Pumpable tough concrete and application thereof in bridge deck continuous slab structure

Abstract

Belonging to the technical field of inorganic non-metals, the invention provides a pumpable tough concrete and application thereof in a bridge deck continuous slab structure. The pumpable tough concrete includes the following components by weight: 40.2-57.6 parts of cement, 4.0-5.8 parts of ceramic powder, 0.6-1.2 parts of an inorganic nanomaterial, 12.3-20.5 parts of composite fiber, 0.5-0.9 partof a water reducer, 0.4-0.6 part of an inorganic salt, 2.6-3.4 parts of silica fume, 13.4-28.8 parts of fly ash, 56.0-72.5 parts of pebbles, and 77.0-87.0 parts of medium sand. The concrete providedby the invention has high toughness, good fluidity during pouring construction and strong temperature variation resistance, and can withstand bending, stretching and torsional deformation caused by bridge temperature stress, vehicle horizontal braking load, bridge bending deformation and other factors, and has no damage after long-term use.

Description

technical field [0001] The invention belongs to the technical field of inorganic non-metal, and in particular relates to a pumpable ductile concrete and its application in the bridge deck continuous plate structure. Background technique [0002] At present, in the construction of viaducts on urban express municipal roads, simply supported beams are generally used. A certain gap is left between adjacent simply supported girders resting on the same pier cap girder to ensure that no bending moment is transmitted between adjacent simply supported girders at different spans. The bridge deck pavement is continuous at the bridge gap, and a continuous bridge deck structure is required to support the pavement load and traffic load at the bridge gap, and the bridge deck continuous structure between simply supported girders is in service. Must be able to withstand large deformations due to load and temperature differences. At present, there are usually three methods for the bridge de...

AI Technical Summary

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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