[PDF] Top 20 Rev. IBRACON Estrut. Mater. vol.6 número6

... Roughly half of cement making CO 2 is emitted during decarbon- ation of limestone into calcium oxide, which will react with silica and aluminum oxide to produce Portland clinker. Substituting sup- plementary cementitious ... See full document

... compacted in optimum moisture content in modiied energy). How- ever, the direct tensile tests have never been considered as an element for measuring concrete strength (Troxellet al. [1]) and they also encounter ... See full document

... Approximately 1,200 laboratory tests results of reinforced concrete beams under shear stresses were used in a comparative analysis among values from prediction models of codes and labor[r] ... See full document

... Bending tests can be made according to the FIP guidelines [4]. A rigid beam should be used to transfer the force to the slab, for example a steel beam. The rigid beam has the purpose to ensure a uniform load distribution ... See full document

... In all cases, concrete with total milled fraction incorporation were the most af- fected in relation to the reduction in the values of elasticity modulus. By making comparative judgment[r] ... See full document

... We are now releasing the last number of the sixth volume of the IBRACON Structures and Materials Journal (Volume 6 Number 6, December 2013). With this number we have six volumes completed without ... See full document

... Many works have been proposing the automation of the identii- cation and valuation of the increase rate of cracks on masonry. Some works have utilized video images, applying color contrast techniques between concrete and ... See full document

... Previously works using photogrammetry and image processing in structural monitoring have shown that the precision obtained in the displacement ield is typically better than 0.050 mm. Thus, in order to measure a uniform ... See full document

... Prassianakis & Prassianakis [4] evaluated the ability of non-destruc- tive testing to determine the integrity of concrete specimens, and they concluded that this methodology is feasible for blocks evaluation. Hamid ... See full document

... From the perspective of rheological behavior, it is assumed that mortar adhesives are concentrated suspensions of solid particles immersed in a viscous liquid which has the function of ensuring the cohesion of the system ... See full document

... The April 2013 issue of the IBRACON Structures and Materials Journal (Volume 6 Number 2) is now released. In this issue, the irst article discusses cathodic protection methods for both preventing premature ... See full document

... Finally, the utilization of numerical models to represent the bond behavior in a beam test, using ordinary concrete (OC) and self- compacting concrete (SCC), presented a good approach, [r] ... See full document

... Figure 6, the values for the compliance function for 365 days from specimens loaded at 14 days was 99me/MPa and 78 me/MPa regarding specimens kept inside and outside the cham- ber, respectively ... See full document

... As can be seen in Figure 6, the cathodic protection current ap- plied on the steel reinforcement may cause other chemical modi- ication in the concrete. Negative ions (hydroxides, chlorides, carbonates and ... See full document

... In assessing the consistency of ready mix concrete over the ive sampling points during discharge from mixer truck can observe a linear reduction of the slump from the starting [r] ... See full document

... The inite element model used for numerical simulations has shown to be a valuable tool to analyze this type of problem. Its eficiency was demonstrated when the results were compared with the ex- perimental values ... See full document

... Parametric study conducted by Horowitz and Marques[6] shows that η values varies between 0.44 and 0.75, and is high- ly dependent on the ratio of beam to column section heights, thus not being convenient for ... See full document

... Among the various nondestructive test methods available, the ultra- sonic pulse velocity method has been widely used in concrete struc- tures. It has been applied to evaluate the resistance of concrete using ... See full document

... Regarding the strains in concrete, it is observed that near the column face, slabs LC3 and LC4 presented higher compressive strains than slab LC2.This behavior was different [r] ... See full document

... In literature, there exist several tests that allow determining the bond stress-slip relationship. These tests can be basically subdi- vided in bar pull-out tests [3-10], beam bending tests [6, 11-13], and direct ... See full document