Shotcrete Materials
Superior bond strength with Shotcrete materials from Multicrete
Our selection of Shotcrete materials covers a variety of applications, including dry mix, wet mix, cold temperature, and more. Whether you need an abrasion-resistant mix, enhanced load carrying capacity, or high-velocity shooting characteristics, we have the mix for you.
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Abrasion-resistant Topping Mix
Product
Multicrete Alloycrete™ SF-10 is an industrial, abrasion resistant Topping Mix Enhanced with 60 kgs per M3 (100 lbs/ Yd3) of Dramix Steel Fiber and a special blend of Hardened Iron Aggregate.
Steel fibers provide integral reinforcement and improve the product’s Impact Resistance while the Hardened Iron Aggregates create superior wear resistance.
Uses
Multicrete Alloycrete™ SF-10 is recommended for high-wearing industrial surfaces which are subject to severe abrasion, impact and continuous wear.
Ideal applications are for extreme duty Shop Floors, Ore Passes and Crusher Chutes.
Advantages
Easy application as a Trowel-on material or spray-applied, using conventional dry Shotcrete Equipment.
Superior toughness to conventionally reinforced Concrete.
Greatly improved impact resistance and abrasion resistance.
Packaging
Multicrete Alloycrete™ SF-10 can be custom blended with or without steel fiber reinforcement. It is normally packaged in bulk bags up to 1680 kg (one cubic yard), with double shrink-wrap on wooden pallets.
Safety Precautions
Multicrete Alloycrete™ SF-10 contains Portland cement and other carefully selected additives. Normal safety wear such as rubber gloves, dust mask and safety glasses used to handle conventional cement based products should be worn.
Please refer to TDS and SDS for detailed information.
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For Cold Temperature Applications
Multicrete XPR™ Shotcrete is a pre-blended, dry shotcrete based on a modified hydraulic cement for a very rapid strength gain.
Multicrete XPR™ Shotcrete also has greatly enhanced shooting characteristics and physical properties due to specially selected admixtures
Uses
In the dry process, the Multicrete XPR™ Shotcrete is blown through the hose and mixing water is added at the nozzle. The shotcrete impacts the surface at a high velocity resulting in a well-compacted, high quality concrete with excellent bond. Multicrete XPR™ Shotcrete was specially developed for the following shotcrete applications:
- Areas requiring Rapid Strength gain (+/-2500 psi in 3 hrs)
- Spraying onto frozen ground such as structural tunnel linings.
- Cold weather use.
Multicrete XPR™ Shotcrete may be used in combination with steel fiber reinforcement to enhance load-carrying capacity and accelerator to provide fast set times.
It can be blended to meet ACI 506 gradation #1 or #2.
Advantages
- Rapid Strength Gain. Multicrete XPR™ Shotcrete is specially designed to meet the demands of high early strength for structural support which cannot be met with a conventional Portland cement based product.
- Stickiness. Multicrete XPR™ Shotcrete has vastly improved cohesion characteristics compared to conventional shotcrete .This stickiness saves time and money because:
- Rebound is significantly reduced, resulting in lower material usage
- Sagging and sloughing are eliminated.
- Thick layers can be applied in a single pass in both the vertical and overhead orientations without the use of caustic accelerators.
- This increases shooting efficiency as passing over work two or three times to achieve a certain thickness is no longer necessary.
- Physical properties: Silica fume in Multicrete XPR™ Shotcrete creates a higher strength shotcrete with low permeability and excellent freeze/thaw durability.
- Resistance to water washout: Multicrete XPR™ Shotcrete in the plastic state has tremendous resistance to washout by flowing water. This resistance allows Multicrete XPR™ Shotcrete to be applied to moderately wet surfaces
Please refer to TDS and SDS for detailed information.
