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AboutHoude Group is a high-tech enterprise specializing in engineering building materials. It actively promotes the research, development, and production of new materials, new processes, and new technologies. It is a well-known Chinese engineering building materials Brand company with independent intellectual property rights and core innovative products.
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CaseHoude Group has been deeply cultivating overseas markets, successively establishing companies in Dubai, Hong Kong, Malaysia, Pakistan and other regions. It has good project cooperation in dozens of countries worldwide, with projects spanning Asia, Africa, and Europe. Its business scope includes various engineering fields such as highways, railways, airports, bridges, ports, and hydropower stations.
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ProductsHoude Group holds independent intellectual property rights and multiple iOS certifications. It independently researches and produces several series of high-grade, high-quality engineering and construction materials, including Houde Brand cement concrete admixtures, asphalt concrete admixtures, engineering fibers, and geosynthetic composite materials. These high-quality products have been consistently well-received by numerous construction supervision units.
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Industrial BaseThe company integrates industrial bases such as concrete admixtures and civil composite materials, relying on internationally leading research and development technology and intelligent production processes, to build an industrial system covering the entire chain of research and development, production, and sales. Driven by technology, we continuously provide green and reliable comprehensive solutions for global infrastructure construction, and strive to become a leading enterprise in the fields of engineering materials and intelligent equipment.
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Open CollaborationWe actively open and share our resources and platforms, welcoming companies and individuals to actively contact us for agency and cooperation on products, markets, technology, and resources.
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TalentHuman capital is the most precious asset of Houde. We have always attached great importance to employee development, allowing employees' abilities to develop more focused and clearly. A free and inclusive cultural atmosphere allows you to develop freely; your voice will be heard. Here, you will encounter not just colleagues, but also partners who grow side-by-side.
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AboutHoude Group is a high-tech enterprise specializing in engineering building materials. It actively promotes the research, development, and production of new materials, new processes, and new technologies. It is a well-known Chinese engineering building materials Brand company with independent intellectual property rights and core innovative products.
-
CaseHoude Group has been deeply cultivating overseas markets, successively establishing companies in Dubai, Hong Kong, Malaysia, Pakistan and other regions. It has good project cooperation in dozens of countries worldwide, with projects spanning Asia, Africa, and Europe. Its business scope includes various engineering fields such as highways, railways, airports, bridges, ports, and hydropower stations.
-
ProductsHoude Group holds independent intellectual property rights and multiple iOS certifications. It independently researches and produces several series of high-grade, high-quality engineering and construction materials, including Houde Brand cement concrete admixtures, asphalt concrete admixtures, engineering fibers, and geosynthetic composite materials. These high-quality products have been consistently well-received by numerous construction supervision units.
-
Industrial BaseThe company integrates industrial bases such as concrete admixtures and civil composite materials, relying on internationally leading research and development technology and intelligent production processes, to build an industrial system covering the entire chain of research and development, production, and sales. Driven by technology, we continuously provide green and reliable comprehensive solutions for global infrastructure construction, and strive to become a leading enterprise in the fields of engineering materials and intelligent equipment.
-
Open CollaborationWe actively open and share our resources and platforms, welcoming companies and individuals to actively contact us for agency and cooperation on products, markets, technology, and resources.
-
TalentHuman capital is the most precious asset of Houde. We have always attached great importance to employee development, allowing employees' abilities to develop more focused and clearly. A free and inclusive cultural atmosphere allows you to develop freely; your voice will be heard. Here, you will encounter not just colleagues, but also partners who grow side-by-side.
Polyacrylonitrile road reinforcement fiber
I. Product Introduction
Polyacrylonitrile fiber, also known as acrylic fiber or nitrile fiber, is a synthetic fiber made from 100% polyacrylonitrile resin through a special process. After being added to asphalt concrete, it can significantly improve the various properties of asphalt concrete pavements. Its significant role and application prospects in asphalt concrete have been increasingly recognized and accepted by the engineering community.
HD-B polyacrylonitrile road reinforcement fiber is jointly developed and independently produced by our company and a well-known domestic scientific research unit. It is a new type of reinforcing fiber specifically used in asphalt concrete to enhance and prevent cracking, highly suitable for the current status of Chinese highways. As a reinforcing industrial fiber product to enhance the performance of asphalt concrete, HD-B polyacrylonitrile road reinforcement fiber not only significantly improves the bonding, high-temperature stability, and fatigue durability of asphalt pavements but also has the properties of low-temperature crack prevention and prevention of reflective cracking. It can effectively improve tensile, shear, compressive, and impact strength, significantly improving various properties of asphalt concrete pavements.
