Behavioral Studies on Sorptivity of the Concrete Blended with Nano Silica
Optimization of Lane Based Signalized Intersections through VISSIM at Outer Ring Road Bengaluru
Trend Analysis of Rainfall Data using Mann-Kendall Test and Sen's Slope Estimator
A Review on Sustainable Utilization of Bauxite Residue (Red Mud) for the Production of Mortar and Concrete
A Critical Review of Experimental Research on the Durability of Cement Modified with Partial Steel Slag Replacement
Estimating the Soil Moisture Index using Normalized Difference Vegetation Index (NDVI) And Land Surface Temperature (LST) for Bidar and Kalaburagi District, Karnataka
Roughness Evaluation of Flexible Pavements Using Merlin and Total Station Equipment
Site Suitability Analysis for Solid Waste Dumping in Ranchi City, Jharkhand Using Remote Sensing and GIS Techniques
Unsaturated Seepage Modeling of Lined Canal Using SEEP/W
Strengthening and Rehabilitation of RC Beams with Openings Using CFRP
A Seasonal Autoregressive Model Of Vancouver Bicycle Traffic Using Weather Variables
Prediction of Compressive Strength of Concrete by Data-Driven Models
Predicting the 28 Days Compressive Strength of Concrete Using Artificial Neural Network
Measuring Compressive Strength of Puzzolan Concrete by Ultrasonic Pulse Velocity Method
Design and Analysis of Roller Compacted Concrete Pavements for Low Volume Roads in India
In order to improve the environmental friendliness of concrete industry, an attempt has been made with supplementary cementitous material for partial replacement of cement. Partial replacement of cement with Fly ash, GGBS and Microsilica made in Self compacting concrete, i.e Quaternary Blended Self Compacting Concrete (QBSCC) was done to a maximum extent of cement replacement. In the part of study of QBSCC properties, steel fibers are incorporated in Reinforced QBSCC to improve the flexural behavior and compared with the control self compacting concrete for different water binder ratios. The result shows that the flexural strength was improved in Fiber Reinforced QBSCC with control self compacting concrete.
Indian railway is regarded as the “Imperia In Imperio”, an empire within an empire. Indian Railway (IR) not only connects one part of the nation with the other, but also has the symbiotic relationship with country's industry and economy. Accidents in railway are very disastrous as they led to huge loss of life as well as public money. The present work deals with the investigation of causes of frequent and repeated accidents in Indian Railway. Regarding collision and derailment, it is found that conjestion in traffic, lower maintenance work, and over work load on railway staff are the leading cause. Regarding level crossing accidents, it is found that large number of unmanned crossing, lower pace of conversion drive and construction of ROB/RUBs are the reasons behind the repeated occurance. Regarding fire accidents, the major causes are passenger and pantry car originated. Beside these causes, it is also found that under investment by railway and mis-management by railway authorities regarding implementation of the proposed plan also add up as a cause for these railway accidents.
In today's modern world, the construction has made vast changes in design. Some of the utility and service ducts are important parts of modern building construction. Web openings in a beam adversely affect its strength and stiffness resulting in excessive deflections, which may lead to unpleasant appearance and collapse of the structure. Therefore, such beams are required to strengthen to restore their strength. The newly developed technique of jacketing the deficit beam with layers of Fiber Reinforced Polymer has proven to be very efficient in restoring and increasing the strength of the beam. The present work is to explore the behavior of rectangular RC beams with rectangular opening under torsion load. The torsional capacity of beams with opening is extracted experimentally. The study is extended by retrofitting the beams with four layers of bidirectional woven GFRP fabric applied by following orientation [0/90]2 . The restoring torsion capacity, crack patterns are observed and the strength has been increased by retrofitting.