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For Dry Mix Applications
Multicrete Megastick® Shotcrete-Dry is a pre-blended shotcrete mixture containing aggregates, silica fume and other carefully selected additives. Multicrete Megastick® Shotcrete-Dry has greatly enhanced shooting characteristics and physical properties.
Uses
In the dry process, Multicrete Megastick® Shotcrete is blown through the hose and mixing water is added at the nozzle. The shotcrete impacts the surface at a high velocity resulting in a well-compacted, high quality concrete with excellent bond. Some common uses include:
- Slope stabilization
- Initial and secondary tunnel support
- Structural linings
- Concrete rehabilitation
Multicrete Megastick® Shotcrete-Dry may be used in combination with steel fiber reinforcement to enhance load carrying capacity and with non-caustic accelerator to provide high early strengths and faster set times. It can be blended to meet ACI 506 gradation #1 or #2.
Advantages
Stickiness.
Multicrete Megastick® Shotcrete-Dry has vastly improved cohesion characteristics compared to conventional shotcrete. This stickiness saves times and money:
- Rebound is significantly reduced, resulting in lower material usage
- Sagging and sloughing are eliminated
- Thick layers can be applied in a single pass in both the vertical and overhead orientations without the use of caustic accelerators.
- This increases shooting efficiency as passing over work two or three times to achieve a certain thickness is no longer necessary.
Packaging
Multicrete Megastick® Shotcrete-Dry can be custom blended with or without steel fiber reinforcement. It is normally packaged in bulk bags up to 1680 kg (one cubic yard), with double shrink-wrap on wooden pallets.
Please refer to TDS and SDS for detailed information.
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For Wet Mix Applications
Multicrete Megastick® Shotcrete-Wet is a pre-blended shotcrete mixture containing aggregates, silica fume and other carefully selected additives. Multicrete Megastick® Shotcrete-Wet has greatly enhanced shooting characteristics and physical properties.
Uses
In the wet process, the Multicrete Megastick® Shotcrete is pumped through the hose and compressed air is added at the nozzle. The shotcrete impacts the surface at a high velocity resulting in a well-compacted, high quality concrete with excellent bond. Some common uses include:
- Slope stabilization
- Initial and secondary tunnel support
- Structural linings
- Concrete rehabilitation
Multicrete Megastick® Shotcrete-Wet may be used in combination with steel fiber reinforcement to enhance load carrying capacity and with non-caustic accelerator to provide high early strengths and faster set times. It can be blended to meet ACI 506 gradation #1 or #2.
Advantages
Stickiness.
Multicrete Megastick® Shotcrete-Wet has vastly improved cohesion characteristics compared to conventional shotcrete. This stickiness saves times and money:
- Rebound is significantly reduced, resulting in lower material usage.
- Sagging and sloughing are eliminated.
- Thick layers can be applied in a single pass in both the vertical and overhead orientations without the use of caustic accelerators.
- This increases shooting efficiency as passing over work two or three times to achieve a certain thickness is no longer necessary.
Packaging
Multicrete Megastick® Shotcrete-Wet can be custom blended with or without steel fiber reinforcement. It is normally packaged in bulk bags up to 1680 kg (one cubic yard), with double shrink-wrap on wooden pallets.
Please refer to TDS and SDS for detailed information.
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Chloride Free Designed for use with Shotcrete
Multicrete™ Shotcrete Set Accelerator is a chloride-free, dry powder accelerator designed for use with shotcrete. It is also suitable for use as a set accelerator in some other Portland cement products such as concrete mixes.
Uses
- A major use for this product is in accelerated shotcrete for mining, tunnelling or rock stabilization operations where rapid set or high early strength are required for structural support.
- Accelerated shotcrete is also used for rapid sealing of water seepage through rock, earth or concrete.
- In situations where rapid installation of a reinforced shotcrete is needed, steel fiber reinforcement can be included in the mix to provide the required performance.
Advantages
- In addition to the advantages of rapid set and high early strength, Multicrete™ Shotcrete Set Accelerator has the advantage of being less caustic and less hazardous to personnel than the Portland cement products to which it is added.
