4104.01
GENERAL REQUIREMENTS.
A.
Meet the requirements of AASHTO M 182 (10 ounces) except as modified below. Use jute or kenaf fabric that has not been in contact with wool, sugar, molasses, or other substance that might have an objectionable effect on fresh concrete.
B.
In lieu of the minimum weight specified, a sample dried in an oven at a temperature of 215°F to 225°F for 10 minutes weighing no less than 8.0 ounces per square yard will be considered acceptable.
C.
Sew burlap into covers of width sufficient to cover the full width of concrete surface to be covered, plus one foot. In sewing the covers, place all welt seams on the same side of the sheet.
Source: Iowa Standard Specifications for Highway and Bridge Construction, 2023 Edition. Pages 1073–1073 of 1,288.