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Concrete Research Letters
   [3 followers]  Follow    
  This is an Open Access Journal Open Access journal
     ISSN (Print) 2180-1371
     Published by ISSR Journals Homepage  [3 journals]
  • An Experimental Study on Mesh-and-Fiber Reinforced Cementitious Composites

    • Authors: Sakthivel P.B., A. Ravichandran, N. Alagumurthi
      Abstract: Development of new composite materials which reduces the large consumption of natural resources is an approach towards sustainability. This study is an attempt to explore the possibility of adding polyolefin fibers (PL-F) in steel mesh reinforced cementitious composites (SMRCC) and conduct low velocity impact tests. For this purpose, test specimens of slab size 250 X 250 X 25 mm (thickness) were cast with steel mesh (3 to 5 layers) and polyolefin fibers (0.5-2.5% of  volume of specimens with 0.5% interval) and compared with control specimens (cast with steel mesh of 3 to 5 layers). Statistical t-tests were employed to find out the paired difference in impact energy absorption capacity between initial impact energy absorption (IIEA) and ultimate impact energy absorption (UIEA). Also, through statistical analysis, it was found that when steel mesh layers were varied keeping fiber percentage constant, and vice-versa, there were significant differences in the energy absorption capacity of cementitious slabs. 
      PubDate: 2014-03-06
      Issue No: Vol. 5 (2014)
       
  • Strengthening of Concrete Beams Using FRP Composites

    • Authors: Ahmed A. Elshafey, Medhat Mohammed, Mostafa M. El-Shami, Kamel S. Kandil
      Abstract: Finite element analysis (FEA) is used to predict the behavior of reinforced concrete beams strengthened with fiber reinforced polymer (FRP). To verify and measure the accuracy of the FEM model, the current model results were compared with both experimental and theoretical available results. Four beams were studied simulating the Horsetail Creek Bridge, Oregon, USA. The first one is a control beam with no strengthening fiber. The second beam is strengthened with carbon fiber reinforced polymer (CFRP) oriented along the length of the beam to reinforce the flexure behavior. The third beam is wrapped with glass fiber reinforced polymer (GFRP) laminates representing the shear beam. The fourth one is strengthened with CFRP and GFRP laminates representing the flexure-shear beam. The load-strain for concrete, steel and fiber as well were represented and compared. In addition, the load deflection curves and crack patterns were developed and represented. The results showed that the modeling process was accurate in simulating the tested beams. It was also clear that using FRP in strengthening reinforced concrete beams is an effective method in improving both shear and flexural behavior of the beams.
      PubDate: 2014-03-06
      Issue No: Vol. 5 (2014)
       
  • Non-delayed heat application effects on the strength of concrete for
           railway sleepers

    • Authors: Rasiah Sriravindrarajah, Stephen R. White
      Abstract: Precast concrete sleepers production requires the application of low-pressure steam curing to accelerate the early age strength development. In this curing process, heat is gradually applied to the sleepers after 2 hours from casting. A typical production specification for concrete sleepers limits the rate of temperature rise to 24oC per hour and the maximum temperature to 70oC. However, it is not usual to consider heat application immediately after casting to achieve improved productivity to meet the supply demand. This paper reports the results of an experimental investigation into the effect of non-delayed heat application on the early age and later age compressive strength for the typical concrete mixes used for the production of concrete sleepers in Australia. The mixes had either ordinary Portland cement or high early-age strength Portland cement with the low calcium fly ash as binder materials. The results showed that the compressive strength after 8 hours and 28 days were significantly reduced when non-delayed heat application was carried out. Delayed ettringite formation (DEF) could be one of the reasons for the strength reductions and a delayed period up to 4 hours is beneficial in controlling the strength loss. 
      PubDate: 2014-03-06
      Issue No: Vol. 5 (2014)
       
 
 
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