Microsoft Word 7- part d doh test Methods doc

3. TEST SPECIMEN REQUIREMENTS 
3.1 Test specimens must be of consistent size and shape.
3.2 Compression test specimens shall be cylindrical, with a length equal to twice the diameter. 
3.2.1 Standard cylindrical specimens shall be 6" (15 cm) in diameter by 12" (30.5 cm) 
length if the coarse aggregate does not exceed 2" (50 mm) nominal size.
3.2.2 Smaller test specimens shall have a ratio of specimen diameter to maximum size 
aggregate ratio no less than 3 to 1.
3.2.3 The diameter of the specimen shall not be less than 3" (76.2 mm) (for mixtures 
containing aggregate for which more than 5% of which is retained on a No. 4 (4.76 
mm) sieve.
3.2.4 For concrete containing aggregate larger than 2" (50 mm), the cylindrical specimens 
shall have a diameter at least 3 times the maximum nominal size of aggregate.
3.3 Standard length of flexural specimens shall be 21" (53 cm), however other lengths may be 
permitted. 
3.3.1 Flexural Test Specimens shall have a cross section that is no less than 6" x 6" (15 cm 
x 15 cm) for coarse aggregate 2" (50 mm) and under in nominal size.
3.3.2 For larger coarse aggregate, the minimum cross-sectional dimension shall be no less 
than 3 times the maximum nominal size of the coarse aggregate.
4. SAMPLING CONCRETE 
4.1 Samples of concrete for test specimens shall be taken in accordance with DOH 10, Sampling 
Fresh Portland cement concrete. 
5. PROCEDURE FOR TESTING SLUMP AND AIR CONTENT 
5.1 Slump – The slump of each sample of concrete from which specimens are to be made shall 
be determined immediately after sampling in accordance with the provisions of AASHTO 
T119. Concrete used in the slump test shall be discarded. 

---

D-29 
5.2 Air Content – Air content, when required, shall be determined in accordance with the 
requirements of AASHTO T199M. Concrete used for determination of air content shall be 
discarded. AASHTO T199M may be used as a rapid check. Air content may also be 
determined in accordance with the requirements of AASHTO T121, Weight per Cubic Foot, 
Yield, and Air Content (Gravimetric) of Concrete.