820.01 General
A.Certificate of Compliance. At the time of delivery, submit a certificate of compliance for each car and tank truck of material. In addition to the requirements of Section 106.01 C “Certificate of Compliance ”, provide the following information on each certificate of compliance:
A.Fly ash or Slag source by name of company and location of plant.
B.Gross, tare, and net weight if shipped by truck.
C.Car initials and number or tank truck number.
D.Date of shipment. In addition to the certificate of compliance, supply fly ash or slag test data in the form of a chemical and physical analysis report, prepared by an independent lab, before proceeding with the concrete mix design.
B.Storage Requirements. Provide weather -tight storage fac ilities for the SCM.
C.Material Limitations. When using SCM, choose a material type and class for inclusion in the mix design.
820.02 Fly Ash
A.General. The available alkalies, or equivalent, as Na 2O, max percentage is 2.0. If the available alkalies percentage is above 2.0 percent, determine the alkali -silica reactivity according to ASTM C 1567. If the expansion is less than 0.10 percent at 16 days, the material will be accepted. Submit results of the ASTM C 1567 test with the Certificate of Compliance for cement. Provide results from tests performed no more than one year before the date of certificate submission.
B.Class F Fly Ash. If using fly ash, use fly ash from an electrical generating plant using a single coal source not using limest one injection. Use fly ash that meets the requirements of AASHTO M 295, Class F, with the following modifications:
A.Revise “Silicon Dioxide (SiO
2.plus aluminum oxide (Al 2O3) plus iron oxide (Fe 2O3), min percent” to 66.0.
B.Revise “Loss on ignition, max percent” to 2.0.
C.The silicon dioxide (SiO 2) shall be at least 40.0 percent by dry weight of the total fly ash composition. 427 Before developing the concrete mix design, submit fly ash test data prepared by an independent lab. Include a chemical and physical analysis report with the test data.
C.Class C Fly Ash. If using fly ash, use fly ash from an electrical generating plant using a single coal source not using limestone injection. Use fly ash that meets the requirements of AASHTO M 295, Class C.
820.03 Slag
If using slag, use slag cement that meets AASHTO M 302, Grade 100 or Grade 120. Section 822 428 SECTION 822 PENETRATING WATER REPELLENT
822.01 General
Submit a Certificate of Compliance for the penetrating water repellent. Provide a penetrating water repellent treatment solution that consists of an organosilicon compound dissolved in a solvent carrier that, when applied, produces a hydrophobic surface covalently bonded to concrete. Use an Alkyl -Alkoxysilane organosilicon compounds: Provide a solution meeting the following requirements: - Solvent carrier leaves less than 1 pe rcent residue upon evaporation; - Contains 100 percent active solids; - Certified to meet or exceed the performance criteria listed below based on a single application of the solution according to the manufacturer’s recommended rate of coverage; - Does not stain, discolor, or darken concrete; - Application does not alter the surface texture or form a coating on concrete surfaces; - Compatible with the use of special surface finish texture coatings as specified; and - Treated concrete is surface dry a maximum of 4 hours after application.
822.02 Testing
Provide a repellent that, when applied to concrete meets the following requirements:
A.Absorption. Test Duration Max. Absorption Method Water Immersion 48 hours 1% by weight ASTM C 642 50 days 2% by weight ASTM C 642
B.Chloride Ion Penetration.
C.Scaling Resistance to Deicing Chemicals. Test Duration Max. Absorption Method Salt Water Ponding1 90 days 0.75 lb per yd3 AASHTO T 259 Depth: 0.5 inch to 1 inch AASHTO T 260 1 Based on non- abraded specimens. Test Duration Visual Rating Method Salt Water Ponding 50 Cycles 0 at 25 cycles ASTM C 672 ≤ 3 at 50 cycles ASTM C 672
Source: North Dakota Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 461–462 of 550.