Banca de DEFESA: JOÃO EMANUELL ARAÚJO MARCIANO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JOÃO EMANUELL ARAÚJO MARCIANO
DATE: 25/02/2022
TIME: 14:00
LOCAL: Auditório Pós-Graduação em Engenharia Civil on line
TITLE:

Concrete Proportioning with Construction Waste - Application of Optimized Grading Curves

KEY WORDS:

construction waste, grading curves, mix design, concrete with mixed recycled aggregate.

PAGES: 149
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The generation of construction waste has emerged in recent decades due to the accelerated development of infrastructure. The concrete industry consumes a large amount of natural resources, and some of the current challenges for concrete technology consists in minimizing environmental impacts, decreasing energy consumption, and reducing CO2 emissions associated with its production. The use of recycled aggregates represents a viable solution for the development of sustainable concrete, more economical, and of reduced environmental impacts, since it preserves natural resources, reduces energy production and reduces the amount of waste deposited in landfills. The choice of materials needs to be carefully considered. It is important that the physical characteristics are not too variable, especially with regard to granulometry. Thus, by means of a pilot study, the granulometric distribution curve optimized from the Furnas model was selected, to be used in the dosage of concrete with mixed recycled aggregate, obtaining concrete with compressive strength classes ranging from 20 to 50 MPa. The materials used in the pilot study were cement CP II F-40, caxitú sand, stone powder and crushed granitic rocks 9.5 mm and 19 mm. In the second stage, the same aggregates used in the pilot study were employed, except for the stone powder. In substitution of the fine and coarse fractions, recycled coarse aggregate and recycled fine aggregate, both of mixed nature, were used. The concretes were dosed in 1:3, 1:5 and 1:6 mixes, following the principle of concrete mix design of the IPT/EPUSP method. The results were submitted to the Shapiro-Wilk normality and Levene homogeneity tests. Kruskal-Wallis non-parametric test and Dunn post-test were applied for data that did not follow normality, and ANOVA test and Tukey post-test for those that followed normality and homogeneity at 5% probability level for rejection of the null hypothesis. The dispersion of the compressive strength values in the compositions allowed considering that the variance between treatments is not statistically equal, revealing the usefulness of the approach in problems associated with the use of recycled aggregates, in order to favor their use in real structures with strength prediction.

BANKING MEMBERS:
Presidente - 1152919 - ARNALDO MANOEL PEREIRA CARNEIRO
Externo à Instituição - MARCIO SANTOS BARATA - UFPA
Externa à Instituição - KAROLINE ALVES DE MELO MORAES - UFAL