Microfine Cement

Microfine cement is a type of cement that has a particle size smaller than 10 microns, which is significantly smaller than the particle size of ordinary Portland cement.

Definition:

Microfine cement is a type of cement that has a particle size smaller than 10 microns, which is significantly smaller than the particle size of ordinary Portland cement. It is a hydraulic binder that is used for soil stabilization, rock grouting, and water sealing.

Uses/benefits:

Microfine cement offers various uses and benefits, including:

Grouting and soil stabilization: Microfine cement is commonly used for grouting applications, particularly in areas with narrow cracks, joints, or fractures. It can penetrate and fill even the smallest voids, providing effective sealing and strengthening of structures especially in tunnel construction. It is also used for soil stabilization, improving the load-bearing capacity of weak or loose soils.
Concrete repairs: Microfine cement is used in concrete repairs to fill and bond cracks, repair damaged concrete surfaces, and restore the structural integrity of deteriorated concrete elements. The fine particles facilitate better adhesion and improved compatibility with existing concrete.
Injection into rock formations: Microfine cement is employed in rock grouting or rock injection applications to improve the stability and sealing of fractured rock formations. It can penetrate the fine fractures, crevices, and voids in the rock, effectively consolidating and strengthening the tunnel structure.
Waterproofing: Due to its ability to penetrate fine cracks and voids, microfine cement is used in waterproofing applications. It can be applied as a coating or injected into cracks, providing an effective barrier against water penetration.

Specifications:

The specifications of microfine cement can vary depending on the manufacturer and specific application requirements. Some common specifications include:

Particle size distribution: Microfine cement typically has a high percentage of particles in the sub-micron range, with a narrow particle size distribution. The specific particle size distribution can affect the flowability, setting time, and penetration capabilities.
Compressive Strength: The compressive strength of microfine cement can range from 10 MPa to 100 MPa.
Setting time: The setting time of microfine cement can be adjusted through the use of specific additives or admixtures. It is important to select a setting time that suits the application requirements.

Types:

There are different types of microfine cement available, depending on the specific formulation and application. Some variations include:

Standard microfine cement: This is the basic type of microfine cement, widely used for grouting, repairs, and stabilization applications. It provides excellent penetration and sealing properties.
Rapid-setting microfine cement: Rapid-setting microfine cement is formulated to achieve faster strength development and setting times, allowing for quicker repair and rehabilitation work.
Sulfate-resistant microfine cement: Sulfate-resistant microfine cement is designed to provide increased resistance against sulfate attack, making it suitable for applications in aggressive environments or sulfate-rich soils.

Some other types include:

Type I: Ordinary microfine cement with a particle size of less than 10 microns.
Type II: Modified microfine cement with added chemical admixtures to improve its performance.
Type III: Rapid-setting microfine cement that can achieve high strength in a short period of time.