Filament (before shearing) Short fiber (after shearing)
Polyacrylonitrile Fiber (Second Generation)
II. Product Characteristics
1. Significantly improves the low-temperature crack resistance of asphalt concrete;
2. Effectively reduces the occurrence of reflective cracks and cracks in asphalt pavements;
3. Significantly improves the flexibility of asphalt concrete, enhancing its fatigue resistance;
4. Significantly enhances the rutting resistance of asphalt pavements;
5. Improves the high-temperature stability of asphalt concrete;
6. Improves the water stability of asphalt concrete;
7. Improves the tensile, shear, and stripping resistance of asphalt concrete.
III. Technical Parameters
Fiber type: Bundled monofilament Color: Light yellow
Equivalent diameter: 13±3μm Density: 1.18g/cm3
Length: 6 (±1) mm Melting point: ≥220℃
Tensile strength: ≥800MPa Elastic modulus: ≥16GPa
Elongation at break: 10%~25% Moisture content: ≤2%
Acid and alkali resistance: Strong Light resistance: Good (the best light resistance except for fluorine-containing fibers)
Hydrolysis resistance: Good Heat resistance: Carbon fiber raw silk, can remain unmelted at 240℃ for a short time
IV. Main Functions and Principles
(1) Improving the high-temperature stability of asphalt concrete
The distribution of HD-B polyacrylonitrile road reinforcement fiber in asphalt concrete is three-dimensional and random, and the cross-section is thin and numerous. It forms a crisscross spatial network in asphalt concrete, increasing the proportion of structural asphalt and reducing free asphalt, increasing the viscosity of the asphalt mastic and raising the softening point, thereby improving the high-temperature stability of asphalt concrete. In the hot season, the gaps inside the fibers also act as a buffer, preventing the bleeding of free asphalt and also helping to improve the high-temperature stability of asphalt concrete.
(2) Improving the low-temperature crack resistance of asphalt concrete
After adding HD-B polyacrylonitrile road reinforcement fiber to asphalt concrete, there are a large number of crisscrossing fiber monofilaments in the mixture, which improves its elasticity and gives the asphalt concrete good deformation resistance. It maintains flexibility and high tensile strength at low temperatures, effectively resisting shrinkage stress, reducing shrinkage cracks, and thus improving the low-temperature crack resistance of asphalt concrete.
(3) Improving the bonding strength of asphalt concrete
HD-B polyacrylonitrile road reinforcement fiber in asphalt concrete will improve the bonding strength of asphalt mineral powder mastic, increase the adhesion between asphalt and aggregates, and improve the bonding strength between asphalt aggregates through the viscosity between oil films, ensuring the integrity of the asphalt pavement.
(4) Preventing cracking of asphalt concrete and improving its rutting resistance
HD-B polyacrylonitrile road reinforcement fiber forms a crisscross spatial network in asphalt concrete. The crisscross fiber interlock effect has a retarding effect on the cracking of asphalt concrete, greatly improving its self-healing ability, delaying its aging and damage, enhancing its elastic recovery ability, and improving its rutting resistance.
(5) Improving the fatigue resistance of asphalt concrete
The distribution of HD-B polyacrylonitrile road reinforcement fiber in asphalt concrete is three-dimensional and random, and the cross-section is thin and numerous. It prevents the generation of cracks and prolongs the time for the appearance of asphalt concrete fractures, thus significantly improving the fatigue resistance of asphalt concrete.
V. Product Advantages
◆ Good dispersibility
The polar nitrile group (-CN) contained in the polyacrylonitrile molecule gives the fiber good hydrophilicity, so under normal mixing time, HD-B polyacrylonitrile road reinforcement fiber can be dispersed very uniformly in asphalt concrete.
◆ Strong grip
HD-B polyacrylonitrile road reinforcement fiber has a cashew-shaped cross-section, which, compared to a circular cross-section, has a larger contact area with the asphalt mixture. The surface has been specially roughened, so that the HD-B polyacrylonitrile road reinforcement fiber has a good grip with the asphalt mixture.
