A plastic polyethylene covering retains moisture in the concrete and improves temperature control.
Cement cure time using plastic sheeting.
This technique can also be used for upright concrete columns and walls by wetting them down and wrapping them with a curing blanket or plastic sheeting.
Contents why the curing of cement hellip.
On slabs the sheets should be placed when the concrete has hardened enough to prevent surface damage.
Curing concrete normal hot and cold weather.
Curing is the process of maintaining satisfactory moisture content and temperature in freshly cast concrete for a definite period of time immediately following placement.
Plastic sheets should be placed and fixed within half an hour of removal of formwork from vertical surfaces.
The concrete will be discolored anywhere the plastic touches it.
To produce high quality concrete active curing is necessary and according to aci the most effective method for highly wear resistant and durable concrete is wet curing for a period of 7 days.
Pigmented polyethylene sheeting provides a good curing medium as it is impervious to moisture light in weight and can be re used under good conditions.
Using plastic membranes.
The process serves two major purposes.
If not tent the plastic so it doesn t come into direct contact with the concrete.
Keeping the concrete continuously wet for 7 days can be a challenge but not for sika ultracure blankets.
Plastic sheeting also has the advantage of flexibility.
Condensed water pools wherever the plastic touches the slab but the concrete under the air pockets remains dry.
When temperatures are higher than 85 f reflective white colored sheets help to keep the concrete cool as it cures.
Advertisement do pond cure concrete slabs.
When plastic sheeting or curing blankets are placed atop a concrete slab much of the blanket is in direct contact with the concrete but there are also wrinkles and air pockets where the plastic remains suspended just above the slab.
Curing concrete with a membrane or plastic sheeting is the most practical and efficient way to cure concrete in today s construction industry sometimes water is unavailable for water curing or if it s done improperly it can affect the strength or the surface finishing of the concrete product.
If the temperature is below 60 f use dark colored plastic sheets to absorb more light and boost the temperature.
The main components which need to be taken care of are moisture heat and time during the curing process.
This may be achieved using impervious paper plastic sheeting applying.
Never spread wrinkling plastic sheets on the horizontal surfaces it may cause discolouration in patches.
The use of waterproof building papers or plastic film polyethylene sheeting will also prevent the evaporation of moisture from concrete.
