Sika Crackstop 12mm

SIKA CRACKSTOP 12MM – POLYPROPYLENE FIBRES FOR CONCRETE

Description

Sika® Crackstop 12mm fibers are a revolutionary advancement in concrete reinforcement technology. Comprising micro monofilament polypropylene fibers, these additives are expertly engineered to provide internal reinforcement to concrete. Their primary purpose is to reduce plastic shrinkage cracking, enhance fresh concrete cohesion, improve impact and abrasion resistance, and enhance concrete durability. These fibers come in premeasured, ready-to-use degradable bags, making them incredibly convenient for your construction needs.

Application

Sika® Crackstop 12mm fibers find their application in various construction scenarios, such as:

Slabs

• In slab construction, Sika® Crackstop 12mm fibers help minimize shrinkage cracks, enhancing the integrity of the structure.

Pavements

• For sturdy, long-lasting pavements, these fibers are a key ingredient, ensuring the concrete remains crack-free.

Precast Concrete Products

• In the world of precast concrete, precision and strength are paramount. Sika® Crackstop 12mm fibers play a vital role in ensuring the end product meets these standards.

Heavy-Duty Industrial Floors

• For industrial spaces with high traffic and heavy machinery, these fibers provide much-needed strength and durability.

Overlays

• Whether you’re applying overlays to existing structures or creating decorative surfaces, Sika® Crackstop 12mm fibers are a crucial component to prevent cracks and enhance aesthetics.

Shotcrete

• In shotcrete applications, these fibers make a significant difference in reducing cracking and improving structural integrity.
• It’s important to note that polypropylene fibers are not intended to replace structural steel but serve as a complementary reinforcement.

Advantages

The characteristics and advantages of Sika® Crackstop 12mm are truly remarkable:

• Uniform Distribution: Thanks to their fineness and special surface treatment, these fibers are uniformly distributed within the concrete, offering exceptional reinforcement.
• Reduced Cracking: Sika® Crackstop 12mm effectively reduces plastic shrinkage cracking, preserving the structural integrity of your projects.
• Improved Cohesion: These fibers enhance the cohesion of fresh concrete, resulting in a smoother and more workable mixture.
• Enhanced Durability: With Sika® Crackstop 12mm, your concrete structures are better equipped to withstand impact and abrasion, ensuring long-term durability.

Product Information

Here’s the essential product information you need to know:

• Composition: Micro monofilament polypropylene fibers
• Packaging: 0.6 kg/bag, 28 bags/box (16.8 kg)
• Fiber Count: 180 million fibers/bag
• Shelf Life: 3 years if unopened
• Storage Conditions: Store in a dry environment, protected from direct sunlight
• Density: 225 m²/bag
• Fiber Dimensions: 12 mm in length, 18 microns in diameter
• Tensile Strength: 300 – 400 MPa
• Modulus of Elasticity in Tension: 8000 MPa
• Resistance to Alkalinity: Very high

Technical Specifications

Let’s take a closer look at the technical specifications of Sika® Crackstop 12mm:

Property	Specification
Composition	Polypropylene fibers
Packaging	0.6 kg/bag, 28 bags/box (16.8 kg)
Shelf Life	3 years if unopened
Storage Conditions	Dry condition, protected from direct sunlight
Density	225 m²/bag
Fiber Dimensions	12 mm in length, 18 microns in diameter
Tensile Strength	300 – 400 MPa
Modulus of Elasticity in Tension	8000 MPa
Resistance to Alkalinity	Very high

Construction Instructions

Sika® Crackstop 12mm is an exceptional product designed to reinforce concrete and reduce shrinkage cracking. To maximize the benefits of this innovative solution, follow these detailed construction instructions during your concrete project:

1. Proper Preparation

• Before starting the concrete placement process, ensure that you have all the necessary equipment and materials on hand. This includes the Sika® Crackstop 12mm fibers, concrete mix, tools for mixing, a concrete placement apparatus, curing materials, and personal protective equipment.

2. Calculate the Correct Dosage

• Determine the appropriate dosage of Sika® Crackstop 12mm fibers based on your specific project requirements. The recommended dosage typically ranges between 0.6 to 1.2 kg of fibers per cubic meter of concrete. Refer to the product guidelines or consult with a concrete specialist to ascertain the ideal dosage for your project.

3. Mixing the Concrete

• Begin by mixing the concrete in accordance with your project’s specifications. This may include using various aggregates, cement, water, and any other necessary additives. Ensure the concrete mix is homogeneous and free of any lumps or inconsistencies before proceeding.

4. Adding Sika® Crackstop 12mm Fibers

Once the concrete mix is thoroughly mixed and uniform, it’s time to introduce Sika® Crackstop 12mm fibers. Follow these steps for effective incorporation:

• Open the bags containing the fibers.
• Gradually add the specified quantity of fibers to the concrete mix while it’s still in the mixer.
• Allow the mixer to run for a sufficient duration to ensure even distribution. The fibers should be uniformly dispersed throughout the mixture.

5. Mixing Sika® Crackstop 12mm into the Concrete

It’s crucial to achieve proper dispersion of the fibers. Here’s how to ensure that Sika® Crackstop 12mm is thoroughly mixed into the concrete:

• Allow the mixer to run for an additional 5-7 minutes to ensure an even distribution of the fibers. During this time, the fibers will become an integral part of the concrete mixture.
• Observe the concrete mixture to ensure that the fibers are uniformly distributed and there are no clumps.

6. Placing the Concrete

Now, it’s time to place the concrete with the embedded Sika® Crackstop 12mm fibers. Follow the standard procedures for concrete placement, making sure to:

• Carefully pour the concrete mixture into the desired formwork or onto the designated area.
• Use vibration or other consolidation methods to eliminate air pockets and ensure that the concrete completely fills the formwork.

7. Finishing

• Finish the concrete surface as you would typically do for your project. Depending on your application, this may involve smoothing the surface, adding decorative elements, or achieving a specific texture. The presence of Sika® Crackstop 12mm fibers will not impede the finishing process.

8. Curing

After placement and finishing, the concrete should be appropriately cured to allow it to reach its full strength. Follow curing practices suitable for your project, which may include:

• Applying curing compounds or membranes.
• Covering the concrete with wet burlap, plastic sheeting, or curing blankets.
• Maintaining a moist environment to prevent the concrete from drying too quickly.

9. Enjoy the Benefits

• With Sika® Crackstop 12mm integrated into your concrete project, you can rest assured that the structure is fortified against shrinkage cracking. The enhanced durability and resistance to cracks provided by these fibers ensure a long-lasting and reliable concrete structure.

By following these detailed construction instructions, you can confidently use Sika® Crackstop 12mm to achieve the best results in your concrete projects. Say goodbye to unsightly cracks and hello to a stronger, more resilient concrete future!