- The dry powder form of this product is ideal for dryprocess shotcrete applications and provides added convenience for transportation, storage and application.
Procedures
Determine the amount of Multicrete™ Shotcrete Set Accelerator needed to give the required setting time and rate of strength development for the planned application. The temperature during mixing and curing must be considered during the testing because, like most chemical reactions, the degree of acceleration is reduced as the temperature is lowered. In general, the addition of 1% to 5% of Multicrete™ Shotcrete Set Accelerator by weight of cement will provide satisfactory results. The most common addition rate is 3% to 4%.
Higher addition rates can be used for applications such as water sealing where very rapid setting is essential, and a slight reduction of the final strength is acceptable.
For dry-mix bagged shotcrete applications, it is preferable to premix the shotcrete and the accelerator before adding water. The premixing can be done during batching of the shotcrete, or an additive dispenser can be included in the application equipment. In some cases, on-site additions of set accelerator are undesirable because of conditions such as the lack of suitable dispensing equipment or the absence of adequate quality control.
Multicrete manufactures and supplies a wide range of dry-bagged, premixed standard and accelerated shotcrete, with or without silica fume or steel fiber reinforcement.
The premixed product is supplied in standard paper bags, or in bulk sacks of up to 1 cubic yard.
Packaging
Multicrete™ Shotcrete Set Accelerator is packaged in 2000 lb. bulk bags. Custom-size packaging available.
Please refer to TDS and SDS for detailed information.
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For Increased Load Bearing Capacity
The water-soluble Dramix® bundles are the only real guarantee of obtaining a homogeneous distribution of high performance steel fibers without special equipment and without considerably increasing the mixing time.
The glue specially developed allows the use of Dramix® steel wire fibers with high L/D ratios in bundles for wet as well as for dry spraying.
Dramix® steel fibers can be added to the mixer or the batching equipment – either on site or at the ready mix plant – or in dry packed mortars delivered in big bags or in silos.
Dramix® steel wire fibers can be added with automatic dosing and dispensing equipment .
Technical Advantages
- The homogeneous reinforcement gives a resistance to tensile stresses at any point in the shotcrete layer.
- An increase of load-bearing capacity due to the redistribution of stresses
- The removal of the mesh increases the bond of the shotcrete to the surface
- Excellent corrosion resistance. The use of Dramix® instead of mesh results in a good quality homogeneously reinforced concrete. A high degree of density and impermeability prevents the formation of water passages. Despite the eventual appearance of rust spots on the surface, no spalling will occur in the concrete. If aesthetics are a major concern a thin coat of unreinforced shotcrete can be applied.
Excellent control of cracks due to shrinkage and temperature gradients.
Economic Advantages
- Allows the shotcrete to follow the contours resulting in a consistent thickness, which provides a significant reduction in shotcrete consumption
- The use of Dramix reinforced shotcrete minimizes losses due to rebound
- The elimination of the need to install mesh and the reduction in the time for which the lifting equipment is needed results in a reduction of cycle times and overall costs
- The elimination of the difficult and even dangerous job of installing mesh considerably increases safety at work site
Please refer to TDS and SDS for detailed information.
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Liquid Alkali-free Shotcrete Accelerator
P1AF (Premixed) is a high-performance, Alkali-free Set Accelerator for shotcrete applications.
Applications
P1AF (Premixed) is suitable for both dry and wet spraying processes and it is used for:
- Support at the face while advancing tunnels and mines
- Rock and slope stabilization
- High quality lining shotcrete
Advantages
P1AF (Premixed) liquid shotcrete set accelerator has the following characteristics and advantages:
- High early strength development
- Alkali and Chloride free
- No pollution of groundwater by leaching of alkalis
- Distinct reduction in rebound
- Improves bond of shotcrete to rock and concrete thus facilitating overhead spraying
- Distinct reduction of dust
Please refer to TDS and MSDS for detailed information.
