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Linear correlations between biochar dosage and the compressive strength of Portland cement composites: (a) biochar to binder weight ratio and effect size of 7-day compressive strength, (b) biochar to binder weight ratio and effect size of 28-day compressive strength. Points in each figure represent paired records. The simple linear regression lines with 95% confidential intervals are shown, with the number of records (n) presented. The horizontal dash lines represent the value of 0
