Influence of using slag cement on the microstructure and durability related properties of cement grouts for micropiles

► Microstructure and durability of OPC and slag cement grouts used for micropiles. ► Hardened slag cement grouts have a more refined microstructure than OPC ones. ► The use of slag cement grouts produces an improvement of micropiles durability. ► The w:c ratio of the cement grout does not influence on their long-term properties. ► The slag cement grouts for micropiles show good properties, better than OPC ones.