Wanda kang agricultural
science and technology
Tea saponin construction of concrete (cement), air-entraining agent, product introduction)
Air-entraining agentIs an important independent varieties in the concrete admixture, its main effect is to greatly improve the frost resistance durability of concrete, at the same time, the durability of concrete construction, and other comprehensive performance is also a significant improvement.Tea saponin concrete air-entraining agent has significantly reduced the surface tension of solution function, have closed, independent of the bubble, high expansion ratio, number of air bubbles, bubbles, small spacing, bubble is a long time, can obviously improve the working performance of plastic concrete and improve the durability performance of hardened concrete, is a great prospect of application in concrete engineering both at home and abroad high-quality air-entraining agent.
A, product awareness
1. Raw materials and production process: tea saponin air-entraining agent is the distribution of natural wild plants in southern China tea seed fruits as raw materials, through extraction, synthesis process refined but become.
2. Physical properties and chemical composition: the product has two kinds of powder and liquid.Tea saponin air-entraining agent is a kind of natural non-ionic surface active agent, the main ingredients for natural triterpenoid saponins, soluble in water, acid, alkali and hard water has a strong chemical stability.
Second, the main features
1. The content is less, the quality of the air bubble good tea saponin (triterpenoid saponins) concrete air-entraining agent (powder) suggested dosage is 0.5 ~ 3.0 per, the weight of the cement dosage is small, the cost is low.Can introduce concrete in the bubble was more than 1 billion, the introduction of air bubbles for discontinuous closed spherical, aperture range of 0.02 ~ 0.02 mm, uniform distribution, stability is good.When the air content 5% or higher, bubble spacing coefficient L < 100 microns, when the air content is 6%, bubble spacing coefficient of L is about 80 microns.
2. With other admixture concrete composite performance is excellent, the product water soluble is extremely strong, on the additive compound, has good compatibility, can fully embody the "synergy," compound effect is better than that of a single dose.Water reducing, dispersion, wetting, help to dissolve, solubilization, emulsification and viscosity etc all have varying degrees of increase, to avoid the other kind of air-entraining agent composite easy occurrence of precipitation, reduce the phenomenon of discoloration, air-entraining effect, can reduce the composite cost is about 5%.
Third, scope of application
1. North concrete roads, Bridges and de-icing salt;
2. Used for concrete durability (especially the frost resistance durability) demanding concrete structures, such as hydraulic, port engineering and road and bridge engineering;
3, high requirements for construction and robustness of concrete engineering;
4, is the concrete pumping agent and other composite admixture of concrete is an important part, such as pumping concrete;
Four, the main performance
1, raw material craft: the tea saponin air-entraining agent with natural wild plants as the main raw material, extracted from plants and refined but become.
2, physical and chemical properties: this product is a nonionic surfactant, good solubility, acid resistance, alkali resistance, resistance to hard water.
3And components:,Main ingredients are organic triterpenoid saponins (tea saponin).
4, the types of products: this product divides the two kinds of powder and liquid agent, powder product is light yellow or light brown,Soluble in water;Liquid product is brown, sticky, opaque, baume degree18 be p, no sediment.
Five, the product features
1, bubble good quality: this product to bubble diameter range0.02~0.20 mmFor discontinuous closed spherical, uniform distribution, Stability is good.When the air content5.0% or higherWhen the bubble spacing coefficientL < 100 micronsWhen the air content of6.0%When the bubble spacingLabout80 microns。
2、 On the influence of concrete: this product can improve the liquidity and plasticity of concrete, reduce secrete water and segregation, improve the flexural strength15%The left and right sides.At the same time, the thermal diffusion, heat transfer coefficient of concrete is reduced, can make the volume stability of concrete and the structure of the various outdoor weathering resistance is improved.Road concrete is widely using the air-entraining agent is helpful to extend the service life of road.Under the same conditions,When the air content is less than3%, concrete compressive strength is not only not decline, has also increased slightly;Air content in the5%, increase unit air content, compressive strength of concrete loss rate not greater than3%.Although this product on the compressive strength of concrete has a certain influence, but air content is less than5% Rather than reduce, the flexural strength,Instead, for the road concrete engineering is very beneficial.This product of concrete durability also has other significant improvements, bleed air is introduced into the tiny air bubbles can be used as a buffer space volume expansion, reduce and delay the other physical expansion(Such as salt crystals crystallization pressure, etc)And chemical reaction in inflation(Such as alkali aggregate reaction and sulphate, etc)Damage caused by concrete.Test result shows at the same time, this product can also improve the permeability resistance of concrete, only from this point, the air-entraining agent can improve the comprehensive durability of concrete.
3Strong, the distribution of performance: This product is water soluble, With other admixture compound with superior performance, can fully embody“Synergistic effect”.After the distribution of water reducing, dispersion, wetting, help to dissolve, viscosity and other properties to some extent, avoid the rosin type air-entraining agent when composite easy occurrence of precipitation, change color, air-entraining effect to reduce the phenomenon.Can reduce the composite cost5.0-5.5%The left and right sides.
6, using the method
The product powder suggested dosage of cement weight per0.5 to 3.0Suggested dosage, liquid agent for cement weight per0.5 to 5.0, can appropriate adjust dosage by air content test results.When using can dissolve in water directly, also can mix with other powdered admixtures according to any proportion.Batch time: conventional concrete> 2Minutes, RCC> 3Minutes.
Seven, the matters needing attention
1And for the dosage of this product in0.005-0.01%when,Strength is small,When using dosage is bigger,What should be considered in the mixture ratio design influence on strength. Dedicated to pumping agent content of powder as0.005%Left and right sides, fluid as0.008%The left and right sides.
2, high water reducing rate, and after the contrast test of air-entraining agent, to maintain the slump constant, should reduce water consumption and water cement ratio.
3, in the concrete mixed with fly ash,To get the same air content,Air-entraining agent dosage to increase appropriately,Because fly ash adsorption air-entraining agent(So all the air-entraining agent).Air-entraining agent of content related to the quality and content of fly ash.
4Please handle with care when loading and unloading, powder products, are not allowed to use, no heavy fall, avoid is weight, mat wood cushion, when stored shall be moistureproof, this product easy absorption of moisture, be affected with damp be affected with damp agglomerate does not affect the use effect, but the composite with other powder products, please choose a crushing or grinding function of fine mixer sieve composite. The composite or
Eight, packaging and storage
1Packing: powder5Kg/Bag, liquid150 Kg/B/d.
2And storage: powder for two years, fluid for half a year in the winter, summer for three months, the user can choose according to need.