◆ Numerous Fibers
There are 1.1 billion 6mm long HD-B polyacrylonitrile road reinforcement fibers per kilogram.
◆ Good Light Resistance and Durability
Its light resistance is the best among all natural and synthetic fibers except fluorinated fibers, ensuring the long-term effectiveness of the product.
VI. Applications
Mainly used in high-grade asphalt pavement projects such as expressways, municipal roads, airport pavements, bridge deck paving, and toll stations.
Specific application areas generally include:
1. New asphalt concrete pavement surface course;
2. Overlay of old asphalt concrete pavement (black + black);
3. Overlay of new and old cement concrete pavement (white + black);
4. Repair, cold patching, and grouting of pavement defects;
5. Asphalt pavement layer of steel structure bridges;
6. Airport runways, bridge deck waterproof layer.
VII. Instructions for Use
A. Recommended Dosage Design
1) For high-grade highways:
2) For bridge deck paving:
B. Construction Process and Instructions
The construction method of fiber-added asphalt concrete is basically the same as that of traditional asphalt concrete, but there are also differences.
★ Precautions for the Selection of Fiber-Added Asphalt Concrete Mixing Equipment
1. Due to the addition of fibers, it is necessary to extend the dry and wet mixing time to ensure that the fibers are evenly coated on the aggregates. The production capacity of the mixing equipment will decrease slightly. The decrease in the production capacity of the mixing equipment leads to an extension of the construction period, so when making a construction plan, the mixing capacity of the mixing equipment should be considered, or the construction of the subgrade and base course should be accelerated to leave sufficient and reasonable construction time for the asphalt pavement layer.
2. For traditional continuous mixing equipment, special fiber-adding equipment must be added. Because the proportion of fibers in the mixture is very small, the accuracy of the equipment will be an important factor affecting the mixing quality. Uneven fiber addition will also lead to excessive or insufficient use of the mixture, affecting the project quality. Therefore, it is advisable to use traditional batch mixing equipment and manually add fibers, which is economical and easy to operate.
★ Mixing Requirements for Fiber-Added Asphalt Concrete
1. Determine the mix ratio of each batch of hot material bin, calculate the mass of each batch of mixture, and calculate the mass of fibers to be added to each batch of mixture according to the fiber usage determined by the target mix ratio, ensuring the accuracy of measurement.
2. The asphalt mixture should be trial-mixed according to the designed asphalt content. After trial mixing, samples should be taken for Marshall test, and the test values should be compared with the results of the indoor mix ratio test to verify the rationality of the designed asphalt content, and appropriate adjustments can be made if necessary.
3. Determine the appropriate mixing time. For ordinary asphalt mixtures, the mixing time for batch mixing equipment is 45-60 seconds. After adding fibers, the mixing time will be extended by 10-15 seconds. The recommended dry mixing time is 15-20 seconds, and the wet mixing time is also slightly longer than that of ordinary asphalt mixtures, ensuring that the mixture is evenly mixed and the fibers and asphalt mixture are well coated.
4. Determine the appropriate mixing and discharge temperature. The heating temperature of asphalt should be 130℃~160℃. Heating should not exceed 6 hours, and the heated material should be used up on the same day, and should not be heated repeatedly to avoid aging. The heating temperature of crushed stone is 140℃~170℃, and mineral powder is not heated. The discharge temperature of asphalt mixture should be 130℃~160℃. When using modified asphalt, the upper limit of the above temperature should be increased by 10℃~15℃. No temperature adjustment is needed for fiber addition.
Note: During specific construction, the construction process should be appropriately adjusted according to the differences in raw materials and various environmental factors to achieve optimal performance.
VIII. Supporting Value-Added Services
★ Provide economic analysis of adding HD series polyacrylonitrile fibers according to customer needs;
★ Provide consultation on asphalt mixture mix ratio design when adding HD series polyacrylonitrile fibers according to customer needs;
★ Provide on-site construction process guidance;
★ Provide supporting automatic adding and metering devices to realize automation and precision in the addition and metering during production.
Headquarters: 7th Floor, Tower B, R&F Center, Tongzhou District, Beijing
Zip Code: 101100
Telephone:010-58859568
Fax: 010-81580920
E-mail:bjhoude@chinahoude.com
