Ravi K. Sharma

Response Assessment under Dynamic Loading and Microstructural Investigations of Rubberized Concrete

AbstractDynamic loading may severely compromise the functional performance of concrete. The present study examined the effects of the partial replacement of fine aggregates with rubber ash (0, 5, 1...

Behavior of Concrete Utilizing Recycled Aggregate – A Review

Today’s modern era is demanding more and more infrastructure development and with the increasing demand of infrastructure, the demand and supply chain of the construction material are getting affected. With increasing pace of development, a great concern is required towards environment as well as natural resources. In this paper, behavior of concrete utilizing recycled aggregate is critically reviewed. Properties of recycled aggregate are discussed at first, followed by the properties of concrete utilizing recycled aggregate. It has been reported that recycled aggregate was found useful if the replacement level is about 30% .This type of concrete has been used in many applications. Recycled aggregate can be seen as future material which will be eco -friendly and will decrease in project cost.

Utilization of shredded waste plastic bags to improve impact and abrasion resistance of concrete

Plastic bags (PB) have become a requisite part of human beings in the present time. Hundreds of varieties of plastic bags are used for packing and protecting general things. The disposal of PB is a prime environmental problem which significantly threatens the environment, as its disposal affects fertility of land due to its non-biodegradable nature; it lowers useful land area and generates toxic gases on incineration. Hence, there is a requirement of useful applications for these increased quantities of wastes. The usage of waste plastic bags (WPB) in concrete not only solve dumping crisis of WPB but also yields cost-effective concrete, which is worthy to both plastic recycling and construction industry. In this study, the influence of shredded WPB as fine aggregate on the properties of concrete was evaluated. The replacement of WPB was maintained at 0, 5, 10, 15 and 20% by weight of fine aggregate. The finding of the tested samples showed that the workability, density, compressive strength, flexural strength, static and dynamic modulus of elasticity of concrete samples decreased with increase in the WPB content, while penetrability to water increased. Microstructural analysis of the plastic waste concrete (PWC) specimens was carried out using scanning electron microscope. The microstructural studies indicated the presence of voids and openings between mortar matrix and WPB which was the main reason for the inferior properties of PWC. However, there has been a significant improvement in abrasion resistance, impact resistance and energy absorption capacity of PWC.

Performance Levels of RC Structures by Non-Linear Pushover Analysis

In the recent earthquakes in which many concrete structures have been severely damaged or collapsed, have indicated the need for evaluating the seismic adequacy of existing buildings. About 60% of the land area of our country is susceptible to damaging levels of seismic hazard. We can’t avoid future earthquakes, but preparedness and safe building construction practices can certainly reduce the extent of damage and loss. In order to strengthen and resist the buildings for future earthquakes, the behavior of a building during earthquakes depends critically on its overall shape, size and geometry. The nonlinear pushover analysis is becoming a popular tool for seismic performance evaluation of existing and new structures. The weak zones in the structure can be examined by conducting this push over analysis and then it will be decided whether the particular part is to be retrofitted or rehabilitated according to the requirement. This method determines the base shear capacity of the building and performance levels of each part of building under varying intensity of seismic force. The results of effects of different plan on seismic response of buildings have been presented in terms of displacement, base shear and plastic hinge pattern