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Composite material dowel steel for cement concrete road and its preparing method

A technology of cement concrete and composite materials, applied in roads, roads, pavement details, etc., can solve the problems of high surface hardness of steel dowel bars, corrosion of steel dowel bars, looseness of dowel bars, etc., and achieve corrosion resistance Good, cost saving, high economical effect

Inactive Publication Date: 2009-01-14
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For a long time, due to water leakage at the joints of the road surface, the steel dowel bars have been severely corroded; another problem is that the surface hardness of the steel dowel bars is too high, and the contact interface between the dowel bars and the road concrete is easily damaged under the load of the wheels , causing the dowel bar to loosen and eventually lead to failure of the dowel bar and damage to the pavement

Method used

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  • Composite material dowel steel for cement concrete road and its preparing method
  • Composite material dowel steel for cement concrete road and its preparing method
  • Composite material dowel steel for cement concrete road and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] (1) Weigh various raw materials according to the design mix ratio, the water-cement ratio (water consumption / initially calculated cement consumption) is 0.45, and the sand rate (fine aggregate / (fine aggregate + coarse aggregate)) is 52%; The amount of coal ash is 25% of the initial calculated cement amount, the water reducer is 0.5% of the initial calculated cement amount, the defoamer is 0.1‰ of the initial calculated cement amount, and the final cement amount is the initial calculated cement amount minus fly ash. The amount of cement replaced, the water consumption per unit volume is 210Kg / m 3 , the amount of coarse aggregate is 850Kg / m 3 ; Divide the water into two parts, one part is 80%, mixed with water reducing agent; the other part is 20%, mixed with defoamer, fully mixed evenly;

[0039] (2) Add coarse aggregate, fine aggregate, cement, and fly ash into the cement concrete mixer in sequence, start the mixer motor, and mix the materials evenly. During the mixing...

Embodiment 2

[0045] (1) Weigh various raw materials according to the design mix ratio, the water-cement ratio (water consumption / initially calculated cement consumption) is 0.37, and the sand rate (fine aggregate / (fine aggregate + coarse aggregate)) is 46%; The amount of coal ash is 15% of the initial calculated cement amount, the water reducer is 2% of the initial calculated cement amount, the defoamer is 3‰ of the initial calculated cement amount, and the final cement amount is the initial calculated cement amount minus fly ash. The amount of cement replaced, the water consumption per unit volume is 190Kg / m 3 , the amount of coarse aggregate is 880Kg / m 3 ; Divide the water into two parts, one part is 85%, mixed with water reducing agent; the other part is 15%, mixed with defoamer, fully mixed evenly;

[0046] (2) Add coarse aggregate, fine aggregate, cement, and fly ash into the cement concrete mixer in sequence, start the mixer motor, and mix the materials evenly. During the mixing pro...

Embodiment 3

[0052] (1) Weigh various raw materials according to the design mix ratio, the water-cement ratio (water consumption / initially calculated cement consumption) is 0.3, and the sand rate (fine aggregate / (fine aggregate + coarse aggregate)) is 42%; The amount of coal ash is 10% of the initial calculated cement amount, the water reducer is 3% of the initial calculated cement amount, the defoamer is 5‰ of the initial calculated cement amount, and the final cement amount is the initial calculated cement amount minus fly ash. The amount of cement replaced, the water consumption per unit volume is 180Kg / m 3 , the amount of coarse aggregate is 950Kg / m 3 ; Divide the water into two parts, one part is 90%, mixed with water reducing agent; the other part is 10%, mixed with defoamer, fully mixed evenly;

[0053] (2) Add coarse aggregate, fine aggregate, cement, and fly ash into the cement concrete mixer in sequence, start the mixer motor, and mix the materials evenly. During the mixing proc...

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Abstract

This invention discloses a compound material dowel bar for concrete road paving, which contains bar core and glass fiber reinforced plastics pipe made of wound fiber and resin and covered on bar core, the fiber content is 60-75 % and the resin content is 25-40 %. The section of dowel bar is round or ellipse. Said compound material dowel bar has fine erosion resistance, durability and associativity with concrete, capable of saving 30 % of cost than that of steel dowel bar.

Description

technical field [0001] The invention belongs to the field of road engineering, and in particular relates to a dowel bar of composite material used for cement concrete pavement and a preparation method thereof. Background technique [0002] A large number of cement pavement surveys have found that the main damage forms of the existing cement pavement are broken boards and wrong platforms. These pavement damages seriously affect the driving quality of vehicles on the pavement, and greatly shorten the service life of the pavement, which greatly increases the cost of road construction and maintenance. In view of this, the 2003 edition of the "Code for Design of Highway Cement Concrete Pavement" promulgated by the state further emphasizes the importance of the load transfer device between the joints of cement concrete pavement, and clearly points out that all transverse joints of high-grade highways must be equipped with dowel bars. At the same time, the size requirements for th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): E01C11/14
Inventor 王端宜胡迟春潘艳珠
Owner SOUTH CHINA UNIV OF TECH
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