Lightweight Concrete for High Strength - Expanded Shale & Clay

Table 3.5 Chloride Permeability -- Charge Passed Through Laboratory 56 Day ACC Specimens
Mix
Mix A
Mix B
Mix C
Specimen
Prooveit read
charge passed for
4-in. specimen
(coulombs)
Corrected charge
passed for 3.75-
in. specimen
(coulombs)
Chloride
Permeability
determined by
ASTM C 1202-97
Table 1
1 717 630 Very Low
2 703 618 Very Low
3 703 618 Very Low
4 701 616 Very Low
Mean 706 621 Very Low
1 418 367 Very Low
2 395 347 Very Low
3 641 563 Very Low
4 262 230 Very Low
Mean 429 377 Very Low
1 389 342 Very Low
2 121 106 Very Low
3 119 105 Very Low
Mean 210 184 Very Low
3.3 Field Investigation
Field specimens were made on two separate occasions. In the first field mixing session,
specimens were made from Mix A, Mix B, and Mix C in order to examine field batching and
quality control procedures and to place all comparative cylinders and beams from a single batch.
The specimens made for testing included 4x8 cylinders for compressive strength, 6x12 cylinders
for modulus of elasticity, 4x4x14 prismatic beams for modulus of rupture, 4x8 cylinders for
chloride permeability, and 12-in. x 20-in. x 36-in. (HxWxL) blocks for cored-cylinder strength
tests. In the second session of field mixing, section 6.3, Type II AASHTO girders were made
(Task 5). The concrete property specimens included 4x8 cylinders, 6x12 cylinders, and 4x4x14
prismatic beams, 4x8 cylinders for chloride permeability, and 4x15 cylinders for shrinkage,
creep, and coefficient of thermal expansion.
3-7