ITPN   24979
INSTITUTO DE TECNOLOGIA EN POLIMEROS Y NANOTECNOLOGIA
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Study of expansive soil and polymer interactions
Autor/es:
TERESA MARÍA PIQUÉ; MAURO CODEVILLA; MARIANO FERNANDEZ; DIEGO MANZANAL
Lugar:
Leeds
Reunión:
Congreso; 2nd Symposium on Coupled Phenomena in Environmental Geotechnics (; 2017
Institución organizadora:
School of Civil Engineering, University of Leeds
Resumen:
The purpose of this study is to evaluate the efficiency of different soil-polymers mixtures to control natural soil expansion. This work is part of an ongoing research project carried out at the School of Civil Engineering at Buenos Aires University. The soil-polymer mixtures were carried out with expansible high plasticity clay from Comodoro Rivadavia (Argentina, Chubut province). The clay exhibits plastic volumetric behavior over a wide range of moisture contents. Damages on light buildings caused by soil expansion were reported many times at the site (Orlandi et al., 2015). Its physical and mechanical characterization was done on earlier works (Ruiz et al 2012, Marti et al., 2015). In this research, soil was stabilized with three types of polymers: calcium lignosulfonate (CLS), cationic polyacrylamide (CPAM) and starch. To assess the impact of the polymer quantity within mixtures, three weight proportions were tested: 1.5, 3.0 and 5.0 % by weight of clay. The research was divided into two stages. Firstly, physical and mechanical characterization was carried out for all mixtures to determine polymer modifications and its proportion influence in controlling soil expansion. Finally, hydro-mechanical characterization of the selected mixture was performed: water retention curve was obtained and free swelling-swelling pressure tests were carried out. The attenuation of the expansion potential for the different percentage of four polymers is discussed. Results are presented in terms of variation on index properties, the effects of the polymer in the potential expansion of the soil and the relationship of suction-degree of saturation. The hydraulic and mechanical behavior of the selected mixture presented significant changes in comparison to the natural clay.