Description
Basalt short fiber new material replaces steel fiber
Our company focuses on the research, development, production and sales of basalt fiber products;
Our company has developed and tested steel fiber reinforced concrete products for more than one year;
Basalt short fiber products instead of steel fiber have been developed.
After more than one year of research and development and experiment; Basalt staple fiber products have been developed to replace steel fibers.
Through the laboratory comparative test of Chongqing Construction Engineering Group, the same effect of basalt fiber mixed with concrete compared with steel fiber is obtained (see Annex). Pressure resistance increased by 20%; This basalt staple fiber is very special and is the product of our R & D team.Achieve the effect of steel fiber and reduce the cost by 50%.
Please communicate with us if you have any questions, and we will give our full assistance.
Basalt fiber cement concrete and Comparison of steel fiber reinforced concrete1. Chopped basalt fiberBasalt fiber is an inorganic fiber material. It is a continuous fiber rapidly drawn from pure natural volcanic rock after melting at high temperature of 1450 ~ 1500 ºC. Its appearance is golden brown, with excellent comprehensive performance and low price. Today, when paying attention to green, environmental protection and resource saving, basalt fiber is an ideal material, It has broad application fields and development prospects. Chopped basalt fiber is an inorganic mineral fiber with a length of less than 50mm and can be evenly dispersed in cement concrete.2. Characteristics of chopped basalt fiber(1) The naturalness of raw materials. Because the raw material for producing continuous basalt fiber depends on natural volcanic rock, there are no ingredients harmful to human health except that it has inherent high chemical stability and thermal stability.(2) Comprehensive performance. Basalt fiber is truly a "multi-functional" fiber. For example, both acid and alkali resistant, both low temperature and high temperature resistance, insulation and sound insulation, tensile strength is 3 times higher than steel fiber, basalt fiber corrosion resistance and corrosion resistance are better than steel fiber, has a higher compressive strength, shear strength and adaptability in harsh environment, and has excellent comprehensive properties.(3) Low cost. The price of basalt fiber for cement concrete is obviously lower than that of steel fiber.(4) Natural compatibility. Basalt fiber is a typical silicate fiber, which is easy to disperse when mixed with cement concrete and mortar. The newly mixed basalt fiber concrete has stable volume, good workability and durability, and has superior high temperature resistance, anti-seepage, crack resistance and impact resistance.3,Technical indexes of basalt fiber | Test items | Chopped basalt fiber for concrete | Chopped basalt fiber for mortar |
| Anti crack fiber | Toughened reinforcing fiber | Anti crack fiber |
| tensile strength/MPa ≥ | 1050 | 1250 | 1050 |
| Elastic modulus/GPa ≥ | 75 | 80 | 75 |
| Elongation at break/% ≤ | 3 |
| Alkali resistance, weight loss rate after soaking for 48H/% ≤ | 1 |
Alkali resistance, monofilament breaking strength, retention
% ≥ | 75 |
4,Characteristics of fiber reinforced concrete(1) Adding fiber into concrete can produce an effective secondary strengthening effect because it forms a uniform random support system in the concrete. The random distribution of basalt fibers can weaken the plastic shrinkage of concrete, and the shrinkage energy is dispersed on countless fibers, so as to effectively enhance the toughness of concrete and reduce the cracks and cracks caused by shrinkage during initial setting of concrete.(2) A large number of fibers evenly distributed in the concrete play a "supporting" role, reducing the water precipitation on the concrete surface and the segregation of aggregate, so as to greatly reduce the content of micro pores in the concrete; At the same time, the addition of fiber reduces the initial primary cracks in concrete, and the obvious crack resistance effect improves the impermeability of fiber reinforced concrete.(3) After the fiber is added into the concrete and mixed, the fiber is distributed in a disordered direction, which reduces the shrinkage stress of the concrete, increases the cohesion of the concrete, effectively prevents the segregation of the concrete, makes it difficult for water migration, and reduces the possibility of plastic shrinkage of the cement mortar.(4) Adding fiber into concrete can improve the shear resistance, splitting resistance and fatigue resistance of concrete, significantly improve the mechanical properties of concrete, and avoid some diseases of ordinary concrete caused by the low above indexes.