Experimental Investigation on Expansive Soil Stabilization by Using Steel Slag

Transcription

1 International Journal of Mechanics and Solids. ISSN Volume 12, Number 1 (2017), pp Research India Publications Experimental Investigation on Expansive Soil Stabilization by Using Steel Slag Chippada Srinivas 1. M.Tech Aditya Engineering college, Andhra Pradesh, INDIA Abstract Expansive soils always have disadvantage of sudden volume change. The structural foundations and roads constructed on such soils may undergo large uplift forces. Many researches have been attempted in past to avoid such failures by enhancing the engineering properties of expansive soil. Steel slag is a by product of steel manufacturing industry which is dumped in large quantities every year. It is desirable to partially replace expansive soil with steel slag. In this research work, expansive soil is partially replaced with steel slag at different percentages. It has been found that partial replacement of slag in expansive soil is optimum at 20 %. Tests like plastic limit, liquid limit, standard proctor and California bearing ratio have been conducted to derive such optimum percentage of steel slag in expansive soil. Keywords: Expansive soil, Steel slag 1. INTRODUCTION Expansive soil is one of the abundantly available soil on majority parts of Earth. It is a problematic geological formation with high potential of shrinking or swelling due

2 72 Chippada Srinivas to change in moisture content. Hence it is necessary to find alternatives to avoid such disadvantages. In countries with large population like India, it is a challenge to lay road networks of thousands of kilometers. Hence searching for economical methods of road construction is necessary. One of such desirable idea is to partially replace soil with locally abundant materials so that soil cost may reduce. The construction cost can considerably decreased by partially replacing local materials in soil at lower layers of road pavements like sub-base course. Disposal of waste materials from industries is resulting in direct or indirect pollution on environment. Engineering use of such wastes like steel slag is always an acceptable criteria. Partial replacement of expansive soil by steel slag is the solution for three problems mentioned above. In this research work, pulverised expansive soil is replaced with steel slag at 0%,10%,20% and 30%. All the key geo-technical tests like plastic limit, liquid limit, standard proctor and California bearing tests were conducted as per IS codes. The results of soil at different replacement percentages were compared to conclude the overall optimum percentage of that particular material in expansive soil. Sandip et al[1] had investigated an expansive soil sample by partially replacing a fine steel slag. Faisal et al[2] experimented different types of geo-technical tests like triaxial, light and heavy compaction tests to study the changes in engineering properties by partially replacing clay soil sample with pulverized steel slag. Hussien et al[3] had studied engineering properties on a sample of highly plastic clay soil by replacing with fine steel slag. Shipra et al[4] had studied the strength and shear factors of sample of clay soil by partial replacement with fresh steel slag at various percentages. 2. EXPERIMENTAL PROCEDURE: Appropriate amounts of black cotton soil and steel slag were collected and pulverized. Properties like Specific gravity, Liquid limit, Plastic limit, Optimum Moisture Content, Maximum Dry Density are determined for these samples to check the quality. Samples of black cotton soil replaced with different percentages of steel slag were mixed and seperated. Atterberg limits of these samples are determined to calculate the respective plasticity index values. Heavy Weight Compaction tests were conducted to estimate Optimum Moisture Content and Maximum Dry Density of these samples. Also California Bearing Ratio test is conducted to determine CBR Penetration value. After completing the experiments, the results of all prescribed soil samples were compared in graphical forms.

3 Experimental Investigation on Expansive Soil Stabilization by Using Steel Slag RESULTS AND DISCUSSIONS: a) Comparison of Liquid limit values for different replacement percentages of Steel slag in cotton soil Liquid limit increased with increase in steel slag content in clay soil. Liquid Limit Fig:1- Liquid Limit vs b) Comparison of Plastic limit values for different replacement percentages of Steel slag in cotton soil Plastic Limit decreased with increase in content of Steel Slag in clay soil Plastic Limit Fig:2- Plastic Limit vs % of steel slag

4 74 Chippada Srinivas c) Comparison of OMC for different replacement percentages of Steel slag in cotton soil. Optimum Moisture Content had varied randomly with increase in Steel Slag content in clay soil under heavy weight compaction Max. Dry Density (g/cc) Fig:3- OMC vs d) Comparison of MDD for different replacement percentages of Steel slag in cotton soil. Maximum Dry Density increased with increase in Steel Slag content in clay soil under heavy weight compaction Max. Dry Density Fig:4- Max.Dry Density vs

5 Experimental Investigation on Expansive Soil Stabilization by Using Steel Slag 75 e) Comparison of CBR values for different replacement percentages of Steel slag in cotton soil. CBR Penetration resistance had varied randomly with increase in Steel Slag content in clay soil 7 CBR (for 5mm penetration) Fig:5- CBR Penetration vs From overall analysis of these comparison graphs, it can be observed that the optimum percentage of Steel Slag in clay soil is 20% to modify engineering properties. CONCLUSIONS 1) Liquid and Plastic limits increased with increase in steel slag content in clay soil. 2) Optimum Moisture Content had varied randomly with increase in Steel Slag content in clay soil heavy weight compaction. 3) Maximum Dry Density increased with increase in Steel Slag content in clay soil. 4) CBR Penetration resistance had varied randomly with increase in Steel Slag content in clay soil. 5) The optimum percentage of pulverized Steel Slag in clay soil is upto 20%. 6) Steel Slag can be effectively mixed in Expansive type of soils to improve engineering properties.

6 76 Chippada Srinivas REFERENCES [1] Use of steel slag in construction of flexible pavement, Sandip.S.Patil, S.S.Bachhav, D.Y.K shirsagar, International Journal of Engineering and Innovative Technology (IJEIT), Volume 5, Issue 11, May [2] Effect of by-product steel slag on the engineering properties of clay soils, Faisal I. Shalabi, Ibrahim M. Asi, Hisham Y. Qasrawi, Journal of King Saud University Engineering Sciences, 19 July [3] Experimental Study on the Utilization of Fine Steel Slag on Stabilizing High Plastic Subgrade Soil, Hussien Aldeeky and Omar Al Hattamleh, Advances in Civil Engineering, Volume 2017 (2017), Article ID , 11 pages. [4] Soil Stabilization Using Steel Slag, Shipra Chaubey, S. M. Ali Jawaid, Global journals for research analysis, Vol 5,No:1(2016).