Special-Uses-Alkali - Expanded Shale & Clay

eplacement of portland cement should be by fly ash and the rest of the replacement fly ashshould be for the fine aggregate.3.10. TexasMetakaolin is specified under ASTM C 618 as a Class N natural pozzolan. The admixture mustconform to all the chemical and physical requirements and the specifications below provided inTable 5. The fly ash will be subject to sampling and testing throughout the project to determineits conformance with the standards.Table 5. Metakaolin additional specifications.Item Limit (%)SiO 2 + Al 2 O 3 + Fe2O 3 minimum 85.0Alkali maximum 1.0LOI maximum 3.0Maximum amount retained on 45-μm sieve 1.0Strength Activity Index of control, 7 days 85Increase of mortar bar shrinkage at 28 days, maximum 0.03Density of last ten samples, average percent deviation should not exceed 53.11. UtahNatural pozzolans must conform to ASTM C 618 Class N. ASTM C 1260 testing must also showjob aggregate and job cement expansion is less than the Utah Department of Transportationapproved Class F fly ash with the same job aggregate and cement.3.12. WisconsinMetakaolin must conform to specifications of ASTM C 618 Class C fly ash, however thematerial definition of origin will not apply. The material must be from an approved supplier onthe department’s approved product list. The supplier must have an in place quality managementprogram, where daily testing is performed to determine uniformity. This will include testing thespecific gravity, percent retained on the No. 325 sieve, LOI, moisture content, and the activityindex.16