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STABILIZATION OF BLAST FURNACE SLAG AND FLY ASH USING LIME AND RBI GRADE 81

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Fly ash was collected from in-house power plant (CPP-II) and BFS from Rourkela Steel Plant (RSP). Variation of UCS value with curing period for 100% fly ash stabilized sample for different percentage of RBI grade 81. Variation of UCS value with curing period for 90% fly ash + 10% BFS stabilized sample for different percentage of RBI grade 81.

Variation of UCS value with cure period for 80% fly ash + 20% BFS stabilized sample for different percentage of RBI class 81. Variation of UCS value with cure period for 70% fly ash + 30% BFS stabilized sample for different percentage of RBI class 81. Variation of UCS value with curing period for 60% fly ash + 40% BFS stabilized sample for different percentage RBI class 81.

Variation of UCS value with curing period for 50% fly ash + 50% BFS stabilized sample for different percentage of RBI grade 81. Variation of UCS value with curing period for 40% fly ash + 60% BFS stabilized sample for different percentage of RBI -quality 81.

INTRODUCTION

The geotechnical properties of BFS and fly ash were then revealed through laboratory experiments. Standard proctor test was also conducted to obtain optimum moisture content (OMC) and maximum dry density (MDD) of fly ash. BFS, fly ash, lime, and RBI grade 81 were studied under a scanning electron microscope (SEM) to obtain magnified pictures of the particles.

Samples were then prepared by mixing BFS and fly ash with different percentages at an interval of 10% and standard proctor test was performed to get optimum moisture content (OMC) and maximum dry density (MDD). Stabilized samples were prepared by mixing BFS and fly ash with different percentages with an interval of 10% and with stabilizer lime and RBI grade 81 with increasing percentage of ash and 8%.

LITERATURE REVIEW

  • Industrial waste products: An Overview
    • Fly Ash: An Overview
    • Blast Furnace Slag (BFS): An Overview
  • Lime: An Overview
  • RBI Grade 81: An Overview
  • Soil Stabilization: An Overview
  • Problem Statement
  • Experimental Setups
    • Standard Proctor Test (IS 2720 Part VII 1980/87)
    • Unconfined Compressive Test (IS 2720 Part X 1980/87)

Electrofly ash is very similar to volcanic ash, which was used in the production of the earliest known hydraulic cements about 2,300 years ago. Electrofly ash is the best known and one of the most widely used pozzolans in the world. Molten slag, which absorbs much of the sulfur from the filler, comprises about 20 percent by weight of iron production.

The long-term performance of any construction project depends on the soundness of the underlying soils. The mineralogical properties of the soils determine their degree of reactivity with lime and the ultimate strength that the stabilized layers will develop. The aim of the project is to use industrial waste of blast furnace slag (BFS) and fly ash collected from the Rourkela steel mill instead of natural soil in the construction of roads and highways, after the strength, bearing capacity, volume stability and its durability have been increased by the method of stabilization using lime and RBI grade 81.

The dry density obtained in each test is determined by knowing the mass of. The compacted soil is taken out of the mold and re-mixed with increased water content (with 4.

EXPERIMENTAL PROGRAMME

  • Introduction
  • Materials Used
    • Fly ash
    • Blast furnace slag (BFS)
    • Lime
    • RBI Grade 81
  • Sample preparation
  • Test performed
  • Experimental Results
    • Characterization of BFS and fly ash
    • MDD and OMC at different composition of BFS and fly ash

The stabilized samples were prepared in their respective OMC and MDD with different compositions of BFS and fly ash with an interval of 10% and with stabilizers lime and RBI class 81 with increasing percentage as and 8%. Initially, a standard proctor test was performed to obtain the OMC and MDD of fly ash and a specific gravity test was also performed for both fly ash and BFS. The specific gravity of fly ash and BFS was found to be 2.51 and 2.78 respectively.

A standard proctor test was performed on samples mixed with different percentages of fly ash composition and BFS at 10% interval to determine OMC and MDD. Stabilized samples were prepared by mixing fly ash and BFS with different percentages at an interval of 10% and with lime stabilizer and RBI grade 81 with an increasing percentage to 8%. The distribution of particles in the fly ash sample is viewed at 5000 and 2000 magnification at 15 kV under a scanning electron microscope at a pressure of 50 Pa.

