Cellular Concrete Contractor
servicing all of North America

Slipliner Backfill

Pacific International Grout Company can provide quality materials, state-of-the-art processes, and the expertise to cost-effectively satisfy the requirements of any slipliner grouting job.

For over twenty five years, Pacific International Grout Company has been dedicated to improving the standards of the grouting industry by inventing materials and processes which have exceeded specifications for strength, speed and cost-effectiveness.

Pacific International Grout Company provides slipliner grouting services that include:

  • Suggesting an appropriate low density cellular concrete for your job that can be easily mixed from materials readily available;
  • Designing effective systems to bulkhead the annular space between the existing pipe and the new liner;
    Supplying grout mixing, pumping and support equipment capable of delivering the correct slurry for specific job conditions;
  • Providing trained, experienced operators, technicians and supervisory personnel;
  • Diligently monitoring all operations and mixes using state-of-the art testing laboratories;
  • Developing systems for placement and sizing of injection lines, flow control, bulkhead interfaces, and efficient handling of water in the annulus.


The drain and sewer pipelines in many older cities have deteriorated to a point where serious leakage problems occur with alarming frequency. This results in sewage and other waste materials contaminating the ground water. Conversely, ground water infiltration may occur which greatly increases treatment costs. In addition, voids created by underground erosion cause surface soil-related problems such as pavement breakage and foundation cracking. These and other leakage-related problems can often be corrected by inserting a new pipe called a slipliner, inside a defective one. This process requires that the annulus, or space between the old and new pipe be carefully filled with grout material. Grout must withstand the pressures exerted by ground compression and not collapse the new liner. In addition, this material must be physically resistant to change when in contact with annular ground water.


In order to completely fill all voids, pipeliner grout must be mixed to flow like water. This means that a watertight seal must be installed at the end of the pipe to contain grout flow. Pacific International Grout Company will advise as to which system best suits the job requirements.


Pacific International Grout Company grouts are cement based, easy-to-use, quality tested, and made from materials which are readily available in any city. Using gravity feed or pumps, our grouting materials flow so easily that they can be placed in the liner annulus at distances over 500 feet from a single injection point. This causes a minimum of surface disruption. Densities and compressive strengths are designed for each particular job requirement and condition.

Grout materials developed by Pacific International Grout Company have several desirable properties:

  • Cement-based grout is mixed with maximum flow properties so that gravity feed injection is possible while maintaining adequate compressive strength.
  • Grouts are non-bleeding and non-shrinking.
  • To help prevent blockages, voids or other problems during application, our grouts have been designed to eliminate segregation and phase separation.
  • Grout can be mixed via transit or delivered dry so that densities can be adjusted on-site to accommodate differing job conditions such as fluidity, presence of ground water, compressive strength and void size.


Reliable, long term results in any refurbishing job can only be accomplished by use of the correct grout for the specific job conditions in which it is being applied.

In 1988, Pacific International Grout Company perfected a cellular concrete grout developed specifically for backfilling high density polyethylene (HDPE) slipliners. This patented grout material, LDB 662, contains properties that make it ideally suited for use in slipliner grouting.

LDB 662 is a proprietary process for backfilling pressure sensitive sliplined pipes. Fluidity and long-term protection of utilities result in reduced costs to the owner. LDB 662’s properties include:

Viscosity – LDB 662 flows easily into small areas and cracks in the annulus, as well as the voids created by leakage outside the defective pipe, even at low injection pressures.
Density – LDB 662 has sufficient weight to displace water and prevent floatation of the slipliner. Load-bearing density can be field-adjusted from 25 to 110 pcf depending on job requirements.
Non-shrinking – LDB 662 is non-shrinking, completely maintaining its volume in the annulus after hardening.
Compressive Strength – Once it sets, LDB 662 has enough compressive strength to protect against surface loading and buffer any contact which may occur between the liner and original pipe. Compressive strength can be varied on-site from 30 to 1,000 psi while maintaining maximum fluidity for low injection pressures.
Long Term Stability – LDB 662 resists deterioration due to environmental changes, including moisture and temperature.






Contact us to discuss your project.


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