Ultra-high-performance cement-based bridge deck slab poured with ultra-high-performance cement-based composite materials

Abstract

The invention relates to an ultra-high-performance cement-based bridge deck slab poured with ultra-high-performance cement-based composite materials. The cement-based bridge deck slab meets the conditions that H / B<=0.03, h / B<=0.025, H>=h+15 mm, 1<=L / B<=4, B1, B2 and B4>=30 mm, B3>=40 mm, b / B=0.05-0.15, b<=L1<=b+B1, the reinforcement ratio of the middle section of the bridge deck slab is 1%-10%, the reinforcement ratio of the reinforcing sections on the two sides of the bridge deck slab is 5%-15%, the rib material yield strength is larger than or equal to 400 MPa, and the self weight is smaller than or equal to 240 kg / m<2>. According to the ultra-high-performance cement-based bridge deck slab poured with the ultra-high-performance cement-based composite materials, due to the fact that the cement-based composite materials with the ultra-high strength and high-strength rib materials are adopted, not only is the high bearing capacity achieved, but also the advantages that the self weight is small (only accounts for 20%-40% of that of an ordinary reinforced concrete bridge deck slab), the fatigue resistance, the corrosion resistance and the long life (the theoretical life can be more than 150 years) are achieved, installation is quick, time and labor are saved (the construction amount and the construction period are both reduced by 50%-70% than those of the ordinary reinforced concrete bridge deck slab) are achieved, and the cement-based bridge deck slab can be applied to new projects of small-medium bridges or existing bridge upgrading projects in the fields of roads, railways and the like.

Description

technical field [0001] The invention relates to an ultra-high-performance cement-based bridge deck, more specifically, relates to an ultra-high-performance cement-based bridge deck poured from ultra-high-performance cement-based composite materials. Background technique [0002] Bridge deck, also known as carriageway slab, is generally constructed of reinforced concrete or steel. It is a load-bearing structure that directly bears vehicle wheel pressure loads and environmental loads. It is also the most directly affected component by overload, corrosion, fatigue and other adverse factors. Reinforced concrete bridge deck is currently the main form of bridge deck for small and medium span bridges. Its advantages are simple design and good economy, but its disadvantages are also very significant, such as large thickness (200-280mm), self-weight (500-700kg / m 2 ), resulting in a large amount of substructure including foundation works, and a long construction period; poor fatigue r...

AI Technical Summary

Problems solved by technology

Reinforced concrete bridge deck is currently the main form of bridge deck for small and medium span bridges. Its advantages are simple design and good economy, but its disadvantages are also very significant, such as large thickness (200-280mm), self-weight (500-700kg / m 2 ), resulting in a large amount of substructure including foundation works, and a long construction period; poor fatigue resistance, fatigue cracks are prone to occur under the repeated impact of wheel pressure loads (especially overloaded vehicles), and become external erosive media (such as Chloride ions, sulfates, etc.) infiltration; poor durability, the lack of carbonation resistance, impermeability, and crack resistance of ordinary concrete itself, resulting in cracks, carbonization, and corrosion of steel bars on the bridge deck before reaching the design life Diseases and other diseases, high maintenance costs are required in the later stage, and the maintenance costs of some projects even exceed the construction costs

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