ETL 1110-1-177
31 Dec 96
b.
Mixing.
(1) The equipment needed to effectively mix the resin
modified pavement grout includes a laboratory mixer equipped with
a wire whip mixing attachment and approximately 10-L-capacity
mixing bowl, a calibrated set of weight scales, and various small
containers to weigh and transfer mix water and resin additive.
(2) Place dry ingredients into mixing bowl and adjust the
bowl height so that the wire whip is just off of or touching the
bottom and sides of the bowl. Begin mixing the dry ingredients
at a slow speed and immediately add the appropriate amount of
water. Once all of the water is added, speed up the mixer to a
point where the grout is being thrown onto the sides of the
mixing bowl. Mix the grout at this high speed for 5 minutes,
then add the appropriate amount of resin additive. Mix the grout
again at a high mixing speed for an additional 3 minutes before
testing for Marsh Flow viscosity.
c.
Viscosity testing.
(1) The equipment needed to measure grout viscosity
includes a Marsh Flow Cone (Figure 1), a 1,000 mL glass or clear
plastic graduated cylinder beaker, a 1,500 mL (approximately)
empty beaker or bucket, and a stopwatch. Have this equipment set
up near the mixing bowl before the end of the 8-minute grout
mixing time.
(2) Immediately after mixing the grout, transfer the grout
from the mixing bowl to the empty beaker or bucket. Take note of
any lumps of material or excess sand in the bottom of the mixing
bowl. (Excess lumps indicate inadequate mixing and render the
grout useless for viscosity testing.) Immediately fill the Marsh
Flow Cone with about 1,100 mL of grout. (A consistent head of
grout in the flow cone is achieved for all viscosity tests by
marking an 1,100 mL fill line inside the flow cone.) The flow
cone outlet is plugged by simply placing one's finger over the
outlet opening. Immediately after the flow cone is filled to te
1,100 mL fill line, position the cone over the 1,000 mL graduated
beaker. Release the grout opening and start the stopwatch timer
simultaneously. Measure the time of flow for 1 L of grout from
the flow cone to the nearest tenth of a second.
B-5
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