Banca de DEFESA: DANIELE MENDES DE OLIVEIRA ARCANJO

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
DISCENTE : DANIELE MENDES DE OLIVEIRA ARCANJO
DATA : 10/05/2019
HORA: 14:00
LOCAL: PROGRAMA DE PÓS-GRADUAÇÃO EM ENGENHARIA CIVIL
TÍTULO:

STUDY OF THE APPLICATION OF ALKALI-ACTIVATED AGGLOMERANT IN STABILIZATION OF SOILS FOR PAVIMENTATIONS

PALAVRAS-CHAVES:

Soil stabilization, alkali-activated; road pavement and mechanical resistance.

PÁGINAS: 173
GRANDE ÁREA: Engenharias
ÁREA: Engenharia Civil
RESUMO:

A search for new materials that replace Portland cement has been increasing over the years because of an environmental and durability problem. This context the basis of aluminosilicates the common products used in production of alkali-activated binders (AAA). These are a proposal for total or partial replacement of Portland cement for high mechanical strengths, a high thermal resistance and a possibility of incorporation of agroindustrial residues. Results measurement processes continued to be scarce and the risks of years more difficult to achieve. Thus, the present work is to study an alkali-activated binder in the chemical stabilization of soils for road pavements. The research began with an experimental program, where the characterization of the raw materials, the development of the alkali and cement dosages and the mixing process of the same occurred. The precursor (source of alumina and silica) was metakaolin, the activator (the alkaline material) the alternative sodium silicate and the soil stabilized as clayey with little silt. There were 5 principles, 5, 7, 10, 15 and 20% of metacaulim plus alkaline activator. These were compared to the soil-cement mixture with 7% addition and with the natural soil. In the preliminary evaluation of the samples, intensive tests of resistance to the simple economy and CBR were carried out. Soil-AAA mixtures (10, 15 and 20%) are superior to the soil-cement mixtures. However, the percentage of 7% of metakaolin was what increased the lower material consumption and mechanical resistance higher than 2.1 MPa. This being the last element of choice chosen to stabilize. O, the percentage of 7% of metacaulim was the lowest material consumption and mechanical strength higher than 2.1 MPa, being this the deposition content for the stabilization of the studied soil and for the other characterization and durability tests , the final step of the research. At this stage it was observed that the alkali-activated agglomerate modified a soil structure promoting the geopolymer reactions, generating greater adhesion between the genera and thus interfering in the soil properties. Thus, by analyzing the results of the studies, the stabilization with actively obtained materials proved to be an innovative and viable material to improve the properties of the soils applied to road pavements.

 

MEMBROS DA BANCA:
Externo à Instituição - ANTÔNIO THOMÉ
Presidente - 1522482 - FRANCISCO GABRIEL SANTOS SILVA
Interno - 1299309 - MIRIAM DE FATIMA CARVALHO MACHADO
Interno - 1219972 - SANDRO LEMOS MACHADO