Fig. 3

Petrographic images of samples from stereo mikroskop. (1) The binder area is approximately 25–30%, and the binder-aggregate interface and the binder’s internal phase are good. (2) The binder area is approximately 10–15%, and the binder-aggregate interface and the binder's internal phase are intermittently good and weak. (3) The binder area is approximately 25–30%, and the binder-aggregate interface and the binder’s internal phase are good. (4) The binder area is about 20%, and the binder-aggregate interface and the binder’s internal phase are good. (5) The binder area is approximately 40–45%, and the binder-aggregate interface and the binder’s internal phase are good. (6) The binder area is approximately 20–25%, and the binder-aggregate interface and the binder’s internal phase are good. (7) The binder area is approximately 20–25%, and the binder-aggregate interface and the binder’s internal phase are weak. (8) The binder area is approximately 20–25%, and the binder-aggregate interface and the binder’s internal phase are weak. (9) The binder area is approximately 30–35%, and the binder-aggregate interface and the binder's internal phase are weak