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Unformatted text preview: Michigan State University
Department of Civil and Environmental Engineering
CE 337  Civil Engineering Materials (4 credits)
Fall 2007
Test 4 11/9/07
l \ 7 Name:
PID# : No’re : Time allowed is 50 minutes
Maximum points possible 20.
You are allowed to bring one 3” by 5” index card as a “cheat” sheet. All equations and intermediate steps leading the ﬁnal answer must be
clearly shown. Indicate appropriate unit where applicable. 50% points
will be deducted for a given answer if the units are incorrect or missing. > There will be NO partial credit given for any question. CE 337Test 4 l
Fall’07 Question lMultiple choice, True and False and ﬁll in the blanks. (Each correct
response is worth 1/4 pointMaximum points possible = 4. 75). A no response will also be
considered as an incorrect answer. 1. If the 28compressive strength of a PCC cylinder is 3500 psi, estimate the split tensile
strength of the concrete? a) 3500 psi b) 444 si 0.7g:
6 d) 350 psi e) cannot be determined 2. A concrete cylinder 6” in diameter and 12” in length is tested in the IDT mode. The
load at failure was recorded as 40,000 pounds. The indirect tensile strength of the
concrete to the nearest whole number is: am 34951 UL? = 2%4O,cs\m c) 363 psi 7Cx—é 4613»
d) 398 psi
e) cannot be determined 3. If a PCC mixture design requires 611 pounds of cement then the cement factor for this
design is a) 5.5
b) 611 d) 7.5
e) cannot be determined 4. The volumetric composition of a PCC mixture includes 2.5 ft3 of cement, 4 ft3 of water,
12 ft3 of coarse aggregate, 7.5 ft3 of ﬁne aggregate and 1ft3 of air. The mortar factor
(MF) for this mixture is: a) 0.50 M17: 9.91.1 30"?)(0 b) 1.00 (SF—3% ,0” e) 0.44 5. As the coarse aggregate size increases the a) Coarse aggregate factoECREASES for a given ﬁneness modulus of sand.
b) Amount of design air entrainment INCREASESASECREASES ﬁx a given exposure level. CE 337Test 4 2
Fall’07 6. The center point ﬂexural strength of a concrete mixture is 500 psi. The estimated third
point ﬂexural strength of the same concrete is: a 460 si m
c) 500 psi
d) Cannot be determined based on the information provided. 7. In a Bingham ﬂuid, ﬂow can only initiate after the ITS stress has been
overcome by external stimulus. 8. The maximum compressive load carried by a cylinder (6” by 12”) cured for 28days is
130000 pounds. The compressive strength nd elastic modulus of the concrete is W and 5 '&®* 10 F51, respectively. (Appropriate units
need to be sh n). 9. As part of concrete mixture design requirement the design engineer speciﬁes a concrete
compressive strength of 3000 psi. The standard deviation based on 15 strength samples
is 300 psi. The required average compressive strength for this PCC mixture design is 3 4 ea 32 Ea .
10. The unit weight f normal concrete ranges between " l SD lbs/ft3.
11. The stressstrain curve for concrete is nonlinear because Al (2. y'glg _S .
12. Water reducing admixtures are added to concrete for Wacandpw . 13. The three design criteria for entraining air in co rete necessary for effective freeze thaw resistance include ’ AIR. ,
EELE and spAcaHQ . CE 337Test 4 3
Fall’07 Question 2 (6 points) Use the data given below to answer the questions. Show all equations and calculations to
receive full credit. Table 1 — The FCC mixture design (dry weights to produce 1 cubic yard of concrete) is as follows: Table 2 1 D Weihts lbs
Water
Cement Coarse Aggregate
Fine Aggregate
Air (%) ész #492496 VAH’L =y "*olq :. 0.8(46
{0° F’msAcg ‘: Q?! {Q}
CE 337Test 4 4
Fall’07 b) Determine the adjusted weight of the design water (based on stock weights) in
pounds? For this part assume that the dry weight of the coarse aggregate is
2000 lbs and the dry weight of the ﬁne aggregate is 1500 lbs, irrespective of
what you computed in parts (a) and (b). (3 points) CbARSE, ¥Imé
NOD :oqooo Lbs I c) If 10% of the cement as recorded in Table 2 is replaced with ﬂy ash (by weight) then
compute the resulting weight of the ﬁne aggregate (ovendry weight). (Assume
speciﬁc gravity of ﬂy ash is 2.5). For this part assume that the weight of the dry
coarse aggregate is 2000 lbs, irrespective of what you computed in part (a). L_is_t
the effects of this ﬂy ash addition on the fresh and hardened properties of concrete
(cost savings will NOT count as a response). (4 points) wceMelﬂ “ 0‘9+S(C> :4ng
(Nng = 04*le : S‘\"'°‘ \/ = gees $9 Ems
V = 4 2 gal 813
agar/(EMS Mania é.€'3'*éZ'+'¥c>2'éc
VFL. = S‘ i
j Goawed: {033 u;
H084 5
VGA = 4:2 IM?9—<NES (“Ganeshav
denim «lo newt) lHPO—ovLSS LONG It“? 51‘me
a EWQD Pamexcrj VA”; 08'4‘3/ Veep: 4'73 CE 337Test 4
Fall’07 Question 3 (6 points) Draw typical sketches for the relationships or behavior‘ listed below:
a) Compressive strength versus L/d ratio.
b) Tensioncompression curve for the IDT.
c) Bingham behavior of concrete. d) Stressstrain curve for concrete under compression. All sketches should be appropriately labeled and titled. co) CE 337Test 4
Fall’07 ...
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