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Fiber-reinforced polymer self-compacting concrete for hinged joints of prefabricated hollow-slab bridges

A self-compacting concrete and fiber-reinforced technology, applied in the field of building materials, can solve the problems of unfavorable hinged concrete pouring and vibration, weakening the overall performance of hollow slab beams, and insufficient fatigue resistance, so as to shorten the construction period and improve the overall performance. Work performance and the effect of prolonging the service life

Inactive Publication Date: 2016-05-04
ZHENGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The hinge joint is the post-casting part of the hollow slab girder. The shape of the hinge joint is narrow and deep, which is not conducive to the pouring and vibration of the hinge joint concrete. The concrete is prone to non-compacting and the strength cannot meet the design requirements.
At present, ordinary concrete or high-strength non-shrinkage grouting materials are generally used in bridge hinge joint construction or maintenance and reinforcement projects. Under load, the bond between old and new concrete is seriously weakened, which weakens the overall performance of the hollow slab beam; high-strength non-shrinkage grouting materials have the characteristics of high early strength, no shrinkage, and self-compacting, but high-strength non-shrinkage grouting materials have high strength. High brittleness and insufficient fatigue resistance
Due to the extremely complex force of the hinge joint, under the long-term repeated vehicle load, the fatigue problem is prominent, and fatigue damage is very easy to occur

Method used

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  • Fiber-reinforced polymer self-compacting concrete for hinged joints of prefabricated hollow-slab bridges
  • Fiber-reinforced polymer self-compacting concrete for hinged joints of prefabricated hollow-slab bridges
  • Fiber-reinforced polymer self-compacting concrete for hinged joints of prefabricated hollow-slab bridges

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Fiber-reinforced polymer self-compacting concrete for hollow slab bridge hinge joints in this embodiment is made of the following raw materials in parts by weight: 580 parts of cementitious material, 734 parts of fine aggregate, 898 parts of coarse aggregate, 174 parts of water, and 50 parts of steel fiber parts, 29 parts of polymer emulsion, 5.8 parts of water reducer and 29 parts of expansion agent.

[0020] Among them, the cementitious material is composed of the following raw materials in parts by weight: 290 parts of ordinary portland cement, 58 parts of sulphoaluminate cement, 116 parts of first-grade fly ash and 116 parts of S95 grade slag powder; Sand, fineness modulus 2.5-2.8, sand rate 45%; coarse aggregate is limestone gravel, particle size 5mm~10mm; steel fiber is copper-plated steel fiber, diameter 0.20mm, length 13mm, tensile strength 2200MPa ; The polymer emulsion is styrene-butadiene emulsion; the water reducer is polycarboxylate high-performance water r...

Embodiment 2

[0027] Fiber-reinforced polymer self-compacting concrete for hollow slab bridge hinge joints in this embodiment is made of the following raw materials in parts by weight: 580 parts of cementitious material, 738 parts of fine aggregate, 866 parts of coarse aggregate, 174 parts of water, and 78 parts of steel fiber parts, 29 parts of polymer emulsion, 6.4 parts of water reducer and 29 parts of expansion agent.

[0028] Among them, the cementitious material is composed of the following raw materials in parts by weight: 348 parts of ordinary Portland cement, 116 parts of sulphoaluminate cement, 58 parts of first-grade fly ash and 58 parts of S95 grade slag powder; the fine aggregate is river Sand, fineness modulus 2.5-2.8, sand rate 46%; coarse aggregate is limestone gravel, particle size 5mm~10mm; steel fiber is copper-plated steel fiber, diameter 0.20mm, length 13mm, tensile strength 1600MPa ; The polymer emulsion is ethylene-vinyl acetate copolymer emulsion; the water reducer i...

Embodiment 3

[0034] The fiber-reinforced polymer self-compacting concrete for the hinge joints of hollow slab bridges in this embodiment is made of the following raw materials in parts by weight: 620 parts of cementitious material, 660 parts of fine aggregate, 840 parts of coarse aggregate, 180 parts of water, and 100 parts of steel fiber parts, 62 parts of polymer emulsion, 7.4 parts of water reducer and 31 parts of expansion agent.

[0035] Among them, the cementitious material is composed of the following raw materials in parts by weight: 372 parts of ordinary Portland cement, 93 parts of sulphoaluminate cement, 62 parts of first-grade fly ash and 93 parts of S95 grade slag powder; the fine aggregate is river Sand, fineness modulus 2.5-2.8, sand rate 44%; coarse aggregate is limestone gravel, particle size 5mm~10mm; steel fiber is copper-plated steel fiber, diameter 0.20mm, length 13mm, tensile strength 1800MPa ; The polymer emulsion is an acrylate emulsion; the water reducer is a polyc...

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Abstract

The invention belongs to the field of building materials, and in particular relates to a fiber-reinforced polymer self-compacting concrete used in newly-built or repaired and reinforced hinged joints of assembled hollow slab bridges. The present invention is made of the following raw materials in parts by weight: 520-650 parts of cementitious material, 650-800 parts of fine aggregate, 750-900 parts of coarse aggregate, 170-185 parts of water, 50-100 parts of steel fiber, polymer The amount of emulsion is 5%-10% of the gelling material, the amount of water reducer is 0.8%-1.2% of the gelling material, and the amount of expansion agent is 4%-8% of the gelling material. The invention aims at the problems existing in the hinge joints of assembled hollow slab bridges, and has the advantages of no vibration, convenient construction, high early strength, small shrinkage, high bonding strength and good fatigue resistance, and can effectively improve the performance of assembled hollow slab bridges. The overall performance of the bridge prolongs the service life of the bridge.

Description

Technical field [0001] The present invention is the field of building materials, which involves a fiber enhanced polymer's dense concrete, and especially involves a fiber enhancement of the fiber enhanced polymer for the newly built or repaired and reinforced prefabricated empty board bridge hinge. Background technique [0002] The assembly hollow board bridge is a common bridge type in my country's bridge engineering. The bridge type has been widely used in small and medium -sized span bridges due to its facilitation of pre -production, fast installation, simple construction technology, and low engineering cost. Highway bridges with more than 90%of over 90%below 20m adopt a prefabricated hollow board structure.The hinge seam is an important structural measure to connect the hollow plate into an overall, and the function of the transmission transmission of horizontal loads. The quality of the hinge joint determines the overall work performance of the hollow board.During the opera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/06C04B14/48C04B14/06C04B14/02
Inventor 赵军李光辉
Owner ZHENGZHOU UNIV