The present experimental investigations are taken up to study the strength characteristics in ordinary grade concrete and standard grade of concrete with and without the addition of Bacteria Bacillus Subtilis. Based on earlier research works, 105 cells/ml concentration bacteria is selected. A technique is adopted in the formation of concrete by utilizing microbiologically induced calcite CaCO3 precipitation. Microbiologically Induced Calcite Precipitation (MICP) of Bacillus Subtilis is a common soil bacterium that can induce the precipitation of calcite. The present works deal with the bacterial concrete. M20 and M30 grades are chosen in this work, where the mix design is prepared by IS: 10262-2009. In this present research, 36 number of cubes, cylinders, and prisms are casted to get the performance of the bacterial concrete which is tested for compressive strength, split tensile strength, and flexural strength. Addition of bacteria shows increase in compressive strength, split tensile strength, and flexural strength. Experimental results on bacterial concrete show maximum increase in the mechanical properties, i.e. compressive strength, split tensile strength, and flexural strength for both M20 Grade & M30 Grade when 30% cement is partially replaced with fly ash and 30% fine aggregate is partially replaced with foundry sand. Bacteria concrete shows 36.5%, (ie) 29.79% increase in 28 days compressive strength when compared with normal concrete for M20 and M30 grades, respectively.
The destruction caused by an earthquake is highly unpredictable and sometimes beyond repair. Using Innovative methods of seismic analysis of structures, it is possible to minimize and reduce the effect caused by it. Earthquake resistant buildings can be designed and detailed so that they can withstand the seismic forces, but economics have restricted builders from using these new technologies. However, in recent years research plays an important on use of Seismic isolators, in which energy is limited by using energy absorbing or dissipating devices. Base isolation is an approach to earthquake-resistant design that is based on the concept of reducing the seismic demand rather than increasing the earthquake resistance capacity of structure. In this paper, the authors have discussed the overview of structure with and without base isolator and their effects using Elastomeric rubber bearing with the help of SAP 2000 version 12 using time history analysis by taking fundamental vibration period of 2s, 3s, and 4s for the soil conditions of rock and soft soil. In the analysis, effect of joint displacement and base shear on structure with and without isolator is discussed and compared.
Infrastructure plays a significant role in the economic development of the country. Most of the infrastructure projects are completed by Public Private Partnerships, of which build-operate-transfer (BOT) is one of the methods. The implementation process of a BOT project involves many parties, including the government, promoter, construction contractor, operating firms, financers, and other parties where dispute are likely to occur, which have to be resolved quickly, otherwise it will turn to be costly in terms of time and cost. Analysis shall be done on the possibility of implementing neural networks in resolution of disputes that arise during the construction phase. For this, various factors affecting the arousal of disputes will be identified and artificial neural networks will be implemented in network building. Different iterations will help to assess the effect of change in network parameters. Comparison of their results will give an optimum combination of parameters for effective resolution of disputes using neural network.
In the modern society of technology, construction of tall structures has been increased all over the world. Stability of the tall structure depends mainly upon the type of foundation. Combined piled raft foundation has been used throughout the world for several years to support tall structures as it has the advantages of both shallow foundation and deep foundation. Piled raft foundation is considered most economical. In this foundation system, the structural loads are carried partly by the raft and partly by the piles. This type of foundation system is considered as more effective because the raft is able to provide a reasonable measurement of both stiffness and load resistance. The method involves limit state design approach for designing a piled raft foundation for tall structures and requires three analyses like serviceability of the structure, overall stability of the structure, and analysis for obtaining foundation loads, moments, and shear forces for designing the foundation system. The concept of combined piled raft foundation usage is that it should be able to resist applied axial load with an appropriate factor of safety and at working load, the settlements of combined foundation should be limited. In case of poor soil conditions, grouting is done at the bottom of the pile which increases the bearing capacity of the soil, reduces the settlements and improves the properties of the soil. This paper describes the design principles of foundation, the approach for limit state design method, finite element method, and the concept of soil-structure interaction. Application of piled raft foundation system is explained with the help of a case study. It is opined that the piled raft foundation system can be effectively adopted for construction of tall structures.
