Abstract
ABSTRACT Morphology studies assume significant importance in analysis of phenomena of granular systems packaging, in particular with a view to the use of the technique of soil stabilization named particle size correction in forest roads. In this context, this study aimed to develop and operationalize a Sand Grain Image Capture System and, hereby, determine the morphological indices of the sand fractions of two sandy soils called João Pinheiro (JP) and Cachoeira da Prata (CP). Soil samples, air-dried, were sieved (2.0 mm nominal mesh size) for removal of gravels. The materials that passed through the sieve were subjected to dispersion, washing in 0.053 mm nominal mesh size sieve, removal of organic matter and iron oxides to obtain the clean sand fractions. Subsequently, each soil sample was sieved for separation into twelve classes, between the diameters of 0.149 mm and 1.190 mm, using a Rotap shaker. Next, tests were carried out to characterize the morphometric attributes of the twelve classes of sand fractions of the soils studied. For validation of the performance of the Sand Grain Image Capture System, the results were compared to those obtained using a standard procedure for image analysis. The analysis of the results led to the following conclusions: (i) the sand fraction of the JP soil presented higher values for the morphometric indices roundness, elongation and compactness compared to sand fraction of the CP soil; and (ii) the Sand Grain Image Capture System worked properly, with practicality.
Highlights
The network of Brazilian forest roads consists mainly of dirt roads, which present significant technical challenges in the design, construction and maintenance phases in order to remain in adequate conditions of transit throughout the year
This study aimed to develop and operationalize a Sand Grain Image Capture System and, hereby, determine the morphological indices of the sand fractions of two sandy soils called João Pinheiro (JP) and Cachoeira da Prata (CP)
It was used the clean sand fraction of two sandy soils studied by Dalla Riva (2010), with different morphometric parameters, namely: (i) Cachoeira da Prata (CP soil); and (ii) João Pinheiro (JP soil)
Summary
The network of Brazilian forest roads consists mainly of dirt roads, which present significant technical challenges in the design, construction and maintenance phases in order to remain in adequate conditions of transit throughout the year In these roads, the soil is the building material par excellence, and the mechanical strength of the subgrade, in the case of design, and the prime coat, in situations of design and maintenance of roads, is of fundamental importance to ensure good performance along its useful life. These roads do not always have soils with adequate mechanical strength for the construction or improvement of road pavement at economically viable transportation distances This indicates the importance of using techniques for stabilization of local soils, especially the particle size correction that includes adding and or rearranging soil particles so as to produce alternative solutions for use in forest roads. The goal of this study was to develop and operationalize a system for capturing sand grain images, and hereby determine the morphological indices of the sand fraction of two sandy soils, and evaluate the performance of the system based on the morphometric parameters of these soils previously determined by Dalla Riva (2010), using a traditional system for analysis of sand grains images
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