2016-01-18_REPORT - M1977493

• Permit No: M1977493
• IBM Index Class Name: REPORT
• Doc Date: 1/18/2016
• Doc Name: Asbestos Disposal Shaft Closure Report
• From: Climax Molybdenum
• To: DRMS
• Email Name: ECS
• Media Type: D
• Archive: No

SPECIFICATION NUMBER:
��� Molybdenummax CONCRETE CONSTRUCTION 03 30 00 SPE
A Freeport-McMoRan Company TECHNICAL SPECIFICATION PROJECT NAME:
CAVR Shaft Closure Project
1. The thickness of the concrete covering over steel reinforcement shall not be
less than the diameter of the round bars and not less than the distance
indicated in ACI 318 unless noted otherwise on the Design Drawings.
J. Supports
1. Reinforcement shall be securely held in position by spacers, chairs, or other
approved supports. The type, number and spacing shall conform to ACI
315. Supports shall be plastic tipped where the finished concrete will be
exposed.
2. Reinforcement shall be securely tied at intersections and splices,as required
by the CRSI "Manual of Standard Practice for Reinforced Concrete
Construction", to maintain their position during work by other trades and
during concrete placement. Tying shall be done using black annealed wire,
with wire tie ends pointing away from the form. Tack welding of
reinforcing steel or of reinforcing steel assemblies shall not be permitted.
K. Depositing Concrete
1. Concrete shall be conveyed and placed as rapidly as practical, either by
manual or mechanical means, that will prevent the segregation or loss of
ingredients. No aluminum material shall be used to convey or place
concrete. Concrete shall be deposited continuously in horizontal layers, in
a manner to prevent displacing reinforcement and the accumulation of
concrete on the forms or the reinforcement above the level of fresh concrete.
Concrete that has attained its initial set or otherwise becomes unsuitable for
placement, as established by the Engineer in accordance with ASTM C94,
shall not be placed in the work.
2. Chuting of concrete shall be permitted only upon approval by the Engineer.
Chutes shall be of rounded cross-section to avoid accumulation of concrete
in corners. The slopes of chutes shall be steep enough to permit flow
without requiring a slump greater than that specified or required for
placement (slope is usually 1 vertical to 2 or 2-1/2 horizontal). In
intermittent operations, when free movement of concrete in the chute is not
possible, discharge the material from the chute into approved hoppers.
Thoroughly clean all chutes and hoppers before and after each run. Wash
water and debris shall be discharged outside of forms.
3. Where concrete is conveyed and placed by mechanically applied pressure,
the equipment shall be suitable in kind and adequate in capacity for the
work. The operation of the pump shall be such that a continuous stream of
concrete without air pockets is produced. When pumping is completed, the
concrete remaining in the pipeline shall be ejected in such a manner that
114-910345 CONCRETE CONSTRUCTION
Climax CAVR Shaft Closure Project 03 30 00 SPE-17