High performance cements are used for special purposes in order to eliminate some of the problems encountered in reinforced concrete structures. Calcium aluminate cement, which provides ease of use with its early setting time, is preferred due to its high resistance to groundwater. Sulfate Resistant Cements, Oilwell Cements specially designed for oil wells, and Calcium Sulfoaluminate Cements preferred in areas where rapid repair is required such as bridges and highways can be listed among the high performance cement types.
The cements that we will examine in this article are as follows:
- Calcium Aluminate Cement,
- Sulfate Resistant Cement,
- Oilwell Cement,
- Calcium Sulfoaluminate Cement.
Where to Use High Performance Cement?
Specialized cements and concrete designs are used in concrete structures to eliminate the below-mentioned disadvantages.
- Lack of security under overload,
- Lack of studies related to special applications,
- Lack of durability in long-term use,
- Weakness in terms of sustainability,
- Adverse impacts of concrete structures on the environment,
- High performance cements are preferred when problems are encountered, such as not being able to resist the environmental impacts (seawater, chemical exposure, biogenic corrosion).
What are the Properties of High Performance Cement?
Calcium Aluminate Cement and strength at 24 hours have higher strength properties than Portland cement. These cements have thermal resistance while they are also resistant to acids and sulfates. Chemical compositions of these cements can be adjusted according to customer requirements. Low alumina-high iron, low alumina-low iron and high alumina types are available.
Table 1: CAC Compositions Containing Various Amounts of ‘Al’
Sulfate Resistant Cements are preferred in environments exposed to high sulfate environments such as seawater and sewage. The fact that the C3A phase in the cement is less than 5% provides resistance to sulfate.
While CEM I type sulfate-resistant cements have strengths of 32.5 and 42.5 MPa, strengths of 42.5 and 52.5 MPa are observed in CEM IV/A and CEM IV/B-type sulfate-resistant cements, respectively.
Oilwell Cement prevents fluid movement between layers in oil reserve zones, and supports the metal jacket of the drill pipe while protecting it from corrosion.
Figure 1. Layers in the oil reserve zone
Referred to as A, B, C types API Construction Cement, these cements are similar to Portland cement.
D, E, F types are referred to as API Retarded Cement and are not commonly used today. G, H; J types contain no additives other than calcium sulfate and water, and the most common type is G type.
Table 2. Physical Properties of Oilwell Cements
Table 3. Chemical Properties of Oilwell Cements
White Portland Cement is a high-performance cement with rapid setting, high early strength, aesthetic appearance, as well as durability advantage, resistance to alkali-silica reactions and long service life.
Image 1: Çimsa High Performance Cement
What are the Advantages of High Performance Cement?
Apart from the general areas of use for Portland cement, high performance cements are preferred in areas where sulfate exposure is common, in structures that require rapid repair, for reasons such as protection of drill pipes during oil extraction, and to get cleaner products, or according to the different mechanical and chemical requirements of the project to be carried out.
Frequently Asked Questions
What are high performance cements used for?
High performance cements are used for special purposes to eliminate problems encountered in reinforced concrete structures, such as lack of security under overload, lack of long-term durability, weakness in sustainability and adverse environmental impacts. They are preferred when concrete cannot resist environmental effects such as seawater, chemical exposure or biogenic corrosion.
What are the main types of high performance cement?
The main types are Calcium Aluminate Cement, Sulfate Resistant Cement, Oilwell Cement and Calcium Sulfoaluminate Cement. Calcium aluminate cement provides early setting and high resistance to groundwater, sulfate resistant cements suit seawater and sewage environments, oilwell cements are designed for oil wells, and calcium sulfoaluminate cements are preferred for rapid repair of bridges and highways.
How does sulfate resistant cement provide resistance to sulfates?
Sulfate resistant cements owe their durability to a C3A phase content of less than 5% in the cement. They are preferred in environments exposed to high sulfate levels such as seawater and sewage. CEM I type sulfate-resistant cements have strengths of 32.5 and 42.5 MPa, while CEM IV/A and CEM IV/B types reach 42.5 and 52.5 MPa respectively.
What is oilwell cement and which type is most common?
Oilwell cement prevents fluid movement between layers in oil reserve zones and supports the metal jacket of the drill pipe while protecting it from corrosion. A, B and C types are API Construction Cements similar to Portland cement, while D, E and F retarded types are rarely used today. Among G, H and J types, G type is the most common.
References:
Sibel Kurt Sönmez
Marketing Executive, Çimsa
She works on the development and positioning of white cement and calcium aluminate cement (CAC) solutions across global markets. At Çimsa Blog, she writes technical and industry-focused content on specialty cements, advanced building materials, and innovative construction solutions.
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