1. 15 points -- Define the following terms (a definition should be no
longer
than ten or twelve words):
a) Calcareous
b) Metamorphic
c) Sand
d) Oven dry
e) Hygroscopic
2) 15 points --To counteract each of the following problems, select
the
appropriate concrete admixture type, the desired effect, and
identify one
specific material of each type :
Problem
a) The concrete is too permeable
b) The concrete is setting up too fast
c) The contractor is having difficulty pumping the concrete mix
d) The concrete is not sufficiently workable for efficient
placement
e) To achieve high strength the concrete water demand must
be reduced 15%
3. 20 points -- Identify the appropriate concrete type for each of the
following applications:
A) Lower stories of a high rise building
B) Airport Runway with drainage runoff problems
C) Modular construction in which forms are reused as soon as
possible
D) Top floors of a high rise building
E) Acoustic shielding in a hospital
For each answer, identify the property of the concrete that makes
it
appropriate and the way the property is obtained in the concrete. For
example, if your answer were "Porous Concrete", the property would
be "high
permeability" and the way it is obtained would be "elimination of fine
aggregate and use of a minimum amount of cement"
4. 20 points -- Using Table 7-6 in the PCA Manual find the requirements
for
water (per cubic yard of concrete) for the following applications:
Aggregate Size Slump Air entrained? Aggregate Type
A) 1 1/2"
1-2
Yes
Gravel with some crushed stone
B) 1"
3-4
No
Subangular
C) 3/4"
6-7
Yes
Gravel with some crushed ston
D) 1/2"
3-4
Yes
Crushed stone
E) 1 1/2"
1-2
Yes
Rounded gravel
5. (10 points) The design of a Portland Cement Concrete mix to achieve
a
specified strength in a specified environment and application depends
upon a
number of factors. Using the logic of the absolute volume (eleven step
method) please answer this question. Does the fineness modulus of the
fine
aggregate affect the amount of fine aggregate required? If so, how
does it
influence the amount of fine aggregate required?
. 20 points -- Calculate the Fineness Modulus for the following
sieve
analysis. Does the sieve analysis conform to the ASTM C 33 requirements?
Sieve size Cumulative % passing
#4
100
#8
85
#16
75
#30
55
#50
25
#100
10
Pan
0