What is Self-Healing Concrete? Autogenous and Autonomous Healing — Transcript

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1. 0:01self-healing concrete is a type of
2. 0:03concrete that can heal itself from the
3. 0:05micro cracks formed in it and regain its
4. 0:08original state
5. 0:10the self-healing property in concrete
6. 0:12gives the ability to heal itself during
7. 0:15the cracks and protect the interior
8. 0:17metrics and reinforcement bars within
9. 0:20the concrete
10. 0:21this helps to increase the durability of
11. 0:24concrete structures
12. 0:26self-healing concrete is made by
13. 0:28introducing healing agents like bacteria
14. 0:31fungus or sodium silicate or polymerge
15. 0:34to concrete
16. 0:36healing agents are used and studied over
17. 0:39years by scientists and Engineers around
18. 0:41the world
19. 0:43the concept of self-healing in concrete
20. 0:46is evolved from the biological life
21. 0:48forms like plants and animals that
22. 0:50exhibits a self-healing process
23. 0:52naturally when any damage occurs to them
24. 0:58the self-healing process in concrete can
25. 1:01be of two types autogenous self-healing
26. 1:04and autonomic self-healing
27. 1:07autogenous healing is the ability of the
28. 1:09concrete to repair or heal the cracks in
29. 1:11the presence of moisture among the most
30. 1:14highlighted properties of concrete such
31. 1:16as strength durability versatility and
32. 1:18economy the most overlooked property of
33. 1:21concrete is autogenic healing autogenous
34. 1:24healing is a process recognized at an
35. 1:26early stage of the development of
36. 1:27concrete strength
37. 1:29the Studies have shown that the process
38. 1:31not only heals the cracks but also
39. 1:34restores the concrete strength
40. 1:38the process of autogenous healing is
41. 1:40higher in early stages of concrete
42. 1:42strength gain as it is the time period
43. 1:44when there is larger content of
44. 1:46unhydrated cement so this phase involves
45. 1:49compressy strength gain and wet dry
46. 1:52cycles that further helps to improve the
47. 1:55healing performance of concrete
48. 1:57the autogenous healing in concrete can
49. 1:59happen either due to physical cause
50. 2:01chemical cause or mechanical cause a
51. 2:05combination of this can also happen as
52. 2:07shown the figure
53. 2:08so the physical cause implies the
54. 2:10swelling up of the hydrated cement paste
55. 2:13which is the hydration product of cement
56. 2:15when reacted with water
57. 2:17number two is the chemical reasons
58. 2:20chemical reasons can be classified into
59. 2:22two main types number one is the
60. 2:25formation of calcium carbonates and that
61. 2:27getting deposited within the cracks
62. 2:29calcium carbonate also known as galsite
63. 2:32is formed by the reaction between carbon
64. 2:35dioxide present in the air and the
65. 2:37calcium present in the concrete the
66. 2:40second chemical reaction that is
67. 2:41possible is the hydration reaction of
68. 2:44unhydrated cement particles that are
69. 2:46present in concrete there are
70. 2:48possibilities that complete demand does
71. 2:51not get hydrated during the hydrated
72. 2:53reaction the few cement clingers remain
73. 2:56as such and they get further hydrated
74. 2:59when they get in contact with a
75. 3:01favorable condition so such unhydrated
76. 3:04cement particles react and will
77. 3:06cooperate in filling up the cracks
78. 3:09the third reason for autogenous healing
79. 3:11is mechanical reasons mechanical reasons
80. 3:14may be due to the chipping off concrete
81. 3:17particles or aggregate particles within
82. 3:19the crack surfaces and that results in
83. 3:22filling up the crack area
84. 3:24if the concrete crack surface is contact
85. 3:26with a water body as shown in the figure
86. 3:28the depresses from the water can get
87. 3:30collected into the crack as shown and
88. 3:33helps in filling up the crack formed in
89. 3:35the concrete
90. 3:36in addition to the Natural self-healing
91. 3:39happening within the concrete autogenous
92. 3:41healings process can be enhanced by
93. 3:43introducing certain substances into the
94. 3:46concrete mixture number one is fibers
95. 3:49number two a shrinkable polymers and
96. 3:52number three is mineral at mixtures that
97. 3:55really enhances the property of healing
98. 3:58within the concrete as shown in the
99. 3:59figure
100. 4:02number two was autonomic self-healing
101. 4:04and concrete an autonomic self-healing
102. 4:06system requires the help of a healing
103. 4:09agent to facilitate self-healing in
104. 4:11concrete the healing agent is released
105. 4:14to the nearby crack formed in the
106. 4:16concrete either by encapsulation method
107. 4:19or continuous vascular Network these are
108. 4:23the two methods in which the healing
109. 4:24agents are brought near to the crack
110. 4:26form and the capsules carry the healing
111. 4:30agents so that the healing agents can
112. 4:32interact with the crack and fill it the
113. 4:34common healing agents that is used for
114. 4:36autonomic self-healing in concrete are
115. 4:39epoxy resins expansive minerals hydrogel
116. 4:42and bacteria-based microorganisms
117. 4:47self-healing concrete is an Innovative
118. 4:49technology that is useful in bringing up
119. 4:51more smart and resilient infrastructure
120. 4:54development in this video we have
121. 4:56discussed the natural way of
122. 4:58self-healing that is the autogenous
123. 5:00self-healing process and artificial way
124. 5:02of self-feeling in concrete that is the
125. 5:04autonomic self-healing process
126. 5:06in detail now autonomous self-healing
127. 5:10process can be varied based on what kind
128. 5:13of healing agent that is being used it
129. 5:15is merely dependent upon what type of
130. 5:16crack and what type of concrete
131. 5:18structure is in your hand for repair
132. 5:21self-healing concrete technology helps
133. 5:24to develop country structures without
134. 5:26the worry of damage or intensive
135. 5:28maintenance during the life period of
136. 5:31the particular structure
137. 5:32however it is still in its growing stage
138. 5:35of flourish for greater applications in
139. 5:37the construction industry
140. 5:40hope you understood the basic concept of
141. 5:42what is self-healing concrete and its
142. 5:44types
143. 5:45for more such related videos on civil
144. 5:48engineering and construction kindly
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