in the self-compacting mortar, which were shown to have good characteristics, free from exudation and segregation, however, when they had their results of flow capacity in small and large size faced, it could be noted that the behavior of the mortar studied in the laboratories is not necessarily similar to that of the constructions. In addition, the lack of geometric patterning of the ARs also caused unexpected behaviors related to the decrease in mass density and irregular shapes in the spreadings for 100% substitutions.

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