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Concrete Research Letters
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  This is an Open Access Journal Open Access journal
     ISSN (Print) 2180-1371
     Published by ISSR Journals Homepage  [3 journals]
  • Properties Of Concrete By Using Bagasse Ash And Recycle Aggregate

    • Authors: Md. Habibur Rahman Sobuz, Noor Md. Sadiqul Hasan, Nafisa Tamanna, Mohamed Slah Talha, Md. Saiful Islam
      Abstract: Sustainable concrete structures which imply green building technology has been widely considering in modern structures. The objective of this study is to investigate the concrete properties by using recycle aggregate as a replacement of coarse aggregate and bagasse ash as the partial replacement of cement. Experimental investigation has been carried out by performing several tests which included slump test, compacting factor test, compressive strength test, rebound hammer test and concrete density test. A total of nine mix batches of concrete containing 0%, 25%, 50%, 75% and 100% of recycle aggregate and 0%, 10%, 15% and 20% of bagasse ash were tested to determine the increment of mechanical properties of concrete. It can be observed that significant decrease of concrete strength with the addition of recycle aggregate, and effective increment of concrete strength by using optimum percentage of bagasse ash might be possible. Finally, it can be concluded that recycle aggregate and bagasse ash with optimum percentage can be used to make recycle concrete and sustainable structures.
      PubDate: 2014-06-23
      Issue No: Vol. 5 (2014)
       
  • Characterization of Calcium Hydroxide (CH) crystals in Nano Modified
           Binder (NMB)

    • Authors: Norsuzailina Mohamed Sutan, Ibrahim Yakub, Sinin Hamdan, Chuo Sin Kiong
      Abstract:   Abstract   With the advent of nanotechnology, such nano scale materials have been developed for the application in binding material namely cement.A new synthetic material, namely Nano-SiO2(nS), has been produced and available in the market. It is based on silica particles of 5-50 nm which is much smaller than those of silica fume (microsilica) with particles of 0.1-1 μm. Previous studies have shown that due to the very high specific surface area (80-1000 m2/g) and the spherical shape of silica particles,it can potentially enhance the performance of cement mainly due to its reaction with calcium hydroxide (CH) to develop more of the strength-carrying compound in cement structure namely calcium silica hydrate (C-S-H). This reaction namely pozzolanic reaction is crucial in the mitigation of efflorescence by its relation to CH leaching. The early hydration behaviour of a Nano Modified Binder (NMB) that hypothetically affects efflorescence has been investigated through physicochemical characterization namely Puddle Test (PT), Standard Chemical Method (SCM), Compressive Strength Test (CS), X-Ray Diffraction (XRD) and Scanning Electron Microscopy (SEM). NMB mortar samples were prepared with water-to-cement ratio (w/c) of 0.50. nS of 10-20 nm particle size was used as 2%, 3% and 5% replacement of cement by weight. Samples were cured at room temperature (32o C) and average relative humidity (90%). Powdered and polished samples were prepared and tested at 28 days of binder hydration. Results from CS, XRD analysis and SEM images show that compare to conventional binder, NMB exhibited a lesser efflorescence where validation from CS, XRD analysis and SEM images show the evidence of the pozzolanic reaction.     Keywords: Nano-SiO2 ; Efflorescence ;pozzolanic; XRD ;SEM
      PubDate: 2014-06-23
      Issue No: Vol. 5 (2014)
       
  • FLEXURAL BEHAVIOR OF RC BEAMS WITH OPENING

    • Authors: saeed ahmed alsheikh
      Abstract: Providing an opening in beam develops cracks around the opening due to stress concentration. In this paper an experimental works conducted to study the behavior of RC beam with different shapes of opening with varying diameters at different locations. This paper presents the behavior of RC beam with opening unstrengthened by additional reinforcement. In this experimental study 27 beams were casted, one beam without opening as a control beam and the remaining beams were provided with opening. These beams were tested under four-point loading. The effect of size of opening with different locations was studied in terms of ultimate failure load, maximum deflection and failure mode. From the test results, it could be concluded that the ultimate load carrying capacity of the RC beam at shear zone with opening was maximum reduction but at flexure zone showed minimum reduction. Rectangular opening increased the ultimate load reduction than square opening by (4%), while the circular opening reduced the ultimate load reduction than square opening by (8%).
      PubDate: 2014-06-23
      Issue No: Vol. 5 (2014)
       
  • EFFECT OF CURING METHODS AND ENVIRON ON PROPERTIES OF CONCRETE

    • Authors: preetha rajappan, G.V.V.S.R. Kishore, C. Sundaramurthy, C. Sivathanu Pillai, A.K. Laharia
      Abstract: The paper presents the effect of three different curing methods i.e. water curing, sealed curing , air curing and curing periods on  different concrete mixes on hardened properties of fly ash concrete and ordinary cement concrete at different regions in India in varied conditions of temperature, humidity and wind. The results showed that the strength of water & sealed cured samples are comparable. The behaviour of concrete against improper curing  is same for concrete with and without flyash. The relative values of Rapid Chloride Penetration Test (RCPT) are lowest for water cured samples but no correlation could be established on absolute values. For a given  design mix when range of temperature variation during curing period is high, effect is seen in compressive strength and  when a humidity variation is high, effect is seen in RCPT values.
      PubDate: 2014-06-23
      Issue No: Vol. 5 (2014)
       
 
 
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