title: Effect of Microorganism Sporosarcina pasteurii on the Hydration of Cement Paste.
abstract: Years of research have shown that the application of microorganisms increases the compressive strength of cement-based material when it is cured in a culture medium. Because the compressive strength is strongly affected by the hydration of cement paste, this research aimed to investigate the role of the microorganism Sporosarcina pasteurii in hydration of cement paste. The microorganism's role was investigated with and without the presence of a urea-CaCl2 culture medium (i.e., without curing the specimens in the culture medium). The results showed that S. pasteurii accelerated the early hydration of cement paste. The addition of the urea-CaCl2 culture medium also increased the speed of hydration. However, no clear evidence of microbially induced calcite precipitation appeared when the microorganisms were directly mixed with cement paste.
authors: School of Architecture and Civil Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors: Jun Cheol
authors: JC
authors: Lee
authors: Department of Architectural Engineering, Chungbuk National University, Cheongju 362-763, Republic of Korea.
authors: Chang Joon
authors: CJ
authors: Lee
authors: School of Architectural, Civil, Environmental, and Energy Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors: Woo Young
authors: WY
authors: Chun
authors: School of Architectural, Civil, Environmental, and Energy Engineering, Kyungpook National University, Daegu 702-701, Republic of Korea.
authors: Wha Jung
authors: WJ
authors: Kim
authors: Department of Architectural Engineering, Pukyong National University, Busan 608-739, Republic of Korea.
authors: Chul-Woo
authors: CW
authors: Chung
mesh_terms: D002119:Calcium Carbonate / Q000378:metabolism; D002122:Calcium Chloride / Q000378:metabolism; D055598:Chemical Phenomena; D019245:Compressive Strength; D003252:Construction Materials / Q000382:microbiology*; D003470:Culture Media / Q000737:chemistry; D004783:Environmental Microbiology; D058644:Sporosarcina / Q000502:physiology*; D013997:Time Factors; D014508:Urea / Q000378:metabolism
chemical_list: D003470:Culture Media; D014508:Urea; D002119:Calcium Carbonate; D002122:Calcium Chloride
keywords: Sporosarcina Pasteurii; characterization; compressive strength; hydration; microorganism