As mentioned earlier, plastic shrinkage cracks are usually observed in the lower part of the surface, but several cracks can be found in the upper part of the concrete surface. This is because the deformation of the concrete is more significant in this region, which can have a direct effect on the macro-crack width.
In addition, concrete cracked in the upper region may not be detected by the instrument, due to its distance from the surface, which is usually much greater than the recording distance of the instrument. Furthermore, the index does not record the deflection of the concrete, due to its large weight. The surface deflection of concrete, along with its thickness, is recorded by the instrument in a better way than the deflection of the concrete bottom layer, due to their small thickness.
Based on these results, the ASTM C1579  air-drying test may not be optimal for regions in which air drying does not occur or air drying is not monitored. Air drying, as was observed in Riyadh, is not a regular practice, as it is possible to predict air drying (ie, concrete drying before the concrete is exposed to air). Also, since a natural climate change was examined in the present study, the high temperatures of the summer and low temperatures of the winter are not frequent. These high temperatures, however, may occur more regularly in concrete surfaces, due to construction and architectural features, such as reinforced concrete panels. This may mean that air drying is not an effective method for reducing cracks in such surfaces, where concrete cracks may occur in an abnormal way.
In general, studies on the effect of temperature on concrete shrinkage cracking are scarce. Even so, plastic shrinkage cracking is a major reason for early-age concrete cracking . However, the effect of temperature on plastic shrinkage cracking is rarely examined, and to reduce the effect, cooling systems should be used to slow down the setting time of concrete .
Borg et al.  examined the effect of using recycled PET fibers on the plastic shrinkage cracking of concrete and found that the use of recycled PET fibers can decrease the plastic shrinkage cracking of concrete.
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