Civil Engineering

The experimental study has been made to utilize natural agrosilica (agrowaste) as a pozzolana by partial replacement of cement. The agrowastes that are rich in silica namely sugarcane bagasse ash, rice husk ash, wood ash are being taken for the study. The study is done for compressive strength, split tensile strength, flexural stength. Optimum percentage of replacement of different agro waste is determined. Thus utilization of agro waste in concrete and accounts for green concrete.

The major sources for cracking in the bridge decks are the settlement cracking. As these cracks continued growth due to the factors effect on the durability of the structures such as chloride and sulfates attacks, corrosion if the reinforcement, freeze-thaw damage and others. So these cracks considered a very severe problem at the life time. The object of this paper is to assess the effect of pozzolanic materials on the settlement cracking of concrete. 85 mixes were cast to explore the aim of this research. The main variables were type of concrete (self-compacted concrete, normal concrete), type of supplementary materials (silica fume, fly ash). 1, 2.5, 5, 7.5% of silica fume as a replacement of cement content was used. 5, 10, 15, 20, 25 and 30 % of fly ash as a replacement of cement content were used. The results clearly that the supplementary materials enhanced the micro-structure of the mixes by reducing the settlement cracking compared with the control mixes. Fly ash reduces the settlement cracks more than silica fume. Settlement cracking didn't observe for the self-compacting concrete mixes. Out of this research; decreasing the settlement cracks yield to get better the durability of the structures, eliminate the abrasion and corrosion of the reinforcement. This yield to decreases the cost needed for maintenance and increases the life time of the structures.

A series of models were developed and analysed to determine the relative weight of local political, infrastructure, and economic gains to lake user as well as physical-natural characteristics of the lakes and their respective communities on allocation of dredging fund. The also estimated the benefits of dredging and performed cost-benefit analysis to compare the costs of dredging to benefits of dredging for Bonny channel. These estimates were then forecasted in order to view the benefit stream over time.

This Paper studies the flexural strength and deflection of Sawdust–Quarry dust–Plywood Composite Slab. The materials used include Cement, Quarry dust, Sawdust, Plywood, Nails, and water. Laboratory test were carried out on this composite according to standard test procedures. They were tested for flexural strength and deflection. It was observed that for a 1200mm width of slab with thicknesses between 100mm to 175mm and Plywood Thickness 12.5mm to 20mm, the average flexural strength of this composite slab ranges from 1.32MPa to 3.30MPa. The deflection slab ranges from 106mm to 33mm while those of plain composite slab ranges from 20mm to 5mm

Present study deal with the investigation on parametric study on self supporting chimney considering in three different cities of India . The 65 m height and 80 m height of chimneys were selected and analyzed for wind force and seismic loadings for seismic zone III , IV and V, as per Indian standards (IS: 6533 -1989 ) and IS 1893(part 1) 2002. The wind loads were determined as per IS 875-1987 for the basic wind speed 47m/s, 50m/s and 55m/s. The thicknesses of the chimney were kept constant for this study. Significant increments were observed in displacement, bending moment and shear force for different seismic and wind zones. The results of self supporting steel chimney were obtained out with the above said parameters.

Reinforced concrete frames structures with unreinforced masonry infill walls are prevailing in developing countries like India with regions of high seismicity. The aim of this study is to compare different response parameter on the effect of different masonry infill materials for reinforced concrete frames . For this purpose G+14 RC framed building were model with different infill materials and Response spectrum method has been executed for the analysis as per IS1893:2002 using Etabs software. The variation of base shear, storey drift, and displacement were obtained by the analysis of three RC frame models viz. bare frame, in-filled frame and open first storey frames were carried out. For modelling of infill wall, Equivalent diagonal strut method is used to find out the width of strut using FEMA approach. The results are compared and shown in the form of graphs. The results show that with addition to opening, hollow concrete block and fly ash brick frame in-filled models exhibit superior seismic behaviour.

To supply blood, arties and veins plays the important role in the body similarly, road networks plays a vital role in transportation system. Transportation system has geared up its performance level by constructing expressways, national highways, state highways etc. in consideration of increasing traffic. “Black spot is the place where accidents are historically occurred” This paper emphasis the study of some local city roads (Khadi Machine Chowk-Kondhwa, KMC-Undri and KMC-Katraj) of Pune. From the present traffic accident statistics the identification of accidental black spots is done in present study by using ranking method with the help of severity index.

Algae and duckweed based wastewater stabilizations ponds for wastewater treatment was carried out at experimental model. The study hoped to contribute towards improved environmental management through improving the quality of effluent being discharged into natural waterways. This was to be achieved through the development and facilitation of the use of Algae and duckweed based wastewater stabilizations ponds to achieve less consumption of electricity. A model of three pond (sedimentation pond , Algae and duckweed pond) in series of experimental work., the three ponds had the same area (1.8 x 0.6 x 0.08) . Waste water quality information was collected in following chemical, physical and bacteriological parameters included: pH, biological oxygen demand, chemical oxygen demand, Dissolve oxygen . The Algae and duckweed based waste stabilization ponds 80 -90 % successfully for the treatment of wastewater .

In reinforced concrete frame building, masonry wall are generally used in as infills and specified by architects as partitions in such a way that they do not contribute to the vertical gravity load-bearing capacity of the structure. Infill walls protect the inside of the buildings from the environment hazards and create separation insides. In addition to this infills have a considerable strength and stiffness. In the present study, it is attempt to highlights the performance of masonry infilled reinforced concrete (RC) frames with and without openings to ultimate loads.

Centrifugal pumps are the most widely used pumps due to their simple construction and ease of installation. As use of centrifugal pumps is very common they need to be efficient and low power consuming. Performance of a centrifugal pump depends on various factors like blade angle, blade thickness, number of blades, blade shape, blade outlet diameter etc. In the present analysis the effect of blade shape on the performance of centrifugal pump is shown by designing the blade profile using Concentric Circular Arc Method and Point By Point Method. For both the methods design parameters are kept same and CFD analysis is done to obtain the performance of pump at different flow conditions. Various results are evaluated and compared through charts and graphs.