Suitability of various types of cement: Selection of cement based on suitability for various concreting environment is important for durability considerations of structures. Thus, making wise choice of cement type for particular construction site, prevents structure from deteriorating and saves much repair and rehabilitation cost later. Following are the suitability of various cements for different(…)
Cement
SETTING PROCESS OF CEMENT
When water is mixed with cement to form a paste, reaction starts. In its pure form, the finely ground cement is extremely sensitive to water. Out of the three main compounds, viz. C3A, C3S and C2S, reacts quickly with water to produce a jelly-like compound which starts solidifying . The action of changing from a(…)
FUNCTIONS OF INGREDIENTS OF CEMENT (OPC)
Functions Of Ingredients of Cement (OPC): The ingredients of ordinary cement, as mentioned above, perform the following functions: Lime (CaO): This is the important ingredient of cement and I s proportion is to be carefully maintained. The lime in excess makes the cement unsound and causes the cement to expand and disintegrate. On the other(…)
FIELD TESTS ON CEMENT
Field tests on cements are carried to know the quality of cement supplied at site. It gives some idea about cement quality based on colour, touch and feel and other tests. The following are the field tests on cement: (a) The colour of the cement should be uniform. It should be grey colour with a(…)
RAPID HARDENING CEMENT–ADVANTAGES AND USES
Rapid Hardening Portland Cement (RHPC) Rapid hardening cement is similar to Ordinary Portland cement but with higher tri-calcium silicate (C3S) content and finer grinding. It gains strength more quickly than OPC, though the final strength is only slightly higher. This type of cement is also called as High-Early Strength Portland Cement. The one-day strength of(…)
CHEMICAL AND PHYSICAL REQUIREMENT OF CEMENT
Cement is defined as the product manufactured by burning and crushing to powder an intimate and well-proportioned mixture of calcareous and argillaceous materials. The cement, which is generally used for preparing concrete, is the Ordinary Portland Cement. But for special purposes other qualities of cement such as Low Heat Cement, Rapid Hardening Cement, High Alumina(…)
TYPES OF CEMENT AND THEIR USES
TYPES OF CEMENT, ITS COMPOSITION AND USES The following are the types of cement that are in practice: 1. Rapid Hardening Cement 2. Quick setting cement 3. Low Heat Cement 4. Sulphates resisting cement 5. Blast Furnace Slag Cement 6. High Alumina Cement 7. White Cement 8. Coloured cement 9. Pozzolanic Cement 10. Air Entraining(…)
COMPOSITION OF PORTLAND CEMENT
COMPOSITION OF PORTLAND CEMENT The principle raw materials used in the manufacture of cement are: a) Argillaceous or silicates of alumina in the form of clays and shales. b) Calcareous or calcium carbonate, in the form of lime stone, chalk and marl which is a mixture of clay and calcium carbonate. The ingredients are mixed(…)