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Unformatted text preview: Calpoly State UniversitySLO Civil & Environmental Engineering CE 221 A . .Mid—term Exam 04/13/2 Name 1 j i a Q. 1 To design a ﬂexible pavement using AASHTO method of design, the structural
number of subgrade, subbase and base layers was determined to be 4.2, 3.1 and 2 1
respectively. The elastic moduli of Asphalt concrete, base layer and subbase layer Were 350,000 psi, 50,000 psi, and 20, 000 psi, respectively. If drainage quality IS
“fair” and pavement sublayers remain saturated 15% of the time, determine the layers thicknesses. .._. {“1 1 M5_  . 4 0. SN' 2' 'l/5Nz ’y‘ SN? 4 2/ 'L SN“: «[31 44102mzt “war‘5 (i. 2 0 DES031$» t]. 3.;
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015’; DmHW‘iMZDPM"“M 0 V\‘ 4.0% ﬁE’ by“ \0 / PALLL—Lﬁu w . . 91‘ £24.; ___‘L 1 5dr [My SN)“: 30;* L.3}§)(iﬁ)t¢/&j 3‘52 a! 1 314:" /? ”F VIE{ii} .; DZ: M _; 51.1. 2.15' u’i,;~'r: “refill Julia 3N1 —SH‘¥ +azim1DZH .
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Q. 2 In cor‘f’dﬁaing a traiﬁ'ggdidy an aerial photo showed 5 vehicles on a 110 meter long
section of a highway. The speeds were measured and were as follows. 55, 60, 65,50 and 62 km/hr. Determine the following: (11) Density (k), veh/l'cm, (b) The ﬂow (q),
veh/hr ,(c) the average time headway (sec) and (d) the distance headway (m). 0 av 12:.  «1“ I 4245121 ‘/
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d) 71 v. 1. {av*4 thaw"dmluwsl 00...... . . :Lzlﬂ m ”’7 Q.3 The following earthwork areas were calculated. The shrinkage ratio for this type of
material was determined to be 11%. Determine the excess ﬁll needed for this project. 20+00 _—
20+60 110.6 21+00 ——
21+55
" 21+90 Tol"F\LL‘ I'f),lUM‘i?>‘“"3
TM curt 8.25mi? m3 Wine, 7_2:_\ we: +3_;ii5$_
all « iﬁﬁimﬂzm we) a $445 ms em, = 15W [55): 23%.2‘5.‘
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Q.4 Determine the minimum radius of a horizontal e require or a 2lane highway if
the design speed is 112 km/h and the superelevation rate is 0.08. If the highway will have the standard lane width, determine the length of transition curve (superelevation runoff). 2:: V?” = Lli2)L ‘, ”ilalﬂalbm ' MBH'TO min €= [055' 511—413 IZIHJI not?)
U: 100 De “1200(5.lp\){.08)"" 5’+.tom —r 30m rL] "an...— .m— (2.5 Given the proﬁle below, determine the length of the vertical curve needed to make
the highest point on the vertical curve come out exactly over the centerline of the
cross road at station 150+70. Also, determine the clearance between the centerline of the cross road and the vertical curve profile. Pl": \504 "to r: ’M5"—l49 = '1 ; r
L L— . gvc«z 9.1+ le. q L L12) 2 Elevation 37.50
43: 110+uletLg(m r , ...
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