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UTILIZATION OF AGRO AND INDUSTRIAL WASTES AS FILL MATERIALS IN RETAINING STRUCTURESAuthor: POOJA AMBARAKONDA Date: 2019-04-02 Report no: IIIT/TH/2019/40 Advisor: Supriya Mohanty,Shaik Rehana AbstractGrowing infrastructure is demanding huge amounts of construction and fill materials, though the source available is limited. This unavoidable scenario in civil engineering needs alternative materials which can be substitutes to the conventional fill materials. It would be more advantageous if waste materials are made substitutes. Out of the motivation gained from the past research on waste utilization, waste materials considered for the present study are rice husk ash (RHA), quarry waste (QW) and granulated rubber (GR). Geotechnical properties of combinations of materials were investigated for the under two different studies namely, Study-I and Study-II. Under Study-I, light weight rice husk ash has been strengthened using quarry waste as additive and under Study-II, a light weight high strength material has been proposed using granulated rubber as additive to quarry waste. A series of experimental tests have been performed in Study-I and Study-II to explore their geotechnical behavior. Based on the outcomes of the experimental investigation of Study-I, the RQ50 mix (consisting equal amounts of rice husk ash and quarry waste by weight) was found to be the optimum mix. Numerical analysis under seismic loading has been performed on earth dam with RQ50 mix, QW as shell materials, in order to check their suitability to utilize in earth dam. The seismic performance of earth dam with RQ50 as shell material has been compared to that of dam with dense quarry waste as shell material, using finite element software PLAXIS 2D. The results from numerical study concluded the better seismic performance of earth dam with RQ50 than that with quarry waste, though the mix was lighter compared to quarry waste material. Thus, this combination can form an efficient material to be used as shell material in earth dam. The laboratory outcomes of Study-II have concluded the reduction in maximum dry density of quarry waste by about 0.77gm/cc upon adding 30% of granulated rubber for which the friction angle was found to improve by about 14 ĚŠ . The experimental results concluded QGR mixes (quarry waste mixes with granulated rubber) to be efficient backfill material with high strength and lightweight. QGR30 mix (70% QW+30% GR by weight) has been identified as best performing mix from the laboratory tests. The lateral earth pressure reduction on retaining wall by utilizing QGR30 as backfill compared to sand, quarry waste would be about 85%, 73% respectively. The advantage of lightweight and high strength fill is very economical as it would result in reduced lateral pressure, thereby the reduction in dimensions of supporting wall. The savings in the cost of backfill material using QGR30 over sand would be around 8.35%. Thus, from this study, the QGR mixes were found to be promising alternatives to the conventional fill materials, having high strength and low weight. Full thesis: pdf Centre for Earthquake Engineering |
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