EFFECT OF BLAST FURNACE SLAG AND LIME MIX ON THE HYDRAULIC CONDUCTIVITY OF CLAY

Prateek Malik Praveen Kumar

M.Tech Scholar, Associate Professor

OITM OITM

Hisar, Haryana, India Hisar, Haryana, India

  1. INTRODUCTION

Though there is more supply of soil as it is one of the cheapest construction materials. It may show some uncovered properties for intended construction purpose. Such as construction on soft soil like clay is difficult and it causes substantial distress/movement to the overlying structure as it possesses low shear strength and high compressibility. The “shrink and swell” behavior of clayey soil can endanger the construction work causing excessive settlement at the site. Again soil can collapse which is much difficult to handle and can danger the life of many people and other living beings. In search of the suitable site there should be no interference with natural stability.Destruction of forest and other vegetation is also not a good idea, natural slope results in imbalance in wildlife, natural calamities like sudden flood (spate), land-slides etc. This problem needs serious attention and alternative solution is to be employed (adopted). Instead of searching a new land, one can go for the betterment for the soil properties by different means such as compaction, use of piles, replacement of soil, soil reinforcement etc. It can also be done by incorporating different materials such as fly ash, lime, rice husk ash, industrial wastes etc. having very low or no production value. Hence problematic soil like clayey soil must be adequately treated before the erection of structure. Wide range of soil modification method is available. Selection of appropriate method should be based on the type of soil and its characteristics, type of the construction, time available, associated cost. With increase in global awareness about environmental pollution, increase in the use of the waste material in the stabilization and modification of a soil is very common and more useful today. On the other hand, the treatment using the lime is widely used in soil engineering by many researchers.

2.OBJECTIVE OF THE STUDY

The study is focused on:-

Improvement of locally available soil using some eco-friendly and cheap waste materials.

Evaluation of permeability characteristics of parent as well as mixed soil using different ratio of Blast Furnace Slag with lime.

  1. METHODOLOGY

Material to be used in the study is:-

LIME– a white caustic alkaline substance consisting of calcium oxide, which is obtained by heating limestone and which combines with water with the production of much heat.

BLAST FURNACE SLAG - Slag is the glass like by-product left over after a desired metal has been separated i.e. smelted from its raw one. Slag is usually a mixture of metal oxide and silicon dioxide. Slag contains metal sulphides and elemental metal.

KAOLINITE: -Kaolinite is a clay mineral, part of the group of industrial minerals, with the chemical composition Al2Si2O5(OH)4. It is a layered silicate mineral, with one tetrahedral sheet of silica (SiO4) linked through oxygen atoms to one octahedral sheet of alumina (AlO6) octahedral.

  • Formula - Al2Si2O5(OH)4
  • Hardness - 2–2.5
  • Optical properties - Biaxial
  • Specific gravity - 2.16–2.68

Test to be Performed are :-

COMPACTION TEST - For parent soil 3kg of oven dried soil sample is taken on tray and thoroughly mixed with water. For the blended mixtures the quantity of soil depends upon the ratio at which it is desired to be mixed with other additives. The amount of water mixed at first trial may vary according to the soil sample composition.

FALLING HEAD PERMEABILITY TEST-For conducting falling head permeability test the kaolinite sample of about 500 grams which is passed through 75 micron sieve. The test is done as per IS 2720 (Part 17) – 1986. The moisture content used for compaction should be the optimum moisture content. The comp active effort may be varied to simulate field conditions. Static compaction may also be used where necessary. The sample is then compacted in the known dimension falling head cell. The readings of water head are noted at regular intervals of time. The results are listed in a tabular form and the permeability is determined

  1. EXPERIMENTAL –

In this study we perform the tests on different mixes of specimens ie a specimen without a mixture means in its pure form and another with a mixing of lime and blast furnace slag with different proportions. We prepare the mixes of different quantities and conduct the test on them and compare the result of different specimens of soil.

  1. CONCLUSION -

From the above study we can conclude the dry density and permeability of the standard specimen of soil by comparing different mixes of different proportions. The mixing of lime and blast furnace slag can bring some chemical changes in the soil specimen and we can check the variation in properties of soil specimen after addition of lime and blast furnace slag between the virgin soil sample and the mixed soil samples with different proportions of lime and blast furnace slag.

  1. REFERENCES -

K.V.Manjunath, HimanshuShekhar, Manish Kumar, Prem Kumar, Rakesh Kumar, Stabilization of black cotton soil using ground granulated blust furnace slag, Proceedings of international conference on advances in architecture and civil engineering ISBN 978-93- 82338-01-7 (AARCV 2012),21st-23rd June ,2012