Banca de DEFESA: ALESSANDRA DE SOUSA LIMA

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : ALESSANDRA DE SOUSA LIMA
DATE: 29/03/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

STUDY OF THE INFLUENCE OF THE PARTIAL REPLACEMENT OF FINE AGGREGATE BY GLASS WASTE IN MORTARS

KEY WORDS:

Mortars, glass waste, characterization, microstructure, compressive strength.

PAGES: 73
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

In this work, the influence of partial replacement of fine aggregate by glass waste was investigated in the mechanical property of compressive strength in mortars, as well as on the manufacturing stages. Mortars with glass waste substituting sand in the proportions of 10%, 20% and 30% in relation to the proportion adopted between cement and sand were manufactured, as well as mortars without this substitution. For the four cases 6 kg of cement, 2.9 kg of lime, 21 kg of sand and 4 kg of waste glass were used, using a water/cement ratio of 1.3. The compressive strength results revealed that the strength of mortars with glass waste decreased compared to the strength of the reference mortar, at both ages. Despite this decrease, the difference in mechanical behavior was small (< 1 MPa). Although it has caused a slight decrease in mortar strength values, the incorporation of glass waste in the mixtures has promoted a better workability of the mixtures, since the material does not absorb water. Additionally, chemical, structural, and microstructural characterization of the precursor materials and the obtained products was performed. Thus, X-ray diffraction (XRD), scanning electron microscopy (SEM), energy dispersive X-ray spectroscopy (EDS) and thermogravimetry (TG) analyses were performed. From the XRD analyses it was possible to identify the use of calcitic mortar, as well as the presence of systems such as quartz and hydrated calcium silicates. Through the SEM/EDS results it was possible to notice the good formation of the cement hydration products ettringite and portlandite, and with the thermogravimetric analysis the effect of high temperatures on the mortars. The results also showed that the mortars without glass waste showed the highest compressive strength values when compared to the cases where the sand was replaced by waste. Finally, when evaluating all the different types of mortars produced in this dissertation, the additions of 10% and 20% of glass waste lead to mortars with greater potential for applications in civil construction. 

COMMITTEE MEMBERS:
Externo à Instituição - FELIPE MENDES DA CRUZ - UPE
Presidente - 3100969 - NATHALIA BEZERRA DE LIMA
Interno - 2154866 - TIAGO FELIPE DE ABREU SANTOS