[PDF] Top 20 Rev. IBRACON Estrut. Mater. vol.6 número4

... The IBRACON Structures and Materials Journal is releasing the fourth issue of the sixth volume. In this issue, eight articles are being published on signiicant topics of concrete structures and materials. The irst ... See full document

... In the accelerated corrosion essay modiied by immersion (CAIM), the electric current applied to the specimens induces the migra- tion of chlorides present in the solution toward the steel bar in- side the specimen. As a ... See full document

... Increases in the Young’s modulus values were observed at the ages 7 and 28 days of curing for the SW-PC paste, when com- pared to the reference paste. An increase in the modulus also was veriied by Almeida et al. [8] who ... 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

... 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

... demoulding, 6 test specimens of each type of concrete were kept in a moist chamber (wet cure), with temperature con- trolled at 23 ± 2 ºC and relative humidity (RH) greater than 95%, until the moment of mechanical ... 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

... and 6, table 1, noting up good agreement of results, igure 7. In case 6, the differences at 60 days and 3000 days were, exceptionally, the largest, reaching percentages about ...and 6%, respectively. ... See full document

... Such moments were determined by the equilibrium of forces, the only hypothesis of calculation of the program (equations 4 and 5 / igures 5 and 6). It is worth noting that the peak stress was considered in each one ... 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

... Although the mobile platforms processing capacity has in- creased during the last years, the image processing algorithm originally developed on PC software are still computationally more complex to be executed directly ... See full document

... Digital image processing is a technique which allows detecting dis- continuities in the image, i.e, points where sudden changes in the in- tensity level of the pixels occur. Therefore, detecting and measuring cracks on ... 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

... 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

... 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

... Brazilian standard NBR 7212 sets a time limit of 150 minutes for a concrete load to be discharged in full. In practice, situations arise where mixer trucks have to hold their load for much longer periods. The main aim of ... 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

... 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