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Subgrade soils characterization data, for correlation of geotechnical variables on urban roads in northern Colombia

ABSTRACT: Within the variables relevant to the design of a pavement structure, the subgrade soils should be considered, which must be characterized in order to determine their mechanical properties and their bearing capacity. However, in developing countries such as Colombia, where the resources available for the design phase of a road project are very scarce, simplified and low-cost techniques should be used while delivering fast results, in order to be able to determine the geotechnical characteristics of soils. Therefore, it is necessary to look for correlations between the different geotechnical variables of subgrade soils. This document contains a database with the main physical characteristics of the soils. To collect these data, 46 geotechnical survey were carried out through several urban road sectors located in the city of Sincelejo, northern Colombia. Field tests were carried out with the Dynamic Cone Penetrometer and laboratory tests from undisturbed samples, for the realization of the California Bearing Ratio. Additionally, from disturbed samples, standard soil tests were conduct. The dataset obtained from the characterization of the soils, helps to create correlations between different variables, in such a way that it is possible to obtain bearing capacity parameters, such as CBR and Resilient Modulus, required for pavement design, based on simpler and faster tests such as the Dynamic Cone Penetrometer test, soil particle size analysis, the Atterberg limits or soil moisture content. In addition, these data can be supplemented by future researches in geographical regions with socioeconomic characteristics similar to those of Colombia.

SUBMITTER: Wilches F

PROVIDER: S-EPMC7415824 | biostudies-literature | 2020 Jul

REPOSITORIES: biostudies-literature

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Project description:BACKGROUND: Epidemiologic studies have linked exposure to traffic-generated air and noise pollution with a wide range of adverse health effects in children. Children spend a large portion of time at school, and both air pollution and noise are elevated in close proximity to roads, so school location may be an important determinant of exposure. No studies have yet examined the proximity of schools to major roads in Canadian cities. METHODS: Data on public elementary schools in Canada's 10 most populous cities were obtained from online databases. School addresses were geocoded and proximity to the nearest major road, defined using a standardized national road classification scheme, was calculated for each school. Based on measurements of nitrogen oxide concentrations, ultrafine particle counts, and noise levels in three Canadian cities we conservatively defined distances < 75 m from major roads as the zone of primary interest. Census data at the city and neighborhood levels were used to evaluate relationships between school proximity to major roads, urban density, and indicators of socioeconomic status. RESULTS: Addresses were obtained for 1,556 public elementary schools, 95% of which were successfully geocoded. Across all 10 cities, 16.3% of schools were located within 75 m of a major road, with wide variability between cities. Schools in neighborhoods with higher median income were less likely to be near major roads (OR per $20,000 increase: 0.81; 95% CI: 0.65, 1.00), while schools in densely populated neighborhoods were more frequently close to major roads (OR per 1,000 dwellings/km²: 1.07; 95% CI: 1.00, 1.16). Over 22% of schools in the lowest neighborhood income quintile were close to major roads, compared to 13% of schools in the highest income quintile. CONCLUSIONS: A substantial fraction of students at public elementary schools in Canada, particularly students attending schools in low income neighborhoods, may be exposed to elevated levels of air pollution and noise while at school. As a result, the locations of schools may negatively impact the healthy development and academic performance of a large number of Canadian children.

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Subgrade soils characterization data, for correlation of geotechnical variables on urban roads in northern Colombia

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