The arrangement of particles in the BFS sample is viewed with a magnification of 5000 and 2000 at 15 kV under the scanning electron microscope in a pressure of 50 Pa. The arrangement of particles in the Kalk sample is seen at a magnification of 5000 and 2000 be. 15 kV under the scanning electron microscope in a pressure of 50 Pa. Unconfined compressive strength (in KN/m2) of samples with different composition of fly ash, slag and lime after 7 days of curing.

Unlimited compressive strength (in KN/m2) of samples with different composition of fly ash, slag and RBI Grade 81 after 7 days of curing. Unlimited compressive strength (in KN/m2) of samples with different composition of fly ash, slag and lime after 14 days of hardening. Unlimited compressive strength (in KN/m2) of samples with different composition of fly ash, slag and RBI Grade 81 after 14 days of curing.

Unconfined compressive strength (in KN/m2) of samples of different compositions of fly ash, slag and RBI Grade 81 after 28 days of curing. Unconfined compressive strength (in KN/m2) of samples of different compositions of fly ash, slag and lime after 60 days of curing. Unconfined compressive strength (in KN/m2) of samples of different compositions of fly ash, slag and RBI Class 81 after 60 days of curing.

ANALYSIS OF RESULTS AND DISCUSSION

Grain size analysis

  • Fly ash
  • Blast furnace slag (BFS)

The coefficient of uniformity (Cu) was found to be 5.9 and the coefficient of curvature (Cc) was found to be 1.66.

Variation of OMC and MDD with BFS and fly ash content

  • Variation of OMC with fly ash content
  • Variation of MDD with fly ash content
  • Variation of OMC with BFS content
  • Variation of MDD with BFS content

It is due to the fact that fly ash is hollow, the maximum dry density decreases linearly. It is due to the fact that fly ash has a hollow structure and thus has a low density. This is due to the fact that low-density fly ash content density (MDD) gradually increases.

This is due to the fact that the low-density fly ash content decreases and the high-density BFS increases, so that the MDD increases.

Variation of UCS value with BFS (%) and fly ash (%)

Variation of UCS value with curing period for 100% fly ash stabilized sample for different percentages of lime. Variation of UCS value with curing period for 90% fly ash + 10% BFS stabilized sample for different percentages of lime. Variation of UCS value with curing period for 80% fly ash + 20% BFS stabilized sample for different percentages of lime.

Variation of UCS value with drying period for 70% fly ash + 30% BFS stabilized sample for different percentages of lime. Variation of UCS value with drying period for 60% fly ash + 40% BFS stabilized sample for different percentages of lime. Variation of UCS value with drying period for 50% fly ash + 50% BFS stabilized sample for different percentages of lime.

Variation of UCS value with curing period for 40% fly ash + 60% stabilized BFS sample for different percentages of lime. Variation of UCS value with curing period for 30% fly ash + 70% BFS stabilized sample for different percentages of lime. Variation of UCS value with curing period for 20% fly ash + 80% stabilized BFS sample for different percentages of lime.

Variation of UCS value with drying period for 10% fly ash + 90% BFS stabilized sample for different percentages of lime. Change in UCS value with curing period for 30% fly ash + 70% BFS stabilized sample for different percentages of RBI 81 grade. Change in UCS value with curing period for 20% fly ash + 80% BFS stabilized sample for different percentages of RBI 81 grade.

Variation of UCS value with curing period for 10% fly ash + 90% BFS stabilized sample for different percentage of RBI grade 81. Comparison of UCS value for RBI and Lime at 2% and 6% for different BFS composition and flying ash for 7 days of healing. Comparison of UCS value for RBI and Lime at 4% and 8% for different compositions of BFS and fly ash for 7 days of curing.

Comparison of UCS value for RBI and Lime at 2% and 6% for different compositions of BFS and fly ash for 60 days of curing. Comparison of UCS value for RBI and Lime at 4% and 8% for different compositions of BFS and fly ash for 60 days of curing.

References

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