• Required qualification: the work must be carried out by an LL-TEQ™-accredited contractor.
• LL-TEQ™ supplier: provides the products; trains and accredits contractors; supervises and teaches the parameters on the first jobsites; technical support.
• LL-TEQ™-accredited contractor: once accredited, independently determines and applies the dilution and dosage; executes the procedure in accordance with this SOP; provides the OMC and site conditions; operates the equipment; validates preparation, compaction and reopening.

Materials

• LL30: structural product, integrated into the soil. No mixing before use; visual inspection before use.
• LL25: seal coat, applied on the surface.
• In-place material: compatible native soil or granular base (construction); milled asphalt (RAP) + existing base (rehabilitation). Not frozen, free of harmful organic matter.

Equipment (or equivalent providing a compliant finish)

• Stabilizer / cold recycler with a computerized emulsion system required (e.g. CAT RM400 or RM500).
• Grader (e.g. Caterpillar 140).
• Water truck / tanker of about 15,000 L (4,000 gal) (e.g. Freightliner M2 106), fitted with a pump, 3 in or larger hose/outlet. Connected to the stabilizer for integration, then surface spraying of LL25 via the rear bar.
• Push bar on the stabilizer to push the water truck.
• 3 in trash pump to transfer LL25 and LL30 into the water truck.
• Compact loader (skid steer) with a 5 ft bucket (e.g. Bobcat S450) for areas the stabilizer cannot reach.
• Double steel drum roller.
• Vibratory plate, pumps, hand tools (manual areas).

On receipt, cover the products and protect them from sun and frost. Conditions for LL30 and LL25:

• Original or compatible container, clean, labelled, hermetically sealed.
• Out of direct sunlight; cover the products on receipt.
• Protect from frost (products are frost-sensitive before installation); store > 5 °C and < 44 °C.
• Away from excessive heat and any contamination.
• Shelf life: 12 months unopened / 6 months after opening.
• No mixing or re-mixing before use, even after prolonged storage.
• Before use: visual inspection; product in good condition, unaffected by frost or a freeze-thaw cycle.
• Any visibly contaminated or altered product must not be used without supplier approval.

The contractor determines and applies the dilution and dosage per LL-TEQ™ procedures. On the first (supervised) jobsites, these parameters are given and taught by LL-TEQ™; the contractor then applies them independently once accredited.

• OMC measured per the ASTM method.
• Moisture target: at OMC for most soils; below OMC for clay soils (depending on the concentration to be adjusted).
• OMC check every 25 m behind the stabilizer.
• As a guideline: about 75% of the time, the OMC is between 6 and 12%.

Phase 1 — Preparation

• Strip vegetation and organic matter (clear & grub).
• Excavate as needed: remove excess soil or poor material to reach the target rough grade.
• Import and place a granular base as needed (construction). In rehabilitation: recycle the asphalt and existing base with the stabilizer, with no import.
• Condition the moisture if required.
• The substrate must be stable, validated by a proof-roll. If there is deflection, compact until stable. On a new road, if the structure is already stable, it need not be compacted before stabilization.

Phase 2 — Installation

• Integration: integrate LL30 with the stabilizer to the target depth (50 to 200 mm depending on the project). Work on a stable substrate.
• Shaping: the grader follows directly behind the stabilizer; shape according to the project geometry.
• First compaction: double drum roller; it protects the surface, particularly in case of rain. In case of rain, push this first compaction to 95%+ without delay.
• Finish grading: a further grader pass for final surface adjustment.
• Final compaction: compact in cross passes to 95%+. Compaction verification is the accredited contractor's responsibility, by appropriate means.
• Delay before sealing: wait 2 h after final compaction before applying the seal coat, to let the surface harden, since the water truck is heavy and would mark a surface that is too fresh.
• Sealing (LL25): apply the seal coat to uniform saturation, over the whole surface including the manual areas.

Phase 3 — Cure and reopening to traffic

• LL-TEQ™ cures by evaporation: the time depends on conditions. Humid, rainy or overcast: longer cure; hot and dry: faster cure.
• Minimum 12 h before reopening to traffic, and more depending on conditions, typically on the order of 24 to 72 h if drying is slowed.
• Reopening criterion: the surface is no longer at all tacky to the touch. As long as it stays tacky, extend the cure.
• Reopening at the accredited contractor's judgement.

Phase 4 — Equipment cleaning

• Water truck: wash with water, hoses included.
• Stabilizer: drain and rinse with water for 5 to 10 minutes for a complete cleaning.
• The products are water-based: rinse before drying (dried product forms a film that is hard to remove).
• Rinse water: may be sprayed onto the verges (sides) for dust control if desired. Never rinse or spray water onto the freshly treated surface: curing is about driving off moisture.

• Substrate not frozen and stable.
• Ambient and substrate temperature > 5 °C during operations.
• Do not work in the rain.
• LL25 requires at least 3 h without rain after application.
• Do not work on a saturated or waterlogged substrate.

Ref.: LL30 (TECH-21) and LL25 (TECH-20) Technical Manuals. Implementation example: SOW Rue Scapa, Joliette.