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Journal Cover   Concrete Research Letters
  [2 followers]  Follow
    
  This is an Open Access Journal Open Access journal
   ISSN (Print) 2180-1371
   Published by ISSR Journals Homepage  [3 journals]
  • Influence of material properties of reinforced concrete element on
           acoustic emission due to corrosion.

    • Authors: Shilpa Vishal Patil
      Abstract: The material properties of reinforce concrete (RC) influence the corrosion process of steel rebar and subsequent cracking of concrete. This paper investigates the influence of material properties on acoustic emission (AE) due to corrosion of rebar in concrete. RC cylinders with various cover thickness to rebar diameter ratios (C/D), cement types and steel types were studied to identify their influence on cumulative signal strength (CSS) of AE technique. The result of analysis of variance (ANOVA) indicated significant effect of steel type on CSS values due to corrosion followed by cement type, whereas C/D has no significant effect.
      PubDate: 2015-04-05
      Issue No: Vol. 6 (2015)
       
  • Designing, Proposing and Comparing the Methods Predicting the Compressive
           Strength of the Ferro cement Mortar

    • Authors: Hamid Eskandari
      Abstract: Ferro cement is a commonly used type of concrete. As the Ferro cement mortar is one of its components, and different parameters affect its compressive strength, prediction of the compressive strength of Ferro cement mortar before construction can seriously affect its properties and costs. In this study, DIN and ACI methods were used to examine the mix design of Ferro cement mortar. To this end, an equation was proposed for prediction of a 28-day strength based on the weight of cement, water, fine aggregate, nano silica, micro silica, and slump value. Results of previous researcher in this regard were evaluated to verify the equation and the designed mix designs. Results showed that the prediction based on the proposed equation had more favorable standard deviation and less error than did other equations and statistical methods besides its applicability for the mix design of all types of cement mortars.
      PubDate: 2015-04-05
      Issue No: Vol. 6 (2015)
       
  • Seismic behaviour of Multistorey RC Frames with vertical mass
           irregularities

    • Authors: s Varadharajan, V K Sehgal, B Saini
      Abstract: The buildings with mass irregularity behave differently as compared to regular buildings. In the present study, a parameter called mass irregularity index has been proposed to quantify the mass irregularity. The proposed factor depends mainly upon magnitude and location of mass irregularity. Further the present study aims to modify the expression of time period proposed by IS 1893:2002 and relation between mass irregularity coefficient and time period has been evaluated. For present study a family of 108 frames with mass irregularity have been modelled and analyzed by time history analysis. The proposed expression for time period has been validated for buildings with mass irregularity.    
      PubDate: 2015-04-05
      Issue No: Vol. 6 (2015)
       
  • Influence of Bentonite Content on the Compressibility Parameters of
           Processed Sand-Bentonite Mixtures

    • Authors: ADHAM ABD EL RAZIK EL ALFY
      Abstract: Bentonite has employed by industry to exercise various structural applications due to its unique properties especially when the material is transferred to a liquid state under water. Swelling property of bentonite to produce various water suspensions, which depends upon the relative constituents of clay and water. These mixtures are employed as bonding and plasticizing agents. Bentonite provides a large surface areas per unit weight of clay, due to its large surface area in stabilizing the medium to carry other chemicals. Bentonite react chemically with many organic material to form compounds which are used as a gelling agents in a variety of organic liquids.                 One-dimensional consolidation tests are performed on four sand-bentonite mixtures containing 10, 20, 30 and 40 % by dry weight bentonite to study the 1-D compressibility behavior of compacted sand-bentonite mixtures. These speciments are mixed at wet of optimum water content. To overcome the problem of the high tendency of bentonite to swell, two techniques are used. The first one is following the consolidation-swel test procedure by Nelson and Miller and the other one is mixing the soil at water content equivalent to liquid limit. The water contents for these tests are chosen in an attempt to achieve the same initial void ratio of 0.71 for all bentonite contents. Finally, final conclusion is mentioned for the effect of bentonit content on the compressibility parameters of sand-bentonite mixtures. This research arrived to that the initial water content has no effect on the mixture, which contains 10 percent bentonite, whereas a significant effect is noticed for 20 and 30 % bentonite mixtures. It was found that for mixtures containing 20 and 30 % bentonite, the compressibility parameters, Cc, Cs, av, and mv for the specimens mixed at liquid limit are higher than those for specimens mixed wet of wopt.
      PubDate: 2015-04-05
      Issue No: Vol. 6 (2015)
       
 
 
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