veloped by WRG and sold as a low-temperature

Table 7. Concrete mix design for

specimens tested in Phase 2.

set accelerator. PolarSet was tested in Task 1F, but

its strength performance at 5C did not meet the

Cement type

Portland Type I

preset acceptance criteria. Neither DP nor DPTC

418.6 kg/m3

Cement factor

met the minimum strength requirements at 5C.

1102 kg/m3

Coarse aggregate

PolarSet was carried into Phase 2 as a reference

583.1 kg/m3

Sand

174.6 kg/m3

and became a commercial product during the

Water

course of this project.

defined in ASTM C 143 and ASTM C 403, respec-

Concrete containing the selected admixtures

tively, were measured at room temperature on

and control concrete was mixed, cast at room tem-

perature, and then cured at 5C. Specimens from

mixes containing the selected admixtures.

Two sets of mixtures labeled "A" and "B" were

this concrete were subjected to a series of labora-

tested. They were labeled this way to relate mixes

tory tests geared to characterize specific proper-

that have the same antifreeze admixture and dos-

ties.

age. Table 8 shows that, with proper dosage of the

admixtures, the slump and air content can be con-

Phase 2, Tasks 1 to 6

trolled. These mixtures had slumps of 15 cm 2

This phase was divided into six tasks, each

cm, and air contents of 6% 1%. Table 8 also

testing one relevant parameter. In addition to ad-

mixtures, the concrete used in the Phase 2 tests

shows the setting times for each mixture. By com-

paring these setting times to the control concrete,