Design of bituminous mixes

Τίτλος

Design of bituminous mixes

Θέμα

Asphalt

Macadam

Bituminous materials

Δημιουργός

Loizias, Andreas A.

Πηγή

Higher Technical Institute

Το πλήρες κείμενο είναι διαθέσιμο από το Υπουργείο Ενέργειας, Εμπορίου Βιομηχανίας και Τουρισμού

Εκδότης

Library of Cyprus University of Technology

Ημερομηνία

1994

Δικαιώματα

Απαγορεύεται η δημοσίευση ή αναπαραγωγή, ηλεκτρονική ή άλλη χωρίς τη γραπτή συγκατάθεση του δημιουργού και κάτοχου των πνευματικών δικαιωμάτων.

Μορφή

pdf

Γλώσσα

eng

Τύπος

text

Αναγνωριστικό

CED0221

Σύνοψη

The range of possible mix compositions is almost infinite, from single size coated stone at one extreme to mastic asphalt at the other. However, the types of bituminous mixes used worldwide can be broadly
classified as either asphalts or macadams.
The principal differences between asphalts and macadams are as follows:
I. The grading of the aggregate in an asphalt is usually a relatively single-sized coarse aggregate with a large proportion of fine aggregate and very little intermediate sized material; as a result of this "gap" in the grading this type of mix is often referred to us "gap-graded" ; in macadams the aggregate grading is continuous.
II. The strength of an asphalt is dependent on the stiffness of the sand/filler/bitumen fraction, ie the mortar. The strength of a macadam is primarily achieved through friction and mechanical interlock of the agrregate particles.
III. As asphalts contain a high proportion of filler, ie a large surface area of aggregate to coat, they have a relatively high bitumen content; on the other hand macadams have less fine aggregate, thus less bitumen is required to coat the aggregate satisfactorily.