Liquid containment is an important factor in all construction sites and ensuring the site will hold the required liquid is critical.
Polyfabrics Australasia offers expertise and understanding across all stages of the containment construction process, and can provide comprehensive geosynthetic products, service and direction for your project. Polyfabrics Australasia’s geosynthetic containment solutions provide one or more of the following seven functions: separation to maintain the integrity of adjacent soil types, drainage to allow the free passage of water, filtration to prevent leaching of soil particles, reinforcement to provide additional strength, barrier for the containment of liquids, protection of the structure and barrier and erosion control to prevent soil movements from water flow.
While the containment layer historically utilised some form of natural clay resources, these materials are not readily available and geosynthetic alternatives are a must.
Containment construction tends to follow a very clear step by step process of installing layers and drainage systems to prevent leakage of liquids. The steps of this process include:
This first step in a typical operation, establishes the overall shape and design of the containment.
Installing the Geosynthetic Clay Layer (GCL)
This first layer acts as reinforcement of the base. Important aspects to consider in this stage are the swell index and the fluid loss index.
Installing geosynthetic and geomembrane materials
This is the most important phase in the construction of the containment and is the source for three different applications:
The original design and the strength of the site is determined by Bentonliner® GCL which is anchored in a trench around the perimeter of the containment basin. This part of the GCL provides the necessary pullout resistance for the plant. For further reinforcement, the HDPE geomembrane is installed before being sealed and protected by a combination of geotextiles and drainage composites.
Drainage passages for liquids and overall reinforcement is achieved through TerraTex® and TenDrain®.
Collection and Drainage Mechanisms
To prevent a build-up of liquids, it is collected through a chemically resistant HDPE Agflo® piping network and efficiently transported to a pond. A drainage stone blanket that is installed along with the pipe, assists the flow of liquid and creates a void between the waste and piping network.