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The use of fillers in bituminous road surfacings. A study of filler‐binder systems in relation to filler characteristics

1947; Wiley; Volume: 66; Issue: 9 Linguagem: Inglês

10.1002/jctb.5000660902

0368-4075

P J Rigden,

Asphalt Pavement Performance Evaluation

Abstract The paper describes a study of the fineness characteristics of. a wide range of fillers used in the production of bituminous road surfacings. The object of this study was to find a simple characteristic of the filler which could be directly related to the behaviour of filler‐binder mixtures, both at low filler concentrations which occur in many types of thin surfacing, and at high filler concentrations which occur in dense surfacings of the “asphalt” type. An investigation is then described into the flow properties of a number of filler‐binder systems containing both tar and bitumen binders, over a range of filler concentration from zero to the greatest amount which gave a cohesive mixture. The filler property found to be most simply related to these flow properties is the value of the fractional volume voids in the tightly‐compacted dry filler. The determination of this value is described and it is shown that from it the “optimum binder content” of any filler may be readily calculated. It is also shown that the relation between viscosity and filler concentration of any filler‐binder system may be most simply interpreted if the concentration of filler is expressed in terms of the degree of packing of the filler as calculated from the fractional volume voids.