PJB-2021-709
PRODUCTION OF SELF-HEALING CONCRETE BY USING INDIGENOUS BACTERIA
MUHAMMAD UMAR BIN AAMIR
Abstract
Concrete is most widely used construction material because of its reliable maintenance and usage along with high fire and water resistivity. However the major drawback of using concrete is its inefficiency of healing cracks, fishers automatically that typically arises due to lower tensile strength of material as well as due to erosion, salling and popouts etc. The current study aims to investigate the stability parameters with more emphasis on compressive strength, flexural strength, pullout strength for optimization and comparison of self healing concrete with conventional concrete. In this study bacterial species namely bacillus clausii, bacillus coagulans and lactobacillus reuteri were used as well as preparation of bacterial growth medium was also conducted. Thus results estimated shows higher compressive strength in case of bacillus coagulans based bacterial concrete specimens tested at 7 and 28 days of curing that is 31.85 % and 37.08% along with higher flexural strength for bacillus coagulans and bacillus clausii containing 22.6% and 23% increment respectively at 7 and 28 days of curing with higher pullout strength for lactobacillus reuteri containing 51.26 % and 38.25 % respectively. Moreover it can be concluded that the use of bacterial based concrete specimens will be advantageous in reducing porosity, reinforcement bar corrosion as well as sealing of cracks to increase service life of structure. It will also improve compressibility and tensile strength to make it a life enriching and elegant construction material.
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