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SIKA P1AF Shotcrete Accelerator
Shotcrete Admixture
Sigunit® P1AF is a water-soluble, alkali free and high-performance shotcrete accelerator in powder form. When dissolved in water it produces an alkali free set accelerator for wet sprayed shotcrete.
Where to Use Sigunit® P1AF is suitable for wet-process shotcreting. The principle applications for Sigunit®- P1AF are:
- Support at the face whilst advancing tunnels and mines.
- Rock- and slope stabilization.
- High quality lining shotcrete.
Advantages
The most outstanding advantages of Sigunit®-P1AF shotcrete accelerator are:
- Alkali-free, avoiding additional leaching of alkalis and pollution of ground and surface water.
- When correctly used, marginal reduction of shotcrete strength.
- Reduction of rebound.
- Easier overhead spraying by improved bond of shotcrete to rock and concrete.
- Reduction of dust formation.
- Chloride-free, suitable for steel reinforced shotcrete and substrates.
- Easy to dissolve on site in time for shotcreting.
- Converting powder to liquid on site, the temperature will rise to approx. 40ºC (104ºF); the warm solution will increase the accelerator effect considerably.
- Lower cost of logistics.
Please refer to TDS and MSDS for detailed information.
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Silica Fume
For Increased Stickiness & Strength of Shotcrete
Description
Silica Fume is an extremely fine powder having particles 100 times finer than cement particles. Due to the purity of the raw materials used in the production process, the chemicals and physical composition of the Silica Fume remains constant.
Uses
The use of Silica Fume Concrete is recommended for sewage pipes, waste water treatment plants, food and dairy products plants, pulp and paper plants, fertilizer plants and for any concrete work that may be in contact with aggressive chemical products.
Advantages
Silica Fume reacts with the weak products of the cement hydration. The pores are finer and better dispersed. The bonding between the cement past e and the aggregate is improved.
Improved durability of Silica Fume concrete is the reduction in permeability. This is the result of a very refined and dense microstructure and reduced porosity.
Silica Fume concrete is more resistant to chemical aggressive agents of all kinds than ordinary or latex-modified concretes.
The direct introduction of the as-delivered Silica Fume into the concrete mixture provides flexibility to the producer in terms of dosage, types of application and anticipated results.
Silica Fume is a highly reactive cementitious material that acts at the same time as a filler and a pozzolane.
Silica Fume concrete is durable and resistant to freeze-thaw cycles. Silica Fume Concrete with a lower cement content and higher water/cementitious materials ratio performs very well after more than 550 freeze-thaw cycles.
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SIKA P1AF Shotcrete Accelerator
Shotcrete Admixture
Sigunit® P1AF is a water-soluble, alkali free and high-performance shotcrete accelerator in powder form. When dissolved in water it produces an alkali free set accelerator for wet sprayed shotcrete.
Where to Use Sigunit® P1AF is suitable for wet-process shotcreting. The principle applications for Sigunit®- P1AF are:
- Support at the face whilst advancing tunnels and mines.
- Rock- and slope stabilization.
- High quality lining shotcrete.
Advantages
The most outstanding advantages of Sigunit®-P1AF shotcrete accelerator are:
- Alkali-free, avoiding additional leaching of alkalis and pollution of ground and surface water.
- When correctly used, marginal reduction of shotcrete strength.
- Reduction of rebound.
- Easier overhead spraying by improved bond of shotcrete to rock and concrete.
- Reduction of dust formation.
- Chloride-free, suitable for steel reinforced shotcrete and substrates.
- Easy to dissolve on site in time for shotcreting.
- Converting powder to liquid on site, the temperature will rise to approx. 40ºC (104ºF); the warm solution will increase the accelerator effect considerably.
- Lower cost of logistics.
Please refer to TDS and MSDS for detailed information.