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Cement concrete for wet joints of simply supported and then continuous bridges and preparation method thereof

A simple support and then continuous, cement concrete technology, applied in the field of bridge cement concrete materials, cement concrete and its preparation, to achieve high toughness, improve impermeability, and achieve the effect of self-leveling

Active Publication Date: 2019-01-08
CHANGAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The concrete is a crack-resistant concrete with low modulus and high flexibility, which can meet the requirements of wet joints on the bearing capacity of cement concrete and the requirements of impact resistance and impermeability, solve the problem of bridge deck cracks, improve the mission life of bridges, reduce Later maintenance costs

Method used

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  • Cement concrete for wet joints of simply supported and then continuous bridges and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0045] Example 1: Cement Concrete for Wet Joints of Simply Supported Bridges Then Continuous

[0046] The cement concrete used for the wet joints of simply supported and then continuous bridges provided in this example is composed of the following raw materials in terms of weight percentage: 35% cement; 27% river sand; 16% water; 1% water reducing agent; Rice husk ash 7%; apatite 5%; sericite 0.8%; sepiolite 2.2%; sodium polyacrylate superabsorbent resin 0.8%; talcum powder 2%; nano calcium carbonate 2%; hybrid fiber 1.2%. The sum of the weight percentages of raw materials is 100%.

[0047] Wherein the weight ratio of polyethylene fiber and polyester fiber in the hybrid fiber is 65:35.

[0048] The above-mentioned preparation method of the cement concrete used for the wet joints of simply supported bridges followed by continuous bridges is carried out according to the following steps:

[0049] Step 1. Take the above-mentioned raw materials respectively according to the mass ...

Embodiment 2

[0054] Example 2: Cement Concrete for Wet Joints of Simply Supported Bridges Then Continuous

[0055] The difference between this embodiment and the above-mentioned embodiment 1 lies in the ratio of each raw material. The cement concrete is composed of the following raw materials in terms of weight percentage: 25% cement; 25% river sand; 19% water; 1% water reducer; 10% rice husk ash; 6% apatite; %; sepiolite 3.2%; sodium polyacrylate superabsorbent resin 0.5%; talcum powder 3%; nano calcium carbonate 4%; hybrid fiber 2%. The sum of the weight percentages of raw materials is 100%.

[0056] Wherein the weight ratio of polyethylene fiber and polyester fiber in the hybrid fiber is 60:40.

Embodiment 3

[0057] Example 3: Cement Concrete for Wet Joints of Simply Supported Bridges Then Continuous

[0058] The difference between this embodiment and the above-mentioned embodiment 1 lies in the ratio of each raw material. The cement concrete is composed of the following raw materials in terms of weight percentage: 40% cement; 25% river sand; 17% water; 0.8% water reducer; 5% rice husk ash; 4% apatite; %; sepiolite 1.8%; sodium polyacrylate superabsorbent resin 1.5%; talcum powder 2.5%; nano calcium carbonate 1%; hybrid fiber 0.8%. The sum of the weight percentages of raw materials is 100%.

[0059] Wherein the weight ratio of polyethylene fiber and polyester fiber in the hybrid fiber is 70:30.

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Abstract

The present invention discloses a cement concrete for the wet connection seam of a system sequentially comprising simply-supported bridge and continuous bridge, and a preparation method thereof, wherein the cement concrete comprises cement, river sand, water, a polycarboxylic acid-based efficient water reducer, rice hull ash, apatite, sericite, sepiolite, a sodium polyacrylate high water absorption resin, talc powder, nanometer calcium carbonate, polyethylene fibers and polyester fibers, and with the synergistic effect among the mineral components such as the apatite, the sericite and the sepiolite and the two fibers, the toughening can be achieved, the impact resistance and the extension ability of the concrete can be improved, and the problems that the wet connection seam concrete is damaged and the bridge surface cracks can be effectively solved. According to the present invention, the cement concrete has advantages of high compressive strength, good toughness, impact resistance, permeation resistance, self-leveling, and the like.

Description

technical field [0001] The invention belongs to the field of building materials and relates to bridge cement concrete materials, in particular to cement concrete used for wet joints of simply supported and then continuous bridges and a preparation method thereof. Background technique [0002] With the proposal of the "Belt and Road" strategy and the continuous development of high-grade highway bridge construction, higher requirements have been put forward for the structural quality and service performance of highway bridges, and many outstanding problems have been exposed during the construction process, especially for bridges. construction. [0003] In the development and construction of bridges, simply supported beam bridges are the earliest and most widely used bridge type among beam bridges. This type of bridge has the advantages of simple structure, convenient construction, and can adapt to large settlement of the foundation. But the biggest problem is that there are ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/00C04B111/50
CPCC04B28/00C04B2111/503C04B2201/50C04B14/068C04B14/36C04B14/366C04B14/20C04B14/042C04B24/26C04B14/28C04B16/0625C04B16/0683C04B2103/302
Inventor 何锐郑睢宁黄鑫邵玉仵江涛
Owner CHANGAN UNIV
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