Wood fiber
Road with lignin fibers, also known as wood cellulose or wood fiber，Is the production of hot-mix asphalt crushed stone horseshoe lipid mixture (SMA) One of the important raw materials，From absorption in which the asphalt binder to enhance bond strength and stability. It is a natural wood chemically treated to be organic fibers, the appearance of cotton wool, white or off-white. Through screening, division, high temperature treatment, bleaching, chemical treatment, neutralization and screening into different degrees of fiber length and thickness to suit different needs. As the treatment temperature up to 260 ℃ and above, under normal conditions is chemically very stable material, not as a general solvent, acid and alkali corrosion, with non-toxic, tasteless, non-polluting, non-radioactive good quality, does not affect the environment, harmful to humans, is a green product, which is other minerals prime fibers do not possess. Micro-fiber ribbon structure is curved, uneven, porous, cross is that flat, with good toughness, dispersion and chemical stability, water absorption ability, has a very good anti-cracking performance thickening。
1:Road, the main properties of fibers with lignin
(1) Reinforced the role of
In the SMA mixture blending fiber, fiber mixture of the dispersed phase in a three-dimensional existence, such as a variety of steel fiber reinforced concrete, geogrid, geotextile reinforcement materials such as reinforcement can play a role in。
(2) Dispersion
If there is no fiber, a considerable amount of asphalt slag is likely to be micelles can not be evenly spread between the aggregate, paving the road will be clearly visible to the "oil spot" exists, fiber can make micellar dispersion。
(3) The role of adsorption and absorption of asphalt
In the SMA mixture by adding fiber's role is to fully adsorption (surface) and absorption (internal) asphalt, so that increased use of asphalt, bitumen film thickening, improve mixture durability.
(4)Stabilizing
Fiber to asphalt membrane at a relatively stable state, especially in the hot summer season, when the thermal expansion of asphalt, fiber internal voids in the room will also serve as a buffer will not become a free asphalt and Fan You, on the temperature stability is also good。
(5) Thickening effect
Fibers will increase the adhesion of asphalt and mineral aggregate nature of the bond through the film to enhance the bond strength between aggregates。
- Lignin fiber performance parameters
|
Model
|
FB-200
|
FB-500
|
FH-500
|
FB-900
|
FH-1000
|
|
Fiber
|
95%
|
95%
|
95%
|
95%
|
95%
|
|
PH
|
6.5
|
7.0
|
7.0
|
7.0
|
7.0
|
|
Density
|
25-30g/L
|
25-30g/L
|
45-52g/L
|
25-30g/L
|
20-25g/L
|
|
The average length of
|
200um
|
500um
|
500um
|
850-900um
|
1000um
|
|
Absorption
|
4.5
|
4.8
|
4.5
|
5.0
|
6.0
|
|
Color
|
White
|
White
|
Gray
|
Gray
|
Gray
|
|
Dispersion
|
99.5%
|
97%
|
97%
|
95%
|
92%
|
- Lignin fiber in the role of SMA pavement
Lignin in the fiber is the preferred SMA fiber stabilizer, is characterized by a high specific surface area, with a better combination of nature, in the SMA pavement crack can play the role of the SMA mixture between fiber and fiber three-dimensional structure of Da Cheng could play an enhanced role in the process of freezing or drying machinery can be fiber reinforced weakened, effectively reduce the surface low-temperature cracking; lignin fiber has good dispersion, by adding an appropriate amount of fiber which will take micelle dispersion, to prevent road oil spot; lignin fibers have good adsorption of the liquid mandatory force, lignin fibers can absorb 1-2 times its own mass of liquid, and with its structure, fluid absorption 2-6 times, (the quality of oil absorption rate of up to five times more than their own) . In the SMA mixture can increase the asphalt material, asphalt film thickening; tackifier used in the SMA mixture, fiber to increase the bond between the asphalt and slag force, thereby increasing the friction between the road and the tire ; lignin fiber has excellent stabilizing effect can pitch in a relatively stable state, especially during the hot summer, fiber gap within the cushion will not become a free pitch at a high temperature while the Fan You 。
- Applications
Pavement lignin fibers for its excellent quality assurance in production, transportation, paving, and the process of mixing crushed material uniformity and stability. The level of the asphalt pavement and improved durability played a significant role. For the construction of high-quality asphalt pavement laid the cornerstone. Pavement lignin fibers have been widely used in the construction of new and SMA asphalt, fiber reinforced asphalt pavement, concrete pavement plus cover, permeable asphalt mixture. As an extremely robust and high durability of the road for a variety of special traffic situations and weather conditions have excellent adaptability. Therefore, the traffic situation SMA specially designed for the following:-F1 Formula One racing track - fast highways and city roads, trunk roads in anti-slide surface - high and cold areas to prevent temperature and shrinkage crack - the airport runway, overpass, ramp - heavy traffic sections of highways, heavy and overloading of vehicles contained in the section - high rainfall areas the road, car park - the bridge pavement, especially the steel bridge deck pavement - urban road bus lanes - urban road intersections, bus stations, car parks, freight yard , port terminals - in urban areas need to reduce road noise, such as schools, hospitals, residential areas and so on, currently in 65 countries and regions around the world to be applied, including the continents of the highway, airport runway, and to the best experience of products the performance of Formula One track. In China, we have "new ideas" Lu has been with the lignin fiber in some provinces and cities as well as international airport expressway was applied 。
- "New ideas" road with the new characteristics of lignin and fiber
- Anti-sliding wear, anti-fatigue, anti-high-temperature rutting. ☆ continuous paving, the pavement is high, a good seam. ☆ applicable to a variety of compulsory mixing machine. ☆ has good drainage. ☆ reduce noise, in line with environmental requirements. ☆ prices are lower than similar products。
- Performance
|
Test items
|
Results
|
Technical Requirements
|
|
Fiber length（mm）
|
all＜6
|
＜6
|
|
Ash（%）
|
19.8
|
18±5,Non-volatile matter
|
|
PH
|
7.5
|
7.5±1.0
|
|
Oil Rate（%）
|
5.6
|
Of not less than 5 times the fiber content
|
|
Moisture（%）
|
3.5
|
＜5
|
|
Voltage capability（℃）
|
260
|
210
|
- Use
Fine packaging "new ideas" road use wood fiber measurement accuracy, easy to use, use is not required to open the package, can be directly invested in the mixing tank, the polyethylene wrapped in mixing the dissolved itself. Mixing time of 3-5 seconds / kg, for a variety of compulsory mixing machine. Add a volume of only 0.3% of asphalt and concrete mixing amount of asphalt material in accordance with the type of testing to determine the same. According to mixing, construction technology requirements, the maximum mixing temperature of up to 200 ℃, paving the temperature up to 180 ℃。
■ Notes
New ideas and lignin fibers can withstand 250 ℃ above ambient temperature is not degenerate, and does not cause pollution to the environment, without risk to health.
* Lignin fibers in the construction process should ensure that fibers do not damp agglomeration and confirmed fibers in the process of mixing asphalt mixture evenly dispersed.
* Lignin fibers should be kept indoors or covered shed where, in the transport and use process should be to prevent the moisture, forming groups, have been damp, knot groups can not be dispersed when mixing fiber, shall not be used。
