Performance Assessment of Stabilized Soil with Fly Ash- Nano Material Mixes

Pavement infrastructure projects require large amount of soil for construction. Very often massive amount of the available soil is found to be weak, highly plastic and expansive in nature, which is unsuitable for constructions. Several studies in the past reveal favorable results for application of problematic soils with additives like lime, cement, fly ash, etc. Since, enormous quantity of fly ash is available from proximity of thermal power stations; the advantage of fly ash can be idealized to stabilize the weak soils. This research paper reports the adequacy of fly ash as an additive in improving the geotechnical properties of medium expansive silty soil in conjunction with nano material. Silty sand was treated with fly ash ranging from ۱۰%, ۲۰%, ۳۰%, ۴۰% and ۵۰% by dry weight of soil. Each proportion was further treated with nano solution with four different dilution ratios of (۱:۱۰۰), (۱:۲۲۵), (۱:۴۰۰) and (۱:۶۰۰) by volume. The CBR properties were found to be highly improved on addition of fly ash and nano material to soil. Similarly, plasticity and hydraulic conductivity properties of the blends were observed to be considerably decreased with the addition of fly ash and nano material. The blends with ۳۰% fly ash and nano solution of (۱:۱۰۰) yielded excellent results. Thus, the soil modified with fly ash and nano material in this research provides a feasible engineered solution to improve the quality and endurance of pavement framework practices and also offers an indubitable contribution towards the problem of fly ash relinquishment and utility.

Keywords:

Fly ash , Nano material , Liquid limit , Plastic limit , California Bearing Ratio , Pavements