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MNL 117.

A.

Quality-Control Testing:  Test and inspect precast concrete according to PCI MNL 117 requirements.  If using self-consolidating concrete also test and inspect according to PCI Interim Guidelines for the Use of Self-Consolidating Concrete.

Delete paragraph and subparagraph below if not required.  PCI certification would normally be acceptable to authorities having jurisdiction without further monitoring of plant quality-control and testing program by Owner.

B.

Owner will employ an independent testing agency to verify architectural precast concrete fabricator’s quality-control and testing methods.

1.

Allow Owner’s testing agency access to material storage areas, concrete production equipment, concrete placement, and curing facilities.  Cooperate with Owner’s testing agency and provide samples of materials and concrete mixes as may be requested for additional testing and evaluation.

C.

Strength of precast concrete units will be considered deficient if units fail to comply with ACI 318 (ACI 318M) requirements for concrete strength.

Review testing and acceptance criteria with structural engineer.  Add criteria for load tests if required.

D.

Testing:  If there is evidence that the concrete strength of precast concrete units may be deficient or may not comply with ACI 318 (ACI 318M) requirements, Precaster will employ an independent testing agency to obtain, prepare, and test cores drilled from hardened concrete to determine compressive strength according to ASTM C 42/C42M.

1.

A minimum of three representative cores will be taken from units of suspect strength, from locations directed by Architect.

2.

Cores will be tested in an air-dry condition.

PCI’s recommendations below are more stringent than ACI’s.

3.

Strength of concrete for each series of 3 cores will be considered satisfactory if the average compressive strength is equal to at least 85 percent of the 28-day design compressive strength and no single core is less than 75 percent of the 28-day design compressive strength.

4.

Test results will be made in writing on the same day that tests are performed, with copies to Architect, Contractor, and precast concrete fabricator.  Test reports will include the following:

a.

Project identification name and number.

b.

Date when tests were performed.

c.

Name of precast concrete fabricator.

d.

Name of concrete testing agency.

e.

Identification letter, name, and type of precast concrete units or units represented by core tests; design compressive strength; type of break; compressive strength at breaks, corrected for length-diameter ratio; and direction of applied load to core in relation to horizontal plane of  concrete as placed.

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