Underground Infrastructure - January 2023 - 30

REHABNEWS
Avanti Adds Grouts to NSF/ANSI/CAN 61 Certifi ed
Product Line
Avanti International's AV-150
Acrylate Gel and AV-278 Low
Vis Hydro are now certifi ed by
the Water Quality Association
(WQA), as being tested and
certifi ed in compliance with
NSF/ANSI/CAN 61 Drinking Water System Components.
" These products join other Avanti grouts that have earned the potable
water certifi cation, " said Roger Borremans, technical director. " The rigorous
tests they are put through by WQA, per the NSF/ANSI/CAN 61 standard,
ensures the products are safe to use near drinking water sources. "
Avanti also points out that NSF 61 certifi cation is vastly diff erent from
self-proclaimed " compliance. "
Following are details about the latest in a growing list of such Avanti
products.
AV-150 Acrylate Gel is a low-viscosity, chemically activated acrylate
gel. This high-solids grout can permeate most geologies and cures
within a controllable timeframe of 20 seconds to ±5 minutes. Once
cured, it creates an eff ective, strong, long-lasting water barrier while
providing superb soil stabilization.
Specifi c characteristics and features include:
* Stops water infi ltration into manholes, sanitary and storm sewer
mainlines, joints, laterals, tunnels, mines, and various other geotechnical
applications and underground structures, by stabilizing external substrate
* Ground modifi cation/slope stability for prevention of landslides,
erosion, or any place where site conditions or project requirements
dictate modifi cation of the existing soil properties
* High-solids content
* Controllable reaction times, from seconds to minutes
* Available in 44-pound pails, 484-pound drums, and 2,420-pound totes
AV-278 Low Vis Hydro is a moisture-activated, MDI-based
polyurethane. The chemical reaction is catalyzed by mixing AV-279
Low Vis Accel with AV-278 and injecting it as a single component. AV-278
uses moisture as an initiator and is designed with soil permeation in mind.
Its low viscosity allows for soil penetration and its high-expansion
properties fi ll voids, stop active or potential water leaks, and stabilize
soils. AV-278 withstands wet/dry cycles and forms a dense, closed-cell,
impermeable semi-rigid foam.
Specifi cs include:
* Fills voids on the exterior of below-grade structures
* Stops leaks in below-grade structures
* Low viscosity allows for excellent permeation
* Free rise expands 4,000-6,000%
* Withstands wet/dry cycles
* Controllable reaction time by adjusting AV-279 catalyst volume
* Multiple packaging variations available:
8.0- x 2.0-fl uid-ounce barrier cartridges (case of 12)
25.3- x 2.5-fl uid-ounce dual cartridges (case of 6)
8-poud containers
44-pound pails
484-pound drums UI
FOR MORE INFORMATION
Avanti International, (800) 877-2570, avantigrout.com
30 JANUARY 2023 | UndergroundInfrastructure.com
New Chemical Grout Injection Technology
Injecting chemicals to stabilize,
lift, seal or compact weak
soils and rocks is not new.
Polyurethane grout material
has been used for this purpose
since the 1960s. However, the
limitations of this process, to
shallow depths of 20 feet or
less, have often been frustrating,
not only for asset owners
but installers, as well.
As the material is injected,
it begins to synthesize (cure)
inside the injection tube.
While the synthesis rate can
be accelerated or retarded by
controlling the chemical temperature, that control is short-lived.
The deeper or longer the injection tube, the longer time the chemical has
to cure before exiting the tube. While this is happening, the diameter of the
injection tube eff ectively shrinks in diameter, as the cured material bonds to
the tube wall. Another side eff ect is that the chemical being injected can lose
its desired eff ect the deeper it is injected, as it cools once leaving the tube.
This frustration is being abated by Deep Horizons Injection Grouting
(DHIG). Developed by Polymer Technologies Worldwide Inc. (PTW), this
innovative system of injecting chemical grout has been successfully applied
up to 100 feet below ground surface, without foreseeable limitation.
The injection system for the DHIG chemical is like any other, in that
pumps feeding the chemical must be powerful enough to overcome the
strength of the soil materials, as well as any line friction.
The signifi cant advantage of the DHIG technology is that the material
is combined at the tip of the casing, which allows for full material strength
to occur where needed, versus inside the feed line, which is standard
practice using most existing systems.
Another benefi t is that the material can be injected from a lateral point,
to avoid interference with nearby surrounding project activity. This results
in reduced time, cost and impacts to the public and the environment.
For example:
* A leaking cross drain can be sealed without closing down a
busy highway or interstate system.
* A sanitary lift station can remain in operation while a leaking
infl uent line is sealed.
* A building can remain in operation while a basement wall is sealed.
* A leaking earthen dam can be sealed without lowering water levels.
* Retaining walls can be sealed at depth, without excavation or injection
from the face, which can further weaken the wall.
* Stabilizing embankments - bridges, railroads, roadways, canal banks, etc.
* EPA-related concerns such as underground oil, frack well, hazmat or
radioactive leaks at any depth can be sealed, preventing catastrophic
contamination of surrounding freshwater aquifers or ecosystems.
* Sealing abandoned wells and mine shafts, while allowing for future
material removal so that the well or shaft can be put back into service. UI
FOR MORE INFORMATION
Polymer Technologies Worldwide Inc., polymertechnologiesus.com
http://www.avantigrout.com http://www.polymertechnologiesus.com http://www.UndergroundInfrastructure.com
Underground Infrastructure - January 2023

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