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 Many times, the average person uses the terms "cement" and "concrete" interchangeably without realizing that there is a difference. Even when the handyman refers to "cement," there is often a question as to exactly what he means. Before going into the details on mixing and various projects, here is a definition of terms: concrete pavers 1. Portland cement is a manufactured product purchased in sacks that usually contain 1 cubic foot. 2. Cement is a mixture of Portland cement, sand and water. 3. Concrete is a mixture of Portland cement and sand with gravel added to give it strength and bulk, plus water. 4. Mortar is a mixture of Portland cement, sand and water with about 10% hydrated lime added. 5. Grout is a flowing mass of cement or concrete. How Much of Each? For most cement jobs - to set flagstones or patch a house foundation, you need 1 part of Portland cement to 2½'' parts of clean, fine sand. For concrete jobs, the proportion varies dependin