Chemkrete Modified asphaltic concrete field trial construction and three year evaluation : experimental project program No. 3 asphalt additives.

PDFTech ReportResearch Report No. 199Asphalt concreteEvaluationPerformanceMixturesField testsBindersCrackingAsphalt additivesLouisianaLouisiana. Department of Highways. Research and Development SectionPaul, Harold R.Louisiana. Department of Highways. Research and Development SectionUnited States. Federal Highway AdministrationUS Transportation CollectionThis report documents the construction of a Chemkrete modified asphaltic concrete field trial and presents three year performance data. Normal plant and roadway operations were maintained throughout the production of the Chemkrete modified mix. Initial binder testing, however, indicated the possibility of non-uniform blending of the Chemkrete additive. An additional problem surfaced during production control and acceptance testing: stabilities below specification limits. While upon curing the mix attained stabilities greater than the control mix, the low initial stabilities may require changes to control and acceptance procedures.Performance evaluations were conducted on an annual basis and included Pavement Condition Ratings, structural evaluation and the examination of binder properties (as extracted and recovered from roadway samples). No discernable performance differences were observed on the basis of these parameters. Both the conventional AC-30 binder and the Chemkrete modified binder demonstrated excessive aging characteristics. The aged binders, both conventional and modified, have contributed to loss of surface fines and wider than normal reflected shrinkage cracking from the soil cement base. The benefits of Chemkrete could not be ascertained during this evaluation period