ASTM C94-b:16 pdf download

ASTM C94-b:16 pdf download.Standard Specification for Ready-Mixed Concrete.
6.1.2 Slump. or slumps, desired at the point of delivery (see Section 7 for acceptable tolerances),
6.1.3 Slump flow, or flows, desired at the point of delivery (see Section 7 for acceptable tolerances),
6.1.4 Total air content at the point of delivery for concrete that will he exposed to cycles of freezing and thawing or anticipated exposure of the concrete (see Section 8 for sampling for air content tests and tolerances).
Nom 5—Table I provides total air contents for concrete that vary by exposure condition and aggregate size. Total air contents less than those shown in Table I may he specified or used for concrete that is not subject to freezing and thawing. This may he done to improve workability and cohesiveness, reduce the rate of bleeding, reduce the waler content for a given consistency. or achieve required lightweight concrete density. Specified total air contents higher than those shown in Table I may reduce strength without any further improvement of durability.
Exposure conditions for freezing and thawing environments in Table I correspond to the following:
Moderate Evposu re—Concrete exposed to freeze-thaw cycles hut not in contact with the ground or with limited exposure to water, limiting the ability to cause saturation of a portion of the concrete prior to freezing. The concrete shall not receive deicing salts or other aggressive chemicals. Examples include: exterior beams, columns, walls, girders, footings below the frost line, or elevated slabs where application of deicing salt is not anticipated. The air content requirements for this exposure are consistent with those for Exposure Class Fl of ACt 318.
Severe Exposure—Concrete exposed to freeze-thaw cycles while in contact with the ground or with frequent exposure to water, potentially causing saturation of a portion of the concrete prior to freezing. The concrete may receive deicing chemicals or other aggressive chemicals. Examples include: pavements, bridge decks, curbs, gutters, sidewalks. canal linings, or exterior water tanks or sumps. The air content requirements for this exposure are consistent with those for Exposure Classes F2 and F3 of ACI 318.
6.1 .5 Which of Options A, B, or C shall he used as a basis for determining the proportions of the concrete to produce the required quality.
6.1.8 If desired, any of the optional requirements of Table 2 in Specification Cl 602/Cl 602M.
6.1.9 Purchaser shall state any drum revolution limit as to when the concrete discharge must begin. If no drum revolution limit is stated by purchaser, the manufacturer shall determine and communicate the limit to the purchaser prior to delivery.
6.2 If a project specification applics, the order shall include applicable requirements for the concrete to be produced in compliance with the specification.
6.3 If the type, kind, or class of cementitious materials in
5.2.1 and 5.2.2 are not designated by the purchaser, it is permitted to use cementitious materials in concrete mixtures that will satisfy the concrete properties and other requirements of the purchaser as ordered.