Banca de QUALIFICAÇÃO: DEBORAH GRASIELLY CIPRIANO DA SILVA

Uma banca de QUALIFICAÇÃO de DOUTORADO foi cadastrada pelo programa.
STUDENT : DEBORAH GRASIELLY CIPRIANO DA SILVA
DATE: 31/10/2023
LOCAL: Programa de Pós-Graduação em Ciência de Materiais
TITLE:

REUSE OF MARBLE SLURRY WASTE IN CEMENT MATRIX AND ITS CHEMICAL, MICROSTRUCTURAL AND MECHANICAL CHARACTERIZATION

KEY WORDS:

Ornamental stone waste; Marble slurry; Abrasive slurry; Construction Industry; Construction Materials.

PAGES: 77
BIG AREA: Outra
AREA: Multidisciplinar
SUMMARY:

The processing of dimension stones is responsible for a large generation of waste. The generation of this volume of waste has shown a significant increase due to the large participation of Brazilian companies in the national and international market in the production and export of ornamental stones, in addition to the growth of demand in civil construction, the main market. The cutting and polishing phase is carried out with the aid of running water and ends up generating a specific type of waste called marble work slurry or abrasive slurry (residue of a contaminating nature), composed of a mixture of powder from different types of rocks, water and remains of abrasive elements. Along with this, the progressive growth of the civil construction industry, recognized as one of the most important for the economic and social development of the country, is responsible for the high consumption of natural resources and the large generation of waste. Therefore, the objective of this study is to evaluate the possibilities of using marble slurry in the cement matrix, verifying its most optimized form of application. To this end, the waste was collected and subjected to primary and secondary treatment. In the primary treatment, the residue underwent drying in the open air and in an oven followed by crushing and sieving (75μm) to define low particle size. After primary treatment, the residue underwent heat treatment where the material was subjected to temperatures of up to 1200 ºC to verify the possibility of pozzolanic activity. The primarily treated residue was added to the cement matrix in varying proportions (10%, 15% and 20%) to verify its potential as a grain packaging filler. The heat-treated residue was applied to replace cement, also in varying proportions (10%, 15% and 20%), verifying its potential for pozzolanic activity. To correctly understand the performance of the waste within the cement matrix, an experimental plan was carried out that involved the chemical, microstructural and mechanical characterization of all materials involved. he analyzes carried out included laser granulometry tests, MEV/EDS, EDX, FTIR, FRX, compressive strength and tensile strength in flexion. Based on the partial results, it was observed that the residue has a low particle size, with 95% of the particles smaller than 78.14μm; presents particles with irregular and angular morphology with large dimensional variation in size; in elemental analysis EDS complemented with EDX consists mainly of silicon followed by aluminum, sodium and potassium indicating that it is a silico-aluminous residue; in specific mass analysis, the residue was found to have an absolute specific mass of 2.6g/cm³, a value similar to that of Portland cement; the mechanical performance results of the mixtures with the addition of the residue with primary treatment indicated a tendency towards increasing tensile strength in flexion and compression after 28 days in proportion to the percentages of residue addition in the mixtures The mechanical performance of the mixtures with the replacement of cement by the primarily treated waste, in turn, indicated an increase in tensile strength in flexion and a decrease in compressive strength as the cement was replaced by the waste. Given the partial results presented, the study infers the compatibility of the addition/replacement of marble sludge residue in the cement matrix as it brings positive results in terms of increased mechanical performance in addition to not negatively interfering with the hydration reactions of the matrix. Until the conclusion of this study, it is expected that the proposed hypotheses will be verified, contributing to a new use for marble sludge, bringing added value to the waste and favoring its removal from the environment.

COMMITTEE MEMBERS:
Externa à Instituição - ELIANA CRISTINA BARRETO MONTEIRO - UPE
Externa à Instituição - YÊDA VIEIRA PÓVOAS - UPE
Externo à Instituição - ÂNGELO JUST DA COSTA E SILVA - UPE