Case study for ditch cover with ultra-high-performance concrete

Abstract

The case study is to explore the ditch cover with ultra-high-performance concrete (UHPC) and mainly focuses on seven different contents of steel fibers (0, 0.5 %, 1 %, 1.5 %, 2 %, 2.5 %, 3 %) as variables. The fabrication of the UHPC ditch cover was performed with 60㎝× 35㎝ ditch cover mold for UHPC casting and added wire mesh for 2 layers. The test parameters of the ditch cover included the spot welded wire mesh with iron or steel, the steel fiber content, the number of openings, and the thickness. The number of openings in the ditch cover model is 8 holes and 12 holes. The case study is to find a UHPC ditch cover that is strong enough to withstand the weight of a heavy vehicle. The purpose of the research is to develop a UHPC ditch cover, and compare the weight, load bearing, and unit price with zinc grid ditch cover, cast iron ditch cover, and FRP ditch cover. The results show that the compressive and flexural strengths of UHPC with 0–3 % steel fiber content can be rapidly increased by 40 % and 260 %, respectively. The study found that the UHPC trench cover is added with 3 % steel fiber, double-layer spot welded steel mesh, with a thickness of 4 cm and 8 openings, its load-bearing strength can exceed 11 tons, and the load capability/price (C/P) value is extremely high.

Keywords

• Ditch cover
• Ultra-high-performance concrete
• Loading
• Steel fiber
• Unit price