|
To compute the cost of a
reinforced concrete beam for the competition, use the following cost estimates
and procedure. There is no cost associated with shear reinforcement.
| Material |
Cost |
| Portland Type I cement |
$150/ton |
| Coarse aggregate |
$18/ton |
| Fine aggregate |
$10/ton |
| Steel reinforcement |
$700/ton |
| Admixtures - water reducer |
$15/gal |
| Admixture - silica flume |
$500/ton |
| Fiber reinforcement |
Market value (see Dr. Camp) |
The cost of steel may be estimated as follows:
where As is the cross-sectional area of steel
rebars, L is the length of the steel rebars, and 490 lb./ft.3
is the unit weight of steel. For example, if one #5 rebar in placed in the beam
the steel cost is estimated as $0.92.
Consider the following mix for a cubic yard (yd3) of concrete developed using
the ACI mix design procedure.
| water |
304 lb |
| cement |
708 lb |
| coarse aggregate |
1,824 lb |
| fine aggregate |
1,131 lb |
The cost of the concrete required for a 4 in. by 6 in. by 30 in. beam
is estimated as:
The cost of the concrete for this beam is $1.16; the total cost of the
reinforced concrete beam is estimated as $2.08.
This website was originally
developed by
Charles Camp for
CIVL
1112.
This site is maintained by the
Department of Civil Engineering
at the University of Memphis.
Your comments and questions are welcomed.
|
