Earthwork (Grading, Excavation and Filling, Foundations)

 

Asphaltic Concrete

 

Reinforcing Steel

 

Concrete Batch Plant

 

Concrete

 

Shotcrete

 

Pre-Tensioned Concrete

 

Post-Tensioned Concrete

 

Masonry

 

Structural Steel and

 

High Strength Bolting

 

Nondestructive Testing

 

Spray-Applied Fireproofing

 

Glu Lam and Truss Joists

 

Shear Walls and Floor Systems Used as Shear Diaphragms

SECTION 5 - CONCRETE

OBJECTIVE

Because so many factors interact to affect the ultimate quality of concrete, it has earned a reputation as one of the most variable of construction materials. To deal properly with all these factors, quality assurance is divided into two easily recognized categories or phases.

The first involves collecting evidence from standard tests to demonstrate that the delivered concrete was produced to the quality specified.

The second involves the enforcement of good construction practices during placement, finishing, and curing to achieve a satisfactory finished product.

These two objectives of quality assurance can best be achieved by qualified special inspectors who diligently exercise judgment in following the duties listed below while under the direct supervision of the materials engineering laboratory.

OBSERVATION DUTIES

A. Documents

1. Review the approved plans and specifications.
2. Verify that the class of concrete ordered is being delivered and conforms to specifications, drawings and/or code requirements.

B. Observation Procedures

1. Check forms for cleanliness and proper treatment prior to placement.
2. Visually estimate the slump of each batch delivered and perform slump tests regularly.
3. Determine concrete temperature, number of mixing revolutions, and/or length of time since batching.
4. Observe placement procedures for evidence of segregation, possible cold joints, displacement of reinforcing or forms, and proper support of embedded items, anchor bolts, etc.
5. Inspect for proper compaction/consolidation.

C. Sampling and Testing Duties

1. Sample and test fresh concrete for the following (or as stipulated by plans and specifications):
   1. Slump
   2. Entrained air
   3. Temperature
   4. Wet unit weight, when required
2. Sample concrete and prepare test cylinders in accordance with ASTM C31.
3. Field sampling and testing of concrete should be performed by a qualified technician, certified as an ACI – Grade I Concrete Field Testing Technician.

D. Reports

1. Submit written progress reports describing the tests and observations made and showing the action taken to correct nonconforming work. Itemize any changes authorized by architect/engineer. Report all uncorrected deviations from plans or specifications.

NOTE: Unless otherwise contracted for, concrete observation may not include verification of reinforcing, other embedded items, form dimensions or alignment, or finishing and curing procedures.

 

 

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