The discussion centers on the comparative analysis of ettringite and calcium hydroxide as hydration products in concrete. Ettringite, with a hardness of 2-2.5, contributes to volume expansion during sulfate attacks, while calcium hydroxide is linked to the overall durability of concrete. The user seeks further information on the hardness of calcium hydroxide, suspecting it to be softer than ettringite. Relevant resources, such as the Cement Association's website, are suggested for further exploration.
PREREQUISITESCivil engineers, concrete technologists, and construction professionals interested in the properties and performance of hydration products in concrete.