Synthesis of pyrolytic carbonized bagasse to immobilize Bacillus subtilis; application in healing micro-cracks and fracture properties of concrete

被引:46
|
作者
Kanwal, Maria [1 ]
Khushnood, Rao Arsalan [1 ]
Khaliq, Wasim [1 ]
Wattoo, Abdul Ghafar [2 ,3 ]
Shahid, Tauseef [3 ]
机构
[1] Natl Univ Sci & Technol NUST, NUST Inst Civil Engn NICE, Sch Civil & Environm Engn SCEE, H-12 Campus, Islamabad 44000, Pakistan
[2] Khawaja Farid Univ Engn & Informat Technol KFUEIT, Dept Phys, Rahim Yar Khan 64200, Pakistan
[3] Chinese Acad Sci, Ningbo Inst Mat Technol & Engn, CAS Key Lab Magnet Mat & Devices, Zhejiang Prov Key Lab Magnet Mat & Applicat Techn, Ningbo 315201, Peoples R China
来源
关键词
Bacillus subtilis; Bagasse biochar; Fracture properties; Self-healing concrete; Sorptivity; Autonomous healing; SUGARCANE BAGASSE; CEMENT COMPOSITES; BIOCHAR; BACTERIA; CORROSION; NANOPARTICLES; RESISTANCE; MORTAR; PERFORMANCE; IMPROVEMENT;
D O I
10.1016/j.cemconcomp.2021.104334
中图分类号
TU [建筑科学];
学科分类号
0813 ;
摘要
Growing amount of agricultural waste and its burning in open environments is contributing towards the carbon emissions and triggering serious health hazards. It can be reduced by beneficially employing the wastes, as carrier media of calcite (CaCO3) precipitating microbes, into the concrete. Instant formation of CaCO3 in micro-cracks using bio-inspired concrete prevents aggressive ions to penetrate into the inside concrete, hence boosting the durability. In the present study, Bacillus subtilis (BS) were immobilized with nano-micro sized carbonaceous solid material, bagasse ground biochar (GBC), to enhance the CaCO3 precipitation. The mechanical behavior of the samples was investigated in terms of bending and compression. Biochar immobilized BS concrete (BSCM) exhibited promising flexural behavior, higher strain energy storing capability, and higher modulus of fracture toughness. Moreover, 23.18% enhancement in compressive strength was achieved after 56 days of curing in comparison to the control samples. Furthermore, autonomous cracks closure mechanism was monitored as the function of time, the BSCM showed effective crack healing with maximum 100% and 68% sealing of 500 mu m and 800 mu m wider cracks respectively, in the selected time frame. The BSCM samples revealed higher ultrasonic pulse velocities and lesser sorptivity due to the densified microstructure of concrete by bacterial precipitated CaCO3. The x-ray diffraction, scanning electron microscopy, energy dispersive x-ray spectroscopy and thermal gravi-metric analysis confirmed the existence of CaCO3 inside the cracks. Consequently, immobilizing BS with bagasse GBC could be considered as a promising solution for prompt cracks repairing and enhancing the mechanical properties of concrete.
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页数:16
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