PVA Fiber

PVA fiber is by dissolving polyvinyl alcohol as the main raw material, extrusion, spinning, stretching, heat setting,
Acetal, washing, oiling, drying, high strength and high modulus fibers made of chopped. The product has a high strength, high elastic modulus, low elongation, dispersion, etc., and acid, alkali, salt, abrasion resistant, UV resistant, corrosion-resistant characteristics of cement affinity better applicable enhanced in a variety of materials. Initially take into account environmental factors, in foreign countries, mainly as a replacement of asbestos. As technology advances, is now widely used in water conservancy and hydropower dams, basements, harbor works, the wind farm foundation engineering, cement, prefabricated panels and other high-performance concrete

Stress the role of polyvinyl alcohol fibers in the concrete, can ease the temperature within the concrete, to prevent temperature crack propagation;, but also beneficial to its antifreeze capabilities can be used as a concrete difference in temperature compensation crackmeans.

Second, the main function
1, high strength and high modulus PVA fibers due to its good hydrophilicity, adhesion and impact resistance as well as processing
Easy dispersion properties, a wide range of applications in industrial, construction and other fields;
2, high strength and high modulus PVA fibers can be applied to the strengthening of concrete construction;
3, good mechanical properties, can improve the toughness and impact strength of building materials;
4, acid and alkali resistance, suitable for various grades of cement;
5, the dispersion is good, building materials can be a long time to maintain a smooth surface, and no spalling;
6, the bending temperature and cold resistance of the cement board and cement brick;

7, with less (of PVA is only 1/5 of the asbestos), the unit weight of the products can be effective in reducing operating
Conditions significantly improved;
8, the low permeability of concrete, to prevent the corrosion of reinforcing steel bar, so the concrete easily weathered, are less vulnerable to climate
Impact.

Third, the application areas
1, the impermeability of concrete crack resistance, impact resistance, corrosion resistance requirements of high thermal power projects, wind farm foundation engineering, hydropower engineering, tank, engineering, recycling pump station caisson mass concrete;
2, precast concrete panels, hollow box, solid box, bridges up and down the structure;
Port Works: Pier situ layer and wear layer, retaining wave wall, slope protection berm project;
4, hydraulic engineering: Chi Hung Tao, RCC dam, diversion tunnel floor, dam panel, slope protection, etc.;
, Water treatment systems: concentrated pool corruption pool, to clarify the pool, pool wastewater, pulp and pool, cooling tower, the word column, parterre, cylinder, pool and base;
6, the inner wall of the tunnel mine shotcrete, explosion, fire engineering, air defense military works, oil platforms.

Fourth, the amount of fiber mixing
For insulation mortar and fiber reinforced cement board, per cubic meter of mixture is mixed with 0.6 ~ 1.0 kg, commonly used for
0.6 kg;
For high-performance concrete enhancement, per cubic meter of mixed feed adding 0.6 to 1.2 kg, the standard dosage of 0.9 kg or
By 1.0 kg.

Fifth, instructions for use
, According to the square each time stirring the mixture in accordance with the calculated ratio requirements by adding fiber weight;
2, the use of available artificial in fiber and sand, stone and other aggregates at the same time to join, it is best to make the fiber in the sand and gravel compound
, Then adding water to the wet mix;
3, mixing time than the plain concrete mixing time is slightly longer than the 45 ~ 60S in order to ensure that the fiber is uniformly dispersed in the mixture;
4, fiber reinforced concrete and plain concrete construction and maintenance process.

Six, specifications and packaging
Specifications: PVA-RY6/12
Packaging: 0.9 or 1.0kg / bag, 20kg plastic woven bags.

Polyacrylonitrile fiber

Polyacrylonitrile fiber based on polyacrylonitrile resin as raw material, made by a special process. With the traffic volume,
Especially the increase in heavy vehicles, traffic, pavement quality requirements have become more stringent, to improve road durability is an important method is to join the stability of additives in the asphalt mixture, polyacrylonitrile fiber is not only additive, but can improve the colloidal structure of asphalt, for the asphalt mixture, can play the role of reinforced adsorption asphalt, etc., high temperature stability, and improve the bond strength.

With the development of the project, polyacrylonitrile fiber applications is becoming increasingly widespread. Cement concrete as a stiffener material, which can effectively suppress the plastic cracks and shrinkage cracks in concrete early to improve the toughness and impact resistance of concrete to improve the concrete frost resistance, impermeability, durability of the road. be more widely used in the construction of bridges, tunnels, water conservancy, port, industrial and civil construction projects.

