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Preparation method and application of straw fiber for asphalt pavement

A technology of straw fiber and asphalt pavement, which is applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problems of harsh mixing conditions, unstable storage, and high construction costs, and achieve performance improvement, Effects of improving performance and increasing oil absorption rate

Pending Publication Date: 2018-11-30
HARBIN INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the widely used and researched modifiers are various polymer modifiers such as SBS, SBR, PE, EVA, etc. However, compared with base asphalt, the price of paving roads with polymer modified asphalt is expensive, and the construction cost is too high ;Secondly, the use of polymer modified asphalt has problems such as unstable storage and harsh construction conditions for mixing materials

Method used

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  • Preparation method and application of straw fiber for asphalt pavement
  • Preparation method and application of straw fiber for asphalt pavement
  • Preparation method and application of straw fiber for asphalt pavement

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Experimental program
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specific Embodiment approach 1

[0023] Specific implementation mode one: the preparation method of straw fiber for green pavement of this embodiment is implemented according to the following steps:

[0024] 1. Separating the husks of corn stalks, washing the separated husks with water, drying to constant weight, and obtaining dried husks;

[0025] 2. Cut the dried stalks into strips, crush them with a hammer mill to obtain corn stalk fibers, and then put the corn stalk fibers into a grinder for grinding to obtain ground corn stalk fibers;

[0026] 3. Immerse the ground corn stalk fibers in a sodium hydroxide solution with a mass concentration of 0.25% to 3%, and stir and react at a constant temperature at a temperature of 50 to 90°C for 15 to 60 minutes. After the reaction is completed, use deionized water to carry out Rinse and dry to constant weight to obtain straw fiber material for asphalt pavement.

specific Embodiment approach 2

[0027] Embodiment 2: The difference between this embodiment and Embodiment 1 is that in Step 1, a husk and stalk separator is used to separate the husks and stalks of corn stalks.

specific Embodiment approach 3

[0028] Embodiment 3: The difference between this embodiment and Embodiment 1 or 2 is that step 2 cuts the dried straw bark into strips with a size of (0.5-1.5 cm)×(2-4 cm).

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Abstract

The invention relates to a preparation method of a fiber material for an asphalt pavement and an application of the fiber material in modified asphalt. The problem that environment pollution is relieved by utilizing waste straw materials is solved. The preparation method comprises the following steps: 1, separating the skin and pulp of a corn straw, and cleaning the straw skin; 2, cutting the dried straw skin into strips, crushing, grinding to obtain the ground corn straw fibers; 3, immersing the ground corn straw fiber into a sodium hydroxide solution with the mass concentration of 0.25%-3%,carrying out constant-temperature stirring reaction at the temperature of 50-90 DEG C for 15-60 minutes, and washing to obtain the straw fiber material for the asphalt pavement. The straw fiber is used as an external admixture into the modified asphalt. The corn straw fiber material is used in asphalt mortar, the fiber distribution is more uniformly dispersed, the straw fiber has good oil absorption performance, and the oil absorption rate reaches more than 25.

Description

technical field [0001] The invention relates to a preparation method of fiber material for asphalt pavement and its application in modified asphalt. Background technique [0002] Modified asphalt refers to the asphalt binder made by adding resin, polymer, finely ground rubber powder, fiber or other materials to improve the performance of asphalt or asphalt mixture. At present, the widely used and researched modifiers are various polymer modifiers such as SBS, SBR, PE, EVA, etc. However, compared with base asphalt, the price of paving roads with polymer modified asphalt is expensive, and the construction cost is too high Secondly, there are problems such as unstable storage of polymer modified asphalt and harsh conditions for mixing and construction of the mixture. Therefore, although polymer modifiers are widely recognized and applied, it is imperative to develop new, more reasonable and advantageous road asphalt modifiers and modified asphalt production technologies. At p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B20/02C04B18/24
CPCC04B20/023C04B20/026C04B18/24Y02W30/91
Inventor 陈梓宁冯德成易军艳陈志国
Owner HARBIN INST OF TECH
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