Summary of self healing concrete preparation

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.

Edited at 2021-12-06 06:24:33

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saker.msc@gmail.com

Summary of self healing concrete preparation

saker.msc@gmail.com

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Outline

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