|1||A Study On Strength And Stress Strain Behaviour Of Self Curing Concrete||1.Abdul Altaf, 2.K Praveen||
Curing cement is the process of retaining moisture in the concrete throughout its early stages, notably during the first 28 days after placement, in order to achieve the desired qualities. Relieving concrete has a significant role in the formation of the solid microstructure and pore structure. When compared to conventional cement, the goal of self-relieving is to reduce water dissipation from concrete and therefore increase the solid's water maintenance limit. Without a doubt, ill-advised restoration may degrade the quality of cement. It has been established that using water-dissolvable polymers as admixtures in solids has an influence on the qualitative features of solid relieving of cement. Solid relieving of cement plays a significant role in building up the solid small-scale structure, which improves its solidness and execution. As an inner restoring specialist, super absorbent polymer (SAP) is used.
SAP is a collection of polymeric materials that can soak up and absorb a lot of water from their surroundings while also holding the water in their structure without causing it to dissolve. In this study, M20, M30, and M40 self-restoring concrete assessments with blending SAP0.2, 0.40, 0.6, 0.80, and 1.0 rates were used in this study. When SAP is used in self-restoring concrete, the compressive strength is not compromised. When SAP is used in self-curing concrete, the split elasticity is not reduced. The SAP can be used on the bond weight up to 0.6 percent without compromising the distinct cement quality.
|2||Analysis Of Brushless DC Motor Drive Using Cascade H-Bridge Inverter Topology||1.Badisa Sreenu, 2.Jibilikapally Suman||
In this paper the output of a brushless DC motor drive supplied by a five-level inverter is analysed and explained. A cascaded H-Bridge inverter architecture was chosen for the research because of its many advantages. The simulation model of the brushless DC motor is produced using the brushless DC motor's mathematical model. The whole model of the inverter-fed drive is simulated in MATLAB/SIMULINK. Waveforms depict the inverter output voltage, engine torque, back EMF, and harmonic analysis of the inverter voltage. The output voltage of a five-level inverter is of excellent quality. When supplied by a five-level inverter, the efficiency of BLDC is high, according to the simulation study.
|3||Torque Ripple Reduction In BLDC Motor By A Novel Method||1.V Navya , 2.B Shankar||
Brushless DC motors are gaining a lot of popularity due to the several advantages of the motor. This motor has mainly attracted the designers of electric vehicle systems and other industrial applications. This motor is commercially obtaining demand due to its high torque density. Even though the magnitude of the torque is high in the BLDC motor, there are some problems still associated with its performance.
One of the significant drawbacks of the BLDC motor is the presence of ripples in the torque waveform. The drives, aerospace, and other machine tools require shallow ripples in torque waveform. This will decrease the average value of the torque obtained by the BLDC motor. This is a very challenging problem in the current research trends.
In this paper, the primary focus is on the torque ripple minimization in the BLDC motor using modern/novel techniques. The technique presented in this work will considerably reduce the ripples in the torque waveform of the BLDC motor. Entire work is done in the MATLAB/SIMULINK software. The mathematical model of the BLDC motor is used to analyze the torque ripples presented in the waveform. The simulation waveforms of the torque waveform are shown in the results.
|4||Experimental Evaluation Of M35 Grade Conventional Concrete By Supplementing Natural Fibers, Foundry Sand And Sea Sand As Partial Replacements||1.Shaik Mohammed Sohail, 2.Jugal Kishore||
Present urbanization required a huge variety of concretes and minimized effects of newly developed composite materials. This development leads to adverse effects on the surrounding environment. As a part of environmental concern, we have to minimize the negative effects. The use of fine aggregate in the construction industry is more. Therefore, the use of river sand can be replaced with other materials to protect the environment of the river as well as prevent erosion and flood, in My present research paper is similar to this, based on the recycling technique I used to do materials replacements of natural fibers and waste foundry sand & sea sand are the major partial replacements of fine aggregate and grade of concrete are M-35. After the preparation of M-35 Grade concrete, it should be validated with conventional concrete. The major tests are conducted on M-35 grade hardened concrete, which are Concrete cube tests, Cylinder Test & flexural tests. After the test results are verified with referenced documents and satisfactory results are obtained, the complete discussions and results are listed separately in further chapters.
|5||Optimization Of The Effective Location Of Reinforced Shear Wall For High Rise RCC Structure (G+19)||1.kavya Kodali, 2.Dr.C.Ravi Kumar Reddy||
Diagrid structures have been prevalently used for tall buildings worldwide due to their structural efficiency and aesthetic potential. The key concern of tall building design is controlling deflections under lateral loads. There are many structural forms to resist lateral loads; the diagrid structural system is one of the effective solutions in mitigating seismic responses of core-tube-type tall buildings. Since the diagonal angle of the diagrid structure enormously influences the adequacy of the diagrid as far as the lateral strength at the highest point of the tall structure, the present research is focused on the determination of optimal angle of the diagrid structures and the behaviour of diagrids on various seismic responses with different aspect ratios by fixing the plan of the building in all zones and medium soil type in India.
This study focuses on the determination of optimum diagonal angle of the steel diagrid structure for greater resistance to lateral loads depending upon the aspect ratio of the buildings. The results have shown that the diagrid structures with the uniform diagonal angle between 50° to 70° seemed to be the most efficient in resisting lateral loads as well as gravity loads for aspect ratio of building models between 1.6-0.55 and diagrid structures showed effective results than regular conventional type building in all zones in India. Finally, the research is concluded with the optimum angle of complete module diagrid structures with uniform diagonal angle of different aspect ratios. Further research is needed for the behaviour of incomplete module diagrid structural system in tall buildings as the number of storeys directly depend upon the primary module height.
|6||Strength Characteristics Of Fibrous Concrete||1.Shaik Jani Begum, 2.P. Siva Sankar,3.Dr C Ravi Kumar Reddy||
Concrete is an important construction material used in our daily life. Industrial by-products (fly ash) have become burden for disposal. In this study, two grades of concrete namely M30 and M50 have been investigated for plain and fiber reinforced concrete. Compressive and split tensile strength tests were performed with different aspect ratios of corrugated steel fibres of two lengths 2cm, 4 cm and three percentages of fibers 0.5,1, 1.5 by volume of concrete. The water cement ratios used was 0.45. The main objective of this study is to study the behavior of plain and Fibre reinforced concrete at different aspect ratios and at different volume fractions of steel fibres. The effect of fibres on strength properties of concrete at different temperatures is highlighted in this research to analyze the behavior of concrete.
By the addition of 1.5% by weight, steel fiber reinforced concrete showed a better overall residual strength and better crack resistance than non-fibrous concrete. The carbonation process for concrete with steel fiber is a little influenced by temperature compared to concrete without steel Fibre. Researchers has done extensive work on replacing cement with mineral admixtures in concrete obtained results by adding these mineral admixtures as substitute of cement decreases the emission of carbon dioxide in concrete. When the concrete is subjected to fire, the performance of concrete is evaluated in terms of compressive strength, flexural strength and density. In this study the mechanical properties of concrete were studied. Engineering structures in the city environment surrounded with combustible materials are prone to be in the danger of combined effects of blast-induced impact loading and fire. Steel-fiber reinforced concrete (SFRC) beams were tested after pre-impact loading to explore their fire-resistance. The beams were first subjected to impact loadings and then exposed to fire with a constant load.