Time-Saver Standards for Landscape Architecture - Design and Construction Data (second edition)_6-7.pdf

文档介绍：820-5
Emulsified asphalts 9 Cutback asphalts III
Anionic Cationic Medium curing (MC) B slow curing (SC)
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'Emulsified asphalts shown are AASHTO and ASTM grades and may not include all grades produced in all geographical areas. tnEvaluation of emulsified asphalt-aggregate system required t 0
determine the propergrade of emulsified asphalt to use, "Use of the rapid cure (RC) asphalts is not shown on this chart since theiruse is ing rare and is discouraged for energy and
environmental reasons . Use of emulsified asphaltsis encouraged instead . Source The Asphalt Institute . N
Time-Saver Standards for Landscape Architecture
820-6
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increase the chances of sharp ing . I_4
to the surface.
1 . Different types of aggregate provide varying degrees of suitability for asphalt paving
3 .4 Selection Criteria for Aggregates
with regard to hardness, resistance to stripping, surface texture, and crushed shapes
Table 820-5 shows four important criteria to (see Table 820-5) .
consider when assessing the value of a par- 2. The larger the size of aggregates in a gradation, the greater will be the strength and
ticular aggregate for use in an asphalt pave- durability of the pavement .
.
ment . Each criterion is described below 3. Gradations with larger aggregates result in a rougher pavement (or surface texture)
than do gradations with finer aggregate.
1 . Hardness (Toughness): is the ability
of the aggregate to withstand loads 4. The larger the aggregates, the greater will be th