Manhole rehabilitation

Strong-Seal · Fast repair

QSR Fast-Acting Repair Mortar

A fast-setting, hand-applied mortar for manhole benches, inverts and voids. Patch it, and storm runoff can return in 2 to 4 hours.

minutes to final set

15–30

psi compressive strength in 1 hour

1,000+

to storm runoff

2–4 hr

Fix benches, inverts and voids fast

Mix it by hand, place it by hand. QSR is a calcium aluminate repair mortar with fiberglass reinforcement. Use it to rebuild worn benches and inverts and fill voids, on its own or before a Strong-Seal^® liner.

5–15 min

Working time

Mix only what you can place in 15 minutes. Final set in 15 to 30 minutes.

3,000+ psi

At 28 days

Over 1,000 psi in 1 hour and 2,000 psi in 24 hours.

QSR-BAG 50 lb bag · QSR-PAIL 40 lb pail

2,000+ psi

Bond strength

Bonds to concrete and masonry at 28 days. 0% drying shrinkage.

pH 2

Corrosion resistant

Calcium aluminate cement, formulated for pH 2.0 and higher.

Three repairs, one bag

Each one goes on by hand or trowel, over a clean, damp surface.

Invert repair

Apply firmly by hand or trowel, up to 1″ per pass, starting from the bottom of the invert. ½″ minimum total.

Bench repair

Slope the bench from the walls to the invert or center, ½″ minimum at the center. Round the wall and bench joint to an even radius.

Void repair

Pack it in firmly by hand or trowel until the void is filled completely.

Five steps to a repaired manhole

1 Bypass

Plug or bypass incoming connections.

2 Clean

Pressure wash to a sound surface, 3,000 psi minimum. Remove loose brick, mortar and concrete.

3 Stop leaks

Stop active leaks with Strong-Plug®. Some leaks may need weep holes.

4 Mix and place

Use 4 to 5 fluid ounces of water per pound, water first. Place on a damp surface with no running water.

5 Finish and cure

Trowel smooth, then wet brush. Keep it damp for 72 hours if humidity is under 70%, or use an ASTM C309 curing compound.

Back in service: storm runoff and surcharge after 2 to 4 hours. Force main impact after 4 to 6 hours.

Part of a full manhole rehab

QSR is the middle step. Stop the leaks first, patch with QSR, then line the structure with a Strong-Seal^® liner.

Before QSR, stop the leaks

Strong-Plug^®

Sets in under a minute and hardens on contact with water. Once it sets, you can line right over it.

See Strong-Plug ›

After QSR, line the structure

Strong-Seal liners

Spray MS-2^®A, MS-2^®C or High Performance Mix over the repaired structure to stop infiltration and restore strength. Pick by how much corrosion you see.

See the liners ›

Meet Fernco Infrastructure

An overview of our manhole rehabilitation and trenchless pipe repair solutions.

Technical data

Specifications

Part numbers	QSR-BAG (50 lb bag, 40 per pallet), QSR-PAIL (40 lb pail, 42 per pallet)
Compressive strength (ASTM C109)	Over 1,000 psi at 1 hour, 2,000 psi at 24 hours, 3,000 psi at 28 days
Bond strength (ASTM C882)	Over 2,000 psi at 28 days
Drying shrinkage (ASTM C596)	0% at 28 days, 90% RH
Working time	5 to 15 minutes
Final set	15 to 30 minutes

Yield	0.57 ft³, or 13.8 ft² at ½″ thick (bag); 0.46 ft³, or 11.0 ft² (pail)
Rated to	pH 2.0 and higher
Made with	Calcium aluminate cement, pozzolans, lightweight aggregate and alkaline-resistant fiberglass
Water	4 to 5 fluid ounces per pound
Mixing	By hand, spoon, trowel or handheld drill in a clean pail or bowl
Typical structures	Benches, inverts and voids in manholes, tanks and containment, tunnels and pipelines, wastewater facilities

FAQ

Common questions

Can I line over QSR?

Yes. QSR is made to repair benches, inverts and voids before Strong-Seal^® liners are applied.

How much can I mix at once?

Only what you can place within 15 minutes. Working time is 5 to 15 minutes.

How thick?

Up to 1″ per pass, with ½″ minimum total at the invert or bench center.

When can flow go back in?

Storm runoff and surcharge after 2 to 4 hours. Force main impact after 4 to 6 hours.

What weather can I apply it in?

Don’t apply below 40°F, on frozen surfaces, or if the surface could freeze within 24 hours. Keep the material under 90°F and the mix water under 80°F. Chill with ice if you need to.

How is it tested on the job?

Cast four 2″ cube samples each day, or for every pallet used, whichever comes first. Package, label and return them to the manufacturer for compressive strength testing per ASTM C109, following the owner’s or manufacturer’s directions.

For distributors

Interested in carrying Fernco Infrastructure?

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