(5) Adding fiber into concrete, when mixing and pouring concrete, it has no adverse effect on concrete, and has good adhesion, which can improve the cohesion and stability of concrete.5,Mix proportion design of fiber reinforced concreteThe R & D team of our company has developed a new basalt short fiber material, which has higher compressive strength than steel fiber and lower cost than 50% of steel fiber, which is a major breakthrough in replacing steel fiber in concrete; It can not only realize the physical properties of steel fiber, improve the strength, toughness, crack resistance and service life of concrete, but also reduce the service cost by 50% compared with steel fiber. According to the experimental and empirical data, it is suggested to add 5kg basalt fiber to one cubic meter of cement concrete; Steel fiber shall be added into cement concrete according to one cubic meter of cement concrete, which shall not be less than 50kg.6,Cost performance advantages of basalt fiber concreteGenerally, 5kg / m3 basalt fiber and at least 50kg / m3 steel fiber are added to cement concrete. Steel fiber is easy to corrode in cement concrete, the application environment is limited, and the inherent weakness of low tensile strength and poor toughness of concrete is not eliminated. Due to the large ratio and difficult construction operation, steel fiber should sink to the bottom of concrete, resulting in uneven distribution of steel fiber. At the same time, due to the steel fiber on the concrete surface, it is easy to tie the tire, poor driving comfort and loud noise.The strength of basalt fiber is more than three times that of steel fiber. It has strong acid and alkali corrosion resistance. It can increase the basic mechanical properties of concrete (tensile strength, impact resistance, etc.), light specific gravity (basically consistent with the density of cement concrete), and convenient construction. It can make the fiber evenly dispersed in the concrete, form three-dimensional random distribution, and improve the anti-seepage and crack resistance of concrete. Because basalt fiber is flexible, it will not have adverse effects on tires, better driving comfort and low noise.The performance of cement concrete with basalt fiber is better than that with steel fiber. In terms of economy, the price of adding basalt fiber is lower and the cost is more than 50% lower than that of steel fiber. See the following table:Comparison of basalt fiber reinforced concrete and steel fiber reinforced concrete| Specimen name | Basalt fiber concrete | Steel fiber reinforced concrete |
| Specimen size | 100*100*100 |
| Fiber content(Kg/m3) | 5 | 50 |
| 7d Compressive strength | 90.9 | 69.5 |
| 28d Compressive strength | 98.6 | 76.1 |
| 7d Compressive strength comparison | 21.4 |
| Strength increase of basalt fiber concrete24% |
| 28d Compressive strength comparison | 22.5 |
| Strength increase of basalt fiber concret23% |
| Unit price of fiber (USD / kg) | $3.125 | $0.7812 |
| Price of 1 cubic meter of concrete fiber (USD) | $15.625 | $39.06 |
| Black fiber saving rate(%) | 60% |
To sum up, adding basalt fiber to cement concrete is more cost-effective than adding steel fiber.Test pictures of concrete with basalt fiber and steel fiber7,Construction method of basalt fiber cement concrete(1) General requirementsFiber reinforced concrete should be constructed under 25 ºC and above - 5 ºC.(2) Mixing of basalt fiber concreteThe forced mixer shall be adopted. During mixing, the fiber, sand, stone and cement shall be added to the mixer at the same time. Dry mixing is followed by wet mixing, and the mixing time is slightly longer than that of concrete without fiber for 10 ~ 20s, so as to ensure that the fiber can be mixed evenly in the concrete. The basalt fiber concrete mixture shall be mixed evenly and have the same color, without segregation, bleeding and basalt fiber agglomeration.In order to facilitate construction, the mixing amount shall be calculated according to the amount of concrete mixed by the mixer each time before construction, and the basalt fiber shall be packaged separately.(3) TransportationSame as ordinary concrete, no special requirements.(4) PouringThe pouring of basalt fiber concrete shall ensure the uniformity of basalt fiber distribution and structural continuity. During pouring, it is forbidden to add water because the mixture is dry.