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Articles by G. Dhinakaran
Total Records ( 9 ) for G. Dhinakaran
  G. Dhinakaran
  The Semicircular Breakwater (SBW) is a recently emerging topic, on which researchers are focusing considerable attention on its hydrodynamic performance characteristics worldwide, particularly, in Japan and China. The SBW has a semicircular-shaped hollow caisson founded on a rubble mound. It is cast as different elements and made of prestressed concrete. Since the caisson is hollow, its weight and the materials to be used are significantly less. The stability against sliding for SBW is good, since, the horizontal component of the wave force is smaller as compared to the vertical component; in addition, the vertical component is applied downward the curved wall. The SBW enhances the scenery compared to the conventional rubble mound breakwaters. Due to high stability against the wave action, it is expected that it can also serve well as offshore-detached breakwaters adopted for the protection of the coast against erosion. The different concepts of SBW are (1) the solid type in which case, its surface is impermeable; (2) the front wave dissipating type with seaside wall facing the waves being perforated; (3) the permeable type with its seaside and leeside walls being permeable and (4) the rear wave dissipating type with its leeside along being perforated. In this review paper, the results of detailed experimental investigations conducted by the author on hydrodynamic characteristics of SBW such as dimensionless hydrodynamic pressure, wave forces, reflection and transmission characteristics for surface piercing and submerged conditions are explained. The effects of perforations, water depth and rubble mound height are also explained.
  R. Vijaya Sarathy and G. Dhinakaran
  Concrete plays a very important role in infrastructure development like buildings, bridges and industrial structures etc. Long term performance of buildings without deterioration helps economies of nation. High Performance Concrete (HPC) is one which shows special performance than normal concrete. This necessitates use of mineral and chemical admixtures to improve concrete performance. In this study an attempt has been made to study strength and durability characteristics of M60 grade concrete by partial replacing natural sand and cement with ROBO Sand (crusher dust) and Ground Granulated Blast Furnace Slag (GGBFS), respectively. Experiments were conducted with different percentage replacements of sand of 40, 60 and 80% and cement of 40, 50 and 60% with ROBO sand and GGBFS, respectively. There were 16 combinations of mixes studied for its compressive strength and short term durability characteristics such as resistance against acid and sulphate attack. Finally, it was observed that the specimens with combination of GGBFS and ROBO sand for 40% had the optimum compressive strength and resistance against sulphate, acid attack as a result it can be concluded that replacement of cement and sand with GGBFS and ROBO sand improved the strength and resistance against sulphate and acid attack of the concrete compared to control concrete.
  B. Karthikeyan and G. Dhinakaran
  The present study explains elaborately the use of ground and unground micro-silica with concrete in 5, 10 and 15% as a partial substitute to cement and results were compared with conventional concrete. Micro-Silica was ground in ball mill using iron balls of 15 mm diameter and the sizes of the ground samples were checked after 4, 6 and 8 h of grinding by Particle Size Analyzer (PSA). Concrete specimens containing ground and unground micro-silica were cast in the laboratory and tested for compressive and tensile strengths at different ages of concrete. Permeability test was conducted after subjecting the specimens to 28 days curing. The morphology of the unground micro-silica and micro-silica ground for different time durations were analyzed using Scanning Electron Microscope (SEM). More irregular shapes were observed after 6 h of grinding so the grinding h were restricted to a maximum of 8 h. From the results it was observed that the specimens cast with micro-silica ground for 6 h, added 5% as a partial replacement for cement showed strength improvement up to 30% compared to the specimens cast with unground micro-silica. The resistance to permeability was also higher in concrete specimens cast using micro-silica ground for 6 h as a partial replacement for cement. So, it is inferred from the results that for an optimum grinding period of 6 h, ultra-fine micro-silica can be obtained. Optimum percentage of partial substitution for cement was found to be 5% in terms of strength and durability characteristics of concrete.
  A. Rajerajeswari , G. Dhinakaran and Mohamed Ershad
  The increasing worldwide production of cement to meet the future development in the infrastructure industry indicates the concrete is the most important ingredient in the modern construction materials. It is well evident that production of Ordinary Portland Cement (OPC) not only consumes larger quantity of natural resources but also emits larger quantity of carbon dioxide gas to the atmosphere. An effort has been taken to reduce the emission of carbon dioxide gas and also to produce an environment friendly material in the development of inorganic alumino silicate polymer called geopolymer, which is obtained from materials of geological origin or a byproduct materials such as fly ash, Silica fume, Ground Granulated Blast furnace Slag (GGBS) along with alkaline liquid. Geopolymer concrete (GPC) is a new innovative eco-friendly material which can be produced by partial replacement of cement in ordinary concrete by a mineral admixture such as Silica fume, Fly ash and Ground Granulated Blast furnace Slag along with alkaline liquid. In this study an attempt has been made to produce silica fume based geopolymer concrete and to find out its strength characteristics by considering the parameters such as ratio of alkaline liquid to silica fume, ratio of silicate to hydroxide and for different ages of geopolymer concrete with constant percentage of silica fume. The experiments were conducted to study the above mentioned parameters. From the results it is understood that with AL/SF = 0.25, SiO3/OH = 0.5, for thermal curing temperature of 60°C, for curing period of 56 days and 60% replacements of silica fume, yielded better compressive strength when compared to conventional concrete under normal curing. Hence use of silica fume based geopolymer concrete is recommended for construction.
