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GeoSpec® Lightweight Fill
Ground fill applications where lightweight fill is required

GeoSpec® Lightweight Fill


GeoSpec® lightweight fill material is expanded polystyrene (EPS) geofoam
used in ground fill applications where a lightweight fill material is required to
reduce stresses on underlying or adjoining soils/structures. EPS geofoam
has been used in projects involving roads, bridge approach fills,
embankments, levees, berms, foundations, landscaping, etc., worldwide for
over 50 years.

GeoSpec fill material can be designed to support high compressive loads,
but has a density less than 1% of traditional earth materials. It can be
designed to meet a wide range of geotechnical engineering specifications
with a typical density range of 11 kg/m3 (0.7 pcf) to 40 kg/m3 (2.5 pcf)
providing a range of compressive resistance properties. The table below
provides GeoSpec fill material type designations and material properties
as per ASTM D6817, Standard Specification for Rigid Cellular Polystyrene
Geofoam.






Material Property Test Method Units D6817 GeoSpec Type Designations1
EPS12 EPS15 EPS19 EPS22 EPS29 EPS39
Product Density,
Minimum
ASTM
C303
kg/m3
(pcf)
11.2
(0.70)
14.4
(0.90)
18.4
(1.15)
21.6
(1.35)
28.8
(1.80)
38.4
(2.40)
Compressive Resistance2
Minimum @ 1% strain
ASTM
D1621
kPa
(psi)
15
(2.2)
25
(3.6)
40
(5.8)
50
(7.3)
75
(10.9)
103
(15.0)
Compressive Modulus
Minimum
kPa
(psi)
1,500
(220)
2,500
(360)
4,000
(580)
5,000
(730)
7,500
(1090)
241
(35.0)
Flexural Strength
Minimum
ASTM
C203
kPa
(psi)
69
(10)
172
(25)
207
(30)
240
(35)
345
(50)
414
(60)
Limiting Oxygen Index
Minimum
ASTM
D2863
% 24 24 24 24 24 24
Additional Compressive Resistance Properties3
Compressive Resistance
Minimum @ 5% Deformation
ASTM
D1621
kPa
(psi)
35
(5.1)
55
(8.0)
90
(13.1)
115
(16.7)
170
(25.0)
241
(35.0)
Compressive Resistance
Minimum @ 10% Deformation
kPa
(psi)
40
(5.8)
70
(10.2)
110
(16.0)
135
(19.6)
200
(29.0)
276
(40.0)

1. The material properties for GeoSpec lightweight fill material are third party certified by Intertek.
2. Compressive resistance at 1% strain is within the elastic limit for the GeoSpec types in the above table and is accepted as the design compressive resistance to limit long-term deformation under structural load.
3. Compressive resistance at 5% and 10% strain in the above table are provided for applications where the intended end-use requires long-term deformation under structural load - i.e., a compressible product.