SECTION 02245

LIME SOIL STABILIZATION

PART	GENERAL

SECTION INCLUDES

Excavation, treatment and placement of lime treated subsoil mix.

RELATED SECTIONS

Section [01400 - Quality Control] [01410 - Testing Laboratory Services]: Testing fill compaction.

Section 02205 - Soil Materials.

Section 02207 - Aggregate Materials.

Section 02222 - Excavating: General site and building excavation.

Section 02223 - Backfilling: General site and building backfilling.

Section 02225 - Trenching: Backfilling of utility trenches.

Section 02275 - Riprap.

Section 02923 - Landscape Grading: Filling of topsoil [and] [________] to finish grade elevation.

Section 03300 - Cast-in-Place Concrete: Concrete materials.

UNIT PRICE - MEASUREMENT AND PAYMENT

Lime/Subsoil Mix:

Basis of Measurement: By the cubic [yard] [foot] (cubic [meter] [________]) based on a lime/soil mix ratio of [____].

Basis of Payment: Includes supplying ingredient materials, [scarifying substrate surface,] mixing and placing where required, [placing geotextile fabric,] compacting and curing.

REFERENCES

AASHTO M216 - Lime for Soil Stabilization.

ASTM C977 - Quicklime and Hydrated Lime for Soil Stabilization.

ASTM D1633 - Test Method for Compressive Strength of Molded Soil Cement Cylinders.

National Lime Association (NLA) Bulletin 326 - Lime Stabilization Construction Manual.

SUBMITTALS

Submit under provisions of Section [01300.] [________.]

Submit mix design and materials mix ratio that will achieve specified requirements.

[Samples: Submit [10] [____] lb. ([4.5 [____] kg) sample of each type of fill, in air-tight containers, to testing laboratory.]

QUALITY ASSURANCE

Perform Work in accordance with NLA Bulletin 326 - Lime Stabilization Construction Manual.

****** [OR] ******

Perform Work in accordance with [[State] [Municipality] of [________] [Highways] [Public Work's] standard.]

Maintain [one copy] [[____] copies of [each] document on site.

ENVIRONMENTAL REQUIREMENTS

Do not install mixed materials in wind in excess of [10] [____] mph ([16] [____] Kph) or when temperature is below [40] [____] degrees F ([5] [____] degrees C).

PART	PRODUCTS

MIX MATERIALS

Coarse Aggregate Type [A1] [____]: As specified in Section [02207.] [________.]

Fine Aggregate (Sand) Type [A3] [____]: As specified in Section [02207.] [________.]

Subsoil: Type [S1] [____] as specified in Section [02205.] [________.]

****** [OR] ******

Subsoil: Existing reused.

Lime: [AASHTO M216 Grade [A] [B] [C].] [ASTM C977.]

ACCESSORIES

Curing Seal: [Asphalt emulsion primer.] [________.]

[Geotextile Fabric: [________________]; [________] manufactured by [________].]

EQUIPMENT

Equipment: Capable of excavating subsoil, mixing and placing materials, wetting, consolidation, and compaction of material.

LIME/SOIL MIX

Mix materials in accordance with [[State] [Municipality] of [________] [Highways] [Public Work's] standard.]

****** [OR] ******

Mix subsoil, lime, [sand] and aggregate in accordance with [________]. [Quantity of lime not to exceed [10] [____] percent of dry mixed materials by volume.]

Carefully add water to the mix to achieve a consistent mixture without lumping yet not create a wet plastic consistency.

Obtain [Owner] [Architect/Engineer] approval of the mix before proceeding with placement.

PART	EXECUTION

EXAMINATION

Do not backfill over frozen or spongy subgrade surfaces.

PREPARATION

[Coordinate requirements with piling operations].

EXCAVATION

Protect adjacent structures which may be damaged by this work.

Excavate subsoil to a depth sufficient to accommodate soil stabilization, construction operations, and [________________].

[Proof roll subgrade to identify soft areas and excavate those areas].

[Excavation not to interfere with normal [45] [____] degree bearing splay of any foundation.]

Remove lumped subsoil, boulders, and rock up to [1/3] [____] cu yd ([0.25] [____] cu m) measured by volume. Larger material will be removed under Section [02229.] [________.]

Notify Architect/Engineer of unexpected subsurface conditions. Discontinue affected Work in area until notified to resume work.

Correct areas over excavated [in accordance with Section 02222.] [________________.]

Stockpile excavated material in area designated on site and remove excess material not being reused, from site.

****** [OR] ******

Remove excavated material from site.

SOIL TREATMENT AND BACKFILLING

[Place geotextile fabric over subsoil surface, lap edges and ends.]

Site mix subsoil, backfill [and compact]. Wet the treated subsoil mix to achieve mix formulation and required stabilization.

[Place mix material in continuous layers not exceeding [12] [____] inches ([300] [____] mm) depth.]

Maintain optimum moisture content of mix materials to attain required stabilization.

Do not exceed [30] [____] minutes in placing adjacent mixed material.

Commence compaction of mix no later than [60] [____] minutes after placement.

Compact mix to [________].

[Slope grade away from building minimum [2] [____] inches in 10 ft ([150] [____] mm in 3 m), unless noted otherwise.]

Make grade changes gradual. Blend slope into level areas.

At end of day, terminate completed Work by forming a straight and vertical construction joint.

[Remove surplus mix materials from site.]

CURING

Immediately following compaction of mix, seal top surface with curing seal.

TOLERANCES

Top Surface of Fill: Plus or minus [one] [____] inch ([25] [____] mm) from required elevations.

FIELD QUALITY CONTROL

Field [inspection and] testing will be performed under provisions of Section [01400.] [01410.] [________.]

Compression test and analysis of hardened fill material will be performed in accordance with [ASTM D1633.] [________.]

If tests indicate Work does not meet specified requirements, remove Work, replace and retest.

Frequency of Tests: [________________].

SCHEDULE

Fill Under Slabs-On-Grade:

Fill to [____] inches ([____] mm) thick.

Fill Under [Asphalt] [Concrete] [________] Paving:

Fill to [____] inches ([____] mm) below finish paving elevation.

Fill to Correct Over Excavation:

Subsoil Mix: Flush to required elevation.

END OF SECTION