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The cracking is caused by the shrinkage of cement mortar and the loss of water caused by the crack. When the crack is sealed by self-sealing, the perviousment section is covered by the cement mortar and the water flow is channelized. In this way, the flow of water in the section of cracked cement mortar is greatly increased. This is the main factor to affect the self-sealing ability. The degree of self-sealing ability is closely related to the thickness of the cement mortar. As shown in Figure 18a, the crack in the dry specimen was not sealed well. The cement mortar around the crack was thin and the water could leak out through the cracks. A large amount of water flowed into the section of cracked cement mortar and caused the specimen to lose its shape. In addition, the proportion of the crack was increased. Figure 18b shows a cracked specimen sealed with the self-sealing technology. The cement mortar around the crack was thick. Only a small amount of water leaked into the section of cracked cement mortar. The cracked specimen had a good shape. Furthermore, the proportion of the crack was reduced and the self-sealing ability of the specimen was enhanced. In the case of Table 18, the self-sealing ability of broken cement mortar was enhanced. In particular, the thickness of the cement mortar was up to 40 mm. The cracked section was approximately 40% of the whole specimen. In this case, the water leakage was considerable. Figure 18c shows the cracked specimens with self-sealing technology. The cracked specimens were sealed and the cement mortar thickness was about 30 mm. Compared with Figure 18b, the crack proportion was reduced by about 50%. The self-sealing ability was enhanced.2.3.4 Depth2.3.5 Fertility2.3.6 Salinity/sodicity2.3.7 Infiltration rate2.3.8 Available water capacity (AWC)2.3.9 Constructional characteristics 827ec27edc