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WebThe slab (2) is made from concrete (6) containing synthetic fibers (7), a lower reinforcing layer (3, 4) and a central section with tubular cavities (5) running the whole length of the slab and having a diameter equivalent to half its thickness. The fibers have an average length of 5 - 20 mm and a diameter of 15 - 100 mcm, and are applied at 0. ... WebJan 18, 2024 · Prefabricated box culvert is a new structure in road engineering, whose health is very important to road safety. The use of acoustic emission (AE) as a detection method and the use of other improved algorithms to evaluate the damage of prefabricated box culverts are still insufficient. In this paper, two kinds of prefabricated box culverts are … electric marking pencil
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