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Ensayos Completos
Lists What are lists? Login to add to list. Be the first to add this to a list. The optimal bitumen content 4. In statistics, the extraction of scientifically valid conclusions for a population, based on sampling results, presupposes the assumption of normality, and this means that the sample data must be checked for compliance with this assumption. This can be done by using the central limit theorem, which guarantees that the distribution of sample data will be normal when the size of the sample is sufficiently large greater than 30 [19]. These samples were labeled with their mixing and manufacturing date.
They were characterized both at the site and in the Construction Engineering Laboratory at the University of Granada. In Spain, one of the laboratory procedures used to measure a mix's resistance to plastic deformation is the ensayo en pista de laboratorio [wheel-tracking test], described in the Spanish Technical NLT Standards [14], Road Tests of the Centro de Estudio de Carreteras Road Study Center.
As part of this test, a vibratory compactor is used to manufacture three prismatic test specimens xx50 mm , whose height varies, depending on maximum aggregate size. The specimens are then subjected to repeated passes of a loaded wheel. Periodic measurements of deformation depth are made during a period of min or until the total deformation reaches 15 mm. In contrast, the UNE-EN [15] ensayo de rodadura wheel-tracking test involves the manufacture of 2 parallelepiped test specimens with a roller compactor [20].
The height of the specimens varies, depending on maximum aggregate size.
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Although the European standard specifies 3 types of wheel device, Spain uses the smallest one, namely, Procedure B [16]. This device consists of a loaded wheel that repeatedly passes over the test specimen. The load applied is N at a frequency of Another mechanism measures the speed at which the rut forms on the surface of the specimen. The test ends after 10, passes of the loaded wheel or until the deformation depth reaches 20 mm.
The deformation slope is determined based on the rut depth between 5, and 10, cycles. The results obtained are shown in Tables 1 and 2. However, this model was not valid since the determination coefficient R2 was low.
The Kolmogorov-Smirnov test was then applied to a sample in order to determine the goodness-of-fit of the variables to a certain theoretical probability distribution. In this case, both were found to fit the normal distribution.
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Once the normality of the samples was determined, it was necessary to verify whether there was a statistically significant difference between the distributions of the two variables under consideration. For this purpose, the t-test was performed on the two independent samples. This was done to see whether the populational mean values of the two normal and independent populations were equal. Figures 2 and 3 show the results obtained for each of these tests and the corresponding limit value.
All of the values obtained in the NLT wheel-tracking test see Fig. In contrast, only 4 of the samples tested meet the O. The results obtained in this study were statistically analyzed with a view to discovering whether NLT limit values were equivalent to those in the UNE-EN requirements. Moreover, the determination coefficient value was low 5. Therefore, this method was not viable for our purposes. However, it was possible to verify the normality of the variables with the Kolmogorov-Simirnov test see Table 3.
Ensayos Completos (English, Spanish, Hardcover)
Based on the p-value or empirical significance level of the Kolmogorov-Smirnov test for both variables 0. Nevertheless, to verify if this was indeed the case, the T-test for equality of means was applied see Table 4. Based on the p-value Sig. Therefore, even though the distributions of the 2 variables are normal, they do not have the same distribution since neither their means nor their variances coincide.
The value thus obtained was 0.
Ensayos Completos/complete Essays (Spanish Edition): Karen Blixen: theranchhands.com: Books
As can be observed in Fig. In other words, before the regulations were changed when the CE marking went into force, all of the mixes tested in this study met the PG3 requirements and thus were considered apt for use in road construction. However, now these same mixes are not in compliance with regulations.