  V. Rathinakumar , G. Dhinakaran , C.R. Suribabu and P. Velmurugan
  Air entrainment at the hydraulic structure is considered as one of the economical means of air-water transmission of atmospheric gases such as nitrogen and oxygen. The content of Dissolved Oxygen (DO) in the water helps to assess the quality of water. Enhancing the DO level in water course helps in the survival of terrestrial animals, fish and other aquatic organisms. More over, oxygen is needed for all algae, macrophytes and also for numerous chemical reactions that are vital for stream and lake functioning. Air-water transfer process can be administrated in the natural flowing channel by providing appropriate stepped cascade according to the site condition and availability of driving head for flow. The change in form of energy at the cascade and subsequent formation of turbulence in the flow at the immediate vicinity of downstream side of structure creates entrainment of air to water. This study describes the experimental investigation on the water aeration process at stepped cascade aerator with constant slope for different water quality flow. Large size stepped cascade aerator model is constructed in the laboratory to test its performance for three distinct qualities of water. The data is obtained for different step sizes by keeping slope as constant.
  P. Saravanakumar , G. Dhinakaran and K. Marimuthu
  Utilization of waste materials in concrete instead of natural raw materials and by reduces the environmental pollution and energy consumption becomes the emerging topic of sustainable development. This study presents the experimental study of the possibility of producing structural concrete with Recycled Aggregate (RA) and High Volume Fly Ash (HVFA). Four groups of mixes were cast and the fresh and hardened concrete properties of Recycled Aggregate Concrete (RAC) with and without Fly Ash (FA) were compared with Natural Aggregate Concrete (NAC) and optimum replacement of RA and FA were found. Four reinforced concrete beams were cast, out of which two beams were control concrete and the other two were with 50% of RA and 50% of FA and its load deflection characteristics and crack pattern also studied. From the experimental results, it was concluded that use of 50% RA and 50% FA replacements are encouraging for structural concrete.
  N. Chidambaram , J. Srikanth , B. Karthikeyan and G. Dhinakaran
  The chemical compositions of ceramic powder and micro silica were checked with XRF and were found to be satisfactory as both micro silica and ceramic powder possess chemical components related to cement. A high strength concrete of M50 grade was made using ceramic powder obtained from used or broken tiles at 4, 9 and 14% replacement levels and micro silica at 1%, both by weight of cement. The strength after 7 and 28 days curing were checked and was found that the blended concrete initially showed less strength but reached 65% of the desired mean strength. Control concrete strength was found to be more after 7 days curing. The blended concrete started showing increased strength at later age from the 28th day. Concrete with 9% ceramic powder and 1% micro silica showed better strength-increase from 7-28 days. It is understood that addition of ceramic powder and micro silica contributes to later age strength development. The microstructure of the concrete for various compositions were also checked using SEM and it was found that the C9+MS1% combination showed dense packing of concrete with the presence of C-H (Calcium-Hydroxide) which contributes to strength development.
  C. Venkatasubramanian and G. Dhinakaran
  Design of the various pavement layers is very much dependent on the strength of the sub-grade soil over which they are going to be laid. Sub-grade strength is mostly expressed in terms of CBR (California Bearing Ratio). Weaker sub-grade essentially requires thicker layers whereas stronger sub-grade goes well with thinner pavement layers. The pavement and the sub-grade mutually must sustain the traffic volume. The Indian Road Congress (IRC) encodes the exact design strategies of the pavement layers based upon the sub-grade strength which is primarily dependant on CBR value for a laboratory or field sample. For an engineer, it is always important to focus on optimal design of thickness of pavement which fulfills both strength and economy criteria. The strength of soil can be improved by suitably adding stabilizing agent resulting reduction in thickness of layer. Hence in the present study, three different soils with four different dosages for 2 and 4 weeks of period after application of bio-enzyme on its strength parameters were studied. It is inferred from the results that addition of bioenzyme significantly improve UCC and CBR values of selected samples.
  S. Gowrisankar , G. Dhinakaran and C. Antony Jeyasehar
  Corrosion of steel reinforcement in concrete structures is caused principally by carbon-dioxide, de-icing salts and seawater and is a multi-billion pound problem worldwide. A radically new method which has recently been evolved out is the use of Fiber Reinforced Polymer (FRP) re-bar as a substitute for conventional steel reinforcement. FRP re-bar are typically made up of either with aramid, glass or carbon fibers embedded in resin such as vinyl ester, polyester or epoxy. Since, the constituents of FRP re-bar are non-metallic, corrosion problem does not arise. Use of FRP re-bar as reinforcement has gained numerous advantages compared to the conventional reinforcement. Hence, an attempt has been made to study the effect of high strength flexural member reinforced with Glass Fiber Reinforce Polymer (GFRP) re-bar. In the present research, two high strength concrete beams of size 125x200x2100 mm have been considered. The concrete grade used is M 40. One beam is reinforced with GFRP re-bar and the other is with steel. Two point loading test was carried out and the failure characteristics were studied. The plots showing load-deflection curves at different sections of the beams and the moment carrying capacity were also developed. Thus, the study provides a clear picture of the performance of flexural member reinforced with GFRP re-bar and also provides a clear comparison with steel reinforced beam.
 
 
 
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