Cylinders Capping
Capping a concrete cylinder means placing a smooth uniform cap/layer at the end of a concrete cylinder to provide for a uniform load distribution when testing. Since the concrete sample will contain voids and aggregate particles at the upper surface that is left open, it is necessary to prepare a smooth uniform surface for the testing machine to press against.
Plaster of Paris (Gypsum) is used as capping material nowadays. Capping of all the concrete cylinders is carried out carefully with the help of capping machine for concrete cylinders, as shown in Figure 10.
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