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Aluminate cement
Main business：Building, infrastructure, industrial, mining, marine engineering, military engineering, expressway, tunnel, bridge, concrete repair, installation of large-scale mechanical equipment, wind power equipment, foundation bolt fixing, etc. High-performance, early-strength, micro-expansion, self-compacting, large-flow leveling, rapid repair cement grouting material
- Commodity name： Aluminate cement
- Description
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Packaging Information
Specifications Length (cm) Width (cm) Height (cm) Volume (m³) Weight (kg/bag) Price (USD/ton) 25 kg/bag 60 40 15 0.036 25 1250 Product Introduction
Aluminate cement is a special type of cement whose main mineral component is calcium aluminate. Its performance characteristics and application scenarios are as follows:
Performance characteristics
● Rapid hardening and early strength:
Its 1-day strength can reach over 70% of the 28-day strength of ordinary cement, and its 3-day strength essentially reaches its peak (for example, CA-50 cement achieves a compressive strength of ≥40 MPa after just 1 day), making it ideal for emergency construction.
● Outstanding high-temperature resistance:
At high temperatures (300℃–1200℃), the material maintains stable strength, and its strength even further improves due to the sintering effect, making it suitable for refractory applications.
● Concentrated heat of hydration:
In the early stage (days 1–3), hydration heat accounts for over 90%, and the heat release is rapid. When constructing in low-temperature environments, this heat can be utilized to prevent freezing. However, in large-volume projects, temperature differences may easily lead to cracking.
● Strong resistance to sulfate attack:
The hydration products are not easily decomposed by sulfates, making them suitable for environments subjected to erosion by seawater and salts.
● Low alkalinity:
After hydration, the pH value is approximately 10–11, which can help reduce alkali-aggregate reactions and exhibits superior stability when in contact with acidic media compared to ordinary cement.
● Poor weather resistance:
Prolonged exposure to a hot and humid environment will gradually reduce its strength (“late-stage strength degradation”), making it unsuitable for long-term load-bearing structures.
Application scenarios
● Fire-resistant engineering:
Fire-resistant concrete and fire-resistant mortar (such as furnace linings and blast furnace foundations) can maintain structural stability in high-temperature environments.
Refractory castables are formulated with refractory aggregates (such as corundum and mullite) and are used in heat treatment furnaces, glass melting furnaces, and similar applications.
● Emergency Repairs and Low-Temperature Construction:
In winter (temperatures above -10℃), concrete works can achieve rapid hardening without steam curing; emergency repairs on roads and bridges can be completed within 24 hours, allowing them to resume use promptly.
Rapid sealing of underground engineering projects, leveraging early-strength properties to shorten the water-stop duration.
● Sulfate-resistant and corrosion-resistant engineering:
Concrete structures in harbor and saline soil areas (such as docks and pile foundations), or equipment foundations in chemical workshops subjected to sulfate corrosion.
Wastewater treatment plants, pipelines and structures in contact with acidic media.
● Special Buildings and Materials:
Manufacture expansive cement and self-stressing cement (combined with gypsum) for use in waterproof pipelines or shrinkage-compensating concrete.
Prepare high-strength, wear-resistant repair mortars (e.g., for airport runways and industrial flooring) or composite them with polymers to enhance toughness.
● Other fields:
The construction of rapidly concealed fortifications in military engineering, or mold materials for specialized processes (such as high-temperature-resistant molds used in casting).
The core advantages of aluminous cement lie in its "early strength" and "high-temperature resistance." However, it’s important to note its characteristic of experiencing a decline in later-stage strength. Therefore, aluminous cement is primarily used in short-term load-bearing applications, high-temperature environments, or corrosion-resistant projects, rather than in long-term exposed civil constructions. When using aluminous cement, it’s crucial to strictly avoid mixing it with silicate cement, as differences in alkalinity could lead to performance degradation.
Technical indicators
Aluminate cement for refractory materials
CA50 SeriesCA50-II(G6) CA50-III(G7) CA50(N) CA50-IV(G9) CA50 (Electrofusion) Refractoriness (℃) 1420–1460 1420–1460 1420–1460 1420–1460 1420–1460 Al 2 O 3(%) ≥50 ≥50 ≥50 ≥51 ≥51 CaO(%) ≥33.0 ≥33.0 ≥34.0 ≥33.5 ≤38 SiO 2(%) ≤9.0 ≤9.0 ≤7.0 ≤6.5 ≤6.0 Fe 2 O 3 (6%) ≤3.0 ≤3.0 ≤2.5 ≤2.5 ≤2.5 Alkali content (%6) ≤0.5 ≤0.5 ≤0.5 ≤0.5 ≤0.5 Residue on 325-mesh sieve (%) <20 <20 <10 <8 <12 Specific surface area (BET method) m²/kg ≥300 ≥300 ≥350 ≥400 ≥400 Initial setting time (min) ≥30 ≥30 ≥30 ≥90 ≥120 Final setting time (min) ≤360 ≤360 ≤360 ≤360 ≤480 6-8 hours flexural strength (MPa) - - ≥4.0 - ≥4.5 24-hour flexural strength (MPa) ≥6.5 ≥7.5 ≥7.5 ≥8.5 ≥10.0 72-hour flexural strength (MPa) ≥7.5 ≥8.5 ≥8.5 ≥9.5 ≥11.0 6-8 hours of compressive strength (MPa) - - ≥30.0 - ≥35.0 24-hour compressive strength (MPa) ≥50.0 ≥60.0 ≥60.0 ≥70.0 ≥75.0 72-hour compressive strength (MPa) ≥60.0 ≥70.0 ≥70.0 ≥80.0 ≥80.0 Construction scene
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