[PDF] Top 20 Rev. IBRACON Estrut. Mater. vol.6 número3

... We are now releasing the June 2013 issue of IBRACON Structures and Materials Journal (Volume 6, Number 3). This issue contains eight articles on remarkable topics of concrete materials and struc- tures. The ... 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

... 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

... 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

... 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

... 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

... Chemical composition and LOI of the residues are shown in Table 2. RHA shows high content of silica, thus corroborating the analy- sis presented by others researchers (Krishnaro [18], Bui [19]). Po- tassium content was ... See full document

... Test data was compared to results obtained from the matrix analysis program Sistema Computacional TQS v11.0 and from the inite element model program SAP2000 v14.2.2.. Slab behavior was [r] ... 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

... The μ-CT is an imaging technique that allows for the gathering of three-dimensional data on the internal microstructure of materials (such as density, pore structure and porosity), which does not re- quire the special ... See full document

... The results of the tests on the compressive strength of the small walls in relation to the gross area (f pp ) are shown in Table 6. Note that no signiicant change in the compressive strength of the small walls was ... See full document

... In order to verify the numerical model an experimental program was carried on. It consisted on the testing of two series of hol- low core slabs. Each series had three specimens. In series 1, the hollow core slabs were ... See full document

... ABNT NBR 7480 (1996) [2]. In Figure 3, the dimensions of the joists are illustrated according to the ABNT NBR 14862 (2002) [3]. Joists are indicated by a code TR, followed by ive digits: the irst two represent the height ... See full document

... Four pastes with water-cementitious materials ratio of 0.47 and dif- ferent contents of replacement cement mass were designated as follows: reference paste with cement and water (RF-PC); paste with 10% cement replacement ... 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

... 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

... 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

... 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

... 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