Description:

Successful application consists of placing a mixture of aggregate, Permazyme 11X and water on a prepared surface in accordance with specifications shown on the plans.

No provision is made herein to address site conditions such as load-bearing capacity of the subbase, ground moisture, drainage or climate.

The road should have a properly engineered design prior to the start of construction.

Materials:

The aggregates shall conform to the requirements of a modified grading as shown below:

The Liquid Enzyme Stabilizer shall be PERMAZYME 11X. Permazyme 11X consists of a muti-enzymatic formulation containing water, fermented organic compounds and other proprietary ingredients. Permazyme can be used effectively over a wide range of soil gradation mixes (aggregate sizes), as can be seen from the above graph. 

Materials containing approximately 20% cohesive fines (non-granular) have been found a satisfactory target. However, excellent results have been achieved outside this range.

Additionally, the soil should contain a wide range of material sizes to provide shear strength and internal friction which increases load bearing values.

Permazyme has proven effective over a wid range of soil types. This range continues to expand as Permazyme is used in more diverse locations throughout the world.

The Contractor may make any adjustments in the material which may include, but not be limited to, increasing colloidal fines or reducing the amount of material passing a #200 sieve as directed by the engineer or consultant.

Construction:

The aggregate, water and Permazyme 11X shall be mixed and placed by the following method.

Preparation of Surface:

The in-place soil to be stabilized must be ripped, scarified, disced or rototilled into a well-pulverized mixture. If the stabilization area involves the treatment of heavy clay soils, the Project Representative may specify the use of a cross-shaft rotary mixer to assure proper pulverization and mixing. If the material to be treated is already at or above optimum moisture content, it must be dried to four percentage points below optimum in preparation for addition of the Permazyme solution. Do not prewet the soil material ahead of applying the Permazyme solution. When filling the water truck, add enzyme to water to avoid a truck full of foam. No mixing is necessary.

Application of Stabilizer:

Application of the Permazyme 11X solution should be limited to the area specifically shaped and sized to receive the solution. The daily extent of work should be limited to an area the size of which allows all operations, including mixing and compaction, to be continuous and completed in one day.

Permazyme 11X solution should not be applied or mixed with in-place material if atmospheric temperature falls below 50˚F/10˚C.

Application of the Permazyme 11X must be limited to periods when rainfall is not expected during the application or during the 24 hour period following application. If rainfall is encountered during application, stop construction.

The Permazyme 11X Solution is applied at the rate of one gallon per 150 cubic yards (1 liter per 30 cubic meters) of material to be treated. The variance from the specified dilution rate will be +/- ten percent.

The amount of water to be used should be calculated to bring the soil or aggregate material to be treated to optimum moisture content. Permazyme solution should be added in increments and mixing continued so as to carefully approach optimum moisture content.

In conditions where the in-place material to be treated is already close to optimum moisture content, be aware that no less than two percent moisture must be added as part of the Permazyme 11X solution in order to properly disperse the highly concentrated Permazyme 11X. In this case, a ratio of 1:500 gallons is recommended.

The Permazyme solution can be applied to the material to be treated with a pressurized spreader truck or a water truck with a pressurized spreader bar. Uniform distribution can be accomplished by thoroughly working the enzymed soil by blading, tractor drawn spike, disk, or harrows, or by using a mixing/grinding or pulveriizing machine, i.e., Asphalt Zipper, or similar.

Water should not be added to the material prior to adding the Permazyme solution. Mixing equipment shall follow no more than one quarter mile behind spray application truck.

If the entire Permazyme 11X solution has been added without achieving the range of allowable moisture content, more water may be added at a 1:10,000 dilution to bring it to the specified moisture range.

Compaction is the key to a perfect road:

Compaction operations can begin immediately following the shaping of the road. The moisture content of the material at the time of compaction shall not exceed nor be less than two (2) percentage points below the optimum moisture content. Compaction equipment should be capable of achieving compaction of the untreated material to a density no less than 95 percent of the density prescribed in ASTM D-1557-66T (Modified Proctor). 100% or more is frequently obtained with Permazyme 11X.

If site conditions warrant or compaction equipment is not of sufficient size, the road must be compacted in lifts of 3 to 4 inches maximum. However, with heavy road equipment, 6" lifts are standard. Prior to placing and compacting a second lift, the surface shall be pre-wetted to insure bonding between the lifts.

Upon completion, the surface should be smooth and in conformance with the typical sections, lines and grades of the design plans. The surface shall be properly sloped to allow runoff of surface moisture. The thickness of the compacted treated base material shall be six inches (15cm) or more. The compacted thickness should not vary one-half inch over the entire area.

Curing and Return to Service:

Following final completion, the prepared soil shall be allowed to cure for three (3) days. No surface watering or curing membrane is required during this period. If the surface must be rapidly returned to service under traffic, it should be dried-back adequately so that it is not susceptible to rutting or damage by rapid acceleration or braking. The completed road will continue to harden over an extended period. The cementaion effect of Permazyme in the soil is irreversible.

NOTE: No amount of compaction is too much.