1 / 18

Lime Applications for Soil Stabilization: Benefits and Techniques

Explore the definitions, properties, and applications of lime in soil stabilization, including its benefits such as improved workability, resistance to traffic and water, and reduction of clay activity.

sroka
Download Presentation

Lime Applications for Soil Stabilization: Benefits and Techniques

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. LimeStabilization • Lime : Definitions – Properties – Applications • Treatment Techniques in Europe • Tremti 2005 : Introduction • Tremti 2005 : Lime Treatment Feed Back Daniel Puiatti March 2Oth, 2006 daniel.puiatti@lhoist.com

  2. LimeDefinitions -Properties - Applications Daniel Puiatti March 21st, 2006 daniel.puiatti@lhoist.com

  3. Synopsis • Part I: Definitions • Part II:Lime Properties • Part III:Lime Applications daniel.puiatti@lhoist.com

  4. Definitions (1) Calcium Air lime • Produced by calcination of limestone (T > 900°C) • Slowly hardens in the air by combination with CO2 Hydraulic lime • Produced by calcination of clayey or siliceous limestone(T > 1000°C) • Hardens with water daniel.puiatti@lhoist.com

  5. CaO Calcium oxide Quicklime T > 900°C + Water CaCO3 Calcium carbonate Limestone + CO2 Ca(OH)2 Calcium hydroxide Hydrated Lime Definitions (2) : Calcium air lime cycle daniel.puiatti@lhoist.com

  6. Synopsis • Part I: Definitions • Part II:Lime Properties • Part III:Lime Applications daniel.puiatti@lhoist.com

  7. Lime Properties (1) • Hydrate : Chemical BaseCa++ + 2OH- • Ca++ • pH • Quicklime hydrationCaO + H2O => Ca(OH)2 + heat daniel.puiatti@lhoist.com

  8. Lime Properties (2) • Hydrate : Chemical Base • Multi-Functional Modifying Agent • Clayey materials • Aggregates • Bitumen • Chemical reagent for « cementitious » reaction • Clay • Fly Ash • Limestone • Blast Furnace Slag • Quicklime hydration • Moisture reduction of wet soils or materials daniel.puiatti@lhoist.com

  9. (1% CaO may reduce water content by 1 to 5% by mass of wet soils depending on weather and mixing conditions) Wn PI • Immediate reduction of the clay activity due to the flocculation CBR Example : Lime action on wet clayey soilsShort term (1) • Immediate reduction of the water content • Improvement of the bearing capacity. Immediate Improvement of the Workability daniel.puiatti@lhoist.com

  10. Before Lime Treatment After Lime Treatment Example : Lime action on wet clayey soilsShort term (2) Immediate Improvement of the Workability ! daniel.puiatti@lhoist.com

  11. Gradual hardening of the mixture thanks to bonds formed during the pozzolanic reaction between clay & lime Without lime With lime Example : Lime action on wet clayey soilsMiddle to long term (1) Better Resistance to Traffic, Water, Frost daniel.puiatti@lhoist.com

  12. Water + high pH Ca++ Clay (SiO2 + Al2O3) Ca++ CSH CAH = + Ca++ Ca++ Example : Lime action on wet clayey soilsMiddle to long term (2) Pozzolanic reactions with clayey soils Ca++ + SiO2 + H2O = Hydrated Calcium Silicate (CSH) Ca++ + Al2O3 + H2O= Hydrated Calcium Aluminate (CAH) daniel.puiatti@lhoist.com

  13. Benefit of Lime action on wet clayey soils (1) • Reduction of the swelling potential of the clay • Reduction of the risk of settlements • Increase of the cohesion • Resistance to water and frost • Increase of the mechanical performance(Rc, Rt, E) = f(type of soil, temperature, time) daniel.puiatti@lhoist.com

  14. Evolution of shear strength(Lime treated silt : PI = 14 ; CaO = 2%) Benefit of Lime action on wet clayey soils (2) daniel.puiatti@lhoist.com

  15. Synopsis • Part I: Definitions • Part II:Lime Properties • Part III:Lime Applications daniel.puiatti@lhoist.com

  16. Roman Roads(3rd Cent. BC to 4th Cent.) Lime in structures is a long story ! daniel.puiatti@lhoist.com

  17. Lime Applications • Soil Treatment • Soil improvement (embankment) : milled quicklime • Soil stabilization (capping layer, platform) : milled quicklime and slurry • Hot Mix Asphalt (HMA) – Cold Mix Asphalt (CMA) • Adhesion improvement between acidic aggregates & bitumen • Bitumen stiffening and age hardening reduction • Reagent mixed with industrial by-productsfor the production of hydraulic binders • Fly ash • Blast furnace slag • Component of specific mortars • Tunnels • Soil injections daniel.puiatti@lhoist.com

  18. Soil Treatment Stabilization (Platforms) Improvement (Earthworks) before lime after lime Roadworks Pavement Capping layer Earthworks Embankment Lime Applications : Soil Treatment daniel.puiatti@lhoist.com

More Related