Browsing by Author "Bellolio, Juan Pablo"

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    Development of a methodology for measurement of vehicle dust generation on unpaved roads
    (NATL ACAD SCIENCES, 2007) Thenoux, Guillermo; Bellolio, Juan Pablo; Halles, Felipe
    This paper presents the results of a field study aimed at developing a methodology for measuring vehicle dust generation on an unpaved road. The methodology is based on the use of portable standard equipment known as Dust Mate. This equipment measures the number of particles per cubic centimeter for different particle sizes: particles less than 10, 2.5, and 1 mu m in diameter. The methodology was developed. to improve the management of unpaved roads and to study the performance of earth road dust suppressants. The Dust Mate equipment may be mounted in various types of vehicles, and measurements may be performed at various speeds. The equipment can record dust generation continuously and may be programmed to save the data for measurements over various time spans. This last feature will allow evaluation of short segments of the road (less than 10 m). The study was performed in three stages: determination of (a) the best design position of the equipment for different types of vehicles in combination with the effect of speed, (b) the repeatability of results for different operation parameters, and (c) the effectiveness of various dust suppressants. The research was done on test sections of unpaved mining and rural roads with different types of soil and surface conditions. The study indicates that the methodology developed for dust measurement with the Dust Mate equipment may be considered an improvement over the methods currently in use. The measurements are reliable, and the repeatability of the results is better than is required by today's standards.
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    Laboratory and field evaluation of fluid bed combustion fly ash as granular road stabilizer
    (NATL ACAD SCIENCES, 2007) Thenoux, Guillermo; Halles, Felipe; Vargas, Angeles; Bellolio, Juan Pablo; Carrillo, Hector
    This paper presents the result of laboratory and field research on soil stabilization using fluid bed combustion fly ash. This type of ash is the result of the combustion of petroleum coke and limestone in an electric power generation plant (Petropower, located in the south of Chile), which makes it different from other types of ash used regularly in soil stabilization. The ash differs from the traditional ash used in soil stabilization, particularly because of (a) a high concentration of lime that may produce cementing compounds and (b) the presence of sulfates that may produce a secondary reaction such as the formation of gypsum and ettringite, resulting in a different level of expansion in some types of soils. The main objectives of the research were to characterize fluid bed combustion fly ash from the Petropower plant and to evaluate the technical feasibility of using this ash as a soil stabilizer. The laboratory and field research showed that this type of ash improves the mechanical properties and water susceptibility of most types of soils. Although laboratory experimentation proves that the secondary reaction produces soil expansion in clayey soils, field experimentation indicates that the secondary reaction that produces soil expansion may be controlled by an adequate laboratory design and an appropriate dose of fly ash.