4.10 : セメントのタイプII

Intergrinding Portland cement clinker with granulated blast-furnace slag, a by-product of the iron-making process, produces slag cement.

It can be used to construct large structures designed to resist the attack of chlorides and sulfates.

White cement, made from chalk and china clay containing fewer quantities of iron and manganese oxides, has a distinctive white color and can be used to create facades with excellent aesthetics.

Adding colored pigments that are not detrimental to the concrete with white cement produces colored cement.

Expansive cements, such as Types K, M, and S, are produced by combining Portland cement with an expansive agent and a stabilizer. This prevents shrinkage cracking through controlled expansion due to early ettringite formation during hardening.

Air-entrained Portland cement uses smaller quantities of air-entraining materials to form millions of microscopic air bubbles within the cement matrix.

This provides spaces for water to expand into when it freezes, preventing cracking caused by freeze-thaw cycles.  

Waterproof Portland cement incorporates water-repellent substances, ensuring structures exposed to moisture are protected against water infiltration.