<p>In this work, the shoes are studied as structural elements, which have the function of receiving the internal forces of beams, columns and slabs and distribute them on the ground. These elements have constant or variable thickness and its support is square, rectangular or trapezoidal, as well as having small height above the base area. Another feature of this superficial foundation is that it works submitted to bending. The objective is to analyze a geometric dimensioning, which is the first stage of the project to be made for a maximum permissible voltage is determined depending on soil conditions and load capacity that is submitted; reiterate that the safety factors are essential for geotechnical problems, because the soil participating in the behavior of a foundation are in most cases heterogeneous, resulting in the difficulty of its precise knowledge; demonstrate that a shallow foundation should be deep enough in order to prevent possible deformations due to volume variation of the land and confirm that through a well-founded technical study, one shoes structure project can be economically viable and safe. The test results of shoes subjected to the action of bending moments in brittle and hard soils demonstrated that they are designed for shallow foundation of reinforced concrete, so that exhibit good performance in terms of resistance to tensile stresses arising therein, which are restricted by the action of armor. The information collected through the in situ geotechnical study, determined that the calculation of base area is obtained by the massive features. Through the data characteristics of testing a submerged soil, caused by the action of water levels, it is eminent to be realized reduction in the foundation of load capacity, since it contributes to the occurrence of settlements and consequently, structural collapses. Therefore, with the diversity of shoes that are available to civil engineers, the quality and the behavior of a foundation depends on an analysis reconciling the technical and economic aspects of each work. Any failure during the project preparation stage and execution can result in high costs of repair or structural collapses or soil.</p>

This paper presents a comparative analysis of the results obtained in static modulus of elasticity tests of plain concrete cylindrical specimens. The purpose of this study is to identify and evaluate the influence of several factors involved in modulus of elasticity tests such as the strain measurement device used (dial indicators, electrical surface bonded strain gages, externally fixed strain gages and linear variation displacement transducer - LVDT), the type of concrete (Class C30 and Class C60) and cylindrical specimen size (100 mm x 200 mm and 150 mm x 300 mm). The modulus tests were done in two different laboratories in the Goiânia, GO region and were performed according to code ABNT NBR 8522:2008, which describes the initial tangent modulus test, characterized by strains measured at tension values of 0.5 MPa and 30% of the ultimate load. One hundred and sixty specimens were tested with statistically satisfactory results. It was concluded that the type of strain measurement device greatly influenced the modulus of elasticity results. Tests in specimens 100 mm x 200 mm showed highest statistical variation.

<p>This paper presents a comparative analysis of the results obtained for testing the compressive strength by means of an interlaboratory test program in hardened concrete, developed in two different laboratories in the Goiânia, GO region, to identify and assess the influence of some factors affecting the results of compressive strength test. For this, we sought to determine the outcome of compressive strength, the influence of the concrete (Class C30 and CAR - High Strength Concrete), the size of the body of proof cylindrical (100 mm x 200 mm and 150 mm x 300 mm) and the type of laboratory. It was concluded that the type of concrete and type of lab results influenced the compressive strength. Moreover, it is noteworthy that the bodies of evidence dimension 100 mm x 200 mm of concrete Class C30 and of CAR (Class C60) presented the results with the highest dispersion.</p>

This paper presents a comparative analysis of the results obtained for testing the tensile modulus, through a collaborative program of tests on hardened concrete, developed at the School of Civil Engineering, Federal University of Goiás, in the Department of Technical Support and Control of Furnas central Electric Company SA and Carlos Campos and Construction Consultancy Limited., to identify and assess the influence of some factors involved in the test results the elastic modulus. This test was performed according to ABNT NBR 8522:2008, loading plan initial tangent modulus characterizing the deformation of concrete subjected to the stresses of 0.5 MPa and 30% of the breaking load. For this, we sought to determine the outcome of the module, the influence of strain gauge (compressômetro mechanical, electrical bonding surface extensometer extensometer and electric external fixation) and rate (0.3 and 0.6 MPa/s) bodies on the test piece cylindrical size 150 mm x 300 mm C30 concrete class. We performed 60 trials considering the results with satisfactory performance in the statistical techniques of the program. It was concluded that the strain gauge type of load and speed significantly influenced the results of elastic modulus. Moreover, it is noteworthy that the bodies of the test piece size 150 mm x 300 mm concrete Class C30, tested with loading speed of the testing machine of 0.3 MPa/s presented the results with the highest dispersion.

<p>This paper presents a comparative analysis of the results obtained for the test of compressive strength, through a program of interlaboratory tests on hardened concrete, the Company developed Carlos Campos Consultoria e Construções Ltda., in the School of Civil Engineering Federal University of Goiás and in the Department of Technical Support and Control of Furnas Centrais Elétricas S.A., located in Goiânia-Goiás, to identify and evaluate the influence of some factors involved in test compressive strength. For this, we sought to verify the result of compressive strength, the influence of the type of processor (A and B) and upload speed (0.3 and</p><p>0.6 MPa/s) body-of-proof cylindrical size 150 mm x 300 mm in the concrete class C30. It was concluded that the type of laboratory significantly affect the results of compressive strength. Furthermore, it is noteworthy that the body-of-evidence dimension 150 mm x 300 mm concrete class C30, tested with a loading speed of the testing machine of 0.3 MPa/s presented the results to the larger dispersions.</p>