Preparation and application method of a storable high modulus natural asphalt binder

Abstract

The invention relates to a preparation and application method of a storable high-modulus natural asphalt cementing material. The method comprises the following steps: mixing natural asphalt which is crushed into 300 meshes with soft asphalt which is heated to be 190 to 200 DEG C according to a ratio of 1: 3 to 5:1 at room temperature, enabling an obtained mixture to enter a grinding machine, grinding for 1 to 2h to obtain a natural asphalt mother solution with an average particle size of trichloro ethylene insoluble substances in the natural asphalt less than or equal to 5000 to 10000 meshes; mixing the mother solution and road petroleum asphalt with the temperature of 130 to 150 DEG C according to a weight ratio of 30: 70 to 70:30 to obtain a mixture A, adding a coupling agent accounting for 0.1 to 2 percent of the weight of the mixture A, uniformly stirring, adding a polymer modifier accounting for 0 to 10 percent of the weight of the mixture A, shearing, dispersing, then adding the cross-linking agent, developing for 2 to 5 h at the temperature lower than 180 to 190 DEG C, adding a viscosity reducer, and stirring for half an hour to obtain the storable high-modulus natural asphalt cementing material, wherein the cross-linking agent and the viscosity reducer respectively account for 0 to 0.3 percent and 0.1 to 1 percent of the weight of the mixture A. The high-modulus asphalt mixture cementing material is firstly prepared in a form of a finished product material, the product can be stored and transported for a long time without being separated, and the prepared mixture has excellent characteristics of high-modulus asphalt mixture and excellent low-temperature performance.

Description

technical field [0001] This patent belongs to the field of road building materials and specifically relates to a preparation and application method of a storable asphalt binder specially used for high modulus asphalt mixture. Background technique [0002] High Modulus Asphalt Mixture (HMAC: High Modules Asphalt Concrete for short) originated in France. Due to its high overall modulus and good fatigue resistance, it was introduced and absorbed by Britain, South Africa, the United States, Finland, China and other countries. It is used to solve the problems of road surface rutting under the condition of sudden increase in traffic volume and heavy load. According to the definition of French asphalt mixture design specification (NFP98-140), when the dynamic modulus (15°C, 10Hz) of asphalt mixture is greater than 14000Mpa, it is called "high modulus asphalt mixture". After HMAC was introduced into China, it was mainly used in the middle and lower layers of asphalt pavement. Its a...

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Problems solved by technology

The wet or dry process not only increases the construction process, but also has poor product quality stability and difficult quality control.

[0005] Chinese patents "A High Modulus Asphalt Based on Natural Asphalt Modification and Its Preparation Method and Application" 201410536546.9, "A High Modulus Asphalt and Its Preparation Method" 201410063471.7 both use natural asphalt as a modifier, which belongs to the wet process The use of natural asphalt does not produce a finished cementitious material, and it does not mention whether the product can be stored for a long time.

And the fatigue life of the mixture did not adopt the standard of more than 1 million times required by the French high modulus asphalt mixture

The Chinese patent "An energy-saving and environment-friendly asphalt and its preparation process" also mentions the way of using natural asphalt, various polymers and road petroleum asphalt to configure asphalt, and according to its implementation cases, the high-temperature rutting indicators are all less than 5000 times / mm , cannot be used in HMAC, and does not mention the storage stability of the product

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