05.
Introduction For fine aggregate— H-3383F For coarse aggregate— H-3383L The Phunque Flask is the key element in a newly developed method for conducting specific gravity/absorption determinations for aggregate. This method has been designed to eliminate the inherent guess work built into ASTM C128 and AASHTO T-84— the current cone and tamper methods in use today.
Although you may have no need for it, personnel can be familiar with the term "apparent specific gravity," which pertains to the relative density of the solid material making up the constituent particles (not including the pore space within the particles that is accessible to water).
The Procedure Step 1 When using normal weight aggregate, weigh out 1200 +/- 10 grams of oven-dry sand or 5000 +/- 50 grams of coarse aggregate to be tested. Make sure that the sample accurately represents the material to be evaluated. If testing lightweight aggregate, reduce the amount of material weighed out to 600 +/- 10 grams. Step 2 Fill the flask approximately 1/2 full, by height, with distilled water. Step 3 Measure out, but do not add yet, approximately 250 g (8.82 ounces) of distilled water.
Step 10 Aggressively shake, roll and agitate the flask for a period of three minutes so that all of the air is allowed to escape. (A plug must be placed into the neck of the coarse aggregate flask to prevent loss of water during the shaking and agitation to prevent water loss during this step.) Step 11 Allow the flask to remain undisturbed for two minutes. Step 12 Obtain and record the reading at 5 minutes.
Calculating saturated bulk specific gravity (BSGssd): BSGssd = (Wd + Wabs)/[Vi – Vw] Where: Wabs = Water absorbed into the sample, (Vi – Vf), ml Wf = Weight of the flask, g Vw = Volume of water [WT – (Wd + Wf)], ml WT = Total weight of the flask, water and sample, g Calculating dry bulk specific gravity (BSGd) BSGd = Wd/(Vi – Vw) Calculating conventional absorption Use the Correlation Equation shown below to calculate the Conventional Absorption as follows: Conventional absorption, percent = [(Absorption x
Calculating apparent dry specific gravity (ASGd) Wd/[(Wd + Wf + Vf) – (WT – Rfinal)] Where: Vf = calibrated volume of flask, ml Rfinal = Final direct reading, ml
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