Category: CEMENT MATRIAL

Although cement and lime are cementing materials, they have different features and properties: SALIENT POINTS

The following tests are conducted on cement in the laboratory (IS: 4031 – PT 1 to 15, 1989): 6.9.1 Fineness Test Fineness of cement is responsible for the rate of hydration and rate of evolution of heat and hence on the rate of gain of strength. Finer the grains, more is the surface area and…

At present, Ordinary Portland Cement is available in three different grades in India as 33-grade (IS: 269–1989), 43-Grade (IS: 8112–1989) and 53-grade (IS: 12269–1987). The numbers 33, 43 and 53 correspond to the 28-day compressive strength of cement-mortar as 33 MPa, 43 MPa and 53 MPa. The strengths are obtained from standard tests on cement–sand…

Types of Portland Cement Code (IS: 456:2000) permits the use of the following Portland cement for a specific work: 1. Ordinary Portland Cement (OPC) Ordinary Portland Cement of grades 33, 43 and 53 are permitted. Only these cements are most commonly used in general concrete construction. 2. Rapid Hardening Portland Cement (RHPC) This cement conforms…

The main constituents in the manufacture of cement, as discussed earlier, are lime, silica, alumina and iron oxide (Table 6.1). These oxides interact with one another in the kiln at a high temperature, and more complex compounds are formed. The relative proportions of these oxides are fully responsible for the various properties of cement, rate…

Cement factories are to be set up in areas where raw materials, viz., limestone or chalk and shale or clay are abundantly available. It should have adequate transport facilities like road, rail, etc., for easy transport of the finished products. Further, adequate water and power should be available to run the industry without any interruption…

Ordinary Portland Cement should possess certain physical and chemical properties for the best performance when it is used in a structure. Further, it is possible to compare the quality of cement from different sources for proper selection. Frequent tests are to be carried out on the cement directly, on hardened cement paste or continuous on…

The main ingredients in the manufacturing of cement are lime, silica, alumina and other oxides. The ingredients present in Ordinary Portland Cement are given in Table 6.1. The contributions by different ingredients are discussed below. Table 6.1 Ingredients of Portland cement Lime It is the main constituent which contributes to the strength. Its proportion has to…

Among the binding materials, cement is of recent origin compared to those used in the construction of different monuments throughout the world. Undoubtedly the credit goes to John Smeaton, a British Engineer, in the year 1756, who was given the responsibility of rebuilding the Eddystone lighthouse. Based on an exhaustive collection of information about the…