194(h) Granulated iron blast-furnace slag shall conform to ASTM C989, Grade 100 or 120.
i.Silica fume shall conform to AASHTO M307.
j.Corrosion inhibitor shall contain a minimum 30 percent solution of calcium nitrate or other Department approved material.
k.Metakaolin shall conform to AASHTO M321.
215.03 Detail Requirements
Approved admixture(s) shall be used in concrete in the proportions recommended by the manufacturer to obtain the optimum effect where seasonal, atmospheric, or job conditions dictate its use. The Contractor shall use only admixtures (a) through (e) that appear on the Materials Division Approved Products List. The Department will base its initial approval of such admixtures on indepen - dent laboratory data submitted by the manufacturer verifying conformance to the specific admixture requirements. Thereafter, the manufacturer shall annually provide the Engineer a written certification that the material currently being furnished is identical in both composition and chemical concentrations to that tested by the independent laboratory. The manufacturer shall also supply a certification stating that that the chemical composition of the mate - rial is essentially the same as that of the approved mixture if the Contractor proposes to use an admixture that differs in concentration from the acceptance sample. The Department will permit the use of pump-aid admixtures when the Engineer authorizes placing con - crete by pumping, provided these are used in accordance with the manufacturer’ s recommendations. SECTION 216—W ATER FOR USE WITH CEMENT OR LIME
216.01 Description
These specifications cover water for use in mixing with cement or lime.
216.02 Detail Requirements
Water shall be clean, clear, and free from oil, acid, salt, alkali, organic matter, or other deleterious substances. Water that has been approved for drinking purposes (potable) may be accepted without testing for use in hydraulic cement concrete, cement, or lime stabilization. The Engineer must approve water from other sources as well as pumping methods planned by the Contractor before use. The acidity or alkalinity of water will be determined colorimetrically or electrometrically. Water shall have a pH between 4.5 and 8.5. When subjected to the mortar test in accordance with AASHTO T26, water shall 215.02 195produce a mortar having a compressive strength of at least 90 percent of a mortar of the same design using distilled water. The Engineer will permit the use of wash water from hydraulic cement concrete mixer operations in the concrete mixture provided it is metered and it is 25 percent or less of the total water required. The total water shall conform to the acceptance criteria of ASTM C1602, Tables 1 and 2. The Contractor shall use a uniform amount of wash water in consecutive batches, with subsequent admixture rates adjusted ac - cordingly to produce a workable concrete conforming to the Specification requirements for the concrete mixture. SECTION 217—HYDRAULIC CEMENT CONCRETE
217.01 Description
These specifications cover materials, design criteria, mixing, and testing procedures for hydraulic cement concrete.
217.02 Materials
Hydraulic cement concrete shall consist of hydraulic cement, fine aggregate, coarse aggregate, water, and admixture(s) mixed in the approved proportions for the various classes of concrete by one of the methods designated hereinafter. The Contractor shall be responsible for the quality control and condition of materials during handling, blending, and mixing operations and for the initial determination and necessary adjustments in the pro - portioning of materials used to produce the concrete.
a.Cementitious materials shall be a blend of mineral admixtures and portland cement. In overlay concretes, expansive hydraulic cement is permitted in lieu of portland cement. Portland cement (Types I, II, III), blended cements or expansive cement (Type K) shall comply with Section 214. Blended and Type K cements shall be used only as approved by the Engineer unless otherwise specified. Flyash, ground granulated iron blast-furnace slag (GGBFS), silica fume or metakaolin shall conform to Section 215. The table below lists the minimum percentage of specific mineral admixtures, required by mass, as a portion of the cementitious material depending on the alkali content of the cement. Any other mineral admixture or any other amount or combination of min - eral admixtures may be used if approved by the Engineer. The fly ash content shall not exceed 30 percent for Class F, the ground granulated blast-furnace slag content shall not exceed 50 percent and the silica fume content shall not exceed 10 percent as a portion of the cementitious mate - rial unless approved by the Engineer. Class C Flyash or other mineral admixtures may be used provided the Contractor demonstrates that the percent usage of Class C Flyash or other mineral admixtures have a maximum expansion of 0.15% at 56 days according to ASTM C227 using borosilicate glass as aggregate. Minimum percent mineral admixtures required by mass of cementitious material as a portion of the total cementitious materials and is based upon the alkali content of the cement in accordance with the following:217.02
Source: Virginia Road and Bridge Specifications, 2020 Edition. Pages 222–222 of 1,065.