橋梁設(shè)計外文翻譯資料--超輕大跨度橋-橋梁設(shè)計(文件)
【正文】 Sundoya, was also the contractor on the Raftsundet Bridge, and architect Boarch Arkitekter has also worked on the two schemes. In January 2020 the joint venture pany AF Sundoybrua won the contract from client Statens Vegvesen to build the Sundoya Bridge. This joint venture consisted of the contractors Reinertsen Anlegg and NCC Construction. High performance concrete is central to the design of the bridge ?both normal weight HPC and lightweight HPC. Normal weight concrete, at approximately 2500kg/m3, is used for the 120m side spans, while lightweight concrete, which weighs in at about 1970kg/m3, is used for construction of the 298m main span. This enables construction to proceed using the balanced cantilever method. Local rock from Norway is used as the aggregate for the normal weight concrete, but the lightweight concrete required an imported solution. Normally the aggregate used for lightweight concrete in Europe is expanded clay or shale, but this material has high levels of absorption and for this reason, regulations prevent such concrete from being pumped. ****大學(xué)畢業(yè)設(shè)計（論文） 2 In order to address this, the contractor adopted a similar solution to that used on Raftsundet Bridge ?importing Stalite aggregate from South Carolina in the USA. Stalite is produced through thermal expansion of high quality slate, and results in a lightweight aggregate that gives concrete of very high strength at low unit weights. Its low absorption of approximately 6% and high particle strength are two of the factors that allow Stalite to achieve high strength concrete in excess of , the manufacturer says. The bondand patibility of the aggregate with cement paste reduce microcracking and enhance durability, and its low absorption makes it easy to mix and pump. According to AF Sundoybrua quality manager JanEirik Nilsskog, this material has given a very good result. It produces concrete that is easy to pour into the formwork and it gives a good surface finish, he says. It is being pumped some 120m along the bridge deck to the concreting position. C
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