![](https://podholding.co/wp-content/uploads/2017/06/type5.jpg)
This type of cement has good strength against sulfate attacks; it is suitable for places where soil and underground water is high in sulfate. It is a chemical reaction between the hydration products of C3A and sulfate ions that enter the concrete from the outside environment. The products generated by this reaction have a larger volume than the reactants, and this creates stresses which force the concrete to expand and crack.