Effect of freeze-thaw cycling on grain size of biochar
Fig 3
Grain size distribution (at the maximum diameter of a biochar grain projection, Dmax) by volume for (a) pine; (b) mesquite; (c) miscanthus; and (d) sewage waste biochar from 0–20 F-T cycles in the undrained experiments. There were decreases in Dmax for pine, mesquite, and miscanthus biochars with increasing number of F-T cycles. However, distributions of Dmax for sewage waste biochar from 0–20 F-T cycles overlapped with each other, meaning that there is no change of Dmax distribution for sewage waste biochar. Values and errors are mean and standard deviation of triplicate samples. Numerical data for individual replicates are presented in S2 Table.