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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]
  • Effect of Flyash and Waste Rubber on Properties of Concrete composite

    • Authors: Anu Bala, V. K. Sehgal, Babita Saini
      Abstract: Increasing use of waste materials like flyash, scrap tyre rubber etc, in construction industry has reduced the handling and disposal problems of these wastes. Flyash and scrap tyre rubbers are generally, employed to develop light weight and low strength concrete composites. The present work discusses the influence of flyash and waste tyre rubber particles on the behaviour of concrete composite. The rubber content has been taken in the range of 0 to 40% as replacement of fine and coarse aggregates while the flyash has been varied from 0 to 30% for cement. Testing of the concrete specimen prepared under different percentage of flyash and rubber waste was performed at 28 days of age for workability, density, compressive and bond strength. Experimental results show that the density, compressive strength and bond strength decreases while workability increases with increasing rubber content. Addition of flyash also decreases the density and compressive strength.
      PubDate: 2014-09-13
      Issue No: Vol. 5 (2014)
       
  • Load-deflection Analysis of CFRP Strengthened RC Slab Using Focused
           Feed-forward Time Delay Neural Network

    • Authors: Seyedvahid - Razavitosee, M. Z. Jumaat, 3Ahmed H EI-Shafie
      Abstract: In this paper, the load-deflection analysis of the Carbon Fiber Reinforced Polymer (CFRP) strengthened Reinforced Concrete (RC) slab using Focused Feed-forward Time Delay Neural Network (FFTDNN) is investigated. Six reinforced concrete slabs having dimension 1800×400×120 mm with similar steel bar of 2T10 and strengthened using different length and width of CFRP were tested and compared with similar samples without CFRP. The experimental load-deflection results were uploaded, normalized, and converted to a time sequence parameter in MATLAB software. Loading, time, and the effect of the different CFRP strip lengths on the slab moment of inertia were as neurons in input layer and mid-span deflection was as neuron in output layer. The network was generated using feed-forward network and a tapped delay line at the input layer to memorize the input data while training process. From 122 load-deflection data, 111 data utilized for network generation and 11 data for the network testing. The results of model on the testing stage showed that the generated FFTDNN predicted the load-deflection analysis of the slabs in acceptable technique with a correlation of determination of 0.98. The ratio between predicted deflection by FFTDNN and experimental output was in the range of 0.92 to 1.23.
      PubDate: 2014-09-13
      Issue No: Vol. 5 (2014)
       
  • Thermal Cracking Of Concrete Pile Caps

    • Authors: José Milton de Araújo
      Abstract: The large pile caps of buildings and bridges may have superficial cracks already in the early hours after concreting. Due to the large volume of concrete, the temperature inside the pile cap may reach very high values, as a result of the heat of hydration of cement. Because of the strong temperature gradients, the surface of the pile cap is tensioned and may crack. The employment of skin reinforcement does not avoid the cracking of concrete. However, this reinforcement may reduce the crack width, providing the onset of a large number of small cracks, instead of a single crack with large opening. The object of this work is to address this issue by analyzing the main variables involved and suggest a design methodology for the calculation of skin reinforcement of concrete pile caps.
      PubDate: 2014-09-13
      Issue No: Vol. 5 (2014)
       
 
 
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