What are the common types of Portland cement and their uses?

Common Portland cement types include: Type I (Ordinary) for general construction, Type II (Modified) for moderate sulfate resistance, Type III (High Early Strength) for fast-track construction, Type IV (Low Heat) for mass concrete like dams, and Type V (Sulfate Resistant) for exposure to sulfate soils. Selection depends on exposure conditions, strength requirements, heat generation concerns, and construction schedule.