e-ISSN: 2582-5208 International Research Journal of Modernization in Engineering Technology and Science Volume:03/Issue:03/March-2021
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EFFECT OF SALINE WATER ON CBR AND SWELLING CHARACTERISTICS OF SOIL Nazim Nisar Memon *1, Aneel Kumar*2, Zaheer Ahmed Almani*3, Qazi Moiz Ali*4, Ali Raza Lashari*5 *1,2,3,4,5Civil
Engineering Department Mehran UET, Jamshoro, Sindh, Pakistan.
ABSTRACT In massive demand of water usage and its availability in our daily life, in construction and in material (sample) testing. We use potable water which is expensive water in terms of its short availability in the earth. Out of 100% earth comprises of 30% sweet water and rest is saline water. This research has been carried upon to introduce saline water usage in only Geotechnical properties of soil. Water percolation in the soil influences the different geotechnical properties of soil. It modifies soil behavior and generates a geotechnical issue that increases Alkalinity and TDS value the effect of water salinity on creation properties of clay soil is addressed in this thesis. The properties (results) obtained from tests conducted on samples combine with sea water are contrasted with samples mixed with tap water. Five samples were examined with different proportion of water was mixed with each other. First sample was pure tap water 100%, second sample was proportioned with 75% of tap water and 25% of saline water, third sample was proportioned at half of both 50% of tap water and other 50% of saline water, fourth sample was proportioned with 25% of tap water and 75% of saline water and last sample fifth sample was complete saline water 100%. Different tests have been carried out to measure the Atterberg limit, Compaction Characteristics, CBR (Un-soaked and Soaked) and Swelling Potential. It was observed and found that Atterberg limits (L.L and P.L) decreases with increase in salinity of water along with this Plasticity index decreases on the addition of sea water. On the other side, Maximum Dry Density (MDD) slightly increases and Optimum Moisture Content (OMC) decreases with the increases in sea water concentration and CBR value at 5mm penetration is more as compared to 2.5mm in both un-soaked as well as soaked. Keywords: Saline Water, TDS, Liquid and Plastic Limit, MDD and OMC.
I.
INTRODUCTION
Water characteristics which are used in many activities during construction are used in many activities during construction follows rules, regulations and international standards such as concrete. But if we talk about soil, there are no specific standard rules and regulations about water characteristics (Ajalloeian,R., et al, 2013). Although soil structures such as concrete structures, water which is in contact with them do not affect and consequence of pore water characteristics could be considerable in particular conditions to the core medium of earthen dam. Speaking truly, geotechnical behavior of lot of soils is depending upon chemistry of pore fluid. However, supplying the needed water content to soil in laboratory, drinking water is usually used (Pyne, R.E., 1955). By using special type of H2O in construction the nature of properties in Geotechnical cum soils makes totally no change is incorrect in explaining, but when using non-portable water during site for mainly purpose in providing require moisture in managing of earthen dam core, the same water must be significantly in observable characteristics (Chen, F.H.,1981). Further saline water has great impact on engineering properties of clayey soil, like montmorillonite. In fine grained soil, properties of soil rely on science of pore liquid. Because of extreme siphoning of ground water, saline water interruption happens which causes momentous alterations in geotechnical properties of soil (Ghafoori, N., and Cai, Y., 1997). Coastal zones contain some of most thickly populated territories on the earth which present the best condition for productivity. These are the areas which face numerous hydrological issues because of violent winds, wave flood and drinking freshwater shortage because of effect of salt which is present in water that makes undrinkable. Saltwater interruption lessens capacity of new water in coastal aquifers and can bring about abandonment of freshwater supply dividers when concentration of dissolved particles overpasses freshwater norms (Ghafoori, N., 2000) . The level of salt water varies for various areas and hydro geologic settings. Due to interruption of ocean water in seashore area, soil gets influenced and causing aggravations in super structure development and framing soil salinization. Soil www.irjmets.com
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