lecture22

Lecture22 - Lecture 22 Geosynthetic clay liners and geomembranes Geosynthetic materials Geotextiles filter fabrics Geogrids reinforcement materials

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Lecture 22 Geosynthetic clay liners and geomembranes
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Geosynthetic materials Geotextiles – filter fabrics Geogrids – reinforcement materials Geonets – drainage Geomembranes – containment Geosynthetic clay liners – containment Geopipe – buried plastic pipe Geocomposites – combinations of above Geo-Others – specialty products Source: Koerner, Robert M., 1998. Designing with Geosynthetics, Fourth Edition . Prentice Hall, Upper Saddle River, New Jersey.
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Timeline for geosynthetics Late 1950s – First use of geotextiles for erosion control 1960s – woven fabrics in use as geotextiles 1968 – First commercial product: needle-punch fabric by Rhone-Poulec Textiles in France Late 1970s – First non-woven geotextiles used in US imported from Netherlands Source: Koerner, Robert M., 1998. Designing with Geosynthetics, Fourth Edition . Prentice Hall, Upper Saddle River, New Jersey. Early historical information from: Hsu-Yeh Huang and Xiao Gao, 1999. Geotextiles. http://trcs.he.utk.edu/textile/nonwovens/Geotextile.html
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Geosynthetics - 1967 MR. MCQUIRE Ben - I just want to say one word to you - just one word - BEN Yes, sir. MR. MCQUIRE Are you listening? BEN Yes I am. MR. MCQUIRE Plastics. BEN Exactly how do you mean? MR. MCQUIRE There is a great future in plastics. Think about it. Will you think about it? BEN Yes, I will. MR. MCQUIRE Okay. Enough said. That's a deal. “The Graduate” 1967
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Historical growth in geosynthetic market Geotextiles Geomembranes Geocomposites Geonets Geogrids Geosynthetic clay liners 500 450 400 350 300 250 200 150 100 50 0 1970 1972 1974 1976 1978 1980 1982 1984 Year Adapted from: Koerner, Robert M. Designing with Geosynthetics. 4th ed. Upper Saddle River, New Jersey: Prentice Hall, 1998. Quantity Mi ll io ns of Sq ua re Me te rs 1986 1988 1990 1992 1994 1996
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Historical growth in geosynthetic market Geotextiles Geomembranes Geocomposites Geonets Geogrids Geosynthetic clay liners 700 600 500 400 300 200 100 0 1970 1972 1974 1976 1978 1980 1982 1984 Year Adapted from: Koerner, Robert M. Designing with Geosynthetics. 4th ed. Upper Saddle River, New Jersey: Prentice Hall, 1998. Sales Mi ll io ns of Do ar s 1986 1988 1990 1992 1994 1996
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EPA regulations for geosynthetics 1982 – RCRA regulations require FMLs 1982 – single geomembrane 1983 – double geomembrane 1984 – primary geomembrane, secondary composite 1985 – geonet for leachate collection 1987 – primary composite, secondary composite
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Composition of geomembranes Geomembranes consist of: Polymers (plastics) Fillers Plasticizers Carbon black Additives Scrim reinforcement
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Plastics in geomembranes Thermoplastics Example: polyvinyl chloride (PVC) Thermoplastics soften upon heating and can be molded Thermoplastics can be heat welded at seams in the field
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Plastics in geomembranes Crystalline thermoplastic Also called semicrystalline Examples: HDPE, LDPE, polypropylene Polymeric chains are folded in a crystal lattice Folded chains form lamellae (plate-like crystals)
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This note was uploaded on 12/06/2011 for the course ESD 1.34 taught by Professor Petershanahan during the Spring '04 term at MIT.

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Lecture22 - Lecture 22 Geosynthetic clay liners and geomembranes Geosynthetic materials Geotextiles filter fabrics Geogrids reinforcement materials

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