We shape building, Therefore they shape us”
~Winston Churchill
As cement is one of the common materials used in construction works, it plays a vital role when it comes to deciding the quality of cement used. The type of cement completely depends upon the strength and durability of the structure. The housing sector is the largest consumer of cement in India.
India uses 65% of cement and also is the 2nd largest producer of cement all over the world. Due to the growing need for the conservation of water, we need to take care of the amount of water used for mixing and curing the cement.
While selecting the type of cement we must consider the following :
1. Type of the project
2. Location of the project
3. Suitable source of water for curing
TYPES OF CEMENT :
1.OPC (Ordinary Portland Cement)
OPC has been the most common type of cement used for years due to its abundance and low production cost. OPC is produced by grinding limestone and secondary materials to fine powder.
OPC usually takes little time for setting, which is important for large scale constructions, thus speeding up the process of determining the length of the construction period.
OPC is available in three grades: OPC 33 Grade, OPC 43 Grade, and OPC 53 Grade.
OPC gains 95% of its strength within the first 7 days only.
OPC is usually costlier than PPC.
Chances of shrinkage cracks are also very high as compared to PPC.
Cannot be used for mass concreting works, masonry mortars and plastering.
2.PPC (Portland Pozzolana Cement)
Average Plaster thickness varies from 10-15 mm for inner plaster and 15-25 mm for outer plaster
Brief Process, Cleaning of Surface Before Applying---- Applying Water----Preliminary coat of cement Slurry (Cement +Water) to fill up the voids in masonry----First Coat of 6-8 mm Applied---- 2nd Coat Applied
.Preparation Before Plastering
Any openings in the form of Electrical or Water Pipes is Closed.
Wire Meshes/Chicken Meshes are applied at all the junctions where cracks may arise.
Bull Marks for Measuring and keeping the plastering thickness uniform are given at proper intervals.
Walls are cured properly before plastering and made wet before plastering, cement slurry and water is also applied.
The mix ratio for plastering is usually 1:6, 1 part Cement for 6 Parts Sand, unless specified otherwise by the site incharge.
For more details, watch this: #BestCement Which Cement is Best for House Construction
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