Wednesday, March 9, 2011

My First House Checklist

Chapecó Hydroelectric, Dam with Asphalt Core in Brazil.


Located in the state of Santa Catarina in southern Brazil, the work of the hydroelectric plant Foz do Chapecó was executed by the construction company Camargo Corrêa and is a work of great economic movement for the region. Camargo Corrêa and Cyber \u200b\u200basphalt core methodology used in the construction of the hydroelectric dam Foz do Chapecó with total investment of over U.S. $ 1,150 million. With a capacity of 855 MW, the plant must meet 25% of the State's energy consumption.











the company's challenge assuming the work was to implement the execution schedule within 45 months, from January 2007 for the release of the first generating unit.
works Hydroelectric Plant Foz de Chapecó had started in December 2006. His last generating unit will be operational by the beginning of 2011. Against climatic and physical difficulties, the solution was to find technical alternatives that meet the requirements of time and quality. Among the solutions is to use the European method of construction of impervious asphalt core rockfill structure with replacing the conventional method in clay. Unprecedented in Brazil, the technique allows high productivity under adverse weather. Impervious core technology of asphalt was chosen due to difficulty of obtaining clay deposits near the work. Also because of the seasonality verified wet and dry periods, the timing of the barrier requires that it be fully implemented in the dry period, ie four to five months. This alternative minimized the risks involved in work schedule. In the dry season of the year, during the Brazilian summer, the southern region is exposed to heavy rains. With rigid schedule, the work could not be subject to the natural drying of clay material or possible reworking.
To complete the picture, the region has deposits of clay. The use of this material would require supply and transport from other areas of the state. The use of the asphalt mix made possible the application of two to three layers of 25 cm (about 10 ") thick every day, whether sunny or rainy weather. On rainy days, there was disruption of the work only partially in the rain, then clears immediately resumed.
A gravimetric asphalt plant, UAB 18 E Advanced model, produced by Ciber Equipamentos Rodoviários of Porto Alegre (Brazil) was the chosen equipment for the production of asphalt core in this new experience in Brazilian territory. The project specifications required the use this type of high-performance plant, which produces asphalt far superior, high control and assurance of the composition. Thus, the final dosing system, which enables the production of any mix, like SMA, with rubberized asphalt fibers and rubber, was instrumental in the purchase decision.
The project requires a large amount of asphalt binder, about 6.6% by weight of the asphalt mix. The high percentage of asphalt due to the need to reduce the gaps in the mix. The formula uses a vast amount of fine materials: both the fine aggregates (rock flour) that are recovered by the bag filter and return to process metering and mixing, such as dolomitic limestone, from a bin outside the facility that also passes through a metering and mixing process. The percentage of fine and filling is very large in accordance with the requirement of low percentage of voids in the asphalt mixture. Consequently, the specific weight of the mixture is close to 2.4 tonnes per cubic meter.
UAB 18 E Plant Advanced is an ideal choice for developers who work with project specifications and high standards of quality control. The work required a production of 300 tons per day and one of the requirements of the project is the minimum amount voids in the asphalt mix, depending on the rigor of waterproofing core rockfill dam, to get an efficient waterproofing. The gravity plant line Ciber has been developed continuously since the first model manufactured in the 1950's. Since then, his marketing is being enlarged, with units operating in Trinidad & Tobago, Colombia, Bolivia and the Brazilian states of São Paulo and Santa Catarina.

Source: cpampa.com

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