Effects of Paving Technology, Pavement Materials, and Structures on the Fatigue Property of Double-Layer Pavements

Table 5

Bending fatigue test results.

Mixture types		Structure thickness (cm)		Paving technologies	Fatigue life under the following stress levels
Surface layer	Bottom layer	Surface layer	Bottom layer		0.3	0.4	0.5	0.6	0.7
AC-13	AC-20	4	6	Traditional paving	4521	1550	635	421	258
					4690	1830	696	435	277
					5063	1858	815	482	322
				(%)	4.8	8.0	10.4	5.8	9.4
				Double-layer paving	5103	1530	804	431	223
					6146	1634	830	489	261
					6853	1961	848	591	315
				(%)	11.9	10.7	2.2	13.1	14.2
AC-16	AC-25	4	6	Traditional paving	4394	1371	505	349	157
					4517	1453	568	363	189
					4671	1556	595	405	220
				(%)	2.5	5.2	6.8	6.4	13.6
				Double-layer paving	5039	1471	854	526	216
					5092	1586	958	593	235
					5161	1665	1101	641	258
				(%)	1.0	5.1	10.4	8.0	7.3
AC-13	AC-20	3	7	Traditional paving	5971	1648	664	500	270
					6039	1800	778	541	288
					6133	1919	781	566	331
				(%)	1.1	6.2	7.3	5.1	8.6
				Double-layer paving	7539	2407	1023	704	454
					8337	2582	1151	711	468
					8981	2663	1200	763	545
				(%)	7.1	4.2	6.6	3.6	8.2
AC-16	AC-20	3	7	Traditional paving	4957	1628	627	456	245
					5188	1749	680	503	268
					5382	1859	691	529	288
				(%)	3.4	5.4	4.2	6.1	6.6
				Double-layer paving	5883	1952	928	503	287
					6451	2026	991	522	312
					6984	2171	1144	534	377
				(%)	7.0	4.4	8.9	2.5	11.7