Effects of Coarse and Fine Crushed Clay Brick Content on the Compressive Strength of Recycled Aggregate Concrete and the Microscopic Mechanism

Figure 10

Microscopic morphology of the interfaces between the three aggregates and the cement paste (magnified 3000 times).

(a) The interfacial transition zone between natural aggregate and cement

(b) The interfacial transition zone between recycled aggregate and cement

(c) The interfacial transition zone between coarse crushed clay bricks and cement