Ordinary portland cement and its composition

Ordinary portland cement and its composition Cement, commonly used for normal construction work, is known as Ordinary Portland Cement. However, for use under specific conditions a variety of Ordinary portland cement and its composition are available these days. Its quick setting property, strength and case with which it can be used under variety of conditions has revolutionized the concept of construction and made it the most popular cementing material. It was first of all introduced in 1824 by Joseph Aspdin, a brick layer of Leeds, England. On setting, the colour of cement resembles the colour of rocks near Portland in England and hence the name of this cement. Below are discussed the composition, manufacture and tests etc. of Ordinary Portland Cement. 2.      COMPOSITION Approximate composition of raw materials used for manufacturing Ordinary Portland Cement is : Calcium Oxide (CaO)                      = 60 to 65% Silica (S1O2)                                      = 20 to 25% Aluminium…

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Tests for  burnt clay bricks as per IS : 3495-1976

In this article Learn: tests for burnt clay bricks as per is:3495-1976,test for compressive strength,test for water absorption,Test for efflorescence.  Tests for  burnt clay bricks as per is : 3495-1976  tests for  burnt clay bricks as per is : 3495-1976. are described below:             1. Test for compressive strength. According to Tests for  burnt clay bricks as per IS : 3495-1976, Grind the two bed faces to provide smooth, even and parallel faces. Immerse the specimen in water at room temperature. Remove the specimen from water after 24 hours and drain out any surplus water at room temperature. Fill up flush the frog and all voids with cement mortar (1part cement and 1 part clean coarse sand of grade 3 mm and down), store under damp jute bags for 24 hours and then immerse in clean water for 3 days. Remove and wipe out any traces of moisture. Place the specimen between two…

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