Possible causes Description EVALUATION PAVEMENT DISTRESSES USING PAVEMENT CONDITION INDEX - Diponegoro University | Institutional Repository (UNDIP-IR)

18 Figure 2.4 Block Cracking GTC, 1998

b. Severity levels

Low level of intensity L: the classification of the low level of network cracks must provide one case: i. Non-filled cracks Non-Filled offer less than 10 mm. ii. Cracks filled with insulation any offer was in acceptable condition. Medium level of intensity M: the classification of moderate cracks network must provide one of the following: i. Width of cracks more than 10 mm and less than 75 mm. ii. Cracks introduced less than or equal to 75 mm and surrounded by light random badly broken. iii. Cracks filled with any offer and is surrounded by light random badly broken. Higher level of intensity H: it is for the classification of high intensity of the cracks network there must be one of the following: i. Any cracks filled or not filled with badly broken surrounded by random high or medium severity. ii. Showing unfilled cracks greater than 75 mm. iii. Cracks introduced about 100 mm and surrounded by very badly broken and broken.

c. How to Measure

Block cracking is measured in square meter of surface area. It usually occurs at one severity level in a given pattern section; however, any areas of the pavement section having distinctly different levels of severity should be measured and recorded separately. 19

d. Possible causes

Cracks are the retina of the functional and structural defects and the underlying cause. Of these cracks is a heat shrink material asphalt Association as a result of emotion and stress GTC, 1998. The league, as the appearance of these cracks the asphalt to harden significantly. However, cracks the retina of the defects of earlier pregnancies despite the increase in the level of intensity as a result of the impact loads, and the asphalt concrete vulnerable accelerate the onset of these cracks.

2.3.1.3 Longitudinal and Transverse Cracks:

a. Description

Longitudinal cracks are parallel to the pavement’s center-line or laydown direction. They may be adjacent to the pavement edge. Transverse cracking occurs predominantly perpendicular to the pavement centerline. It can occur anywhere within the lane. See Figure 2.5 Longitudinal and Transverse Cracks. Figure 2.5 Longitudinal and Transverse Cracks GTC, 1998