Geomembrane
A geomembrane is very low permeability synthetic membrane liner or barrier used with any geotechnical engineering related material so as to control fluid (or gas) migration in a human-made project, structure, or system. Geomembranes are made from relatively thin continuous polymeric sheets, but they can also be made from the impregnation of geotextiles with asphalt, elastomer or polymer sprays, or as multilayered bitumen geocomposites. Continuous polymer sheet geomembranes are, by far, the most common.
Manufacturing
The manufacturing of geomembranes begins with the production of the raw materials, which include the polymer resin, and various additives such as antioxidants, plasticizers, fillers, carbon black, and lubricants (as a processing aid). These raw materials (i.e., the "formulation") are then processed into sheets of various widths and thickness by extrusion, calendering, and/or spread coating.
Geomembranes dominate the sales of geosynthetic products, at 1.8 billion USD per year worldwide, which is 35% of the market. The US market is currently divided between HDPE, LLDPE, fPP, PVC, CSPE-R, EPDM-R and others (such as EIA-R), and can be summarized as follows: (Note that M m2 refers to millions of square meters.)
Podcasts:
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by Jim Byrnes
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by Jim Byrnes
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by Jim Byrnes
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by Jim Byrnes
That River
by: Jim ByrnesNo one ever loved that river, rain from
the highlands a mirror for the Cajun moon
A road without a memory of anything
that started out as blue
Well you can pour me like a jug of wine
Into the gulf of Mexico, honey
Unitil the end of time but no one ever loved
that river the way I love you
You move with your own rhythm
like a tide upon the river lightning on the Ponchatrain
The way you come to me at midnight
warm and naked as the rain
What were you whispering down at Natchez
Cause it muddied up my mind
About some great ocean going to make you
leave it all behind well, no one ever loved
that river the way I love you
You've got land above the salt line,
Bougainvillea in you hair
The barges poles for New Orleans
You said you'd leave without a care
But the rumour on the river is anything
that touches you will be free
but I know you can't be free
Well, you know you can never leave this river
without me
Your eyes them flash defiance, they will not wait
upon my word draw my eyes across the skyline
like some long and graceful bird
Your lips have known me better, honey
and that satin ball of fire turns to blue
I cannot leave this river, I will not leave this river
without you no one ever loved that river,