WISCONSIN FIELD OFFICE TECHNICAL GUIDE

450-11-TECHNICAL GUIDE

FOTG NOTICE WI-79

SUBJECT:  WISCONSIN FIELD OFFICE TECHNICAL GUIDE

Purpose.  Revisions to Wisconsin Conservation Practice Standards and Specifications

Explanation of Changes.

Section IV: Conservation Practice Standards and Specifications:

Concrete (WCS 4) – Current changes include the following:

• Design of the Concrete Mix

o   Modified to bullet formatting

o   Removed reference to any minimum compressive strength in the specification.

o   Modified design slump to a maximum not to exceed 5 inches with water reducers.

o   Modified design slump language to a maximum not to exceed 8 inches with super-plasticizer.

• Mixing

o   Allowed for additional water above the design mix, but not to exceed 0.45 at any time, including the addition of water at the site.

• Placing, Consolidating, and Finishing Concrete

o   Added requirement for daily data including: The ambient temperature, relative humidity, and wind velocity when concrete is placed.

• Placement

o   Modified language of the slump of placed concrete to a maximum not to exceed 5 inches with the use of water reducers.

• (i.e. no placement of concrete over 5 inch slump.  ASTM C-94 tolerance is 5 inches and less)

o   The slump of the placed concrete shall not exceed the maximum slump of 8 inches with the use of super-plasticizer.

• Editorial Changes for Clarification

The following revisions to the Wisconsin FOTG have been posted on the Wisconsin e-FOTG website:

Remove the following outdated Standards and Specifications from any printed copies of the WI FOTG:

• Index
• Concrete (WCS 4)

Add the following Standards and Specifications to any printed copies of the WI FOTG:

• Index
• Concrete (WCS 4)

A link to the Wisconsin FOTG is located on the Wisconsin NRCS website at:

http://www.nrcs.usda.gov/wps/portal/nrcs/main/national/technical/fotg/

/S/

JIMMY BRAMBLETT

State Conservationist

• FOTG Update: WI-79