Quality Statndards and Tests for Precast Concrete Wall Panels

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Title: Quality Statndards and Tests for Precast Concrete Wall Panels

Author(s): ACI Committee 533

Publication: Journal Proceedings

Volume: 66

Issue: 4

Appears on pages(s): 270-275

Keywords: absorption; air entrainment; compressive strength; concrete cores; con-crete durability; concrete panels; cubes; discoloration; freeze-thaw durability; impact hammer tests; precast concrete; quality control; specifications; testing; walls.

Date: 4/1/1969

Abstract:
This report emphasizes specification and production control tests and procedures which will simplify and improve the relationship of architects, engineers, prefabricators, and owners, with regard to precast concrete wall panels. Tests for compressive strength and for freeze-thaw durability are discussed. Standard 6 x I2-in. ( 15 x 30 cm) cylinders are recommended for compressive strength samples wherever such procedure is practical. Otherwise, 4-in. (10 cm) cubes are suggested, the test results of which should be reduced 20 percent as an estimate of cylinder strength. Due to past excellent panels, specification of performance and the normal vertical orientation of most wall freeze-thaw testing is not recommended generally. The report recommends that wall panel concretes should be air-entrained without specification of a fixed percentage air content.