Modified straw fiber and preparation method thereof, and fiber asphalt mixture and preparation method thereof

A technology of asphalt mixture and modified straw is applied in the fields of modified straw fiber and its preparation, fiber-asphalt mixture and its preparation field, which can solve the problems of uneven dispersion of straw fiber, etc., so as to reduce the probability of occurrence of road diseases and improve road performance. Good, tough and high adhesion properties

Pending Publication Date: 2022-03-15
SHANDONG JIAOTONG UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of this, the present invention provides a modified straw fiber and a preparation method thereof, as well as a fiber asphalt mixture and a preparation method thereof, which effectively solves the problem of uneven dispersion of straw fiber in the asphalt mixture during mixing

Method used

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preparation example Construction

[0028] The invention provides a kind of preparation method of modified straw fiber, comprising the following steps:

[0029] (1) Mechanical crushing treatment: remove the leaves, ears, and nodes of the straw, and then carry out rolling, soaking, drying, and crushing to obtain fibers;

[0030] (2) Alkali solution soaking treatment: the obtained fibers are treated in an alkali solution to obtain alkali-treated fibers;

[0031] (3) Soak the alkali-treated fiber in a mixed solution of n-heptane and asphalt to obtain the modified straw fiber.

[0032] In the step (1) of the present invention, the straw is preferably cotton straw or corn straw;

[0033] The rolling is preferably rolling back and forth by vehicles for 1 to 2 times;

[0034] The soaking is preferably soaking in clean water for 3-5 hours or using a mixture of anion penetrant and clean water with a mass ratio of 1:100 for 5-7 days, and then cleaning with clean water;

[0035] The drying is preferably air-dried until ...

Embodiment 1

[0054] This embodiment provides a modified straw fiber, the preparation method of which is as follows:

[0055] (1) Mechanical crushing treatment: Remove impurities such as leaves and ears from cotton straw, and then roll it. After rolling, soak it in a mixture of anion penetrant and water with a mass ratio of 1:100 for 6 days, rinse it with water, and dry it to the surface. In the dry state, cut it into 8-12mm small pieces, put it into a household high-speed multifunctional grinder at 25000r / min and grind it for 2.5min, feed 60g each time, after the grinding is completed, use a 0.3mm sieve to remove the powder.

[0056] (2) Alkaline solution immersion treatment: 5gNaOH particles are mixed with 100g water to prepare an alkaline solution with a mass fraction of 5%, and 3g of cotton straw fibers processed in step (1) are put into 250ml of prepared 5%NaOH solution , stir evenly, soak for 0.5h, after soaking, rinse with water several times to remove residual lye, and dry.

[0057...

Embodiment 2

[0059] This embodiment provides a modified straw fiber, the preparation method of which is as follows:

[0060] (1) Mechanical crushing treatment: Remove impurities such as leaves, ears, and nodes from corn stalks, then roll them, soak them in water for 4 hours after rolling, drain them, remove their cores and skins, dry them in the air until they are surface-dry, and cut them Cut into small pieces of 8-12mm, put it into a household high-speed multifunctional grinder at 25000r / min and grind for 2.5min, feed 60g each time, after the grinding is completed, use a 0.3mm sieve to sieve the powder.

[0061] (2) Alkaline solution soaking treatment: mix 7g NaOH particles with 100g water to prepare a 7% alkali solution by mass fraction, take 3g of the processed corn stalk fiber in step (1), and put it into 250ml of prepared 7% NaOH solution , stir evenly, soak for 0.5h, after soaking, rinse with water several times to remove residual lye, and dry.

[0062] (3) Pre-soaking n-heptane and ...

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Abstract

The invention belongs to the technical field of road engineering, and discloses a modified straw fiber and a preparation method thereof, and a fiber asphalt mixture and a preparation method thereof.The method comprises the steps that agricultural straw sections are mechanically crushed, the straw sections are physically crushed into fibers, then the fibers are put into an alkaline solution to be soaked, and the fiber asphalt mixture is obtained; the preparation method comprises the following steps: removing hemicelluloses and lignin in straw fibers to loosen fiber bundles so as to adsorb more asphalt, and finally soaking the straw fibers in a mixed solution of n-heptane and asphalt, so that each fiber is coated with asphalt and disguised into an asphalt body which is better dispersed in an asphalt mixture, and the adhesion and toughness of the straw fibers are improved; therefore, the performance of the fiber asphalt mixture is improved, and a new thought is provided for a straw fiber treatment process for roads.

Description

technical field [0001] The invention relates to the technical field of road engineering, and more specifically relates to a modified straw fiber and a preparation method thereof, as well as a fiber asphalt mixture and a preparation method thereof. Background technique [0002] With the proposal and further implementation of the "Rural Revitalization Strategy", rural road construction plays a great role in promoting the development of rural economy. Rural asphalt pavement is prone to various diseases due to low material selection requirements and untimely pavement maintenance. Adding waste crop straw fiber can effectively improve the road performance of asphalt pavement on the basis of low cost. [0003] The types of fibers often added in asphalt mixture include lignin fiber, basalt fiber and straw fiber, among which straw fiber is the first choice because of its advantages of convenient material acquisition, effective improvement of asphalt mortar performance, and regenerati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/36C04B26/26
CPCC04B40/0039C04B26/26C04B2111/0075C04B2201/50C04B18/248C04B22/062C04B24/00C04B24/36C04B2103/402C04B14/02C04B14/28
Inventor 王琨吴琼石磊吴明君时涛刘宏潘立平马梦瑶王鹏迟安宁逄慧
Owner SHANDONG JIAOTONG UNIV
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