Research on Preparation and Performance of Clay-Based Shield Tunnel Nonsintered Bricks

Table 2

Experimental program.

Serial number	Muck (%)	Lime (%)	Cement (%)	Fly ash (%)	Polyvinyl alcohol (%)
Test 1	80	20	0	0	0
Test 2	70	30	0	0	0
Test 3	60	40	0	0	0
Test 4	50	50	0	0	0
Test 5	60	30	0	10	0
Test 6	50	30	0	20	0
Test 7	40	30	0	30	0
Test 8	30	30	0	40	0
Test 9	65	30	5	0	0
Test 10	60	30	10	0	0
Test 11	55	30	15	0	0
Test 12	50	30	20	0	0
Test 13	60	10	5	25	0
Test 14	55	10	5	30	0
Test 15	50	10	5	35	0
Test 16	45	10	5	40	0
Test 17	45	10	5	40	0.5
Test 18	45	10	5	40	0.75
Test 19	45	10	5	40	1
Test 20	45	10	5	40	1.25