Testing of physical-mechanical properties of coarse aggregate, used for producing asphalt mixtures, and analysis of test results

Abstract

In Lithuania investigation of various physical-mechanical properties of aggregate by using test methods of EU standards was started already in 2004. A lot of tests were carried out for different type of aggregates of different manufacturers to determine resistance of aggregate to freezing and thawing (F value) according to EN 1367-1, resistance to fragmentation (SZ and LA values) according to EN 1097-2 and the polished stone value PSV according to EN 1097-8. Taking into consideration aggregates, available in Lithuania and used in road building, the suitability tests and requirements for their properties were described. Based on the tests of rocks of the same origin and on the analysis of results obtained the relationship between F, LA, SZ and PSV physical and mechanical values was identified. When investigating aggregates used in road building the suitability of each test method was assessed for Lithuanian climatic conditions. It was determined that the assessment of aggregate suitability by use of freezing and thawing test is not suitable to Lithuanian climatic conditions. Investigated aggregates are suitable not only for asphalt concrete pavement and road pavement structure base layers, but can be used to transport construction, and building on the foundations of watertight clay soils in place if there are of good filtration.