(5) Concrete vibration and surface finishingDuring pouring, the plate vibrator shall be used for vibration in time, and the plug-in vibrator shall be avoided as far as possible, so as not to affect the fiber lap at the insertion and vibration position; If it is unavoidable, after vibrating with an immersion vibrator, use a plate vibrator for another 20 seconds to restore the three-dimensional distribution of fibers. Due to the formation of three-dimensional network structure after mixing basalt fiber, the slump of concrete will be slightly reduced, but it is prohibited to add a large amount of water artificially. After vibration, unlike ordinary concrete, the slurry output will also be slightly reduced, and the plastering method is the same as the normal method. In order to ensure smooth vibration and surface finishing, the slump must be controlled within an appropriate range. Under site conditions, the transportation time from the concrete out of the machine to the formwork shall be shortened as far as possible to prevent excessive water evaporation from affecting the slump.(6) Precautions for retaining construction jointsThe continuous pouring of concrete shall be kept as far as possible to avoid fiber disconnection at the joint and weakness at the concrete joint. If it is unavoidable, the concrete at the joint can be roughened immediately after the final setting of the concrete, or the influence can be reduced by means of construction and reinforcement.(7) Forming and curingThe concrete mixed with basalt fiber has no special requirements during forming, but the concrete shall be fully vibrated; The concrete mixed with basalt fiber has no special requirements and can be cured as normal concrete.Basalt fiberThe development of basalt fiber began in the Soviet Union in the 1960s. At that time, basalt fiber exceeded glass fiber in some characteristics, its strength was higher than steel, and its high strength retention rate at high temperature of 700 º C attracted the attention of the Soviet . After more than 20 years of continuous practice, Soviet scientists finally developed the production process and technology of basalt continuous fiber.Continuous basalt fiber (CBF) is a new type of inorganic fiber material with high performance. It is a continuous fiber made of volcanic rock (a variety of basalt, natural basalt stone mainly composed of oxides such as silica, alumina, calcium oxide, iron oxide and titanium dioxide) as raw materials, melted at 1450 ºC ~ 1500 ºC and pulled at high speed through platinum rhodium alloy wire drawing leakage plate. Because the fiber color is golden brown, it is also known as "golden fiber". Continuous basalt fiber has the advantages of good stability, good electrical insulation, corrosion resistance, flame retardant, high temperature resistance and low temperature resistance. It has excellent comprehensive performance, low raw material cost, natural environmental protection and high cost performance. Basalt fiber is a pure natural inorganic non-metallic material, which can be degraded into soil parent material and absorbed by soil. It is a green environmental protection product. Performance characteristics of basalt fiber:1. Outstanding temperature resistance. The service temperature range of CBF is: - 260 ~ 900 ºC (softening point is 960 ºC). 2. Outstanding tensile strength: the tensile strength of CBF is 3800 ~ 4800 MPa. 3. Natural compatibility with silicate. It belongs to silicate like cement and has stable performance in alkaline medium.4. Outstanding chemical stability, excellent acid and alkali corrosion resistance and water resistance. 5. Significant thermal vibration stability. The mass loss fraction of CBF at 900 ºC is only 0.03. 6. Good dielectric properties. The volume resistivity is one order of magnitude higher than that of glass fiber, and the dielectric loss tangent is 50% lower than that of glass fiber. 7. Excellent wave transmission performance and certain wave absorption performance.8. It has good radiation protection function.9. Flame retardancy: in case of open fire, it will not burn.Comparison between basalt fiber and other fibers| Performance | Basalt fiber | E glass fiber | Aramid fiber | carbon fibre |
| Density(g/cm3) | 2.65 | 2.7 | 1.45 | 1.78 |
| Service temperature(ºC) | -269~700 | -60~450 | 250 | 200 |
Thermal conductivity
W/(m·K) | 0.031~0.038 | 0.034~0.040 | 0.04~0.13 | 5~185 |
Resistivity
(20ºC)/Ω·m | 1×1012 | 1×1011 | 3×1013 | 2×15-5 |
| Tensile strength(MPa) | 3800~4800 | 3100~3800 | 2900~3400 | 3500~6000 |
| Elongation(%) | 1.25~3.2 | 1.3~2.0 | 2.8~3.6 | 2.7~3.0 |
| Elastic modulus(GPa) | 83.5~110 | 58~75.5 | 70~140 | 230~580 |
| Sound absorption coefficient | 0.9~0.99 | 0.8~0.93 | ― | ― |
Basalt fiber chemical composition:| Chemical composition | Mass percentage |
| SiO2 | 52−58 |
| Al2O3 | 14−19 |
| CaO | 5−9 |
| MgO | 3.0−6 |
| Na2O, K20 | 3−6 |
| TiO2 | 0.5−2.5 |
| Fe2O3, FeO | 9.0−14.0 |
| Other | 0.09−0.13 |
Complaint
