Complete range of mud types and application

Cement is one of the most important building materials, in the form of powder. After mixing with water, it undergoes a physical and chemical process that can produce a plastic paste that turns into a hard stone like body (hardening), and can firmly bond loose materials (adding sand, preparing) together. Cement is a hydraulic cementing material that, when mixed with water, can not only harden in the air, but also harden, maintain, and increase strength in humid environments and water.

According to its use and performance, it can be divided into two types: general cement (cement used in marine and civil construction engineering), special cement (specially selected cement), and special cement (a cement with outstanding performance).

In the general cement category, there are six types of cement: Portland cement, ordinary Portland cement, slag cement, pozzolanic cement, fly ash cement, and composite cement.

1. Portland cement

Main ingredients: It is made by grinding Portland cement clinker with a small amount of limestone or granulated blast furnace slag and appropriate amount of gypsum, and is a hydraulic cementing material.

Advantages: High strength, fast hardening, strong drought resistance, good frost resistance and wear resistance.

Disadvantages: High hydration heat and poor corrosion resistance.

Scope of application: Suitable for preparing high-strength concrete, pre tensioned prestressed products, road and low-temperature construction projects. Not suitable for mass concrete, chemical and seawater erosion projects.

2. Ordinary Portland Cement (Ordinary Cement)

Main ingredients: finely ground from Portland cement clinker plus 6% to 15% mixed materials and an appropriate amount of gypsum, it is the most commonly used hydraulic cementing material.

Advantages: Enhanced sulfate resistance.

Disadvantages: The early strength growth rate has decreased, the frost resistance and wear resistance have slightly decreased, and the low-temperature setting time has been extended. (No fundamental difference compared to Portland cement)

Scope of application: It has strong adaptability and can be used in projects without special requirements.

3. Portland slag cement (abbreviated as slag cement)

Main ingredients: finely ground from Portland cement clinker, granulated blast furnace slag, and appropriate amount of gypsum. It is a hydraulic cementing material, and is the largest cement variety in China.

Advantages: Low hydration heat, good sulfate resistance, good steam curing effect, and higher heat resistance than ordinary silicate cement. Disadvantages: Low early strength, high strength improvement rate in the later stage, poor water retention, and poor frost resistance.

Scope of application: Suitable for various concrete projects on the ground and underground water, as well as high-temperature workshop buildings. It is not suitable for projects that require early strength and freeze-thaw cycles or alternate drying and wetting.

4. Pozzolanic Portland Cement (Pozzolanic Cement for short)

Main ingredients: It is made of silicic acid cement clinker added with pozzolanic mixed materials and a suitable amount of gypsum, and is a hard cementing material.

Advantages: Good water retention, low hydration heat, and strong sulfate resistance.

Disadvantages: Low early strength, but high late strength improvement rate; Large water demand, large dry shrinkage, and poor frost resistance.

Scope of application: Suitable for underground and water engineering, mass concrete engineering, general industrial and civil buildings. It is not suitable for projects requiring early strength, freeze-thaw cycles, or alternate drying and wetting.

5. Portland fly ash cement (referred to as fly ash cement)

Main ingredients: finely ground from silicate clinker, fly ash, and appropriate amount of gypsum, it is a hydraulic cementing material.

Advantages: Good water retention, low hydration heat, strong sulfate resistance, high strength development in the later stage, low water demand and dry shrinkage, and good crack resistance.

Disadvantages: The early strength improvement rate is lower than that of slag cement, which is the same as pozzolanic cement.

Scope of application: Suitable for mass concrete engineering, underground engineering, general industrial and civil buildings. The scope of inapplicability is the same as that of slag cement.

6. Composite Portland Cement (referred to as composite cement)

Main ingredients: It is made of Portland cement clinker and two or more specified mixed materials added with an appropriate amount of gypsum and finely ground, and is a hydraulic cementing material.

Advantages: Compared to slag cement, pozzolanic cement, and fly ash cement, it has higher early strength, better workability, and is easy to form and compact.

Disadvantages: High water demand, and the durability of concrete prepared is not as good as that of concrete prepared with ordinary cement.

Scope of application: Suitable for general concrete engineering and industrial and civil construction engineering. Not suitable for corrosion resistant engineering, self compacting concrete should be used with caution.