Characteristics and Applications of Aluminate Cement
Release time: 2025-04-16
Aluminate cement is a special type of cement made by calcining bauxite and limestone as raw materials.
Aluminate cement is a special type of cement made by calcining bauxite and limestone as raw materials. Its core component is calcium aluminate, which contains about 50% alumina and is ground into a hydraulic cementitious material. This type of cement usually appears yellow brown, and sometimes gray can also be seen. Its key mineral components include calcium aluminate (CaO · Al2O3, abbreviated as CA) and other aluminum salts, as well as a small amount of dicalcium silicate (2CaO · SiO2), which make the color of cement mainly gray and white.
Aluminate cement, also known as alumina cement, mainly consists of bauxite and limestone as raw materials. After calcination, this cement forms a core component mainly composed of calcium aluminate, while containing about 50% alumina. After fine grinding, aluminate cement exhibits water hardness and becomes an important cementitious material. This type of cement usually appears yellow brown, and sometimes may also appear gray. Its key mineral components include calcium aluminate (CaO · Al2O3, abbreviated as CA) and other aluminum salts, as well as a small amount of dicalcium silicate (2CaO · SiO2), which together give the cement the main colors of gray and white.
Aluminate cement has a density and bulk density similar to ordinary Portland cement. According to the national standard (GB201-2000), its fineness needs to reach a specific surface area of ≥ 300m2/kg or a 45 μ m sieve residue of ≤ 20%. Aluminate cement is mainly divided into four types: CA-50, CA-60, CA-70, and CA-80. Each type of cement must meet the standard requirements in terms of setting time and strength at various ages.
Aluminate cement contains three types: calcium aluminate, barium aluminate, and barium zirconium aluminate. Among them, barium aluminate cement is famous for its fast hardening, high strength, and high refractoriness. This type of cement performs well during the hardening process, with a strength of over 80% of the total strength in one day. It is very suitable for projects with tight schedules, such as national defense, roads, and special repairs.
In addition, aluminate cement also has the characteristics of high hydration heat, concentrated heat release, strong resistance to sulfate corrosion, and high heat resistance. Under hardening conditions, due to the absence of tricalcium aluminate and calcium hydroxide in cement paste and its high density, it has strong resistance to sulfate corrosion. Meanwhile, the use of refractory coarse and fine aggregates can produce heat-resistant concrete with a service temperature of up to 1300-1400 ℃.
However, aluminate cement also has some shortcomings. Due to a decreasing trend in long-term strength and other performance, approximately 40% to 50%, it is not suitable for long-term load-bearing structures or engineering in high temperature and high humidity environments. It is more suitable for emergency military engineering, repair engineering, temporary engineering, and the preparation of heat-resistant concrete.
It is worth noting that when aluminate cement is mixed with Portland cement or lime, it will produce flash setting phenomenon and generate highly alkaline hydrated calcium aluminate, which can cause concrete cracking or even damage. Therefore, during the construction process, mixing with lime or Portland cement should be avoided, and it should not be used in contact with uncured Portland cement.
Product Overview
CA80 aluminate cement, with its high alumina content (about 80%), becomes a hydraulic binder. This product series has excellent mechanical properties and high temperature stability, thanks to the careful ratio of CA phase (calcium aluminate) and CA2 phase (dicalcium aluminate). Therefore, it is particularly suitable for high-temperature environments, such as those with temperatures exceeding 1400 ℃, as well as applications that come into direct contact with molten metals.
CA80 aluminate cement does not contain any additives, demonstrating excellent adaptability and compatibility. This makes it an ideal choice for amorphous refractory materials with strict technical requirements, such as low cement castables (LCC) and ultra-low cement castables (ULCC), and suitable for multiple construction methods.
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