Papers by lakshmi VARAPRASAD
International Journal of Earth Sciences and Engineering
ABSTRACT
Advances in Intelligent Systems and Computing, 2018
This paper investigates the applicability of artificial neural network model for strength predict... more This paper investigates the applicability of artificial neural network model for strength prediction of fibers’ self-compacting concrete under compression. The available 99 experimental data samples of fibers self-compacting concrete were used in this research work. In this paper, computational-based research is carried for predicting the strength of concrete under compression and model was developed using ANN with five input nodes and feed-forward three-layer back-propagation neural networks with ten hidden nodes were examined using learning algorithm. ANN model proposed analytically was verified, and it gives more compatible results. Hence, the ANN model is proposed to predict the strength of fibrous self-compacting concrete under compression.
Herein, a box girder bridge, prepared using self-compacting concrete (SCC), is studied to underst... more Herein, a box girder bridge, prepared using self-compacting concrete (SCC), is studied to understand its behaviour during an earthquake. The bridge under consideration was constructed by PWD, Silchar with normal M40 grade concrete. The concrete type is ancient for the structure category at present and there is need for a new concrete material to be used which will improve the performance of bridges. In our present endeavour, practically used concrete was replaced with new SCC to examine the performance using pushover analysis. For this, a three dimensional finite element model was prepared and all the load combinations were evaluated including critical load case. For seismic investigation, pushover analysis was performed with respect to the Indian Standard response spectrum to examine the displacement pattern, base shear capacity and demand-capacity behaviour of the bridge piers in longitudinal and transverse direction. The results shows that performance of the bridge is enhanced in...
AIP Conference Proceedings, 2018
A review was done on Magnesium (Mg) based composite materials reinforced with different nano part... more A review was done on Magnesium (Mg) based composite materials reinforced with different nano particles such as TiO2, Cu, Y2O3, SiC, ZrO2 and Al2O3. TiO2 and Al2O3 nanoparticles were synthesised by melt deposition process. Cu, Y2O3, SiC and ZrO2 nanoparticles were synthesised by powder metallurgy process. Composite microstructural characteristics shows that the nano-size reinforcements are uniformly distributed in the composite matrix and also minimum porosity with solid interfacial integrity. The mechanical properties showed yield strength improvement by 0.2 percentage and Ultimate tensile strength (UTS) was also improved for all the nano-particles. But UTS was adversely affected with TiO2 reinforcement while ductility was increased. With Cu reinforcement elastic modulus, hardness and fracture resistance increased and improved the co-efficient of thermal expansion (CTE) of Mg based matrix. By Y2O3 reinforcement hardness, fracture resistance was improved and ductility reached maximum by 0.22 volume percent...
Key Engineering Materials, 2019
Concrete is the most important building material in construction industry because of its revoluti... more Concrete is the most important building material in construction industry because of its revolutionary property of quick hardening and free from internal problems. Its use has a great effect on environment due to the large amount of natural resources and cement lime materials required for manufacture the concrete structures. Now it’s the time for think in the direction of Eco-friendly durable materials in concrete production. In the present work, Quarry Dust and Foundry Sand are partial replaced River Sand to develop Rheological and Durability properties of M40 grade of Eco-Efficient Self-Compacting Concrete (ESCC). The target strength could be achieved satisfying the rheological properties of Eco-Efficient Self-Compacting Concrete with fiber additions. In this study investigations carried to find the Permeability, Shrinkage, Acid attack and Rapid Chloride Permeability Test (RCPT) of Eco-Efficient Fiber based Self-Compacting Concrete and it is observed that it is no way inferior to ...
AIP Conference Proceedings, 2018
A review was done on Magnesium (Mg) based composite materials reinforced with different nano part... more A review was done on Magnesium (Mg) based composite materials reinforced with different nano particles such as TiO2, Cu, Y2O3, SiC, ZrO2 and Al2O3. TiO2 and Al2O3 nanoparticles were synthesised by melt deposition process. Cu, Y2O3, SiC and ZrO2 nanoparticles were synthesised by powder metallurgy process. Composite microstructural characteristics shows that the nano-size reinforcements are uniformly distributed in the composite matrix and also minimum porosity with solid interfacial integrity. The mechanical properties showed yield strength improvement by 0.2 percentage and Ultimate tensile strength (UTS) was also improved for all the nano-particles. But UTS was adversely affected with TiO2 reinforcement while ductility was increased. With Cu reinforcement elastic modulus, hardness and fracture resistance increased and improved the coefficient of thermal expansion (CTE) of Mg based matrix. By Y2O3 reinforcement hardness, fracture resistance was improved and ductility reached maximum by 0.22 volume percentage of Y2O3 and decreased with succeeding increase in Y2O3 reinforcement. The readings exposed that mechanical properties were gathered from the composite comprising 2.0 weight percentage of Y2O3. Ductility and fracture resistance increased with ZrO2 reinforcement in Mg matrix. Using Al2O3 as reinforcement in Mg composite matrix hardness, elastic modulus and ductility was increased but porosity reduced with well interfacial integrity. Dissipation of energy in the form of damping capacity was resolved by classical vibration theory. The result showed that an increasing up to 0.4 volume percentage alumina content increases the damping capacity up to 34 percent. In another sample, addition of 2 weight percentage nano-Al2O3 particles showed big possibility in reducing CTE from 27.9-25.9×10 6 K 1 in Magnesium, tensile and yield strength amplified by 40MPa. In another test, Mg/1.1Al2O3 nanocomposite was manufactured by solidification process followed by hot extrusion. Results showed that strengthening effect was maintained up to 150 C and fracture characteristics of Mg composite transformed from brittle to mixed ductile mode and fully ductile in attendance of nano-Al2O3 particulates.
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Papers by lakshmi VARAPRASAD