62
32
Table 2. Pottery Gradation Required Table 5. Grading Requirement For
For Water-bound Base Course
Hot-mix Bituminous Concrete
Total Passing, % By Wt.
Sieve size
Total passing, % by wt.
Sieve size
Coarse aggregate
! Inter-
mediate aggregate
Fine aggregate
1
in.
100
3/4 in.
80-90
4 in.
31⁄2 in.
100
90-100
3% in.
60-80
No. 4
48-65
21⁄2 in.
25- 60
100
No. 8
35-50
2 in.
90-100
11⁄2 in.
3/4 in.
No. 30
19-30
0- 15
35- 70
No. 50
13-23
0- 5
1/2 in.
0- 15
0- 5
100
No. 100
7-15
No. 4
No. 10
80-100
5- 25
0- 5
No. 200
0- 8
base course, but also as the main material of a bituminous surface. As many places in the world are non- productive of stone, the production of pottery aggregates in such a man-
the is often
economical
measure.
ner
most
Pottery-surfacing and
bituminous
paving with pottery aggregates are not great contributions to modern road building methods, but can be instrumental in bringing about rapid development in under-developed areas.
There are three kinds of bitumin- ous surfacing to which pottery ag- gregates can be applied as a main material:
1. Surface treatment. For light traffic, 1 in. in thickness. Pot- tery gradation shown in Table 3.
Pot-
2. Penetration type. For medium
traffic, 2 in. in thickness. tery gradation shown in Table
4.
3. Hot-mix type. For heavy traffic. 3 in. in thickness. Grading requirement shown in Table 5.
Table 3. Pottery Gradation Required For Bituminous Surface Treatment
Application
Per cent of Pottery Aggregates passing sieve size
14 in. 1 in. 3⁄4 in. 1⁄2 in. No. 4, No. 10
Conclusion
The production of pottery aggre- gates involves no difficulty. Sampling indicates its suitability not only as a
123000
-STABILITY → (LBS)
#2200
2100
2000
1900
-1800
1700
2180
70 75 80 85 90
%HAO BYWTHOF AGGE
First course
100 85-100 25-45 0-20 0-5
22
Second course
100 65-90 0-10 0-3
Third course
100 10-35 0-3
201
For the surfacing of these three types, the construction procedure and
16.3%
the bituminous material required
should be commensurate
with
standard construction manuals.
Roll-
ing however can only be done by eight-ton roller and back-rolling is absolutely necessary after the road is open to traffic.
FLOW (1/100
ᄒᄒ
181
16:
14
Table 4. Pottery Gradation Required For Bituminous Penetration Surfacing
Total passing, % by wt. Course Inter-
Fine
Sieve size
mediate
aggregate
aggregate aggregate
22 in.
100
2
in.
85-100
1.
1/2 in.
1 in.
45- 75
0- 25
3/4 in.
100
85-100
1/2 in.
0- 5
100
90-100
3/8 in.
20- 55
40- 75
No. 4
0- 10
5- 25
No. 10
0- 3
0- 3
VOIDS
FILLED
10
70
100
901
90
75 80 85 % AC BY WT. OF AGG.
16.5
+803
703
#60%
$50
40
PERCENT
AGGREGATE
PERCENT VOIDS
TOTAL MIXI
ප
140
-139-
139H
138
137
136
UNIT WEIGHT PCF
135
70 75
80 85 90
+
AC BY WT.OF AGG.
4.7
70
75
80 185 90 %EAC BY WT.::OF AGG.
Fig. 1. Test property cur- ves for hot-mix design data by the Marshall method
70 75: 80 85 90 %AC BY WT OF AGG,
Far East Architect & Builder August, 1967