–Mineral Admixture –Ordinary Portland Cement (P.O) –Portland granulated Blast-furnance-slag Cement (P.S) –Portland-Pozzlana Cement (P.P) –Portland fly-ash.

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–Mineral Admixture –Ordinary Portland Cement (P.O) –Portland granulated Blast-furnance-slag Cement (P.S) –Portland-Pozzlana Cement (P.P) –Portland fly-ash cement (P.F) –Composite Portland Cement (P.C) Chapter 3 Cement § 3.3 Portland Cement With Mineral Materials

It refers to the cement which is formed by cement clinker, Portland-Pozzlana mixing materials and a little gypsum Quantities of Pozzlana mixing materials are 20% ～ 50% Clinker Pozzlana mixing materials Gypsum Grinding Hydraulic cementing material cementing material P.P What is Portland-Pozzlana Cement

 Strength is low in the early days and high in the later days.  Strong anti-erosion and poor carbonation resistance  Low anti-freezing  Low hydration heat  Temperature sensitivity Similar points Characteristics

 Impermeability is excellent when cured in humid condition or in water.  Volcanic ash reacts with lime to have the effect of expension and forms calcium silicate hydrate, which densifies the structure of hardening cement paste.  It can easily shrink/powdery when it is in the dry condition.  Because hydration cannot happen in the dry condition and strength keeps stable, calcium silicate hydrate gel can also make cement shrink and form crack. It is not available to the construction in dry area Different points Characteristics