A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Rigid geogrid replaces lime to stabilize subgrade
In early 2002, the construction schedule for a 680 home subdivision just east of the Austin-Bergstrom International Airport in Texas was at risk. The developer and contractor anticipated the presence of soft, highly plastic soils at the proposed development site. Consequently, a chemical (lime) stabilization of all pavement subgrade soils was specified to mitigate the risk of poor support. The specified pavement cross section was comprised of 1.5 in. of Texas DOT Type D Hot Mix Asphalt Concrete (HMAC), over 8 in. of crushed limestone flexible base, and over 6 in. of lime treated subgrade soil. However, after having consulted a local geogrid distributor, the developer designed an equivalent performance pavement section replacing the 6-in. lime stabilised subgrade layer with a single layer of stiff, biaxial geogrid over 6 in. of moisture-conditioned subgrade. This option revealed multiple advantages versus traditional chemical methods. Geogrids are supplied in roll form and are easily handled and installed by one or two general labourers. They may be installed in almost any weather and perform as intended immediately. Furthermore, stiff biaxial geogrids are made from durable polypropylene that is inert to almost any soil chemistry. After completion of the geogrid section it became clear that the roads built over the geogrid stabilised subgrade are performing better than expected. The repeated heavy loads by material and equipment delivery trucks have not disturbed the pavement.
Rigid geogrid replaces lime to stabilize subgrade
In early 2002, the construction schedule for a 680 home subdivision just east of the Austin-Bergstrom International Airport in Texas was at risk. The developer and contractor anticipated the presence of soft, highly plastic soils at the proposed development site. Consequently, a chemical (lime) stabilization of all pavement subgrade soils was specified to mitigate the risk of poor support. The specified pavement cross section was comprised of 1.5 in. of Texas DOT Type D Hot Mix Asphalt Concrete (HMAC), over 8 in. of crushed limestone flexible base, and over 6 in. of lime treated subgrade soil. However, after having consulted a local geogrid distributor, the developer designed an equivalent performance pavement section replacing the 6-in. lime stabilised subgrade layer with a single layer of stiff, biaxial geogrid over 6 in. of moisture-conditioned subgrade. This option revealed multiple advantages versus traditional chemical methods. Geogrids are supplied in roll form and are easily handled and installed by one or two general labourers. They may be installed in almost any weather and perform as intended immediately. Furthermore, stiff biaxial geogrids are made from durable polypropylene that is inert to almost any soil chemistry. After completion of the geogrid section it became clear that the roads built over the geogrid stabilised subgrade are performing better than expected. The repeated heavy loads by material and equipment delivery trucks have not disturbed the pavement.
Rigid geogrid replaces lime to stabilize subgrade
Festes Geogitter ersetzt Kalk beim Verfestigen von Baugrund
Valero, S.N. (author)
2003
2 Seiten, 3 Bilder
Article (Journal)
English
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