Calcium Aluminate Cement — Rapid Set and Refractory Binder

Primary uses

• Rapid strength development
• Chemical and thermal resistance
• Set control in blended systems

Applications

• Rapid-set repair and patching systems
• Self-levelling and building-chemistry formulations
• Refractory castables and linings
• Sewer and chemically exposed concrete

Advantages

• Develops strength far faster than Portland systems, which enables rapid-turnaround repair and production
• Serves refractory and high-temperature applications that Portland cement cannot
• Offers resistance to certain chemical and sulfate exposures where Portland systems degrade

Limitations to consider

• Long-term strength behaviour follows different rules from Portland cement and must be designed for explicitly
• Cannot be casually blended with Portland cement — uncontrolled mixtures cause flash set and unpredictable results
• Performance is composition-specific and is declared by the producer for the exact cement offered
• Where the finished element goes into a building, the performance that matters is the performance of your element under the applicable code and project specification, not the property of a single ingredient. Testing and conformity evidence for the finished product are the responsibility of the producer and are established by project-specific testing.
• Mix ratio, pot life, working time, demould time, full-cure schedule, hardness, tear strength, elongation, shrinkage, viscosity and temperature resistance are properties of one specific supplier system. They are never quoted here from memory or by analogy with a similar product; they are read from the supplier data sheet for the exact material offered and confirmed at quotation.

How to choose the right grade

• Start from the element being produced and the specification it has to satisfy, because binder, aggregate and admixture choices are decided together rather than one at a time
• State the placing method — poured, vibrated, sprayed or pressed — since rheology requirements follow from it
• Describe the curing regime and the plant conditions, including whether production continues through a Canadian winter
• State whether the driver is rapid strength, refractory service or chemical resistance, since those go to different products
• Confirm the design rules with the producer rather than transferring Portland mix practice
• Mould-making and casting behaviour depends on the pattern, the shop temperature and humidity, the mixing method and the operator. A production-representative trial on your own pattern and in your own shop conditions is the only honest way to qualify a material before a run is committed.
• Exact specification is confirmed against supplier documentation at quotation.

Typical grades

• Products the producer classifies by alumina content and intended service
• Refractory and construction-service products as designated by the producer
• Buyers search this category by grade name, and those names describe what the workshop needs rather than what is asserted here. Which grade a specific offer corresponds to, and what the supplier declares for it, is read from the technical documentation issued for the exact material quoted.
• Materials in this category interact: rubbers, releases, sealers, resins, pigments and fillers can inhibit cure, stain a surface or shorten mould life when they are combined outside the combinations the supplier has tested. State every material already in the process at enquiry so compatibility is checked against supplier documentation rather than discovered on the shop floor.
• Reactive materials age in the container, and moisture-sensitive systems age faster once opened. Order against real consumption rather than against a discount, and confirm the shelf life the supplier states for the exact product and pack.