University of Central Florida
Department of Civil and Environmental Engineering
CES 4702: Reinforced Concrete Structures
Homework #1
1.
List three types of admixtures used in concrete and state specific reasons for using them.
2.
Identify and discuss t
he main factors affecting the compressive strength of concrete.
3.
Discuss the importance of the water

cement ratio in a concrete mix.
4.
How is high

strength concrete typically produced? What is the role of the additional
ingredients used in a high

st
rength concrete mix?
5.
Design a concrete mix to produce an approximate strength of 3 ksi given the following:

structure: concrete pavement

maximum aggregate size: ½ inch

fineness modulus of sand: 3.0

dry

rodded weight of coarse aggregate: 100
lb/ft
3

moisture absorption: fine aggregate = 3.5% ; coarse aggregate = 2.5 %
6.
A concrete mix is designed with proportions 1 : 1.9 : 2.8 by weight.
7 gallons of water per sack of cement is to be used.
Given excess moisture contents of 4% for sand
and 3% for stone,
(a) what is the concrete yield in cubic feet per sack of cement
(b) how much of each constituent material is needed for 50 cubic yards of concrete.
DUE:
January 17, 2001
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