High-Strength Coarse Aggregate Cement Grout

High-Strength Coarse Aggregate Cement Grout

GL850

High-Performance Non-Shrink Ready-Mix Grout for Large-Scale Applications

Description of High-Strength Coarse Cement Grout

What is High-Strength Coarse Cement Grout?

High-strength coarse cement grout plays a critical role in the strength of grout and concrete, where the size, type, and shape of the aggregates are crucial. If aggregates with high impurity levels or extremely fine particles such as dust are used in producing mortar or concrete, it will significantly affect the mortar’s strength, reducing its compressive, bending, and tensile strength. In the case of this grout, the size and type of aggregate are essential to the grout’s quality and strength, impacting its durability as well. Coarse grout is made from carefully controlled aggregate sizes, making it one of the strongest cement-based grouts compared to others. It incorporates aggregates with sizes ranging from 5 to 10 millimeters, which enhances compressive and bending strengths over other cement grouts. This type of grout is most commonly used for large-scale grouting projects, where strength is a critical factor. Due to the size and type of aggregate, and the absence of very fine particles, the grout provides excellent resistance after curing. This grout is especially suitable for grouting in low reinforcement areas. High-strength coarse cement grout contains cement, aggregates (silica) up to a maximum size of 10 millimeters, powder superplasticizers, polypropylene fibers, and expansion agents (anti-shrinkage). This combination creates a resilient and robust mortar ideal for grouting under baseplates, large-scale sections, and heavy industrial machinery. It also helps protect reinforcing bars from corrosion.

Mechanism of High-Strength Coarse Cement Grout

What is the effect mechanism of high-strength coarse grout?

The high-strength coarse cement grout consists of cement, silica (aggregate) with a maximum aggregate size of 10 millimeters, powder superplasticizers, polypropylene fibers, and expansion agents, each contributing to improving the grout’s properties in both its fresh and hardened states. The carefully graded aggregates allow the mortar to be uniform, without fine particles, resulting in a strong and cohesive mixture. The powder superplasticizers reduce the grout’s water requirement for mixing, helping it maintain its flowability under baseplates. This also increases the grout’s compressive strength and other mechanical properties. Polypropylene fibers increase the grout’s abrasion resistance and prevent cracking. Moreover, expansion agents counteract shrinkage and cracking by controlling the grout’s expansion, addressing the main drawback of regular mortars, which is shrinkage and cracking due to water evaporation.

Properties and Effects of High-Strength Coarse Cement Grout

What are the properties and effects of high-strength coarse cement grout?

• Achieves early strength without the need for accelerators.
• High resistance to freeze-thaw cycles and temperature variations.
• Excellent load-bearing capacity under deformation forces.
• Protection of reinforcement bars from corrosion.
• High tensile and bending strengths.
• Reduced permeability compared to standard mortars.
• Achieves early and final compressive strength quickly.
• Does not require additional superplasticizers for desired flowability.
• Shrinkage control through gas expansion.
• No cracking after curing.
• Faster usability due to controlled free expansion.
• No cracking due to shrinkage.
• Suitable for exposure to weather changes.
• Increases workability time while achieving 75 MPa compressive strength.

Applications of High-Strength Coarse Cement Grout

Where can high-strength coarse cement grout be applied?

• Suitable for the installation and stabilization of pre-cast columns and walls.
• Ideal for grouting bridge bases and filling gaps between columns and bridge decks.
• For machinery foundations such as generators, turbines, compressors, and diesel engines.
• Installation and stabilization of anchor bolts and fence bases.
• Suitable for heavy industrial machinery installations.
• Can be used as a high-performance ready-mix mortar for general construction.
• Ideal for grouting around water pipes through concrete walls as a waterproof mortar.
• Can replace mortar or concrete in many applications.
• Filling gaps between column plates and foundations in low-reinforcement sections.

Physical and Chemical Properties of High-Strength Coarse Cement Grout

What are the physical and chemical properties of high-strength coarse cement grout?

Attribute	Feature
State	Powder
Color	Gray
Specific Gravity	3.2 g/cm³
Chloride Ion	None

Standards for High-Strength Coarse Cement Grout

High-strength coarse cement grout complies with which standards?

• ASTM C476
• ASTM 942

Consumption Rate of High-Strength Coarse Cement Grout

What is the correct consumption rate of high-strength coarse cement grout?

The consumption rate of high-strength coarse cement grout depends on the structure’s volume and the desired consistency (fluid or paste). Generally, approximately 2400 kg per cubic meter of volume is required. A 25 kg bag of coarse cement grout typically fills around 13 liters of space.

Application Method for High-Strength Coarse Cement Grout

How is high-strength coarse cement grout applied?

1. Ensure the plates are properly placed and leveled using a level tool.
2. Grouting should only be done on surfaces that are at least 7 days old.
3. Ensure the gap between surfaces is at least 15 millimeters.
4. Clean the contact surfaces to remove any debris, oils, or contaminants.
5. Check the formwork to ensure it prevents water leakage.
6. The grout should be placed uniformly and continuously from one side to ensure even distribution.
7. Use a metal bar or chain to aid in spreading the grout.
8. Apply curing immediately after grouting.

Safety of High-Strength Coarse Cement Grout

What safety precautions should be followed when using high-strength coarse cement grout?

• In case of accidental ingestion, seek medical attention immediately.
• Coarse cement grout is not classified as toxic or hazardous to the environment.
• In case of contact with skin or eyes, rinse with clean water.
• Avoid direct inhalation during mixing.

Storage of High-Strength Coarse Cement Grout

How should high-strength coarse cement grout be stored?

• Duration: 1 year in its original packaging.
• Conditions: Store in a dry place, away from frost, heat, and direct sunlight.
• Ideal Temperature: 10°C to 30°C.

Packaging of High-Strength Coarse Cement Grout

How is high-strength coarse cement grout packaged?

• 25 kg bags.

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