This is a summary mind map about self healing concrete preparation. Self-healing concrete is the process of self-healing up of cracks or self-filling of damages with the help of bacterial reaction in the concrete after hardening.
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Summary of Self-Healing Concrete Preparation
Introduction
Drawback of Concrete
Concrete can crack and when it cracks, it can cause corrosion of rebar, maintenance is required.
Performance of S.H.C
Bio-mineralization Efficiency and lmbolization of
Healing Agent
Drawbacks of S.H.C
Bio-mineralization With Ureolysis Break down of
urea into ammonia and carbon dioxide which is environmental unfriendly.
Strength decrease due to porous healing agent carrier.
Preparation & Production
Preparation of Bacillus
Subtilis
1. Suitable bacteria acting as a
healing agent is the key
2. Four governing conditions- 1.
Calcium Concentration,
2.Concentration of dissolved
inorganic carbon 3. The PH 4.
A vailability of nucleation
sites
3. Eleven available B. subtilis
bacterium were cultivatedin
4. Luria Bertani (LB) medium,
which was adjusted by
5. Ca(OH)2 solution to elevated
Production of Self Healing
Concrete
Adding Bacteria Freeze Dried Powder
to Liquid Culture
Crack Seal Evaluaion
Fracture Crack by 3-Point bending Test
Crack-healingIncubation
Flexural Strength Recover Evaluation
Conclusion
Although maximum 0.3mm-width crack gap can be sealed with calcite
precipitation in 28days, the heal rate dropped dramatically with crack
depth increasing. The indepth healing remains a challenge for the
future researchers.
With B. subtilis M9, self-healing concrete was produced with flexural strength of 4.2MPa according to 3-point-bending test. After 28 days of self-healing, the sealed beam flexural strength subjected to second time bending was enhanced about average 14o/o strength recovery rate. Still the strength regain capability needs to be further improved for field study to achieve 50% strength recover by self-healing.
Submitted To : Dr. Thanakorn Pheeraphan
Name: Mohammad Abdus Saker
ID: st122611
Summary of self healing concrete preparation
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Summary of Self-Healing Concrete Preparation
Introduction
Drawback of Concrete
Concrete can crack and when it cracks, it can cause corrosion of rebar, maintenance is required.
Performance of S.H.C
Bio-mineralization Efficiency and lmbolization of
Healing Agent
Drawbacks of S.H.C
Bio-mineralization With Ureolysis Break down of
urea into ammonia and carbon dioxide which is environmental unfriendly.
Strength decrease due to porous healing agent carrier.
Preparation & Production
Preparation of Bacillus
Subtilis
1. Suitable bacteria acting as a
healing agent is the key
2. Four governing conditions- 1.
Calcium Concentration,
2.Concentration of dissolved
inorganic carbon 3. The PH 4.
A vailability of nucleation
sites
3. Eleven available B. subtilis
bacterium were cultivatedin
4. Luria Bertani (LB) medium,
which was adjusted by
5. Ca(OH)2 solution to elevated
Production of Self Healing
Concrete
Adding Bacteria Freeze Dried Powder
to Liquid Culture
Crack Seal Evaluaion
Fracture Crack by 3-Point bending Test
Crack-healingIncubation
Flexural Strength Recover Evaluation
Conclusion
Although maximum 0.3mm-width crack gap can be sealed with calcite
precipitation in 28days, the heal rate dropped dramatically with crack
depth increasing. The indepth healing remains a challenge for the
future researchers.
With B. subtilis M9, self-healing concrete was produced with flexural strength of 4.2MPa according to 3-point-bending test. After 28 days of self-healing, the sealed beam flexural strength subjected to second time bending was enhanced about average 14o/o strength recovery rate. Still the strength regain capability needs to be further improved for field study to achieve 50% strength recover by self-healing.
Submitted To : Dr. Thanakorn Pheeraphan
Name: Mohammad Abdus Saker
ID: st122611
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Summary of Self-Healing Concrete Preparation
Introduction
Submitted To : Dr. Thanakorn Pheeraphan
Name: Mohammad Abdus Saker
ID: st122611
