Name: FLÁVIA CASAGRANDE BASTOS
Type: MSc dissertation
Publication date: 24/02/2022
Advisor:
Name |
Role |
|---|---|
| PATRÍCIO JOSÉ MOREIRA PIRES | Advisor * |
Examining board:
| Name |
Role |
|---|---|
| JAMILLA EMI SUDO LUTIF TEIXEIRA | Co advisor * |
| PATRÍCIO JOSÉ MOREIRA PIRES | Advisor * |
| RONALDO PILAR | Internal Examiner * |
Summary: BASTOS, Flávia Casagrande. Field and laboratory study of the mechanical
behavior of soil stabilized with KR slag. 2022. Dissertation (Mast
Engineering) Post-Graduation Program in Civil Engineering, Federal University of
Espírito Santo, Vitória ES, 2022. Advisor: Prof. Dr. Patrício José Moreira Pires.
Coordination: Prof.a Ph.D Jamilla Emi Sudo Lutif Teixeira.
Road transport is the most used modal in Brazil, being essential the adequate sizing
of the pavement structure and the control of its deformations. It is expected that this
control starts in the laboratory stage with the characterization of the stiffness and
resistance to permanent deformation of the materials used for the correct design using
performance prediction models. Since the materials found in Espírito Santo have low
strength, stabilization techniques are constantly used to improve the mechanical
characteristics of these materials. Steel by-products have been increasingly used as
alternative materials for soil stabilization. Thus, in this work, the mechanical behavior
of the incorporation of KR (Kambara reactor) slag into a clayey material is studied. To
achieve the objectives, laboratory tests of resilient modulus and permanent
deformation were used in samples of pure soil and with the addition of KR for various
curing periods (7, 14 and 28 days). Subsequently, field performance predictions were
made using the new national mechanistic-empirical method (MeDiNa) and the results
were compared to real data obtained in experimental tracks. It appears that the use of
KR slag in clayey soil resulted in an increase in the resilient modulus, while longer
curing times did not generate higher modulus values. The incorporation of KR
increased the resistance to permanent deformation and the longer curing time resulted
in a greater reduction in such deformations. Although the soil mixture with KR presents
an increase in resilient modulus and permanent deformation resistance, the material
tends to present an improved soil behavior, according to the models implemented in
MeDiNa, and not a chemically stabilized material. The field results show that the
solution meets the wheel track rutting design criteria, while in the method the values
are very close to these limits, being a viable option for use in pavements.
Keywords: Paving; Soil stabilization; Cement-Modified Soil (CMS); Sizing; MeDiNa.
