Description of High Alumina Cement
High alumina cement (formerly known as bauxite cement) is a hydraulic cementitious material with aluminate as the main mineral component, which is prepared by bauxite and lime in a certain proportion, calcined and ground, also known as aluminate cement. It exhibits exceptional refractory properties, including high-temperature resistance, excellent thermal shock resistance, and low shrinkage at elevated temperatures. This cement is specifically designed for applications in high-temperature environments such as furnace linings, kiln linings, and other refractory installations. It offers rapid setting and hardening, achieving high early strength, and demonstrates good resistance to chemical attack, making it suitable for acidic environments.
Kerui High Alumina Cement Technique Data
| 项目/等级 | CA50 | CA70 | CA80 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|
| A600 | A700 | A900 | CA70 | CA70W | CA70S | CA71 | CA80 | CA80S | |||
| Chemical Composition | ω (SiO2) ≤/% | 7.8 | 7.5 | 5.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | 0.5 | |
| ω (Al2O3)/% | 50.0 | 51.0 | 53.5 | 68.5-70.5 | 68.5-70.5 | 68.5-70.5 | 69.5-71.5 | 78.0-81.0 | 78.0-81.0 | ||
| ω (Fe2O3) ≤/% | 2.5 | 2.5 | 2.5 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | 0.2 | ||
| ω (CaO)/% | / | / | / | 28.5-30.5 | 28.5-30.5 | 28.5-30.5 | 27.5-29.5 | 17.5-20.5 | 17.5-20.5 | ||
| ω (MgO) ≤/% | / | / | / | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (R2O) ≤/% | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | 0.4 | ||
| ω (S) ≤/% | 0.1 | 0.1 | 0.1 | / | / | / | / | / | / | ||
| ω (Cl) ≤/% | 0.1 | 0.1 | 0.1 | / | / | / | / | / | / | ||
| Fineness | d50/μm | / | / | / | 11-4 | 8-11 | 6-9 | 10-13 | 5-8 | 5-8 | |
| -45μm ≤/% | / | / | / | 8.0 | 5.0 | 5.0 | 8.0 | 5.0 | 5.0 | ||
| Setting Time | Initial Setting Time (min) | ≥45 | ≥60 | ≥90 | 120-180 | 30-90 | 180-240 | 150-210 | 30-90 | 90-150 | |
| Final Setting Time (min) | ≤360 | ≤360 | ≤360 | 150-240 | 90-180 | 240-330 | 210-300 | 90-180 | 270-360 | ||
| Strength (ISO) | Flexural Strength/Mpa | 24h | 6.0 | 6.5 | 8.0 | 7.5-10.0 | 8.0-10.5 | 8.0-10.5 | 8.5-11.0 | 5.0-7.5 | 5.0-7.5 |
| 72h | 7.0 | 7.5 | 10.0 | 10.0-12.0 | 10.5-12.5 | 10.5-12.5 | 11.0-12.5 | 6.0-8.5 | 6.0-8.5 | ||
| Compressive Strength/Mpa | 24h | 45 | 55 | 72 | 40-50 | 45-55 | 45-55 | 50-60 | 30-40 | 30-40 | |
| 72h | 55 | 65 | 82 | 45-55 | 50-60 | 50-60 | 55-65 | 40-50 | 40-50 | ||
| 325M ≤/% | 15 | 12 | 8 | / | / | / | / | / | / | ||
| Specific Surface Areas ≥/ (㎡/kg) | 300 | 320 | 350 | / | / | / | / | / | / | ||
Advantages of High Alumina Cement
Large Heat of Hydration
Early cement hardening releases a lot of heat. Compared with Portland cement of the same grade, it can release 70-80% of the total heat of hydration in only one day. Due to several heat releases, it is suitable for concrete works with low-temperature curing. As the best supplier in China, Kerui can provide customers with the highest quality products.
Strong Resistance to Sulfate Erosion
The cement stone structure of high alumina cement is dense, the main component is low calcium aluminate, and the content of calcium oxide is very small. During the hydration process, free calcium hydroxide is not precipitated but aluminum hydroxide gel is formed. A protective film is formed on the particle surface.
Good High-Temperature Resistance
It will always maintain a solid state in a high-temperature environment, and the strength of the cement will not change. High alumina cement can be used as a cementing material for heat-resistant concrete and configured into heat-resistant concrete. Welcome to visit Kerui factory to get free quotation.
Early Strength Characteristics
Its early strength increase rate is far higher than that of rapid hardening Portland cement, which is suitable for emergency repair projects, but its strength will decrease later, and its use in structural engineering is limited. Kerui will provide you with professional solutions and high-quality products.
CERTIFICATES OF KERUI REFRACTORY
Kerui Group has a number of international certifications, such as, ISO9001/ISO14001/OHSAS18001/CE/SGS. Besides, Kerui’s products also have many domestic certificates, the quality is very guaranteed, and they have been unanimously recognized by customers at home and abroad.
Application of High Alumina Cement
Laboratory of Kerui Refractory
Kerui has a professional quality inspection laboratory. High temperature reheating/load softening creep test furnace;Compressive/flexural strength testing bench for refractory materials; Composition testing and inspection platform for refractory materials; Laboratory for physical/chemical properties for refractory materials.
KERUI REFRACTORY PRDUCTS PACKAGING&SHIPPING
The entire delivery process is tracked, and Kerui’s expert team solves specific project needs with the utmost professionalism. If the customer’s project requires it, Kerui’s expert team will go to the customer’s country to provide face-to-face technical support.
CUSTOMER CASE OF KERUI REFRACTORY
Besides mainland China, Kerui Refractory has exported products to more than 50 countries and regions across 5 continents across the world, including Asia, Europe, America, Africa and Oceania. We have received recognition and high praise from customers all over the world, and are constantly receiving customers’ return orders and referrals.
