DWR_3604541

• Document Type - Guidance Documents: Policy
• Topic: Board of Examiners
• Title: REVOKED POLICY 1991-4: USE OF FLY ASH ADDITIVE IN CEMENT GROUTS
• Document Date: 10/3/2000

STATE
F COLORADO
BOARD OF EXAMINERS OF WATER WELL CONSTRUCTION AND POMP INSTALLATION CONTRACTORS
Division of Water Resources
1313 Sherman Street, Room 818
Denver, CO 80203
Phone [phone]
FAX [phone]
http:11boc.state.co.us
BOARD POLICY NO. 2000-5
Bill Owens
Governor
Revoked, Scroll for additional info Gregg E. Walther
Executive Director. DNR
Hal D. Simpson, P.E.
USE OF FLY ASH ADDITIVE IN CEMENT GROUTS Secretary
DISCUSSION:
At its meeting on June 6, 2000 the Board of Examiners of Water Well Construction and Pump
Installation Contractors reviewed the following policy to determine its compatibility with the
current procedures of the Division of Water Resources and the complaint procedures of the
Board, and the necessity of the policy since adoption of the revised Water Well Construction
Rules(2000):
Policy 91-4; August 20, 1991, Use of fly ash additive in cement grouts
As a result of its review the Board determined that Policy 91-4, requires modification for
consistency with ASTM standards for the use of fly ash. The number of the policy is also
changed in accordance with the sequence of policies recently adopted by the Board.
Fly ash is the residue from the combustion of pulverized coal in steam power plants. Slurry
properties and the resulting grout seal are enhanced by blending fly ash with Portland cement.
Some of the benefits of blending fly ash with Portland cement are:
• lighter slurry densities
• smaller water/cement ratio for a pumpable slurry
• reduced shrinkage and permeability
• reduced heat of hydration
• higher ultimate strength
• increased resistance to chemical attack
POLICY:
Having considered the benefits of using fly ash as an additive to Portland cement, the Board
hereby adopts the following policy:
GLENN A. BODNAR, Denver, JANET BELLIS, Boulder, H. RAY NEWMYER, Mosm; GLENN CLEMENT, Greeley
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