Wednesday, September 28, 2016

New M.Tech. Thesis Submitted from civil

LOAD CARRYING CAPACITY OF PILED –RAFT SYSTEM USING NUMERICAL APPROACH by Himani Chawla 

Abstract
The foundation system is an important component from the civil engineering point of view in general and it is the duty of geotechnical expert to take care of the safety and stability of foundation of civil engineering projects. The pile raft foundation system is a composite foundation which contributes the involvement of piles, raft, and soil to transfer heavy loads of the superstructure to the ground. The utilization of piled-raft system is an efficient way of reducing both total and differential settlements, enhancing the bearing capacity of a foundation. The analytical work includes the numerical analysis of pile raft foundation under the effect of variable ground water table by generating a numerical model in FEM based PLAXIS 3D software. As piled-raft foundation system is the main concern of its effectiveness because it is the most refered foundation system especialy for the high rise buidings . The relevence of the system comes when one system works efficiently under the adverse subsoil condition at the cheaper cost than the other foundation system. Adverse subsoil conditions comes when the foundation system was encountered with ground water table.The bearing capacity of the saturated soil reduces to about 50% of its orignal bearing capacity in its dry state.The large reduction in the bearing capacity is the serious concern for the geotechnical engineers. So here comes the need to analyse the effect of ground water table on the foundation system.In this study an effort has been made to analyze the experimental results of piled raft using PLAXIS 3D software.With the experimental investigation it is very difficult to study the effect of ground water table variation on the load carrying capacity of the piled raft but using the FEM based PLAXIS 3D this problem can be addressed easily. The study highlights that there is significant reduction in the ultimate load (decreases from 7731.29kN to 5659.68kN when there is rise in ground water table from great depth to ground surface

New M.Tech. Thesis Submitted from civil

STRENGTH IMPROVEMENT OF CLAYEY SOIL BY USING LIME AND WASTE PAPER SLUDGE ASH by Avtarpreet Singh

Abstract
In this report an experimental study has been done on the clay soil stabilized using lime and waste paper sludge ash. Waste paper sludge ash is finally waste product resulting from the combustion of waste paper sludge in paper recycling industries. WPSA classified as class-c fly ash because it containing more than 20% lime (Cao) and having cementitous properties and pozzolanic properties that resulting in the self-cementing characteristics. In this class-c fly ash (WPSA) is self-cementing activators such as, lime and cement. First objective of study is to determine the optimum oncentration
percentage of lime as additives based on the compressive strength. Second objective is to determine the strength development of clay soil stabilized at the optimum percentage of lime at 0 days, 7 of curing periods. Third objective is to determine optimum concentration percentage of WPSA in the lime, soil and WPSA mix sample at the percentage of 0 days, 7 days. This study involved the testing of unconfined compressive strength test to determine the optimum percentage of lime and strength development clay soil stabilized at the optimum percentage of lime. The second test is tri-axial test to
determine the shear strength value for clay- lime and WPSA stabilized with optimum percentage of WPSA. Result shows that the optimum concentration of lime to stabilize the clay soil is about 8% at the maximum compressive strength of 601.43kN/m2. Addition of 6% WPSA has increased the value of shear strength compared to the control from 0 days to 7 days of curing periods respectively. This studyshows that the clay soil can stabilized using lime and WPSA effective to enhance clay soil strength for long period of time.

New M.Tech. Thesis Submitted from civil

STRENGTH IMPROVEMENT OF CLAYEY SOIL BY USING FLY ASH AND MARBLE DUST by Amandeep Verma

Abstract
Strength improvement of soil means that to improve the properties of soil by different methods. Some
waste materials are used to improve the soil such materials are fly ash, marble dust. Fly ash is the ash
produced by burning of pulverized coal in thermal power plans. Marble industries are producing larger amount of marble dust. The rapid growth of marble dust creates a big problem on environment as acts as a pollutant and affect the ecological system. Hence both material are cheap by cost. The object to carry out this study was to evaluate the effect of materials i.e marble dust and fly ash when mixed with clay soil. The physical and chemical properties of soil was improved by addition of such those materials. Whereas some expecting properties are index properties, compaction characteristics and strength properties. The marble dust is added in range of 5–20 % in corporation with fly ash 10-30%. Laboratory studies were performed to identification the Atterberg limits, proctor density, Unconfined compression strength, triaxial test. It was found that addition of 20% fly ash in soil shows maximum strength value increases 114.42% Unconfined compression strength(UCS). Further addition of fly ash has negative effects on these properties. Triaxial test is performed to calculate shear strength parameters of mixed soil i.e soil, fly ash and marble dust. It was found that cohesion character (‘c’) goes on decreasing and angle of internal friction (φ) goes on increasing by addition of marble dust in soil and optimized fly ash. Test results shows marble dust and fly ash improves strength characteristics of soil along with those use of materials is economical and also solves the problem of environment

New M.Tech. Thesis Submitted from civil

PRETREATMENT OF TEXTILE INDUSTRY WASTEWATER USING NATURAL  OAGULANTS by Mandeep Kaur 

Abstract
The textile industry consumes large quantities of water and produces large volumes of wastewater with high color, turbidity, BOD, COD, suspended solids, sulfide, chlorides and heavy metals. Untreated effluents when discharged directly into the open lands or into water bodies can cause irreversible harm to the environment. Coagulation is the most important physical and chemical treatment used in industrial wastewater treatment to diminish the various wastewater parameters. Now a day, more interest has been given on the pretreatment of wastewater coming from industries with natural coagulants because natural coagulants are relatively cost-effective as compared to chemical coagulants. As moringa oleifera and cactus are easily available, they are used as natural coagulant in this research to reduce color, turbidity, nitrates, chlorides, fluorides in dyeing wastewater. Sharman spinning mills is a textile industry which was selected for work and is situated in Ludhiana. The wastewater generated during dyeing process was collected from textile industry. The coagulation of wastewater was done with jar test apparatus was carried out using natural coagulants. Optimum dosage and optimum pH were determined after intensive lab scale testing. The pH value of 10.5 was found to be more efficient for removal of chlorides, nitrates, fluorides for both coagulants, whereas in case of turbidity and color efficient pH was found to be 3.5, but pH 10.5 was considered to be optimum pH because there was significant removal of wastewater parameter characteristics. Similarly the optimum dosage of cactus and moringa oleifera for efficient removal of all parameters was found to be 0.6gm/500ml at pH 10.5.