IN COMPLIANCE WITH ASTM D 3753, STANDARD SPECIFICATION
FOR GLASS FIBER-REINFORCED POLYESTER MANHOLES
Summary:
Separate tests were conducted on 48" cylinder internal diameter and 42" cylinder internal diameter Containment Solutions Fiberglass Manholes, each with a cone reducer of 22-1/2" internal diameter. Test samples used were actual pieces of manhole or samples manufactured in a manner consistent in every way with the manhole component construction. While Containment Solutions attempts to manufacture fiberglass manholes uniformly, properties of individual manholes may vary somewhat from those measured in these tests, but should always meet or exceed ASTM D 3753 standards
Results were as follows:
1. All workmanship requirements were met without any repair.
2. Dimensions of the manholes were as follows:
- Cylinder internal diameter - 48 inch, 42 inch
- Cylinder length - 3 feet
- Cone opening diameter - 22.5 inches
3. The manhole met all loading requirements with no leakage or other evidence of damage before or after load testing.
4. The manhole cylinders met all stiffness requirements of specification.
5. Chemical resistance requirements were exceeded by the constructions used in both the cone and the cylinder of the manhole.
6. Material properties have been established for the truction of the manhole cone and cylinder.
Testing Requirements:
- Load Rating Test: Method of test explained in ASTM D 3753, section 8.4.1.1 for concentric manholes. (See Figure 1) The finished manhole (minimum 36 inch cylinder length) is loaded vertically with cover and supporting ring installed. Load is applied eccentrically in 2,000 lb. increments with close visual inspection at each increment and deflection measurement. Deflection in this testing is measured with low intensity lasers, to a 24,000 lb. load. The load is increased to 40,000 lb. and the complete manhole shall not leak, crack or suffer other damage.
Refer to Table 1 for results.
- Cylinder Stiffness: The cylindrical portion of the le is to be tested in accordance with ASTM Method D 2412. The specification stiffness requirements are included in the test table of this report.
Refer to Table 1 for results.
- Soundness: In order to determine soundness, an air or water test is to be applied to the manhole test sample. While holding the pressure between 3-5 psi, the entire manhole must be inspected for leaks.
Refer to Table 1 for results.
- Chemical Resistance per ASTM C 581: Flexural strength, flexural modulus and barcol hardness are plotted versus time on log-log coordinates. The line defined by these points is extrapolated to 100,000 hours. The minimum extrapolated retention allowed for any of these properties is 50%. Test samples used are actual pieces of manhole or samples manufactured in a manner consistent in every way ith the manhole component construction.
Sulfuric acid was used to simulate sewage in this testing because it is the most aggressive material found in sanitary sewers. This sulfuric acid is produced by the action of certain bacteria on hydrogen sulfide in the absence of air. The details of the phenomena have been reported by the EPA and numerous others.
Refer to Table 2 and Chart 1 for results.
- Material Properties: Tests are made on actual pieces of manholes or samples manufactured consistent in all respects with the construction of the manholes. Tests are to be as follows:
Figure 1: Concentric Manhole Load ASTM Test Model
|
TABLE OF DIMENSIONS
|
| inches |
mm |
| A. 21 min. |
A. 533 min. |
| B. 42 min. |
B. 1067 min. |
| C. 6x6x1/2 |
C. 152x152x12.7 |
|
 |
Table 1: Test Results - Load, Stiffness, and Soundness
|
Test
|
ASTM Requirement
|
48" I.D.Manhole
|
48" I.D.Manhole
|
| Load Rating |
|
|
|
| Maximum Deflection at 24,000 lbs. (inches) |
0.25 |
0.20 |
0.156 |
| Visual Damage at 40,000 lbs lbf. |
none |
none |
none |
| Cylinder Stiffness (psi) |
|
|
|
| 3-6 ft. |
0.72 |
1.38 |
6.25 |
| 7-12 ft. |
1.26 |
1.38 |
6.25 |
| 13-20 ft. |
2.01 |
6.15 |
6.25 |
| 21-25 ft. |
3.02 |
6.15 |
6.25 |
| 26-35 ft. |
5.24 |
6.15 |
6.25 |
| Soundness |
|
|
|
| Leakage at 5psi |
none |
none |
none |
Table 2: Test Results - Chemical Resistance*
| Cone |
pH4 |
pH10 |
Sat'd
NaCl |
20%
H2SO4 |
| Flexural Strength (%) |
80 |
72 |
94 |
80 |
| Flexural Modulus (%) |
96 |
88 |
98 |
92 |
| Barcol Hardness (%) |
80 |
92 |
84 |
90 |
| Cylinder |
|
|
|
|
| Flexural Strength (%) |
85 |
100 |
100 |
80 |
| Flexural Modulus (%) |
80 |
60 |
82 |
82 |
| Barcol Hardness (%) |
80 |
70 |
100 |
82 |
*Extrapolated Values at 100,000 hours
|
Table 3: Test Results - Material Properties
|
48", 42"
Cone |
48", 42"
Cylinder |
| Material Composition (nominal values) |
| Resin (%) |
60 |
42 |
| Glass (%) |
15 |
14 |
| Sand (%) |
25 |
44 |
| Compressive Properties |
| Axial Strength (103 psi) |
* |
18.9 |
| Modulus (106 psi) |
* |
1.4 |
| Flexural Properties |
| Hoop Strength (103 psi) |
15.400 |
22.500 |
| Modulus (106 psi) |
0.820 |
1.050 |
| Axial Strength (103 psi) |
17.200 |
14.300 |
| Modulus (106 psi) |
0.905 |
0.096 |
| Barcol Hardness |
40-50 |
40-50 |
Thickness (in.)
(to accomodate structure loads, Cone thickness ranges from .300 to .550.) |
0.284 |
*Compressive property test methods require flat specimen;
therefore, no cone results are available.
|
Chart 1: Retention Curves - Chemical Resistance*
*Environment: 20% Sulfuric acid
Resin: isophthalic
Laminate construction: manhole cylinder
Copyright © 1999 Containment Solutions, Inc.