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High Alumina Cement
High Alumina Cement (HAC) differs from Portland cement, being composed calcium aluminates rather than calcium silicates. Its rapid strength development made HAC popular from 1950 to 1970. However, mineralogical īconversionī sometimes caused reductions in concrete strength and increased vulnerability to chemical attack. HAC is also known as Calcium Aluminate Cement (CAC).

High Alumina Cement
Acknowledgement: The Concrete Society

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TR46 Calcium aluminate cements in construction- a re-assessment