A brief introduction of high strength wear resistant castable

High strength wear-resistant is composed of high strength aggregate, powder mineral additives and a variety of polymers, through the optimized formula design, with the minimum wear-resistant loss, high strength, arbitrary shape can be controlled, strong integrity, simple construction, good construction performance, due to the addition of high polymer, make its base concrete bond firmly.This product is cheap in price, and is the preferred material for the construction site with wear-resistant requirements.

High strength abrasive is a kind of cement base composite single component dry mortar, which is made up of high strength cement, mineral admixture, high strength aggregate and crack and wear resistant agent through industrial production.The field water mix can be used, good construction workability, through artificial rendering in a bunker or trough anti-wear layer of surface to form certain thickness after normal maintenance can meet the technical requirements, with high wear resistance, with the base concrete (steel cylinder storehouse) high bonding strength, strong impact resistance, high compressive strength, good durability and long service life, etc.It is specially used to protect the foundation concrete (or steel silo) in slag ditch, ore trough, coal discharging trough, hopper, lining anti-wear layer of material silo of metallurgical, coal, thermal power, chemical industry, cement and other industries, and the anti-wear layer of sluice gate and discharging hopper of water conservancy, hydropower, port and other projects.

I. scope of use

1. Coal discharging ditch, coal scuttle, coal storage bunker, dry coal grid, dumper, slag catcher, water treatment, etc.

2. Corrosion resistant ground and pump foundation of chemical industry.

3. Wear resistant lining board in gangue bin, medium bucket, scraper, bucket lift machine, chute, sieve funnel and so on in the coal industry.

4, iron and steel industry mixing bin, sintering bin, feeder, ball making machine.

Ii. Product features

1. High strength, high wear resistance, impact resistance, erosion resistance, oil seepage resistance

2, flame retardant, low water absorption, high and low temperature resistance

3, good durability, long service life

4, simple construction, quick operation, easy to master

5, good integrity, easy to repair, not easy to fall off 6, non-toxic, tasteless, green environmental protection, no physical damage to the operator

Compressive strength MPa ≥ 60 abrasion Kg/m 2 ≤ 0.1 elastic modulus MPa ≥ 4.0 × 10 4 temperature resistance ℃ ≤ 500 friction coefficient \ ≤ 0.15 construction temperature ℃ ≥ 5 bulk density Kg/m 3 2200~2400

Coal gangue, ore ≥ 100 50~60 smaller coal, ore ≥ 50~100 40~50 small coal, ore ≤ 50 30~40 pulverized coal, mineral powder \ 20~30

1, grass-roots processing

(1) clean the foundation surface without debris such as crushed stone, floating pulp, floating ash and mold release agent.Loose parts on the foundation surface should be removed.

(2) it is beneficial to fully gouge the original surface layer and increase the surface roughness to improve the bonding strength.

(3) the concrete base shall be embedded with steel mesh.

2, laying the plum flower nail, steel mesh concrete base drilling deep 50 mm, aperture 10-12 mm (Φ 6-10, Φ 8-12);The reinforcement bar is anchored with planted bar glue. The embedded depth of the reinforcement bar is 50mm and the exposed 15-30mm (1/2 of the designed anti-wear layer thickness). The spacing between the reinforcement bars is 250-300mm.The anti-wear layer thickness is less than 50mm, which can be bent into "L" at the front end of the bar. If the thickness is more than 50mm, the top of the bar shall be welded into a net with wire rod.

3. Water shall be used to flush the silo before applying the interface agent to clean up the floating ash on the surface and fully wet the foundation surface.After 2 hours, mix the interface treatment agent with cement and sand in a ratio of 1:1:1 evenly, and then evenly brush the surface of the treated concrete foundation without missing the brush.Brush interfacial agent to reach the degree of finger contact drying.

4. Mixing of abrasive resistant materials

(1) when mixing high-strength abrasive materials, the water consumption can be appropriately adjusted according to environmental conditions and actual working conditions, and can be used after mixing evenly.Mixing water shall meet the requirements of the existing standards for concrete mixing water (JGJ63).

(2) the grinding material can be mixed by mechanical or manual stirring.Mechanical stirring is recommended, and the stirring time is generally 2~3 minutes.When using manual stirring, 2/3 of the water consumption should be added to mix for 4 minutes, and then the remaining amount should be added to stir until it meets the construction workability.

(3) the mixing site should be as close to the construction site as possible to reduce the transportation distance.

(4) the amount of stirring should be determined according to the amount used, so as to ensure that the material is used up within 30 minutes.

(5) during the winter construction, the mixing water of high strength abrasive resistant materials should comply with the relevant provisions of the current "construction regulations for construction projects in winter" (JGJ104).It is recommended to use about 50 ℃ hot water to stir, so that the temperature of fresh mix is not less than 15℃.(6) add water (generally 13-15%) and consistency suitable for construction, and the mixing location should be as close as possible to the construction site.

5, abrasive construction abrasive construction from the upper part of the project from the construction, plastering should be forced to press.Each plastering thickness with 20mm is appropriate, the thickest should not exceed 30mm.When the anti-wear layer is thick, the first layer and the plastering layer reach the initial setting state and continue the plastering construction until the designed wear-resistant layer thickness.It is advisable to control the construction time within 45 minutes from the addition of water and stirring of high strength abrasive material to the completion of construction.Therefore, the amount of stirring should be matched with the construction speed.

6, calender according to climate conditions, 1-2 hours after the initial setting state to be calender treatment.Calendering process is very important, can reduce the roughness of anti-wear layer, is conducive to smooth discharge, if the construction thickness is thick prone to appear plastic crack, so in the first calendering 1-2 hours after the second calendering.

7, maintenance of summer construction, should be completed within 2 hours after the completion of construction, high-strength abrasive water maintenance after the initial setting.Winter construction, construction should be immediately covered with plastic film, and covered with straw bags or rock quilt.Curing period is 7 days, after curing expires, protective measures can be discharged.It is recommended that after 28 days, the wear resistant layer reaches the final strength before it is put into use.