Biochar admixtured lightweight, porous and tougher cement mortars: Mechanical, durability and micro computed tomography analysis

Praneeth, Sai; Saavedra, Laureen; Zeng, Maria; Dubey, Brajesh; Sarmah, Ajit K.

doi:10.1016/j.scitotenv.2020.142327

Cited by 83 publications

(23 citation statements)

References 35 publications

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Section: Resultsmentioning

confidence: 99%

“…The compressive strength of CB2 (2%) was comparable to the control (CC). The compressive strength of CB5 (5%) was significantly reduced because excessive porous biochar adversely affects the strength [22]. For 300 °C, the residual compressive strengths of CC, CB2 and CB5 were 47.4, 54.5 and 50.8 MPa, respectively.…”

Section: Residual Compressive Strengthmentioning

confidence: 99%

“…In addition, UPV decreased with the increase in biochar content at 300 °C, which is inconsistent with For 20 • C, as shown in Figure 4, the UPV decreased with the increase in the biochar content. The internal pores of the biochar and entrapped pores due to the addition of biochar reduced the compactness of the sample [22], thereby slowing the propagation in the ultrasonic pulse.…”

Section: Upvmentioning

confidence: 99%

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Behavior of Biochar-Modified Cementitious Composites Exposed to High Temperatures

et al. 2021

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In this study, the effect of biochar on the high temperature resistance of cementitious paste was investigated using multiple experimental methods. The weight loss, cracks, residual compressive strength, and ultrasonic pulse velocity (UPV) of biochar cementitious paste with 2% and 5% biochar exposed to 300, 550 and 900 °C were measured. The products and microstructures of biochar cementitious paste exposed to high temperatures were analyzed by X-ray diffraction, Fourier transform infrared spectroscopy, thermogravimetric analysis, and scanning electron microscopy. The results showed that the cracks of specimens exposed to high temperatures decreased with increasing biochar content. The addition of 2% and 5% biochar increased the residual compressive strength of the specimens exposed to 300 °C and the relative residual compressive strength at 550 °C. As the exposure temperature increased, the addition of biochar compensated for the decreasing ultrasonic pulse velocity. The addition of biochar contributed to the release of free water and bound water, and reduced the vapor pressure of the specimen. The addition of biochar did not change the types of functional groups and crystalline phases of the products of cementitious materials exposed to high temperatures. Biochar particles were difficult to observe at 900 °C in scanning electron microscopy images. In summary, because biochar has internal pores, it can improve the high-temperature resistance of cement paste.

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Section: Resultsmentioning

confidence: 99%

Section: Residual Compressive Strengthmentioning

confidence: 99%

Section: Upvmentioning

confidence: 99%

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Behavior of Biochar-Modified Cementitious Composites Exposed to High Temperatures

et al. 2021

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“…Praneeth et al [87] explored the effect of replacing 10-40% of sand in concrete with biochar derived from poultry litter on the compressive strength. The results indicated that the compressive strength of the samples decreased drastically with the addition of biochar.…”

Section: Compression Strengthmentioning

confidence: 99%

Biochar-Added Cementitious Materials—A Review on Mechanical, Thermal, and Environmental Properties

Mensah

Vigneshwaran

Narayanan³

et al. 2021

Sustainability

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The enhanced carbon footprint of the construction sector has created the need for CO2 emission control and mitigation. CO2 emissions in the construction sector are influenced by a variety of factors, including raw material preparation, cement production, and, most notably, the construction process. Thus, using biobased constituents in cement could reduce CO2 emissions. However, biobased constituents can degrade and have a negative impact on cement performance. Recently, carbonised biomass known as biochar has been found to be an effective partial replacement for cement. Various studies have reported improved mechanical strength and thermal properties with the inclusion of biochar in concrete. To comprehend the properties of biochar-added cementitious materials, the properties of biochar and their effect on concrete need to be examined. This review provides a critical examination of the mechanical and thermal properties of biochar and biochar-added cementitious materials. The study also covers biochar’s life cycle assessment and economic benefits. Overall, the purpose of this review article is to provide a means for researchers in the relevant field to gain a deeper understanding of the innate properties of biochar imparted into biochar-added cementitious materials for property enhancement and reduction of CO2 emissions.

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“…[ [96][97][98] Carbon sequestration -Biochar is recalcitrant in the soils turning them into a long-term carbon sink with several co-benefits for crops (see soil above). -Transfers carbon from the atmosphere into the soils.…”

Section: Potential Applications Of Biochar In the Neamentioning

confidence: 99%

Potential for Farmers’ Cooperatives to Convert Coffee Husks into Biochar and Promote the Bioeconomy in the North Ecuadorian Amazon

Salgado

Säumel

Cianferoni³

et al. 2021

Applied Sciences

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Improving the livelihoods of communities living in fragile ecosystems, such as tropical forests, is among the main strategies to promote their conservation and preserve wildlife. In the Ecuadorian Amazon, farmers’ cooperatives are recognized as an important mechanism to improve the socioeconomic conditions of local communities. This study analyzes the integration of pyrolysis processes to convert agricultural waste into biochar as a way to implement the bioeconomy in these organizations. We found that post-harvesting processes in the studied farmers’ cooperatives are similar, and coffee husks are a potential feedstock to produce biochar. Although the environmental policies in Ecuador consider the valorization of agricultural waste, we did not find any specific standard to regulate the operation of pyrolysis facilities. Nonetheless, conversion of agricultural waste into biochar can contribute to (i) replacement of subsidized fossil fuels used in drying processes, (ii) prevention of environmental pollution caused by accumulation of waste, (iii) emergence of new income sources linked with the provision of carbon sequestration services, and (iv) the long-term maintenance of soil fertility. Currently, demonstration projects are needed to stimulate collaboration among farmers’ cooperatives, academia, the government, international cooperation agencies, and existing forest conservation initiatives.

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Biochar admixtured lightweight, porous and tougher cement mortars: Mechanical, durability and micro computed tomography analysis

Cited by 83 publications

References 35 publications

Behavior of Biochar-Modified Cementitious Composites Exposed to High Temperatures

Behavior of Biochar-Modified Cementitious Composites Exposed to High Temperatures

Biochar-Added Cementitious Materials—A Review on Mechanical, Thermal, and Environmental Properties

Potential for Farmers’ Cooperatives to Convert Coffee Husks into Biochar and Promote the Bioeconomy in the North Ecuadorian Amazon

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