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Using Enzymes in soil stabilization

Using Enzymes in soil stabilization. Roads. Terms Used in Road Construction. Terms Used in Road Construction. The Challenge faced when dealing with set Engineers:.

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Using Enzymes in soil stabilization

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  1. Using Enzymes in soil stabilization Roads

  2. Terms Used in Road Construction

  3. Terms Used in Road Construction

  4. The Challenge faced when dealing with set Engineers: • Existing pavement design methods cater to relatively high volumes of traffic with damaging effect quantified in terms of ESA (equivalent standard axles). In contrast, main factors controlling deterioration of LVRs (Low Volume Roads) are dominated by the local road environment and details of design (drainage), construction and maintenance practice. • Conventional specs apply to “ideal” materials • Standard methods of test do not always give a true assessment of performance of local materials

  5. Primary Problem faced: • “ The art of the roads engineer consists for a good part in utilizing specifications that will make possible the use of materials he finds in the vicinity of the road works. Unfortunately, force of habit, inadequate specifications and lack of initiative have suppressed the use of local materials and innovative construction technologies” • Consider materials’ “fitness for purpose” • Make specification fit materials rather than materials fit specification (“resource based” specs)

  6. Pavement Performace:

  7. Selection of material for construction: • Material strength derived from combination of: - cohesive effects - soil suction - physio-chemical (stab) forces - inter-particle friction • Material selection influenced by: - traffic loading - environment - material properties (plastic mod) - pavement configuration

  8. Wide variety of chemical additives available including: • Wetting agents to improve compaction • Hygroscopic salts (e.g. calcium, magnesium or sodium chlorides) • Natural polymers (e.g. lignosulphonates) • Synthetic polymer emulsions (e.g. acrylates) • Modified waxes • Sulphonated oils • Biological enzymes

  9. CBR versus stiffness

  10. Stiffness versus density

  11. Compaction/density/permeability

  12. Dry density vs Permeability

  13. Dry density vs Stiffness

  14. Benefits of “Compaction to Refusal”

  15. Effect of Surface Deflection on Seal Life

  16. Characteristics of Compaction equipment

  17. Road cross section on builtup

  18. Effect of DZ-1X on PI/CBR of Soil Untreated soil Soil with DZ-1X

  19. Sub-base design chart as per IRC-37

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