Biochar as green additives in cement-based composites with carbon dioxide curing
By Lei Wang, Liang Chen, Daniel C W Tsang, Binglin Guo, Jian Yang, Zhengtao Shen, D. Hou, Y. Ok, Chi-Sun Poon. 2020
314 citations recorded by the source corpus.
Abstract Biochar is a green material obtained from the thermochemical conversion of waste biomass under an oxygen-limited condition. This study demonstrated a novel and sustainable method for incorporating waste wood-derived biochar in cement-based composites with CO2 curing. The X-ray diffraction (XRD) and thermogravimetric analyses (TGA) illustrated that the incorporation of biochar promoted the generation of additional cement hydrates owing to moisture regulation effect, but did not accelerate or delay the hydration process as indicated by the isothermal calorimetry results. Specifically, the addition of 1 wt% biochar increased the compressive strength of composites by 8.9%. However, the incorporation of 5 wt% biochar reduced the compressive strength due to the porous and brittle structure of biochar. CO2 curing was employed to mitigate these adverse effects. The CO2 curing approach accelerated carbonation more effectively than the method of air curing for composites production. After carbonation, the abundant cement hydrates improved the bonding strength and the carbonates densified the microstructure, which substantially enhanced the mechanical strength and carbon sequestration. Therefore, the combined use of waste biochar and CO2 curing could be a green technology for enhancing properties of cement-based composites and promoting waste recycling and CO2 utilisation.
Subfields: Civil and Structural Engineering, Earth-Surface Processes, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/aec334b4c3e5c4569bc27572f58a57e965faf66a
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Civil and Structural Engineering
In Materials Chemistry
Citations in the corpus
- Technologies and perspectives for achieving carbon neutrality (2021, methodology): “In addition, the possible use of biochar in the manufacturing of value-added constructionmaterials has been explored.(255,256) For instance, in a study, Das et al.”