Biostimulation of calcite precipitation process by bacterial community in improving cement stabilized rammed earth as sustainable material

TY - JOUR

T1 - Biostimulation of calcite precipitation process by bacterial community in improving cement stabilized rammed earth as sustainable material

AU - Fang, Chaolin

AU - Achal, Varenyam

N1 - Publisher Copyright: © 2019, Springer-Verlag GmbH Germany, part of Springer Nature.

PY - 2019/9/1

Y1 - 2019/9/1

N2 - Rammed earth has been enjoying a renaissance as sustainable construction material with cement stabilized rammed earth (CSRE). At the same time, it is important to convert CSRE to be a stronger, durable, and environment-friendly building material. Bacterial application is established to improve cementitious materials; however, bioaugmentation is not widely acceptable by engineering communities. Hence, the present study is an attempt applying biostimulation approach to develop CSRE as sustainable construction material. Results showed that biostimulation improved the compressive strength of CSRE by 29.6% and resulted in 27.7% lower water absorption compared to control. The process leading to biocementation in improving CSRE was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscope-energy dispersive spectrometer. Further, Illumina MiSeq sequencing was used to investigate changes in bacterial community structures after biostimulation that identified majority of ureolytic bacteria dominated by phylum Firmicutes and genus Sporosarcina playing role in biocementation. The results open a way applying biological principle that will be acceptable to a wide range of civil engineers.

AB - Rammed earth has been enjoying a renaissance as sustainable construction material with cement stabilized rammed earth (CSRE). At the same time, it is important to convert CSRE to be a stronger, durable, and environment-friendly building material. Bacterial application is established to improve cementitious materials; however, bioaugmentation is not widely acceptable by engineering communities. Hence, the present study is an attempt applying biostimulation approach to develop CSRE as sustainable construction material. Results showed that biostimulation improved the compressive strength of CSRE by 29.6% and resulted in 27.7% lower water absorption compared to control. The process leading to biocementation in improving CSRE was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, and scanning electron microscope-energy dispersive spectrometer. Further, Illumina MiSeq sequencing was used to investigate changes in bacterial community structures after biostimulation that identified majority of ureolytic bacteria dominated by phylum Firmicutes and genus Sporosarcina playing role in biocementation. The results open a way applying biological principle that will be acceptable to a wide range of civil engineers.

KW - Biocementation

KW - Biostimulation

KW - Calcite

KW - Rammed earth

KW - Sustainability

UR - http://www.scopus.com/inward/record.url?scp=85069895725&partnerID=8YFLogxK

U2 - 10.1007/s00253-019-10024-9

DO - 10.1007/s00253-019-10024-9

M3 - 文章

C2 - 31363824

AN - SCOPUS:85069895725

SN - 0175-7598

VL - 103

SP - 7719

EP - 7727

JO - Applied Microbiology and Biotechnology

JF - Applied Microbiology and Biotechnology

IS - 18

ER -