International Research Journal of Engineering and Technology (IRJET) e-ISSN: 2395-0056 Volume: 07 Issue: 05 | May 2020 www.irjet.net p-ISSN: 2395-0072 © 2020, IRJET | Impact Factor value: 7.529 | ISO 9001:2008 Certified Journal | Page 2798 Influence of Fly Ash, Wastepaper Sludge Ash and Polypropylene Fibre on Compaction and Strength Properties of Subgrade Ayani Tasaduq 1 , Mohd. Irshad Malik 2 1 M.E Student Department of Civil Engineering, Chandigarh University 2 Assistant Professor, Chandigarh University, Gharuan ---------------------------------------------------------------------------***---------------------------------------------------------------------- Abstract : Clay soil is a distinct weak material which shows unpredictable behaviour. Some waste materials like fly ash, waste paper sludge ash, rice husk ash etc, in addition to natural and synthetic fibres can be used to make the soil suitable for construction. Waste paper sludge ash is the fine waste product that is obtained from the oxidation of waste paper sludge in paper recycling industries. Fly ash is also the fine waste that is obtained from the combustion of coal at thermal power plants or at electric power plants. Fly ash has minimal cementitious nature, however within the sight of dampness, it responds synthetically and structures cementitious mixes that pertain to advancing the properties of soil. Inclusion of these materials will result in the increment of physical and chemical properties of clay soil. Some anticipating properties that need to be enhanced are California bearing ratio, shear strength, liquidity index, plasticity index, unconfined compressive strength, bearing capacity etc. The principal goal of this entire research was to assess the influence of fly ash, waste paper sludge ash in addition with polypropylene fibre to stabilize the soil, so as to improve the properties like strength, volume stability and durability of soil. The series of test to be carried out were compaction tests, unconfined compression tests, California bearing ratio, direct shear and Atterberg limits test at the optimum moisture content. Key Words: soil stabilization, clay, fly ash, waste paper sludge, polypropylene fibre. 1. INTRODUCTION Expansive soils need treatment preceding use as a designing material. These treatments are generally classified into two procedures, viz. soil modification and soil stabilization. Soil stabilization is the path towards mixing and blending materials in with soil to improve certain properties of the soil. The procedure may incorporate the mixing of soils to the accessible admixtures that result in the change of degree, surface or versatility, or then again go about as a binder for cementation of soil. Soil modification is the adjustment procedure wherein there is improvement in certain properties of the soil, however it does not bring about the noteworthy increment in soil quality and durability. Soil properties like strength, compressibility, workability, swelling potential and volume change susceptibility might be altered by various soil stabilization and modification strategies. Stabilization is procured by thermal, mechanical, chemical or electrical means. Clay is an expansive soil that creates a problem in design and construction of civil engineering structures. At the point when clay soil interacts with water, swelling occurs and, shrinks when water content declines in the view of which structures are damaged. It makes more harm to the asphalts and light buildings than some characteristic risk including earthquake and flood. In India, it is found in the Indian Deccan Plateau which covers about 0.8×10 6 km 2 (approx. 20% surface area). If we explain clay in the engineering terminology, it is the fine-grained soil having molecule size underneath 2 microns. The behaviour of soil widely relies on the water content. Plasticity index is the fundamental parameter to classify the fine- grained soil which is determined from two other primary parameters which are liquid limit and plastic limit. Shrinkage limit is likewise the parameter to characterize clay. Plasticity index associates with the building properties like over- consolidation ratio, unconfined compressive strength etc. The conduct of clay soil depends greatly upon the measure of various earth minerals like illite, kaolinite and montmorillonite. Among the three montmorillonite has the greatest potential to swell and shrink. 2. LITERATURE REVIEW Garcial et al. (2008) has worked on the pozzolanic properties of paper sludge waste. It was found that the utilization of paper sludge in pozzolanic material production allows a disposable residue to be included in the cycle of the materials. It focused on the potential of waste paper sludge as a crude material for yielding a product with pozzolanic action, at 700 0 C for 2 hours. The organic matter disappears and the calcined sludge becomes operative by moulding kaolinite mineral into met kaolinite.