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Section 30-4. Use for projects with FDR–cement.
1. Insert the minimum 7-day compressive strength, at least 300 psi, that is 50 psi more than the compressive strength used to determine gravel factor in design. Do not specify a minimum greater than 500 psi.
Add to the beginning of section 30-4.01D(2):
Develop a mix design for each materials sampling location. The mix design must produce FDR–cement with an unconfined compressive strength from __ psi to 600 psi, determined at 7 days under ASTM D1633, Method A, except:
1. Test specimens must be compacted under ASTM D1557, Method A or B.
2. Test specimens must be cured by sealing each specimen with 2 layers of plastic at least 4-mil thick. The plastic must be tight around the specimen. Seal all seams with duct tape to prevent moisture loss. Sealed specimens must be placed in an oven for 7 days at 100 ± 5 degrees F. At the end of the cure period, specimens must be removed from the oven and air-cooled. Duct tape and plastic wrap must be removed before capping. Specimens must not be soaked before testing.
2. Insert the anticipated number of sampling locations recommended by the District Materials Engineer in the Materials Information Handout. If test pits are required instead of or in addition to cores, edit.
Add between the 3rd and 4th paragraphs of section 30-4.01D(2):
Obtain and test material from at least _____ sampling locations from the existing pavement structure by coring. You may perform additional sampling and testing to optimize the cement content and adjust for varying underlying materials. Determine the exact locations of the sampling locations between wheel paths. Do not sample in the shoulders. Sampling locations must provide sufficient representative material for the mix design.
Add to the beginning of section 30-4.03D:
3. Insert the cement content and dry unit weight indicated by preliminary site investigations or knowledge from previous contracts.
The cement content must be __ percent by dry weight of FDR–cement with a dry unit weight of ___ lb /cu ft, except an increase or decrease in the cement content may be ordered based on your mix design. During progress of the work, if you encounter an isolated area that requires more cement than described in the mix design for that area, notify the Engineer before applying the cement.
4. Use if supplementary aggregate recommended by the District Materials Engineer. Edit the spread rate used to develop the quantity of supplementary aggregate.
Spread supplementary aggregate in compliance with the mix design. Spread supplementary aggregate uniformly over the full roadway surface width. The spread rate must be __ lb/sq yd ± 5 percent.