2.1.1.4
[Ground Granulated Blast-Furnace Slag
Ground granulated blast-furnace slag shall conform to ASTM C 989, Grade
[_____].]
2.1.1.5
[Silica Fume
Silica may be furnished as a dry, densified material or as a slurry.
Silica fume, unprocessed, or before processing into a slurry or a densified
material, shall conform to ASTM C 1240.]
2.1.2
Aggregates
Aggregates shall conform to ASTM C 33 with the combined grading of coarse
and fine aggregates conforming to the grading shown below.
PERCENT BY MASS PASSING INDIVIDUAL SIEVES
SIEVE SIZE
GRADING NO. 1
GRADING NO. 2
GRADING NO. 3*
19.0 mm (3/4 in.)
--
--
100
12.5 mm (1/2 in.)
--
100
80-95
9.5 mm (3/8 in.)
100
90-100
70-90
4.75 mm (No. 4)
95-100
75-85
50-70
2.36 mm (No. 8)
80-100
50-70
35-55
1.18 mm (No. 16)
50-85
35-55
20-40
600 m (No. 30)
25-60
20-35
10-30
300 m (No. 50)
10-30
8-20
5-17
150 m (No. 100)
2-10
2-10
2-10
* Fine and coarse aggregates shall be batched separately to avoid
segregation.
2.1.3
Water
Fresh, clean, potable mixing water or nonpotable water which meets the
requirements of COE CRD-C 400 shall be used.
2.1.4
Admixtures
Admixtures to be used, when required or approved, shall comply with the
appropriate sections of ASTM C 1141. Except as otherwise accepted, soluble
admixtures shall be dissolved in water before introduction into the
shotcrete mixture.
2.1.4.1
Accelerators
When accelerating admixtures complying with ASTM C 1141, Type II, Grade 1,
are to be used, the Contractor shall establish the accelerator compatibility
of the job cement and the proposed accelerators using ASTM C 266, except as
modified herein. The powdered accelerator shall be blended with 50 grams
of cement until uniform and 15 milliliters of water shall then be added.
The liquid accelerator shall first be mixed with 15 milliliters of water
and then added to 50 grams of cement. Three percent of the proposed
accelerator by mass of cement shall be used as a starting point. Mixing
shall be accomplished within 15 seconds. The specimen shall be molded
within 1 minute of adding the mixing water. If initial set is 2 minutes or
less and a final set is 10 minutes or less, the accelerator is considered
SECTION 03371
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