Banca de DEFESA: JEOVANA DA SILVA SOUTO MAIOR

Uma banca de DEFESA de MESTRADO foi cadastrada pelo programa.
STUDENT : JEOVANA DA SILVA SOUTO MAIOR
DATE: 01/11/2023
TIME: 09:00
LOCAL: Pós-Graduação Engenharia Civil
TITLE:

Improvement of Expansive Soils with the Use of Lime: A Review

KEY WORDS:

Expansive soils. Soil stabilization. Soil-Lime.

PAGES: 136
BIG AREA: Engenharias
AREA: Engenharia Civil
SUMMARY:

Expansive soils are found in large areas worldwide, and their presence is considered one of the most common causes of problems in structures, especially buildings and highways, leading to economic and social losses every year for repairing affected constructions. The use of lime to stabilize these soils allows for material reuse and the prevention of post-construction issues. Eighty studies were analyzed, including 2 theses, 6 dissertations, 71 articles, and 1 undergraduate thesis, published between 1991 and 2022 in 25 countries, on the improvement of expansive soils with lime, serving as a database for physical, chemical, mineralogical, microstructural, and geomechanical characterization. The selection of these studies was carried out on academic and scientific publication websites, such as SciELO, Web of Science, Scopus, ResearchGate, Google Scholar, Oasisbr, CAPES/MEC Journals, the virtual library of ABMS, Zoterobib, and BDTD. Criteria for inclusion required that the research yielded results related to particle size, mineralogy, consistency limits, expansivity, California Bearing Ratio (CBR), compaction, unconfined compressive strength, both before and after the addition of lime to improve expansive soils. Analysis of natural soils showed a predominance of fine texture, with an average liquid limit of 80% and plasticity index of 47%, indicating soils with a "very high" potential for expansion by Chen (1965), Seed et al (1962), and Daksanamurthy and Raman (1973) criteria. For soil treatment, 24% of the cases analyzed used a lime content of 6% to address expansion. 96% of the soils exhibited a decrease in plasticity index, while 75% experienced an increase in optimal moisture content, and 76% showed a reduction in maximum dry density. X-ray diffraction tests, TG, DTG, CBR, expansivity, and unconfined compressive strength tests confirmed that an increase in lime content and time are proportional to the results of expansive soils to be neutralized by pozzolanic reactions, even at low lime content. Among the 32 soils tested for free expansion, 8 of them eliminated the expansion potential, while in 19 cases, the potential was reduced to less than 1.5%. In 97% of the soils, their potential for expansion was reduced to at least 16%.

COMMITTEE MEMBERS:
Presidente - 1654153 - MARIA ODETE HOLANDA MARIANO
Externa ao Programa - 2984374 - MARIA ISABELA MARQUES DA CUNHA VIEIRA BELLO - UFPEExterno à Instituição - JOAQUIM TEODORO ROMAO DE OLIVEIRA - UNICAP