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Shrinkage stresses are usually relieved by cracking of the hardened concrete. However, if these cracks are not repaired, they will lead to corrosion of steel reinforcement, cracks in the concrete structure and ultimately to complete failure of the concrete structure .
2. Chemical cracking (usually due to water loss). Chemical cracking is a chemical reaction that occurs on the surface of concrete as water in concrete is lost to the surroundings. This type of cracking is usually done by adding sodium hydroxide and potassium chloride to the concrete. This is usually done to crack the concrete in order to allow water in the concrete to drain. This usually occurs 3 to 6 hours after the concrete has been cast.
1. Mechanical cracking. Shrinkage of concrete is caused by the expansion of pores in the cement matrix as water in the concrete (and air in the plastic concrete) is lost to the surroundings. Shrinkage cracks are the most common type of concrete cracking. Mechanical cracking of concrete can be done by various methods:
The first method is the application of hydraulic pressures on the surface of concrete using a jackhammer. This can also be done through the use of a hydraulic press. It is always preferable to have a concrete lab or a concrete quarry to ensure that concrete is tested before it is used. It is important to test the concrete to ensure that the concrete has a thick enough cover in order to protect the workman from the surface of the concrete. The target is to cause a large crack in the concrete but not a hole in the concrete.
3. Electrochemical cracking (also known as electric aging). This is done by applying an electric current of around 10 amps to the concrete. This also occurs 3 to 6 hours after the concrete has been cast. The most widely known method of electrochemical cracking is the Torque method.
The Torque method consists of a hydraulic jackhammer. The concrete is placed between a base plate and a cone. The base plate is rotated and the concrete between the base plate and cone is cracked. An electric current of around 10 amps is applied to the concrete. The current is applied to the base plate of the jackhammer and the rotating cone is the cathode.
The overall effect of plastic shrinkage is the volume loss (shrinkage), which the concrete will suffer when the concrete is in the plastic state [23,24]. If not properly restrained, plastic shrinkage will induce several cracks, especially at the edges of the mix and in the mass, as shown in Figure 2 . These cracks can induce internal damages (shrinkage) as well as surface damages, which are commonly known as surface cracks . On the other hand, the shrinkage cracking can be effectively controlled by adding steel fibers in concrete [24,25,26,27,28].
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