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Low-P Cement™

Low-P Cement: Low Permeability, Hydraulic Cement

When your project requires a low permeability, corrosion-resistant, fast-setting hydraulic cement, Rapid Set® Low-P™ is the solution. This single component, polymer-modified material eliminates the need for liquid latex and achieves 7-day strengths in only 3 hours.  Minimize downtime with fast-setting Low-P Cement and open up to traffic in 1 to 3 hours.  Mix Low-P Cement with water and aggregates to produce concrete mixtures with excellent performance and ease of use. The finished Low-P Cement concrete has exceptional long-life durability in harsh freeze-thaw conditions. Enjoy the easy-to-place, high slump, non-segregating formula. Low-P Cement is available in 2,000-pound super sacks and in bulk.  When used in a typical mix design, 2,000-pounds yields about 3 to 3.5 cubic yards of concrete.

Datasheet...

Datasheet

The Datasheet explains the performance and technical characteristics of Rapid Set® Low-P Cement™.  It also shows how to use Low-P Cement (i.e. surface preparation, mixing, placement and curing).

SDS

The Safety Data Sheet (SDS) outlines information and procedures for handling and working with Low-P Cement®.  It includes physical and chemical property information, potential hazards, emergency procedures and CTS’s contact information.

Specification

The Specification gives a detailed statement explaining the type of jobs to specify Low-P Cement® for, the scope of work, thicknesses, performance requirements and usage.

Standard Practices

Q: What is Rapid Set® Low-P™ Cement?
A: Rapid Set® Low-P™ Cement is a specialty formulated Rapid Set cement when incorporated into a concrete, the performance includes very low permeability, high durability and corrosion resistance. These attributes are highly desirable for structural repairs and bonded overlays in exterior and harsh environments (i.e. bridge decks, marine docks and parking garages).

Q: How does Rapid Set Low-P compare to Rapid Set® Latex Concrete (RSLMC), Latex Modified Concrete (LMC), Micro Silica and packaged cement-based high performance concretes?
A: Rapid Set Low-P Cement requires the addition of aggregates, water and in some cases a retarder such as citric acid. The resulting concrete will have the high performance of RSLMC at a cost similar to that of LMC or Micro Silica Fume concrete.

Q: Where can Rapid Set Low-P Cement concrete be used?
A: Rapid Set Low-P Cement concretes can be used in patching structural concrete, replacing/installing elevated deck joints and as wearing surface bonded overlays (bridge decks and industrial slabs).

Q: What is a typical mix design?
A: Rapid Set Low-P Cement has been produced, tested and proven using 572-lb, 611-lb and 658-lb mix designs. For thin bonded wearing surfaces, 3/8” stone should be considered with the stone to sand ratio (45% stone to 55% sand). For patching structural repairs with depths exceeding 2”, a traditional ¾” to 1” top size stone with the mix ratio favoring stone should be considered. Water to cement ratio will range between .42 and .45 with resulting slump range of 6 to 9 inch allowable. Note that the Rapid Set Cement by nature has a high water demand, about a third higher than what Portland cement requires to hydrate.

Q: What is the working time and how can I extend this?
A: Working time will vary depending on ambient temperatures. In cooler ambient temperatures, the working time will be 20 minutes where as in hot temperatures, it will be 10 minutes. Using a retarder such as citric acid can extend working time 20 to 40 minutes. Citric acid will act as a wetting agent and aids in clean-up. Cool water and materials will extend working time while hot water and materials will speed up working time. Do not exceed the designed amount of water to extend working time. This will cause segregation of the concrete.

Q: What is the temperature range that Rapid Set Low-P Concrete can be used?
A: Rapid Set Low-P concrete can be applied in ambient temperatures between 40° F to 95° F. However the existing surface and substrate temperatures must also be considered. In hot weather, cooling the substrate may needed to slow the hydration process. For freezing temperature applications, please contact your local CTS Cement Representative for more information.

Q: Does Rapid Set Low-P Cement concrete require special equipment for mixing, placing and finishing?
A: Rapid Set Low-P can be mixed with conventional equipment, but volumetric mixers are typically used for large placements. Direct deposit, conveyors and buggies can be used. Pumping will require additional retarders and machinery. Placing with roller screeds, hand strikes and self-propelled deck finishers are commonly used. Truss screeds can be used in small area applications. Scrub coating is not required for applications where proper surface preparation has been established. Traditional finishing tools are required.

Q: What surface preparation is required?
A: To establish a mechanical bond, all concrete surfaces need to be prepared with a minimum ICRI profile of #6. For elevated wearing surface overlays, hydro-demolition is highly preferred but sand blasted/shot blasted surfaces have been sufficient to establish a uniform bond profile for Rapid Set Low-P Concrete. Pull off tests can be started at 24 hours after placement, but preferably after 48 hours for better consistency of results.

