The results show that a high performance lightweight concrete utilizing an expanded slate aggregate can be produced and placed under the same general procedures using the same equipment as for normal weight concrete. Quality control documentation from the general production testing, both at the batch plant and at the site, demonstrated that the lightweight concrete used on the Raftsundet Bridge showed equal or less variation in most parameters compared to the normal weight concrete used on the same project [11]. The following table presents a summary of these test results:

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