Name: DÉBORA FERRÃO ANTONIO
Publication date: 27/05/2024
Examining board:
Name |
Role |
|---|---|
| CARLA THEREZINHA DALVI BORJAILLE ALLEDI | Examinador Externo |
| PATRICIO JOSE MOREIRA PIRES | Presidente |
| ROMULO CASTELLO HENRIQUES RIBEIRO | Examinador Externo |
Summary: Based on the need to improve very soft soils and high compressibility, several studies
have been carried out to analyze the applicability of additives in the chemical stabilization of soil, especially cement substitutes, aiming for better cost/benefit for civil construction and sustainable materials. In this context, there are several additives that can be applied, and studies vary in relation to their objectives, but their main focus is
to evaluate the improvement of soil parameters with an increase in curing time. This
work seeks to analyze the replacement of cement in soil improvement by industrial byproducts, such as granulated blast furnace slag (GAFm) and FGD residue, in a clayey
soil (CL) of high liquid limit for long periods of sample curing, up to 490 days, with physical analyzes of humidity and Atterberg limits, as well as mechanical analyzes of resistance to unconfined compression and consolidation. The results showed that the GAFm additive especially requires curing time to improve the plasticity parameters and unconfined compressive strength, going from 232kPa after 90 days of curing to 1738kPa after 490 days of curing. The mixture with soil cement demonstrated a significant drop of 43% in unconfined compressive strength during this period, emphasizing the importance of evaluating time in this practical applicability. Regarding the compressibility of the soil, it was observed that the “cement soil” was more stable over time and with a greater reduction in void rates than the mixtures with other
additives, although they all showed improvements in relation to the soil pure. It is
concluded that, in fact, when analyzing the practical applicability of sustainable additives, the time parameter must be taken into account, especially for more than 90 days of curing, which is what occurs in practice.