Second, the main function
Used in asphalt concrete

1. Sorption of a polyacrylonitrile fiber
Fiber diameter is relatively small, large surface area per gram of fiber surface area up to several square as much as fiber
Dimensional dispersion in the asphalt, asphalt and fiber will be generated between the physical and chemical effects, the asphalt layer of a single molecular arrangement in the fiber surface, to form a binding rugged construction asphalt interface layer. At the same time, the fiber and the surrounding structures asphalt wrapped to cover the surface of the aggregate, the aggregate surface of the asphalt membrane increases, to slow down the speed of asphalt aging and extend the useful life of the pavement by the use of

2, polyacrylonitrile fiber reinforced role
Three-dimensional random distribution of fibers in Mastic, these fibers play a role in blocking the cracking of the mixture, thus
Asphalt pavement crack self-healing capabilities, and reduce the appearance of cracks. But is not all of the fiber can play this role due to the low tensile strength of wood fibers and mineral fibers, it is basically not have reinforced the role of polyacrylonitrile fibers have a higher strength, the reinforcement effect is more obvious.

Used in cement concrete
1, to improve the crack resistance of concrete
Early concrete shrinkage cracks, shrinkage cracks, settlement cracks, thermal stress cracks
Have a significant effect. The early cracks in the plastic concrete is mainly due to segregation of secretion of water or slurry, the settlement of coarse aggregate, thermal stress, this result, the stress is greater than the strength of concrete will crack, polyacrylonitrile fiber added to improve the ability of concrete to resist the stress of early, thereby preventing the cracks.

2, to improve the impermeability of concrete
By a large number of polyacrylonitrile fiber in the concrete within the three-dimensional chaotic distribution, improve the density of concrete
Resistance and reduce through capillary pore formation.
3, to improve the impact resistance and toughness of concrete
Concrete is a brittle material, brittle fracture can easily be affected so that, the polyacrylonitrile fiber
Entry can absorb the energy of the applied stress, and improve the overall concrete impact energy absorption capacity. First, the tensile deformation of the fiber when the concrete by pressure or tensile failure, due to the absorption of stress, such as fiber fractured concrete began to damage, thereby increasing the toughness of concrete.

Third, the application areas
1 Road: asphalt concrete pavement, cement concrete pavement, municipal roads, etc.;
Underground engineering: civil air defense projects of national defense works, military facilities, tunnels and subway;
3, hydraulic engineering: the harbor pier, dams, spillways, water channels and other engineering facilities;
, Concrete components: panels, poles, trailer coupling, concrete covers, etc.;
5, construction: basement, transfer beam, floor, etc.;
6, ancillary facilities: highway crash safety retaining wall, the impact of the baffle, machinery and equipment base, etc.;

Fourth, the amount of fiber mixing
1, used in asphalt concrete: mixing 2 ‰ to 3 ‰, which is a ton of asphalt mixture mixing 2 ~ 3kg, usually the standard dosage is 2 per thousand, per ton of asphalt mixture mixing 2.25kg;
2, used in cement concrete: cement per cubic concrete mixing 0.6 ~ 1.2kg, the usual standard dosage of 0.9 or 1.0kg;

Fifth, instructions for use
Used in asphalt concrete
A general per ton of asphalt mixture mixing 2kg, calculated according to the volume size of the thermal silo, each plate material mixed with the fiber weight
Amount;
2, adding polyacrylonitrile fiber asphalt mixture when the fiber is not mixed with the same;
3, in accordance with the provisions of mixing amount can be each pouch fiber directly dropped into the mixing equipment, without opening the packaging;
4, with the mixture of dry mix to extend the 15 ~ 30s, and then adding the asphalt wet mix concrete fibers uniformly dispersed on the main principles.

Used in cement concrete
1, generally per cubic meter of concrete polyacrylonitrile fiber content range of 0.6 ~ 1.2kg / m³.
2, in accordance with the changes of the amount of stone, sand, cement and the crack of the project requirements can be adjusted appropriately polyacrylonitrile fiber content up to 1.6kg / m³.
3, the original concrete mix without change, we recommend the adoption of compulsory mixing equipment. Fibers and other materials (sand, stone, cement, etc.) with the input feed port, and then stir in accordance with conventional methods of production can be stirring may be appropriate to extend the mixing time of 30 ~ 60s, in order to ensure a uniformly dispersed.
4, the initial use, to be the mixer after mixing is complete random sampling, such as the fiber is uniformly dispersed, directly ready for use, if there are bundles of fibers are slightly extend the mixing time
5, construction and maintenance should continue to strictly implement relevant building codes.

Six, specifications and packaging
Specifications: PAN-RY6/12;
Packaging: 0.9kg / bag or 1.0kg / bags, 18 or 20kg plastic woven bags.