QC Manager Jorge Giro mixes Phoscrete in a paddle style mortar mixer for the 2021 Ohio NTPEP Test Deck installation.

NTPEP Field and Lab Reports

NTPEP Field and Lab Results: What the Data Shows About Phoscrete MPC

AASHTO’s Product Evaluation and Audit program (formerly NTPEP) published two-year field inspection results for Phoscrete F1-HC and F3-HC, along with 2023 lab reports for F3-HC and F3-VO. The results confirm what field crews have reported: Phoscrete holds up

 

F1-HC 2021 Ohio test deck inspection after 2 years

F1-HC 2021 Ohio test deck inspection after 2 years

 

F3-VO freeze/thaw image after 300 cycles

 

2021 Ohio Test Deck: Two-Year Field Inspection
In October 2021, the Phoscrete team installed test sections in Bowling Green, Ohio, under NTPEP protocols. ODOT personnel conducted inspections at one year and again at two years.

The two-year results for both F1-HC and F3-HC:

Zero delamination
Zero mid-panel cracking
For a durable concrete repair product competing in a DOT-witnessed field evaluation, that is the result that matters.

 

2023 NTPEP Lab Test Highlights

In July 2023, Phoscrete submitted F3-HC and F3-VO for laboratory evaluation. Results were published on the NTPEP DataMine in January 2024.

  • Set Time (ASTM C403)

Phoscrete F3 formulas reach final set in under 25 minutes. F3-HC is typically traffic-ready in 2 hours. The extended working time compared to F1 makes F3 the right choice for larger-volume repairs and warm-weather concrete repair conditions where working window matters.

  • Freeze-Thaw Resistance (ASTM C666, Procedure A)

Phoscrete F3 recorded greater than 99% durability with no mass loss and no change in surface condition after the full freeze-thaw cycle test. Phoscrete F3 Liquid Activator includes a dose of Phoscrete Endure for placement ease, with an additional Endure jug provided as a curing component for long-term durability.

  • Length Change and Shrinkage (ASTM C157)

Both F3-HC and F3-VO showed extremely low dry-cure shrinkage and minimal wet-cure expansion. Combined with Phoscrete’s bond strength data, these results are consistent with zero delamination and zero cold joint field performance.

Read the full reports at NTPEP DataMine (login required).

Our latest technical data guides can be found on our website:

 

F1-HC vs. F3-HC: Cold and Warm Weather Performance Compared

The choice between F1 and F3 often comes down to temperature conditions and required working time.

 Property  F1-HC  F3-HC
 Final Set @ 70°F  12 min  24 min

 Traffic Ready @ 70°F

 < 1 hour

 < 2 hours

 Working Temperature*

 > -5°F

 > 32°F

* Working temperature is based on the freezing point of the activator.

 

F1-HC is the primary cold weather concrete repair product in the Phoscrete line. Its working temperature floor of -5°F makes it the go-to formula for cold-weather concrete patchwork on bridges, pavements, and industrial floors where freezing conditions are a real risk. For concrete in cold temperatures where other repair mortars would stall, F1-HC keeps the job moving.

F3-HC is better suited to warm-weather concrete repair situations and large-volume placements where the longer working window reduces application risk. Cool the activator on ice in hot conditions to extend working time. Use slow-set admix when pumping or spraying.

 

 

Additional field guidance:

    • Use Phoscrete Fast-Set Admix with F1 to accelerate set time in cold conditions
    • Use Phoscrete Slow-Set Admix with F3 when pumping or spraying in warm conditions

 

Next Steps

Full test reports are available on the NTPEP DataMine (login required). Current technical data guides for F1-HC, F3-HC, and F3-VO are published on the Phoscrete technical documentation page.

Contact a Phoscrete sales engineer to discuss which formula fits your application conditions.

 

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