TY - JOUR
T1 - Improving the properties of recycled aggregate pervious pavement blocks through bio-mineralization
AU - Liu, Mengdi
AU - Xia, Jun
AU - Seong Chin, Chee
AU - Liu, Zuowei
N1 - Publisher Copyright:
© 2020 Elsevier Ltd
PY - 2020/11/30
Y1 - 2020/11/30
N2 - Pervious concrete (PC) comprised of cement, water, coarse aggregates are widely used nowadays for sustainable and low impact pavement. The primary purpose of this study is to investigate the performance enhancement of pervious concrete blocks (PCB) containing recycled coarse aggregates (RCA) through microbially induced calcium carbonate precipitation (MICP). Two types of bacterial enhancement methods were adopted, which are PCB with pre-soaked RCA using bacteria solution and PCB with bacteria added mixing water. The properties of RCA, cement paste, and PCB were measured. The water absorption of RCA soaked in the bacteria and culture medium for 21 days was reduced by 10.41%. Meanwhile, the porosity of PCB decreased by 15.70%, and compressive strength increased up to 28.48% when incorporating pre-soaked RCA. There was an increase of 57.23% in compressive strength for hardened cement paste when bacteria were added in the mixing water. The compressive strength of PCB increased by 35.48% when compared with PCB with normal mixing water. Both enhancement methods show promising results and realize the purpose of enhancing the properties of PCB containing RCA.
AB - Pervious concrete (PC) comprised of cement, water, coarse aggregates are widely used nowadays for sustainable and low impact pavement. The primary purpose of this study is to investigate the performance enhancement of pervious concrete blocks (PCB) containing recycled coarse aggregates (RCA) through microbially induced calcium carbonate precipitation (MICP). Two types of bacterial enhancement methods were adopted, which are PCB with pre-soaked RCA using bacteria solution and PCB with bacteria added mixing water. The properties of RCA, cement paste, and PCB were measured. The water absorption of RCA soaked in the bacteria and culture medium for 21 days was reduced by 10.41%. Meanwhile, the porosity of PCB decreased by 15.70%, and compressive strength increased up to 28.48% when incorporating pre-soaked RCA. There was an increase of 57.23% in compressive strength for hardened cement paste when bacteria were added in the mixing water. The compressive strength of PCB increased by 35.48% when compared with PCB with normal mixing water. Both enhancement methods show promising results and realize the purpose of enhancing the properties of PCB containing RCA.
KW - Flexural strength
KW - Microbially induced calcium carbonate precipitation
KW - Permeability
KW - Porosity
KW - Tensile splitting strength
UR - http://www.scopus.com/inward/record.url?scp=85087785644&partnerID=8YFLogxK
U2 - 10.1016/j.conbuildmat.2020.120065
DO - 10.1016/j.conbuildmat.2020.120065
M3 - Article
AN - SCOPUS:85087785644
SN - 0950-0618
VL - 262
JO - Construction and Building Materials
JF - Construction and Building Materials
M1 - 120065
ER -