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The water–cement ratio is the ratio of the weight of water to the weight of cement used in a concrete mix. A lower ratio leads to higher strength and durability, but may make the mix difficult to work with and form. Workability can be resolved with the use of plasticizers or super-plasticizers.Posted on February 3, 2013 by Jeff Girard. Type III cement is a form of portland cement. This article explains Type III cement, but basically, Type III is a high-early-strength cement. It is ground finer and reacts faster than Type I cement, so the early strength gains are greater. Note the word “early”.Aggregate consists of large chunks of material in a concrete mix, generally a coarse gravel or crushed rocks such as limestone, or granite, along with finer materials such as sand. Cement, most commonly Portland cement, is associated with the general term “concrete.” Reinforcement is often included in concrete.Concrete has cement as an ingredient, they are not the same thing. Concrete is made of cement (a very fine powder made from limestone, sand, clay, and iron ore), water, sand and stone. Proportions of these ingredients are crushed and heated in a kiln to form “clinker”.Concrete is a mixture of water, cement, sand just like mortar. However concrete also has gravel and other coarse aggregates that makes it stronger and more durable. Concrete has a low water-to-cement ratio and is a thinner consistency than mortar.43 and 53 are two grades of OPC(Ordinary Portland Cement). Uses: Cement grade indicates the compression strength of the cement concrete after 28 days of setting. 43 Grade Cement attains compression strength of 43 mpa (mega pascals) in 28 days of setting compared to 53 mpa attained by 53 Grade cement.Ordinary Portland Cement (OPC) is the most common cement used in general concrete construction when there is no exposure to sulphates in the soil or groundwater.