Estabilização de um solo arenoso fino com emulsão asfáltica visando futura utilização em estradas não-pavimentadas

Abstract

Chemical stabilization with asphalt emulsion seeks to enhance existing parameters in the soil for specific purposes. The objective of this study is to evaluate the behavior of the mixture of an asphaltic emulsion RM-1C with a fine sandy soil against the Simple Compressive Strength (RCS) test, aiming at its use as a low-cost alternative on unpaved roads. The study seeks to analyze together with this the increment of equations based on soil granulometry to determine the ideal asphalt emulsion content. Within this context, soil characterization tests were carried out, determination of optimal moisture (Wótima) and maximum apparent dry specific mass (MEASmáx) for the pure soil and with 4%, 6% and 8% of asphaltic emulsion RM-1C as a starting parameter. Then, the determination of the ideal asphalt emulsion content and the RCS test for the aeration time of 1h and 2h for emulsion rupture, with 7 and 28 days of curing time at an ambient temperature of 21ºC. The RCS test was carried out for the specimens with immersion in water for 24 hours and without immersion. An increase in RCS was verified for the value of 4% of asphaltic emulsion added to the mixture, which is the closest to the ideal content. While for values higher than the ideal content (6% and 8%) a decrease in RCS and an increase in the impermeability of the grains was observed. There was also a need for a cure to increase RCS. Therefore, the fine sandy soil analyzed showed satisfactory results for use as a base for road purposes at a low content, thus characterizing the feasibility of application at low cost. Keywords: chemical stabilization; asphalt emulsion; fine sandy soil; unpaved roads.