Influence of Nano Silica on the Geotechnical Properties of Clayey Soil Stabilized with Lime

The soil must be able to withstand the load and transfer it to ground within the range of allowable deformations, for which it must possess good physical and geotechnical properties. The conventional method of stabilization such as removal and replacement of ill – suited soils incur higher cost and is time consuming. A new method of stabilization, designated as chemical stabilization can be adopted. This method initiate chemical reactions such as cation exchange, pozzolanic activity etc., which consequently enhance the geotechnical properties of soil. In this study, the mechanical behavior of soil is improved by addition of nanoparticles i.e., nano silica along with cementitious material, lime. Considering economic issues of nano silica usage and results of this research in soil stabilization projects, in this study 0, 1, 3 and 5 % weight of nano silica is used as well as 0, 2 and 4 % weight of lime is used. The effect of these replacements is studied by Atterberg limits test, compaction test and unconfined compressive strength (UCS) test. The effect of curing time on samples at 3, 7 and 28 days of age has also been investigated. The optimum percentage replacement of nano silica in lime stabilized soil is determined. The microstructure of the stabilized soil is studied by Scanning electron microscopy (SEM) test. Thus the results proved that there is a significant improvement in the plasticity, compaction and strength properties with slight addition of nano silica in clayey soil mixed with lime.</jats:p

Preliminary investigation on environmental degradation due to salinization of river and groundwater in Thamirabarani Delta, South India

1148-1153Present study consists analysis of data such as river discharge, cropping pattern, subsurface lithology and tidal fluctuations collected from Government organizations. Thematic maps pertaining to the study namely, drainage map, geomorphological map, lineament map and land use map were prepared from the satellite imageries. Well inventory survey and ground truth verifications were also carried out in this region. All spatial and non-spatial data were integrated using geographical information system (GIS). A site was selected for the construction of ‘Ogee’ type of surplus weir across the Thamirabarani River to minimize the salinisation of surface water and groundwater

Study And Analysis of Unstable Slope In Burliar, The Nilgiris-India

Landslide is the sudden and rapid downward movement of a mass of rocks or earth on a steep slope. Landslide is one of the major natural hazards that affect most of the area all over the world. In India landslide mostly occurs in hilly terrains of Northern Himalayas and Southern Western and Eastern Ghats. The Nilgiris hills is located at the convergence zone of the Eastern Ghats and the Western Ghats and characterized by a lateritic cap, which is sensitive to over-saturation and highly landslide prone. Rainfall data’s collected from Indian Meteorological Department (IMD). The data’s about the landslide is taken from Geological Survey of India (GSI). Burliar location, which is nearer to foothill of Nilgiris mountain range, is considered for the study and the Slope stability analysis is done. Soil sample were collected and laboratory investigations are carried out to find the Engineering and strength properties of soil. Results show that the soil is classified under SM category. Very fine composed of high silt content over a very deep depth. The soil-rock interface is easily softened by the rainfall which smoothens the surface leads to slope failure. Also the silty soil is easily carried away by even small rainfall which leads to hue downpour of soil around roads and valleys

Influence of Cu substitution on structural, morphological and optical properties of Cr/ZnO nanopowders

Chromium doped Zinc oxide (Zn0.96Cr0.04O), Chromium and Copper co-doped ZnO nanoparticles (Zn0.96Cr0.04Cu0.02O &amp; Zn0.96Cr0.04Cu0.04O) successfully synthesized by chemical precipitation method at 5000C. The crystalline structure, surface morphology and optical properties of the prepared Cr/ZnO and Cr/Cu/ZnO nanoparticles were examined as a function of doping substance and the prepared samples were characterized using XRD, SEM, EDS and UV-Vis spectroscopy analysis. The synthesized nanoparticles show hexagonal wurtzite structure, and the phase segregation takes place for Cu doping. Optical studies revealed that Cr doping increases the energy band gap while Cu incorporation results in decrease of the band gap.</jats:p

Comparative analysis on choice of biocatalyst to enhance biogas for municipal sewage sludge at laboratory scale

This record contains a poster. Presented at the 43rd WEDC International Conference</p