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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 SUSTAINED COMPRESSIVE STRESS ON ULTRASONIC PULSE VELOCITY IN
           CONCRETE

    • Authors: Venkatachalapathy Venkitasamy, Sundaramoorthy E, Davy Herbert L
      Abstract: Objective of this study is to evaluate the effect of compressive stress over non destructive assessment of field concrete using ultrasonic pulse velocity (UPV). Influence of compressive stress on UPV for different concrete grades (M25, M30 & M40) tested at laboratory and at in-situ M40 reinforced concrete (RC) columns of 42m height of a high bay building is discussed. It is found that there is an increase in pulse velocity for concretes stressed around 5 Mpa, in addition to the growth in velocity due to curing period tested using cubes after 7, 14, and 28 days water curing. In the field study, pulse velocity versus computed stress due to the transmitted load during construction stages of the RC columns prove that  grow in velocity is significant with respect to acting stress, water to cement ratio and curing age. The results obtained from the study can be used as a reference for concrete ageing programs wherein pulse velocity based assessment is an important tool.
      PubDate: 2016-06-14
      Issue No: Vol. 7 (2016)
       
  • Evaluation of ductility index of a rectangular beam reinforced with rebars
           milled from scrap metal

    • Authors: joseph abah apeh, Godwin obumneme Okoli
      Abstract: The deflection ductility index of eighteen (100mm x 200mm x 1000mm) concrete beams reinforced with rebars milled from scrap metal is investigated. The load-deflection relatioapnship, first crack load, Ultimate load and deflection ductility index were assessed experimentally and analytically. Test results show the deflection ductility index in the range of 1.73 to 1.99 with flexural mode of failure. The analytical Load-deflection relationship compared with experimental values is in good agreement which suggests that the approach can be used to model the behaviour of concrete beams reinforced with rebars milled from scrap metal.
      PubDate: 2016-06-14
      Issue No: Vol. 7 (2016)
       
  • Monitoring Damage Evolution of Concrete Prisms under Cyclic Incremental
           Loading by Acoustic Emission

    • Authors: T.K. Haneef, V. Venkatachalapathy, Chandan Kumar Mukhopadhyay, Kalpana Kumari, B Purnachandra Rao
      Abstract: This study aims to monitor the damage growth of plain and fly ash concrete prisms with different curing periods under cyclic incremental loading using acoustic emission (AE) parameters. Higher flexural strength was observed for 28 days cured plain and fly ash concrete prisms as compared to 7 days cured. AE results for 7 days cured plain and fly ash concrete prisms have shown that, Kaiser effect exist in first two loading cycles and from third cycle onwards significant AE activity occurs prior to the previous cycle's maximum load. This is an indication of the start of damage almost at the same load in both the concretes. For 28 days cured fly ash concrete, AE activity during cyclic loading is observed only at 20 kN load as compared to plain concrete in which it occurs at 12 kN load. This shows that cyclic load flexural resistance of fly ash concrete for damage accumulation is higher than that of plain concrete. Load ratio of both types of concrete has been determined during each cycle. Decrease in trend of load ratio with loading cycle is an indication of damage growth. Higher load ratio in 28 days cured fly ash concrete shows addition of fly ash with extended curing which resists damage accumulation. An attempt has been made to classify damage levels during each cycles using NDIS 2421 standard and compared the types of damage in both plain and fly ash concretes.
      PubDate: 2016-06-14
      Issue No: Vol. 7 (2016)
       
 
 
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