A negative expansion modified asphalt joint filling material
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A negative expansion material and modified asphalt technology, applied in the field of pavement material engineering, can solve the problems of low economic benefit, mechanical damage, large construction area of stress absorption zone, etc.
Active Publication Date: 2017-08-25
SHANXI PROVINCIAL RES INST OF COMM +1
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Problems solved by technology
In order to maintain the durability and driving comfort of cement concrete pavement, joint filling materials are usually used for joint filling treatment, and even asphalt layers are added. These treatment measures cannot effectively alleviate the crack reflection problem of old cement concrete
The reason is that the thermal expansion and contraction of cement concrete is more obvious, and the joint filling material is also a thermal expansion and contraction material. During the cooling process, it is easy to form cracks between the two due to insufficient cohesive force and then separate from each other. Rainwater seeps into the roadbed along the cracks, causing the overall bearing capacity of the road to decrease
In order to solve such problems, some scholars proposed epoxy resin joint technology, stress-absorbing tape technology, and high-permeability emulsified asphalt technology, which also brought new technical problems: epoxy resin has strong bonding performance and difficult construction. Severe mechanical damage; large construction area of stress absorption zone, low economic benefits; high-permeability emulsified asphalt has great environmental pollution and poor application performance
Method used
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Embodiment 1
[0036] Taking the preparation of negative expansion modified asphalt joint filling material 100Kg as an example, the mass ratio of raw materials used is as follows:
[0043] First, weigh 2Kg of polyoxypropylene-polyoxyethylene copolymer, 7Kg of zinc cyanide, and 4Kg of sodium zirconium phosphate, add 5Kg of alcohol to submerge the solids, heat the mixture and keep it at a temperature of 60°C, and stir for 15 minutes in a small cement mixing pot , after the alcohol is completely volatilized, grind it through a small cement mill for 10 minutes, and store the ground powder for later use;
[0044] Heat 55Kg of SBS modified asphalt to a molten state, then add the ground powder, and use a high-speed shearer to shear at a speed of 2000 rpm for 13 min...
Embodiment 2
[0047] Taking the preparation of negative expansion modified asphalt joint filling material 100Kg as an example, the mass ratio of raw materials used is as follows:
[0048] SBS modified asphalt 55Kg
[0049] Zinc cyanide 7Kg
[0050] Sodium zirconium phosphate 4Kg
[0051] Calcium powder 32Kg
[0052] Sodium polyacrylate 2Kg.
Embodiment 3
[0054] Taking the preparation of negative expansion modified asphalt joint filling material 100Kg as an example, the mass ratio of raw materials used is as follows:
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Abstract
The invention belongs to the technical field of pavement material engineering, and specifically discloses a negative expansion modified asphalt joint filling material and an application method thereof. The modified asphalt joint filling material of the present invention comprises: 40-62% of base asphalt, 4-10% of negative expansion material, 3-5% of expansion coordinating agent, 30-42% of filler and 1-3% of auxiliary agent, in terms of mass percentage, Total 100%. Among them, the base asphalt is SBS modified asphalt, the negative expansion material is zinc cyanide and cadmium cyanide, the expansion coordinator is sodium zirconium phosphate, the filler is calcium powder, and the additive is sodium polyacrylate or polyoxypropylene polyoxyethylene copolymer . The joint filling material of the invention can effectively control the problem of crack expansion caused by material thermal expansion and cold contraction, effectively fill the cracks in the old cement concrete pavement, play a waterproof role, and can also improve driving comfort. The joint filling material of the invention will be popularized and applied in functional maintenance of old cement concrete pavement and crack filling projects of buildings.
Description
technical field [0001] The invention relates to the technical field of pavement material engineering, in particular to a negative expansion modified asphalt joint filling material and an application method thereof. Background technique [0002] Cement concrete pavement has the advantages of strong bearing capacity and long service life, and has been widely used. At this stage, the prices of cement and steel bars in the country continue to drop, but it is difficult to expand the scope of application of cement concrete pavement, which has attracted the attention of many scholars. Cement concrete pavement is one of the most common pavements, and the biggest problem it faces is the occurrence of initial cracks and the expansion of cracks in the later stage. In order to maintain the durability and driving comfort of cement concrete pavement, joint filling materials are usually used for joint filling treatment, and even asphalt layers are added. These treatment measures cannot ef...
Claims
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Application Information
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