5
©
Germann Instruments, Inc.
Test Smart – Build Right
©
Figure 3
The Proove´it testing cells.
1.3
ASTM C 1202 using the Proove´it Cell PR-1000
(
See figure 3.a
)
The
Proove’it
©
equipment is designed to perform a rapid and automated electrical indication of the
concrete’s ability to resist chloride ion penetration in accordance with the ASTM C 1202-12
[1]
or AASHTO
T 277-831
[2]
. The unit measures the electrical current passing through a concrete specimen for a period of
standard 6 hours at a standard voltage of 60 V-DC.
The current (in milliamps) is measured over 6 hours and the ampere-seconds are achieved by integration
of the curve in order to obtain the Coulombs. This is done automatically. The Coulombs are, according to
ASTM C 1202, an indication of the concrete’s ability to resist chloride ion penetration for a specimen with
a diameter of 95 mm (3 ¾”), 50 mm long (
See table 1
).
Table 1
Chloride ion penetrability based on charge passed
[1]
.
Coulombs
Chloride Ion
Permeability
Typical of
>4000
4000-2000
2000-1000
1000-100
<100
High
High w/c ratio
Moderate
0.4 - 0.5 w/c ratio
Low
w/c ratio < 0.4
Very low
Latex modified concrete
Negligible
Polymer modified concrete
(a)
The standard PR-1000 cell for ASTM C 1202.
(b)
The PR-1200 cell for ASTM C 1760.
(c)
The PR-1100 cell with cooling ribs
for NT BUILD 492, and RCPT with optional heat reduction.
(d)
The PR-1000-113-20
modified for the French standard XP P 18-461 for 113 mm diameter and
20 mm thick specimens (cooling ribs can also be mounted here).
NOTE
: For stabilization of the temperature of the liquids, the PR-1100 cell with cooling ribs has to be
used. A fan can be positioned in the vicinity of the ribs. Should the temperature measured in the
liquids start rising above a required temperature level, the fan is turned on to enhance the airflow
around the cooling ribs to release the heat from the cells.
(a)
(b) (c) (d)
