Why is gypsum added to cement?

The walls around you contain tons of chemicals and other elements which help to make it stronger and durable. Unless you are a civil engineer, you will be amazed to see the number of materials that is included in creating a wall starting from the bricks used to the painting done. Plastering of the wall using cement is one of the stages in the construction process. An important ingredient in preparing the cement mixture is Gypsum.


The material:

Gypsum is the material which is responsible for regulating the setting time of cement and because of the same reason gypsum is a very important factor when it comes to cement mixing. The consistency of the cement needs to be perfect, and it has to set properly when applied on the wall. Gypsum is responsible to make sure that the cement stays and hardens once it is plastered on the wall.

How to use it?

The quantity of gypsum used must be accurate. If too much of gypsum is used then, the cement will set too fast without giving time to apply it on the wall. This is because the gypsum can create a clotting agent in itself. If a little amount of gypsum is used, it will prevent the retardation of the cement. Ideally, 3% – 5% of the cement mass must consist of gypsum. Variation in the percentage of gypsum used can compromise on the strength and durability of the cement. This can over a period lead to damage of the building itself.

Gypsum suppliers are manufacturing this material in white powdered form. Gypsum is normally accessed based on the color, whiteness, consistency, bending strength, setting time, etc. Once the cement is mixed manually or using a concrete mixer, it has to be applied within a short span of time. It will otherwise lead to the setting of cement, and it will be useless for plastering purpose. The reason for this is because gypsum is added to the cement.

Gypsum is a sulfate mineral consisting of calcium sulfate dihydrate and is used for several purposes other than with cement. It is also used for creating wallboards, plaster of Paris, cement, soil conditioning, etc.


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