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:
Climax Molybdenum CONCRETE CONSTRUCTION 03 30 00 SPE
A Freeport-McMoRan Company TECHNICAL SPECIFICATION PROJECT NAME:
CAVR Shaft Closure Project
accomplished immediately after the concrete has been deposited in the
forms. Vibrators should not come in contact with forms, reinforcements or
embedded items.
M. Retempering
1. Water shall not be added to mixed batches of concrete to increase the slump
without specific approval of the Engineer or Owner. When batches
delivered to the job show an unduly low slump (as might occur during hot
weather) consideration shall be given to the use of retarders.
N. Bonding
1. Concrete on which other concrete is placed shall be either still plastic or
thoroughly hardened,but not in a semi-hardened state that may be disrupted
and weakened by the added load and the jarring due to placement of
additional concrete.
2. To provide bond between successive lifts of concrete, the exposed surface
of the hardened concrete shall be cleaned and roughened,without loosening
the embedded aggregate. Brooms or air-water jets shall be used after the
start of initial setting of the concrete. Sand-blasting or air-tooling shall be
employed after the concrete has hardened. In all cases, the surface film and
laitance or diluted paste shall be removed and a reasonably high percentage
of aggregate exposed. Immediately before the new concrete is placed, the
old surface shall be clean, damp and free from standing pools of water.
3. Batches of neat cement or of mortar having about the same proportion of
cement to sand as used in the concrete, or as otherwise specified herein,
shall be deposited and well brushed in,just ahead of the new concrete.
O. Concrete Finishes
1. Use of neat cement to absorb excessive surface water is prohibited.
Application of additional water to facilitate finishing is prohibited.
2. "Float Finish" shall be accomplished by wood, cork, or metal floats or by a
finishing machine. After the concrete has been properly placed, vibrated,
and roughly leveled, it shall be screed off to the proper elevation. Coarse
aggregate shall be tamped below the surface. After screeding and tamping
of coarse aggregate, the surface shall be made uniform by means of a bull
float. After floating, the surface shall be tested for uniformity by use of a
straight edge. Variations from desired finished elevations shall not exceed
1/4 inch in 10 feet.
114-910345 CONCRETE CONSTRUCTION
Climax CAVR Shaft Closure Project 03 30 00 SPE-19