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September 1, 2000 Revised: December 27, 2004

Designation: FM 5-565 1. SCOPE 1.1 This test method covers the laboratory determination of the water conductivity of a compacted asphalt paving mixture sample. The measurement provides an indication of water permeability of that sample as compared tothose of other asphalt samples tested in the same manner. The procedure uses either laboratory compacted cylindrical specimens or field core samples obtained from existing pavements. The values stated in metric (SI) units are to be regarded as standard. Values given in parenthesis are for information and reference purposes only. This standard does not purport to address all of the safety problemsassociated with its use. It is the responsibility of the user of this standard to establish appropriate safety, and health practices and determine the applicability of regulatory limitations prior to use.





APPLICABLE DOCUMENTS 2.1 AASHTO Standards: M 231 Weights and Balances Used in the Testing of Highway Materials. 2.2 Florida Test Methods FM 1-T 166 Bulk SpecificGravity of Compacted Bituminous Mixtures.


SUMMARY OF TEST METHOD 3.1 A falling head permeability test apparatus, as shown in Figure 1, is used to determine the rate of flow of water through the specimen. Water in a graduated cylinder is allowed to flow through a saturated asphalt sample and the interval of time taken to reach a known change in head is recorded. The coefficient of permeabilityof the asphalt sample is then determined based on

September 1, 2000 Revised: December 27, 2004

Darcy’s law. 4. SIGNIFICANCE AND USE 4.1 This test method provides a means for determining water conductivity of water-saturated asphalt samples. It applies to one-dimensional, laminar flow of water. It is assumed that Darcy’s law is valid.


APPARATUS 5.1 Permeameter - See Figure 1.requirements: a) The device shall meet the following

A calibrated cylinder of 31.75 ± 0.5 mm (1.25 ± 0.02 in.) inner diameter graduated in millimeters capable of dispensing 500 ml of water. A sealing tube using a flexible latex membrane 0.635 mm (0.025 in.) thick and capable of confining asphalt concrete specimens up to 152.4 mm (6.0 in.) in diameter and 80 mm (3.15 in.) in height. An upper capassembly for supporting the graduated cylinder and expanding an o-ring against the sealing tube. The opening in the upper cap shall have the same diameter as the inner diameter of the calibrated cylinder mentioned previously in Section 5.1a. The underside of the upper cap assembly should be tapered at an angle of 10 ± 1° (see Figure 1). A lower pedestal plate for supporting the asphalt concretespecimen and expanding an o-ring against the sealing tube. The opening in the plate should have a minimum diameter of 18 mm (0.71 in.). The topside of the lower cap should be tapered at an angle of 10 ± 1° (see Figure 1). O-rings of sufficient diameter and thickness for maintaining a seal against the sealing tube. A frame and clamp assembly for supplying a compressive force to the upper cap assembly andlower pedestal necessary to expand the orings. An air pump capable of applying 103.42 kPa (15 psi) pressure and capable of applying vacuum to evacuate the air from the sealing tube /membrane cavity.







September 1, 2000 Revised: December 27, 2004


A pressure gauge with range 0 to 103.42 kPa (0 to 15 psi) with +/- 2% accuracy. Quick connects andpressure line for inflating and evacuating the sealing tube/membrane cavity. An outlet pipe with a minimum inside diameter of 18 mm (0.71 in.) with shutoff valve for draining water. A device manufactured by Karol Warner Soil Testing Systems has been found to meet the above specifications.





Water - A continuous supply of clean, non-aerated water, preferably supplied by...
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