Lime for Subgrade Stabilization (Tugas TJR UI)

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Christopher Kevinly - 1206223846

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Addition of CaO (Quicklime) into the soil

Used to improve the subgrade stiffness

Has been used since 1950s

Effective on clay soil

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Quicklime will reacts with water (either fromthe clay water content of added separately) toform Ca(OH)2

The Ca(OH)2 will increase the PH, which willpromote the creation of calcium silicates andaluminates .

Ca(OH)2 will also reduce the water content ofthe soil through heat generation and chemicalreaction

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CaO + H2O Ca(OH)2+ Heat

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Ca(OH)2+ H4SiO4 CaH2SiO4 2 H2O

Hydrated Lime Calcium SillicateHydrate

Pozzolanic MaterialIn Soil

CaH2SiO4 2 H2O + Heat CaH2SiO4 + 2 H2O

Will react furtherwith CaO or evaporated

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Aim: To determine the soil suitability with limestabilization, to determine the amount of limerequired and evaluating its capability for long-termweathering and loading.

4 Steps:

Soil Evaluation

Determine approximate lime demand

After treatment optimum water content and drydensity check

Do unconfined compression test.

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Generally, soil with at least 25% passing a 75micron screen and having a PI of 10 or greaterare candidates for lime stabilization.

Soil with organics content above 1-2% byweight may not be compatible with thisstabilization method

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Eades-Grim PH Test (ASTM D6276) is performed

Criteria: The lowest percentage of lime in soil that

produces a laboratory pH of 12.4 at section of thepH vs. lime percentage curve produced by thetest] is the minimum lime percentage forstabilizing the soil.

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Make a mixture of soil, lime, and water at theminimum percentage of lime as determinedfrom Step 2 (Eades-Grim test), using a water

content of OMC + 2-3%. Determine the OMCand MDD of the mixture using ASTM D 698procedures

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Prepare samples with water content 1% of theOMC.

Wrap the specimens in plastic wrap and seal in

an airtight, moisture proof bag. Cure the specimens for 7 days at 40C.

Subject the specimens to a 24 hour capillary

soak prior to testing. Do the UCT

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Scarify Subgrade

Spread hydrated lime / lime slurry / quicklime

Add water (for Quicklime and hydrated lime)

Mix the soil and the lime to a specified depth

Compact!

Maintain (water addition & compaction)

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Soil Stabilization. (n.d.). Retrieved September27, 2014.

http://www.hiwaystabilizers.co.nz/divisions

/hiway-stabilizers/stabilised-subgrades(Retrieved September 27, 2014)

AUSTAB Technical Notes (May 2004)

"Mixture Design and Testing Procedures forLime Stabilized Soil." LIME Technical Brief 1(2006): LIME technical brief. Web. 27 Sept.2014.