Effects of biological admixtures on hydration and mechanical properties of Portland cement paste

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The present study investigated the effects of biological admixtures on hydration kinetics and mechanical properties of Portland cement paste. The biological admixtures consisted of nutrient, urea, calcium lactate, and ureolytic bacterium, and were added to the cement slurry during the mixing process in a solution form. The ureolytic bacterium was newly isolated in river sediment, and was incorporated in a vegetative cell state. Five types of specimens with varying components of the biological admixtures were water-cured for 28 days. To evaluate the hydration kinetics and mechanical properties of Portland cement paste with biological admixtures, isothermal calorimetry, thermogravimetry, mercury intrusion porosimetry, and a compressive strength test were conducted. The obtained results showed that the mechanical properties were improved due to the porosity reduced by CaCO3 precipitation metabolism of ureolytic bacterium. Further, the hydration was delayed by biological admixtures, and was more affected by components of nutrients than by microbial metabolism.
Publisher
ELSEVIER SCI LTD
Issue Date
2020-02
Language
English
Article Type
Article
Citation

CONSTRUCTION AND BUILDING MATERIALS, v.235, pp.117461

ISSN
0950-0618
DOI
10.1016/j.conbuildmat.2019.117461
URI
http://hdl.handle.net/10203/268745
Appears in Collection
CE-Journal Papers(저널논문)
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