Q: How do you cure Rapid Set Low-P Cement concrete?
A: Wet cure the concrete for a minimum of 2 hours or until 3,000 psi compressive strength. Wet cure involves maintaining a wet saturated surface starting as soon as it is possible to place burlap on the surface without damaging the finished surface. Wet burlap can be placed sometimes as soon as 10 minutes behind the deck finisher and as long as 25 minutes in cool weather. Other wet cure methods are available but must be approved prior to start of placement.

Q: How do traffic conditions affect the placement of Rapid Set Low-P Cement concrete? When can Rapid Set Low-P Cement concrete be opened for traffic?
A: Due to the fast setting nature of Rapid Set Low-P cement, tensile strength development occurs very rapidly. This will shorten the amount of time that vibrations from adjacent traffic lanes can be a factor to early age stress cracking in the concrete. The 572-lb Rapid Set Low-P Cement concrete mix design has proven to produce 3,000 psi in less than 3 hours. At 3,000 psi compressive strength, many states allow wearing surface overlays and patches on elevated decks to be open for traffic. Refer to your states regulations for conditions for opening to traffic.

Q: How is Rapid Set Low-P Cement packaged and where is it available?
A: Rapid Set Low-P Cement is available in bulk and super sacks. Rapid Set Low-P Cement is produced in Mexico, MO and Nazareth, PA.

Jobs & Applications

  • Rt 95 in Foxboro, MA, Aetna Bridge Co. and MassDOT (bridge overlay)
  • Rt 495 in Norton MA, Sealcoating, Inc. and MassDOT (bridge overlay)
  • Chestnut over I-70 in Downtown St. Louis, MoDOT, Modified (overlay)
  • Lafayette over I-55 in Downtown St. Louis, Concrete Strategies (overlay)
  • Sidney over I-55 in Downtown St. Louis, Concrete Strategies (overlay)
  • Pestalozzi over I-55 in Downtown St. Louis, Concrete Strategies (overlay)
  • Arsenal over I-55 in Downtown St. Louis, Concrete Strategies (overlay)
  • Utah over I-55 in Downtown St. Louis, Concrete Strategies (overlay)
  • I-44 over Meramec in Eureka, Concrete Strategies (overlay)
  • Eureka Frontage Road, I-44 & Rt 109 in MO, Kilian and Concrete Strategies (overlay)
  • Shawneetown Ford over I-44 in Union, MO, Kilian and Concrete Strategies (overlay)
  • Rt. A in Truxton, MO, Kilian and Concrete Strategies (overlay)
  • Pin Oak Creek in New Haven, MO, Kilian and XL Contracting (overlay)
  • Highway E Joachim Creek in Desoto, MO, XL Contracting (overlay)
  • 9th Street Ramp I-64 in St. Louis, MO, St. LouisBridge and XL Contracting (overlay)
  • Russell/Gravois over I-55 in St. Louis, MO, Concrete Strategies (overlay)
  • 12th Street over I-55 in St. Louis, MO, Concrete Strategies (overlay)
  • MaconCounty, Rt 3 in Macon, MO, MoDOT Dist. 2 (overlay)
  • Rt 61/67 at I55 in Festus, MO, RV Wagner and Concrete Strategies (overlay)
  • Rt 30 in Byrnes Mill, MO, XL Contracting (overlay)
  • Rt W in Byrnes Mill, MO, XL Contracting (overlay)
  • Rt 110 in Jefferson Co, MO, XL Contracting (overlay)
  • I-170 in St. Louis, MO, Concrete Strategies (overlay)
  • I-270 over I-44 in St. Louis, MO, Bangert Construction and XL Contracting (overlay)
  • Rt. AH over I-44 in St. Clair, MO, Concrete Strategies (overlay)
  • I-270 over Rock Road in St. Louis, MO, Bangert Construction and XL Contracting (overlay)
  • Loughborough over I-55 in St. Louis, MO, Kozeny Wagner and XL Contracting (overlay)
  • I-270 over Marine in St. Louis, MO, Concrete Strategies (overlay)
  • Rt. M in Niangua, MO, MoDOT Dist. 8 (overlay)
  • Rt. 65 in Springfield, MO, Pace Construction and MoDOT Dist. 8 (overlay)
  • Rt. H in Green Spring, MO, MoDOT Dist. 8 (overlay)
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TechnicalSupportWhether you’re working on a time-sensitive project and need answers, or evaluating and choosing the right cement products, or looking to achieve specific results, we are here to help. Get answers to your questions from our technical support team. Find and download useful information from our website. Ask us to help get your construction team up to speed by requesting a jobsite demonstration or educational seminars.

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ProductEvaluationLEED product evaluations summarize a product’s ability to contribute to a variety of LEED credits. These credits include Solar Reflectivity (SS7), Regional Materials (MR4), Recycled Content (MR5), VOC Content (EQ4) and Innovation in Design (ID1).

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