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

Table 1

Properties of RAC aggregates and crushed clay bricks used in the tests.

Test indexes	RAC aggregate			Crushed clay bricks
	0-4.75 mm	4.75-9.50 mm	9.50-19 mm	0-4.75 mm	4.75-9.50 mm	9.50-19 mm
Apparent density/(g∙cm^−3)	2.60	2.65	2.61	2.30	2.43	2.41
Water absorption/(%)	8.20	4.58	3.43	11.30	11.55	10.72
Flat and elongated particles/(%)	—	7.7	6.8	—	7.6	7.8
Crushing strength/(%)	—	23.6		—	29.3
Liquid limit/(%)	27.3	—		27.8	—
Plastic limit/(%)	22.2	—		23.4	—
<0.075 mm/(%)	2.7	—		3.5	—