This document discusses curing and its methods for concrete. Curing refers to keeping concrete surfaces moist in order to preserve its properties and prevent moisture loss through evaporation. Several curing methods are described, including coating the surface with bitumen or waterproofing compound, covering with waterproof paper or layers of wet sand/clay/gunny bags, and membrane or ponding curing. Curing allows necessary chemical reactions to occur and strength to develop over 3 weeks, so concrete should be kept wet during this period.

2. CONSTRUCTION
ENGINEERING
Presented By:
Prof.Dr. Kanya Lal

3. CONSTRUCTION ENGINEERING
Presented By:
Prof.Dr. Kanya Lal

4. CURING
AND
ITS
METHODS

5. CURING AND ITS METHODS
Curing:
The process of keeping the concrete
surface moist in order to preserve its
properties is called Curing.
Object of curing:
The object of curing is to prevent the loss of
moisture from concrete due to evaporation
or because of any other reason.
To do curing,i.e to prevent the loss of
moisture from the concrete any one of the
following methods is used:
(1) The surface of concrete is coated with a
layer of bitumen or similar other water-
proofing compound which gets into the
pores of concrete and prevents loss of
water from concrete.
Continued-----

6. CURING AND ITS METHODS
(2) Concrete surface is covered with water-proof paper
or with a layer of wet sand or clay. It could be
covered with wet gunny bags.
Membrane and Ponding curing methods are also
widely used methods of concrete curing.
Immediately after placing the concrete it should be
covered with wet gunny bags. After 24 hours a
layer of bitumen or wet sand or clay should be laid
on it. After laying concrete, it should be laid on it.
After laying concrete, it should be protected from
direct rays of sun, from dry hot winds and from
frost.
Continued-----

7. CURING AND ITS METHODS
Strength and hardness to cement comes because of
its chemical reaction with water. This chemical
reaction continues for a long time however, a major
part of it is complete in about three weeks period. As
such sufficient water should be made available to
concrete for about three weeks so that it gains full
strength. The process of keeping concrete wet to
enable it to attain full strength is known as curing.
Curing should be done for a period of three weeks
but in no case for less than ten days.

8. THE END