Semnan University International Journal of Nonlinear Analysis and Applications 2008-6822 15 5 2024 05 01 The effect of self-healing additive on the durability of cracked concrete 291 296 7867 10.22075/ijnaa.2023.30771.4488 EN Mahan Mohammadzadeh Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran Mehdi Nezhadnaderi Department of Civil Engineering, Tonekabon Branch, Islamic Azad University, Tonekabon, Iran Mehdi Ebadi Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran Arash Totonchi Department of Civil Engineering, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran Journal Article 2023 02 22 Self-healing techniques are presented in three different ways: The first application is the use of bacteria to calcite in concrete cracks. In this way, relatively large cracks can be filled in reinforced concrete. This method does not improve the strength of the structure, but by filling the crack, the reinforcement path is blocked. This stops the entry of liquids and ions that start to corrode the reinforcement and thus increase the compressive strength but decrease the electrical resistivity of the structure. With this method, cracks can be filled and leakage can be prevented. In designs that use a self-healing additive such as Mix designation 7, the time interval obtained from the accelerated corrosion test between the cracked and intact specimens is reduced. Compressive strength in cracked and intact specimens in these designs is higher than in other designs. The use of more superplasticizers and more Silica fume are effective in these amounts. Its low electrical resistance can lead to increased corrosion intensity thus more superplasticizers in Plan 7 is not preferable to Plan 4. Low electrical resistance can lead to increased corrosion intensity thus Plan 4 is preferable to Plan 7. https://ijnaa.semnan.ac.ir/article_7867_748bc0c8e3b77dd4327c09e0548902ad.pdf