Comparative Analysis Of Portland Cement In Southwestern Nigerian

Project and Seminar Materials for Civil Engineering CE

Chapter One

Introduction

Ordinary Portland Cement (O. P. C): a substance which binds together the particles of aggregates (usually sand and gravel) to form a mass of high compressive strength concrete. It is a combination of limestone or chalk with clay mixed in a proportion depending on the type of cement desired. Portland cement is the most common type of cement generally used around the world because it is a basic ingredient of concrete, mortar, stucco e.t.c. if a fine powder is produced by grinding Portland cement clinker more than 90 %, a limited amount of calcium sulphate shall consist of at least two-thirds by mass of calcium silicates (3CaO.SiO2). The remainder consisting of aluminum and iron-containing clinker phases and other compounds. The ratio of CaO to SiO2 shall not be less than 2.0. The magnesium oxide content (MgO) shall not exceed 5.0% by mass. Portland cement is the cement that only hardens by reacting with water but also forms a water-resistant product. Produce by pulverizing clinker consisting of one or more of the form of calcium silicates, usually containing one or more of the calcium sulphate (diameter 0.2 – 1.0 inch (5 – 25mm), the low cost and widespread availability of the limestone, shales, and other naturally occurring materials make Portland cement one of the lowest – cost materials widely used over the last century throughout the world. (Wikipedia, the free encyclopedia, 2011).

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