Pre Engineering Question:
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Explain me why is propping required for long structures once the formwork is removed?

Answer:

Once the process of concreting is performed the striking of the form works should be done as soon as possible as delay in this process can lead to the discoloration of the concrete structures. In case of long structures particularly long span structures once the structures have attained enough strength to support themselves it is essential to provide them with propping as creep deflection can take place which can greatly reduce the integrity of the structure. Due to the above mentioned reasons propping should be done after the removal of form work. Also the props should not be made to stand long as it can lead to over stress for the structures.

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