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Castable material used for rapidly restoring city bridge expansion joint concrete and preparation method thereof

A technology of concrete and expansion joints, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve unsatisfactory problems, achieve improved compactness, high flexural and flexural strength, and good long-term strength Effect

Inactive Publication Date: 2018-01-26
WUHAN HANYANG MUNICIPAL CONSTR GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

None of the traditional restorative materials mentioned above can meet these requirements

Method used

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  • Castable material used for rapidly restoring city bridge expansion joint concrete and preparation method thereof
  • Castable material used for rapidly restoring city bridge expansion joint concrete and preparation method thereof
  • Castable material used for rapidly restoring city bridge expansion joint concrete and preparation method thereof

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Experimental program
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Effect test

preparation example Construction

[0042] The above-mentioned preparation method for the pouring material used for rapid repair of urban bridge expansion joint concrete comprises the following steps:

[0043] Prepare raw materials according to the following raw materials and content ratio:

[0044]

[0045]Dry mix the micro-steel fiber, coarse aggregate and fine aggregate for 1.5-2 minutes, then add cement, silica fume and black iron powder and stir for 1.5-2 minutes, then add water, water reducing agent, expansion agent and polymer emulsion, and wet mix 2 to 4 minutes until the concrete mixture has good fluidity;

[0046] The concrete mixture is molded, vibrated to shape, polished and plastered, and cured for 8-10 hours in an environment with a humidity of more than 90% and 20°C.

Embodiment 1

[0049] Embodiment 1 provides a kind of pouring material that is used for urban bridge expansion joint concrete rapid repair, and the raw material in every cubic meter of pouring material, content ratio are as follows:

[0050]

[0051] The length of the micro-steel fiber is 5-20mm, the diameter is 0.2-0.5mm, and the tensile strength is not less than 400MPa.

[0052] The particle size of the coarse aggregate is 5-16mm, the needle flake content ≤ 8%, the crushing value ≤ 18%, the mud content ≤ 1%, and other indicators meet the requirements for aggregates in JGJ52-2006.

[0053] The fine aggregate is medium-coarse sand, the mud content is ≤2%, the fineness modulus is ≥2.5, and other indicators meet the requirements for aggregates in JGJ52-2006.

[0054] The cement adopts early-strength sulphoaluminate cement, and the setting time is 30-60 minutes.

[0055] Silica fume SiO 2 Content ≥ 90%, moisture content ≤ 3%, density 2.2g / cm 3 , the specific surface area is 15000~25000m ...

Embodiment 2

[0065] Embodiment 2 provides a kind of pouring material that is used for urban bridge expansion joint concrete rapid repair, and the raw material in every cubic meter of pouring material, content ratio are as follows:

[0066]

[0067] The length of the micro-steel fiber is 5-20mm, the diameter is 0.2-0.5mm, and the tensile strength is not less than 400MPa.

[0068] The particle size of the coarse aggregate is 5-16mm, the needle flake content ≤ 8%, the crushing value ≤ 18%, the mud content ≤ 1%, and other indicators meet the requirements for aggregates in JGJ52-2006.

[0069] The fine aggregate is medium-coarse sand, the mud content is ≤2%, the fineness modulus is ≥2.5, and other indicators meet the requirements for aggregates in JGJ52-2006.

[0070] The cement adopts early-strength aluminate cement, and the setting time is 30-60 minutes.

[0071] Silica fume SiO 2 Content ≥ 90%, moisture content ≤ 3%, density 2.2g / cm 3 , the specific surface area is 15000~25000m 2 / kg....

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Abstract

The invention discloses a castable material used for rapidly restoring city bridge expansion joint concrete and a preparation method thereof, which relates to the field of a novel pavement material. Each cubic meter of the castable material comprises the following raw materials by content ratio: micro steel fiber accounting for 5-15% of mass of cement, 900-1150 kg of a coarse aggregate, 550-800 kgof a fine aggregate, 450-500 kg of cement, micro silicon powder accounting for 6-12% of mass of the cement, iron black powder accounting for 4-8% of mass of the cement, 100-160 kg of water, a water reducer accounting for 1.0-1.6% of mass of the cement, an expanding agent accounting for 5-10% of mass of the cement, and a polymer emulsion accounting for 6-15% of mass of the cement. The castable material can satisfy the requirements of rapid opening to traffic, high early strength, good endurance, good cohesive property with the original concrete, and small aberration with the bridge asphalt concrete.

Description

technical field [0001] The invention relates to the field of new pavement materials, in particular to a pouring material for quick repair of urban bridge expansion joint concrete and a preparation method thereof. Background technique [0002] As an important component of the bridge, the function of the expansion joint is to enable the bridge structure to expand and contract freely under the influence of factors such as temperature changes, concrete shrinkage, creep, and live loads. During the operation of the bridge, on the one hand, due to factors such as shrinkage and creep of concrete, deflection caused by various loads, uneven settlement of the foundation, longitudinal slope of the bridge deck and driving braking force, etc., early failure of the expansion joints, joint deformation and cast-in-place Defects such as partial spalling of the concrete surface are particularly common; on the other hand, with the increase in the service time of the bridge, due to the effects o...

Claims

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Application Information

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IPC IPC(8): C04B28/06C04B14/48C04B18/14C04B14/30
CPCY02W30/91
Inventor 汪林陈琴徐敏汤春桥褚明陈鸣胡颖肖三秀
Owner WUHAN HANYANG MUNICIPAL CONSTR GRP CO LTD
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