Subbase Stabilization - Jubail, Saudi Arabia

Subbase Stabilization


Project Description: Terratech used T-PRO® 500 polymer to improve engineering properties of subbase materials and minimize wind erosion of local soils.

Project Objectives: Due to the poor engineering properties of indigenous soil materials in Saudi Arabia, marl is used to improve strength characteristics an create a load bearing subbase for road construction. Marl is a type of soil formed from calcite that had precipitated from water saturated with calcium carbonate. Marl soils are generally coarse grained and non-plastic. Their non-plastic nature makes them susceptible to erosion and significant strength loss when wet. Infusing marl with polymer increases bearing capacity and reduces erosion from strong desert winds which degrade compacted embankments. Improving the engineering properties of marl through polymer stabilization will greatly reduce the maintenance costs associated with road construction in the Saudi Arabia. Post construction, California Bearing Ratio (CBR) test was perfomed on treated and untreated soil areas. Polymer treated marl soil showed a dramatic improvement in strength and bearing capacity when compared to untreated soil. The field CBR values for treated soil areas were 45% higher than those for untreated areas. The bearing pressure over the treated soil was 44% higher than the bearing pressure carried by the untreated soil.

Equipment Used: Grader, Water Truck with Hose Attachment, Tractor with Harrowing Disk Attachment, Vibratory Compactor.

Application Specifications: Infused application with polymer concentrations at 1.25%. All sections sealed with a 110 ft2/gal topical seal coat.

Maintenance Requirements: Re-compaction of loose material and topical re-application of polymer seal coat, as necessary.

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Dust Control - Solar Energy Generation


Solar Energy Generation - Dust Control

Phoenix, Arizona

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Project Description: Terratech T-PRO® 500 polymer was used to control fugitive dust on a newly build gravel road.

Project Objectives: The property developer wanted to control dust generation during the construction of the site access road for a proposed photovoltaic solar energy plant. The 18-month construction period is anticipated to bring over 70,000 trucks onto this unpaved road. The road is engineered to be an all-weather surface that will retain bearing capacity during the winter and control dust during the summer months. High heat and dry conditions are anticipated and a quarterly maintenance schedule is proposed to control particulate emissions that may arise from construction traffic. The road itself is constructed from import Class II base and in accordance with project specifications.

Equipment Used: Grader, Water Truck with Spray Bar, Smooth Drum Roller.

Application Specifications: Initial topical application at a coverage rate of 70 ft²/gallon.

Maintenance Requirements: Removal of loose material from surface and quarterly re-application of polymer seal coat at a coverage rate of 200 ft²/gallon.

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Petroleum Refinery Client - Pennsylvania


Project Description: Terratech reduces costs of regulatory compliance by working in conjunction with major oil refineries in an effort to decrease the hydraulic conductivity of secondary containment structures. The secondary containment structures consist of earth berm dikes constructed around tank perimeters. These structures must be sufficiently impermeable to contain a potential spill for a minimum 72 hour period during which clean-up activities can take place. All secondary containment structures must meet regulatory hydraulic conductivity standards (k≤ 1 x 10-6 cm/sec) in order to prevent product release into the environment.

Project Objectives: Terratech products were chosen as the only viable alternative capable of effectively and inexpensively decreasing permeability of the existing containment areas. Other dike retro-fit methods were too costly and logistically difficult to implement due to interference from above ground pipework and existing structures. Because the polymer solution could be applied topically and from a portable mixing tank, Terratech polymer technology was the only solution which met the regulatory criteria, was easy to install, and required no downtime or removal of structures.

Equipment Used: Mixing tank with distributor hose for manual application.

Application Specifications: Engineered for site specific soil permeabilities and to comply with regulation.

Maintenance Requirements: Annual topical re-application water/polymer concentration.

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Railway Sand Drift Abatement - Abqaiq, Saudi Arabia

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Project Description: Terratech used T-PRO® 200 polymer to minimize erosion and shifting of sand berms along nearly 200Km of track for the Saudi Rail Organization (SRO).

Project Objectives: High winds in the Arabian desert cause blinding sandstorms. Those same winds erode protective containment berms along high traffic rail lines and deposit sand on the tracks. Shifting sands are a constant maintenance problem and safety hazard for the SRO. Terratech used T-PRO® 200 acrylic copolymer along several sections of rail to topically treat the sand containment berms. Extensive laboratory testing and site trials determined the proper water/ polymer solution to penetrate deep into the sand and create a hard, wind resistant, crust.

The polymer treated surface will keep the sand in place and reduce sand migration and reduce deposits from accumulating on the tracks . T-PRO 200 has been tested to withstand surface wind velocity greater than 100 miles per hour with no deterioration of surface crust. The T-PRO 200 polymer is an eco-friendly alternative to the crude oil previously used to stabilize the containment berms. Polymer stabilization will reduce the frequency and scope of maintenance work from monthly sand clearing and sweeping to 18 months between applications.

Equipment Used: High Capacity Pump/Spray System

Application Specifications: Berm sections treated with a cost effective and highly durable coverage rates specifically designed for this application.

Maintenance Requirements: Topical re-application of polymer every 18 months or as necessary.

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Helicopter Pad Construction - Casar de Caceres, Spain


Project Description: Terratech constructed a helicopter landing pad using a heavy infused polymer application over decomposed granite and in-situ soil materials.

Project Objectives: Terratech used polymer stabilization to construct a tough wear course capable of withstanding wind erosion and surface abrasion caused by landing helicopters. A heavy dose of T-PRO® 500 polymer was used to develop bearing capacity and high-strength bonding between course and fine soil particles. The existing soil was milled and blended with the polymer solution to a homogeneous mixture and then compacted in place. A final seal coat was hand applied with a pressurized pump system and a fire hose. The mix of existing soil and well-graded course grained material created a smooth surface finish for the landing pad.

Equipment Used: Grader, Tractor with Harrowing Disc Attachments, Water Truck with Pressurized Spray Bar, Smooth Drum Roller, Vibrating Pneumatic Roller.

Application Specifications: Infused application with T-PRO® 500 polymer dosing at 2.0% by total weight of material treated. All sections sealed with a topical seal coat at a coverage rate of 100 ft²/gal.

Maintenance Requirements: Removal of loose material from shoulder surface and topical re-application of polymer seal coat at a coverage rate of 115 ft²/gal.

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