A kind of pumpable ductile concrete and its application in bridge deck continuous slab structure

Abstract

The invention provides a pumpable ductile concrete and its application in the bridge deck continuous slab structure, which belongs to the field of inorganic non-metallic technology. The invention is a pumpable ductile concrete, which comprises the following components in parts by weight: cement 40.2‑57.6 parts, ceramic powder 4.0‑5.8 parts, inorganic nanomaterials 0.6‑1.2 parts, composite fiber 12.3‑20.5 parts, water reducing agent 0.5‑0.9 parts, inorganic salt 0.4‑0.6 parts, silica fume 2.6‑3.4 parts, powder Coal ash 13.4-28.8 parts, gravel 56.0-72.5 parts, medium sand 70.0-87.0 parts. The concrete of the present invention has high toughness, good fluidity during pouring construction, strong temperature change resistance, and can withstand bending, stretching, and torsion deformation caused by factors such as bridge temperature stress, vehicle horizontal braking load, and bridge bending deformation. Long-term use will not cause damage.

Description

Technical field[0001]The present invention belongs to the field of inorganic non-metallic techniques, and more particularly to a pumping toughness concrete and its application in a bridge surface continuous panel structure.Background technique[0002]At present, in the construction of the city's rapid municipal road viaduct, it is generally used in the form of simple beams. There is a gap between adjacent simplified beams on the same bridge pier cover to ensure that the bending moment is not transferred between different across adjacent intersection beams. The bridge paving layer is continuous at the bridge gap, and there is a need for a bridge-side continuous structure to support the paving layer load and driving load at the bridge gap, and the bridge surface continuous structure between the bridges between the bridge is in the service process. It must be able to withstand large deformation due to load and temperature difference. At present, the bridge surface continuous structure be...

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Problems solved by technology

Expansion joint devices (such as open CN1570281, CN1696406) are generally comb-shaped steel structure devices, which can bear large deformation along the bridge direction, but can not bear the torsional deformation of the bridge deck, and the construction is complicated; ductile bridge deck filling materials (public number CN101418126) are generally It is asphalt material or rubber concrete, which is convenient for construction and can withstand various forms of large deformation, but because it is an organic material, it is easy to age and has poor durability; the bridge deck continuous slab (public number CN103510465) is a concrete structure, which is poured and constructed integrally with the bridge deck , through the configuration of steel bars, steel and steel fibers to control the development of cracks, but because concrete itself is a quasi-brittle material, cracks will still develop and accumulate under fatigue loads, which will affect the service life of the bridge deck continuous slab

In the prior art, concrete pouring is also used to form a bridge deck continuous slab, and concrete is poured on the upper part of two adjacent simply supported beams during construction, but there are often many problems in the process of using concrete: the toughness of concrete is low, It cannot withstand vibrations with large amplitudes, especially when vehicles of different weights on the bridge are continuously rolled, they will break, and cracks will appear on the road surface after long-term use, requiring frequent repairs and wasting human and financial resources; in addition, the fluidity of concrete is poor. It brings a lot of inconvenience during the construction process, and it is easy to have a dense filling part during pouring, which reduces the strength of the continuous slab structure of the bridge deck; the frost resistance is poor, and the concrete will have frost heave at a lower temperature. Wind and rain, long-term use is prone to cracks

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