This application stabilizes the top 10 to 15 cm (4 to 6 inches) of the soil surface for increased strength, better bearing capacity and ride quality. The polymer is mechanically mixed with the soil, compacted in place, and the finished surface sealed with a topical coat of the polymer solution. The decrease in surface permeability from compaction and polymer agglomeration of the soil particles reduces wear, rutting, raveling, and general degradation of the soil surface from water infiltration and traffic.
For all infused applications, laboratory testing of soils is required. Laboratory testing is a quick and inexpensive method of determining soil properties, viability of the application, and proper dosing ratios. Testing optimizes performance prior to field installation and minimizes down-time during construction.
Preliminary Lab Testing Requirements
- Sieve Analysis (ASTM C136)
- Plasticity Index (ASTM D4318)
- Modified Proctor Test (ASTM D1557)
- UCS Test (ASTM D1633)
- Milling/reclaiming machine – CMI RS 650, Caterpillar RM-350, or equivalent equipment capable of milling to a depth of 15 cm (6 inches) such as a PTO driven tiller, or harrowing disc attachment
- Grader – with the proper blade attachment
- Water truck – with a pressurized spray bar designed to apply the product at a controlled rate
- Pneumatic Roller
- Vibratory steel drum roller – preferably a dual drum, with a minimum 10-12 ton capacity
Construction Quality Assurance (CQA) Testing
Moisture content and soil density are continually tested during installation to maintain proper compaction. A nuclear density gauge is used to perform testing. Terratech personnel provide on-site CQA supervision for third party testing and technical support during the installation process.
Dosing ratios are site-specific and vary widely based on soil properties, traffic, and drainage conditions. Polymer concentrations are based on Unconfined Compressive Strength (USC) test results. The amount of polymer to be added is calculated as a percentage of total soil volume to be stabilized and typically ranges from 0.5% to 2% polymer by weight.