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Soland Industry Ltd.

PROJECT OVERVIEW

Establishing Business plan, including technical operating factor for setting up the manufacturing operation for the production of geotextile membrance based on PET and PP polymers, used in the construction industry.

The geosynthetics industry has expanded rapidly in recent years, and the number and types of geotextiles manufactured with a specific focus in roadway design has increased dramatically. This increase has resulted in many new performance-enhancing and cost-saving design alternatives for roadways.

Traditionally, the use of geotextiles in pavement applications has addressed five main functions: separation, filtration, drainage, reinforcement, and mitigation of crack propagation. More recently, geotextiles have also been used to create a capillary break, acting as a barrier to moisture.

This research project was designed to determine the most pertinent properties of geotextiles when used in soil and base course of pavement for Texas conditions, provide Soland Industry Ltd. engineers a guide for selection and installation of appropriate geotextiles based on these properties, and promote this information to design engineers throughout the state. Significant opportunities for more cost-effective pavements are being missed by not using (or using incorrectly) geotextiles in pavement design. Soland Industry Ltd.’s geotextiles research was comprehensive enough, as it addresses one function and a single type of geotextiles.

Addressing the major applications of geotextiles in roadway design has been compiled as part of this study—a comprehensive literature review and survey of engineers on both the state and national level provided input throughout the project life.

In outlining the overall design approach, it is important to note a distinction between application and function. While a function refers to a fundamental process performed by a geotextile, an application (often a combination of multiple functions) refers to the specific purpose for placing the geotextile in a pavement system.

A geotextile is defined as a permeable geosynthetic made of textile materials. Among the different geosynthetic products, geotextiles present the widest range of properties and can be used for the widest variety of transportation applications.

Geotextile properties are generally categorized in the following groups: physical, mechanical, hydraulic, endurance, and degradation. Each group encompasses testing that characterizes a different aspect of geotextiles and their performance. In addition to these property groups, geotextile testing may be characterized as either index or performance. Index tests were used for general characterization of a geotextile product and did provide values that were directly used for design purposes, while performance testing provided information about the expected behavior of a geotextile in an engineered system. Index testing was performed on the geotextile alone, or in-isolation, while performance testing often involves both the geotextile and soil to be placed in an engineered system.

The proposed Installation Guidelines were provided. Recommendations for installation did not vary for each proposed application. The terminology used throughout this project to characterize related groups of applications is also applicable for installation. As a result, three sets of installation guidelines were proposed: Subsurface Drainage, Pavement Structural Section, and Construction Access. The guidelines were intended to serve as a baseline set of considerations, subject to change, whether through the addition of more material or removal of existing material, based on particular site conditions and project requirements. Consistent with the scope of this project, the basis for the information provided was obtained from documented installation guidelines. While this information is thorough, expanding beyond available documents is beyond the scope of this project and would require collecting undocumented best practice information or performance monitoring of constructed projects.

 

 

 

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