CIVE 2700 Lecture Notes - Lecture 17: Asphalt Concrete, Emulsion, Polystyrene

• School: Carleton University
• Department: Civil Engineering
• Course: CIVE 2700
• Professor: John Gales

Document Summary

Bituminous materials are classified as asphalts and tars: Asphalt (cid:894)(cid:271)itu(cid:373)e(cid:374)(cid:895): o(cid:271)tai(cid:374)ed fro(cid:373) refi(cid:374)ed petroleu(cid:373): ver(cid:455) sti(cid:272)k(cid:455) a(cid:374)d highl(cid:455) (cid:448)is(cid:272)ous at roo(cid:373) te(cid:373)perature, used i(cid:374) road pa(cid:448)e(cid:373)e(cid:374)t, repairs, seali(cid:374)g, (cid:449)aterproofi(cid:374)g. asphalt (cid:272)e(cid:373)e(cid:374)t is a (cid:373)i(cid:454) of asphalt & aggregate. Tar: o(cid:271)tai(cid:374)ed fro(cid:373) distillatio(cid:374) of (cid:272)oal: tar flo(cid:449)s o(cid:374) a hot da(cid:455) a(cid:374)d is (cid:373)ore (cid:271)rittle o(cid:374) a (cid:272)old da(cid:455). While tar was once commonly used as a binder in paving materials, it is used less often now for a number of reasons: 1. It ages/oxides more rapidly than asphalt does, shorter service life. Tar is more temperature sensitive than asphalt: it is a class i carcinogen and hence vapours can be hazardous to health. However, tar is not soluble in petroleum products. In cases where fuel or oil spills are expected, tars can be used as the binder in pavements. (e. g. airports, gas stations & parking lots).