Slag Portland cement, also known as slag cement and designated as P·S, is a type of hydraulic cementitious material composed of Portland cement clinker, 20 to 70% granulated blast furnace slag, and an appropriate amount of gypsum. This combination gives it unique properties that make it suitable for a wide range of construction applications.
According to Chinese standards, the proportion of granulated blast furnace slag in the cement should be between 20% and 70% by weight. Additional materials such as volcanic ash, fly ash, limestone, and kiln dust are permitted, but their total quantity should not exceed one-third of the total blending materials. These can partially replace the slag, with limits of up to 15%, 10%, and 8% respectively. It's also allowed to use volcanic ash and limestone, or combine them with kiln dust to replace slag, but the overall substitution should not exceed 15%. Among these, limestone should not go beyond 10%, and kiln dust should not exceed 8%. After any substitution, the remaining granulated blast furnace slag must still be at least 20%.
Slag cement is currently the most widely used type of cement in China, available in six grades: 32.5, 32.5R, 42.5, 42.5R, 52.5, and 52.5R. Compared to ordinary Portland cement, slag cement has a lighter color, lower specific gravity, and produces less heat during hydration. It also offers better resistance to corrosion and high temperatures. However, it tends to bleed more, has lower early strength, and poorer frost resistance. On the positive side, its late strength increases more significantly over time, which means it requires a longer curing period.
This type of cement is ideal for various concrete projects, including those on the ground, underground, and underwater. It is also commonly used in the construction of high-temperature workshops. However, it is not recommended for projects that require high early strength or are exposed to freeze-thaw cycles or alternating wet and dry conditions.
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