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
A major challenge for concrete in today’s engineering is to build structures with lowest possible life cycle cost for sustainability. One of the major problems with reinforced concrete structures is the corrosion of steel reinforcement. It is one of the primary causes of premature deterioration of RCC (Reinforced Cement concrete) structures. The damage caused by corrosion seriously limits the service life of many concrete structures. The cost to rehabilitate these deteriorated concrete structures is expensive. As a result, over the past two decades, extensive research has been conducted to improve the durability of existing and new concrete reinforced structures. Plain concrete is a brittle material, with low tensile strength and strain capacities. To help overcome these problems, there has been a steady increase over the past years in the use of fibre reinforced cements and concretes (FRC). In general, the most important advantage of adopting Steel Fiber Reinforced Concrete (SFRC) is the increase of tensile strength, enhancement of toughness and increased resistance to crack propagation with the help of stress transfer from the matrix to the fibres. Addition of fibres has also shown modest increase in compressive strength. FRC thus exhibits strain hardening behaviour after first cracking as well as improvement in energy absorption capacity. Reduction of cracks shall increase initiation period of corrosion of reinforcement in RCC by many years, thereby increasing durability and reducing service life cost of the structure
Development of an adequate network of roads, especially in remote rural areas is of vital importance for the socioeconomic development of a country. Search is being made to find alternative materials, for use in pavement construction. Fly ash, lime and cement are the commonly used materials for soil stabilization. Geosynthetics, Geotextiles and Geo-grids are also used nowadays in roads for subgrade improvement in road construction. This paper presents the laboratory CBR test results conducted on sandy soil mix with fly ash for unreinforced and reinforced cases. The reinforcement was done using geogrids in layers at different depths in CBR mould. The fly ash was varied from 15% to 35% in sand sample. All the tests were conducted at Optimum moisture content (OMC) and maximum dry density (MDD) of mixes. The results of California Bearing Ratio (CBR) tests have shown considerable improvement with the use of reinforcement. The maximum increase in CBR value with Geo- grid was observed with the 2 layers of Geo-grid use. The increase in value of CBR was from 6% for virgin soil to 13% with use of geogrids.
Soft soils need to be improved to make them suitable for construction. Granular Piles (GP) are effective and economical solutions to improve the behavior of the soft soil by increasing bearing capacity, reducing settlements due to reinforcement. Granular piles due to their inherent advantage are effective in countering swell pressures from expansive clays. Installation process of GPs densifies the ground adjacent to GPs inducing additional benefit. Advantages of GP to resist compressive and shear loads are well documented and attempts to extend its utility to resist tensile loads is being investigated. An anchor is placed at the base of granular pile and attached to the footing by a cable or rod which transfers applied pullout force to the bottom of GP. Such an assembly is termed as 'Granular Pile Anchor' (GPA). Experimental study on laboratory models of GPA in clayey sand for different compaction properties lead to different undrained shear strength and stress – strain characteristics. Pullout resistance derived from pile capacity is mainly affected due to the variation in undrained shear strength with depth. Results are presented as variations of load – displacement responses and failure patterns for three different undrained shear strength values.
Foundations of several civil engineering structures are required to be designed as anchor foundations. The analysis and design of deep anchors in clays are considered by very few researchers and investigators in the reported literature. Conspicuously this aspect appears to be inadequately investigated. The paper attempts to highlight the analysis of deep anchors in soft clays by proposing an idealized load transfer mechanism and the mode of failure of this soil-foundation system. The presently used foundation element for resting light structures on expansive soils, in the form of an underreamed pile, is proposed to be used as an effective deep anchor. With reference to this soil-under-reamed pile system, analytical as well as experimental studies are carried out. The analysis led to a simple and easy way to use equation for estimating the pullout load capacity of ground anchors, in clays of medium to soft consistency. In order to evaluate the validity of theoretical formulation, a detailed experimental program was undertaken. The model studies incorporated under-reamed pile models of three shaft diameters with under-reaming ratio of 2.5, four values of depth factors. The clay 2 soil used in studies had cu=0.24 kg/cm . The observed failure loads were compared with the computed values which revealed that, for under-reamed piles having length larger than 8 times the shaft diameter, there was very close agreement between the above two values.
Heterogeneous traffic flow conditions in India are affected by various traffic characteristics such as driver behavior and prevailing conditions of road geometrics etc. In the present paper, an attempt is made to study the headway behavior of different vehicular composition in the traffic stream. The average speeds were calculated using headways of various vehicle combinations. Headways were determined in traffic stream by video image recording. The video was divided into image frames and analyzed for calculation of headways. To understand heterogeneity, statistical tests have been performed. Longitudinal gaps and vehicle to vehicle distance are measured in AutoCAD. Traffic violations in the study area are studied from available videographic data.
