Banca de DEFESA: MARTHA MARIA BEZERRA SANTOS

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : MARTHA MARIA BEZERRA SANTOS
DATE: 07/06/2023
TIME: 09:00
LOCAL: Programa de Pós-Graduação em Engenharia Civil
TITLE:

Influence of the Insertion of the Cocoa Almond Hull in the Hydraulic, Mechanical Behavior and in the Fissuration Process of an Expansive Soil

KEY WORDS:

Reinforcement with particles; Agricultural waste; Crack Propagation

PAGES: 147
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

The main residues generated by the cocoa agro-industry consist mainly of the fruit husk (six tons for each ton of almonds) and the almond husk (between 8,000 and 12,000 tons per year). Bahia is a major producer of cocoa and the volume of this residue tends to increase. Furthermore, the state presents the occurrence of expansive soils, such as massapê. Thus, we seek to analyze the possibility of stabilizing an expansive soil that, for the purposes of the study, was used in the soil of Paulista-PE, with the shell of the cocoa bean. Laboratory tests were performed on compacted samples of natural soil, and mixtures of soil with bark, in weight proportions of 2.5%, 5%, 7.5%, 10% and 12.5%. Tests of: particle size, grain density, consistency limits, compaction, hydraulic conductivity, free expansion, expansion stress, squeeze flow, simple and diametral compression, direct shear, formation and propagation of cracks and suction by drying were carried out. The hydraulic conductivity reduces from the order of 10-9 cm/s to the order of 10-11 cm/s with the mixtures of 7.5%, 10% and 12.5%. The mixture of soil + 10% bark presents the best result, reducing the “free” expansion of the natural soil from 12.50% to 8.90% and reducing the expansion stress by 71.36%. The cocoa bean shell in the soil does not improve the resistance to simple compression and tensile by diametral compression. Cohesion decreases and the friction angle of mixtures also decreases. The addition of bark to the soil causes the cracking process to occur faster, decreases the final cracked area (80.55% for the soil mixture + 12.5%) and increases the suction of air and moisture intake of saturation. The inclusion of cocoa bean husk in the high expansion compacted soil of Paulista-PE reduces “free” expansion (29%) and expansion stress (80%). As the addition reduces the permeability coefficient by about 100 times, increases the humidity of the air inlet, reduces the cracked area, a viable application is covering a sanitary landfill.

COMMITTEE MEMBERS:
Externo à Instituição - JOAQUIM TEODORO ROMAO DE OLIVEIRA - UNICAP
Externa ao Programa - 2984374 - MARIA ISABELA MARQUES DA CUNHA VIEIRA BELLO - nullPresidente - 1132311 - SILVIO ROMERO DE MELO FERREIRA
Externo à Instituição - SÉRGIO CARVALHO DE PAIVA - UNICAP