This book focused on the initial surface absorption behavior of cement system modified with polymer and pozzolan in direct relation to mortar durability. Polymer additive namely Styrene Butadiene Rubber (SBR) and Styrene Acrylic Ester (SAE), as well as pozzolan additive namely Fly Ash (FA) and Silica Fume (SF) with different percentages of addition were used as a composite of OPC mortar with w/c ratio ranging from 0.3 to 0.5. Results showed that specimens with w/c of 0.5 absorbed the least water. It also showed that non-modified OPC mortar specimens absorbed more water compared to the...