COMPAC
COMPAC
• Residential • Commercial • Governmental • D.O.T.
KEYSTONE®
Classic Keystone, Natural Appeal
Product Specs
COMPACIII
COMPACIII
KEYSTONE®
Approximately 65-70 lbs
KEYSTONE®8"h x 18"w x 12"d
Compac IIITri-plane
Victorian
Straight Split
Cap Unit
Universal Cap
4"h x 18/12"w x 10.5" d
50 lbs
Keystone Compac units are made of high-strength, low absorption concrete for long lasting structures. All structural units are
interconnected using high strength fiberglass pins for strong shear connection. The connecting pins allow for ease of unit alignment
and a secure positive mechanical connection with soil reinforcement materials. Keystone’s patented pin system is the critical difference
providing the safety and security of a structural retaining wall solution.
Compac Specifications
COMPRESSIVE STRENGTH: ABSORPTION:
REFERENCE STANDARDS:
Minimum 3000 psi
8%
ASTM C-1372
Fiberglass Pin Specifications
FLEXURAL STRENGTH:
Minimum 128,000 psi
SHORT BEAM SHEAR STRENGTH:
Minimum 6400 psi
REFERENCE STANDARDS:
ASTM D-4476, ASTM D-4475
Keystone Fiberglass Pins
*Note: Unit colors, dimensions, weight, and availability varies by manufacturer.
It makes the.
difference
Pin
Keystone Connection
2
Keystone Compac
www.keystonewalls.com
Step 1
Install the Base Course.
Place the first course of Keystone units end to end
(with face of wall corners touching) on the prepared
base. The receiving pin holes should face upward, as
shown. Make sure each unit is level. Leveling the first
course is critical for accurate and acceptable results.
Keystone recommends minimum embedment depth
for below grade placement of Keystone units on a
ratio of 1" (25mm) below grade for each 8" (200mm)
of wall height above grade or one unit, whichever is
greater.
Step 4
Step 3
Prepare the Base Leveling Pad.
After selecting the location and length of the wall,
excavate the base trench to the designed width
and depth. Start the leveling pad at the lowest
elevation along the wall alignment. Step up in 6 or 8"
(150-200mm) increments with the base as required
at elevation change in the foundation. Level the
prepared base with 6" (150mm) of well-compacted
granular fill (gravel, road base, or ½" to ¾" [10-20mm]
crushed stone). Compact to 95% Standard Proctor
or greater. Do not use PEA GRAVEL or SAND for
leveling pad.
Step 2
Installation Instructions, Features and Benefits
Insert the Fiberglass Pins.
Place the appropriate fiberglass pins (straight or
shouldered) into the holes
of each Keystone unit as required.
Once placed, the pins create an automatic setback
for the additional courses. According to wall
requirements and design, place pins in the front
holes for near vertical (1⁄8" or [3mm]) setback and
the rear holes for 1¼" (32mm) setback per course.
Install Fill & Compaction.
Once the pins have been installed, provide ½"-¾"
(10-20mm) crushed stone drainage fill behind the
units to a minimum distance behind the tail of one
foot (300mm). Fill all open spaces between units and
open cavities/cores with the same drainage material.
Proceed to place backfill in maximum 6-8” (150200mm) layers and compact to 95% Standard Proctor
with the appropriate compaction equipment.
Drainage and Geogrid Reinforcement may be
required components on your project. Please consult
your Sales Professional regarding these products.
Features & Benefits Ease of Installation
•T
apered sides offer ease in
constructing radii.
•S
horter tail design, makes for easier
handling in the field.
•T
riangular pin connection hole
allows for installer-friendly
construction adjustments.
Aesthetics
•V
ariety of colors complement any
landscape.
Step 6
Step 5
• Natural stone appeal.
www.keystonewalls.com
Install Additional Courses.
Place the next course of Keystone units over the
fiberglass pins, fitting the pins into the receiving pin
hole or channel recess of the units above. Push the
units toward the face of the wall until they make full
contact with the pins. If pins do not connect properly
with channel, place drainage fill in the cores to
provide interlock with unit below. Continue backfilling
and building to desired top elevation.
Capping the Wall.
Complete your wall with the appropriate Keystone
capping units. With units dry and clean, use
construction adhesive (Keystone KapSeal™) on the
top surface of the last course before applying cap
units. Backfill and compact to finish grade.
Design Versatility and Performance
•2
0% lighter weight than the Compac II
units, reducing costs while maintaining
structural integrity.
•N
ear vertical or battered setback
options available.
• Higher unit-to-unit shear resistance.
• Increased vertical drainage through
face units.
•O
pen cores allow for gravel interlock
across block interfaces.
• Improves connection strength
between face units and geogrid.
Keystone Compac
3
For more than 25 years, Keystone Retaining Wall Systems LLC has set the worldwide standard
for excellence and innovation within the segmental retaining wall industry. With cutting-edge design, performance and
aesthetics, Keystone has always been a product of the passion and focus of the industry’s top network of professionals.
Together with premier manufacturers, product developers, engineers and sales professionals, we proudly ensure that
Keystone products and services offer the best site solutions for governmental, commercial/industrial, recreational,
public works and residential applications.
Distributed By:
We reserve the right to improve our products and make changes in the specifications and design without notice. The information contained herein has been
compiled by KEYSTONE and to the best of our knowledge, accurately represents the KEYSTONE product use in the applications which are illustrated. Final
determination of the suitability for the use contemplated and its manner of use are the sole responsibility of the user.
Keystone Retaining Wall Systems LLC • A Contech Company
4444 West 78th Street • Minneapolis, MN 55435
(952) 897-1040 • www.keystonewalls.com
©2012 Keystone Retaining Wall Systems LLC