Question

In normal circumstances where ambient temperature does not fall below ${15}^{\circ }$C, for a properly cured reinforced concrete slabs spanning up to $4.5$ metre span cast using ordinary portland cement, the props provided can be removed only after a minimum period of

• A. $3$ days
• B. $7$ days
• C. $14$ days
• D. $21$ days

Answer 1

The correct option is B $7$ days

Strength shall be the guiding factor fo removal of formwork in normal circumstances where ambient temperature does not fall below ${15}^{\circ }C$ and where ordinary portland cements is used and adequate curing is done.

Type of Formwork	Formwork
$\cdot$ Props to slabs $\to$ Spanning up to $4.5m$ $\to$ Spanning over $4.5m$	$7days$ $14days$
$\cdot$ Props to beams and aches $\to$Spanning up to $6m$ $\to$ Spanning over $6m$	$14days$ $21days$
$\cdot$ Vertical formwork to columns walls, beams.	$16-24days$
$\cdot$ Soffit formwork to slabs	$3days$