Table of Contents
What is the difference between bulk and apparent specific gravity?
The bulk or volume specific gravity is based upon the volume as a whole–i.e., the solid material with all included pores. The apparent specific gravity is based upon the volume of the solid material plus the volume of the sealed pores.
What is bulk specific gravity SSD?
Bulk Specific Gravity (SSD) (Gsb SSD) – the ratio of the mass, in air, of a volume of aggregate, including the mass of water within the voids filled to the extent achieved by submerging in water for 15 to 19 hours (but not including the voids between particles), to the mass of an equal volume of gas-free distilled …
Why is bulk specific gravity important?
Bulk specific gravity of aggregate is important information for designing hot mix asphalt because it is used to calculate voids in mineral aggregate and voids filled with asphalt. Periodically, the aggregate is lightly tamped into a cone-shaped mold with 25 light drops of the tamper.
What is bulk specific gravity of sand?
Soils with large amounts of organic matter or porous particles have specific gravities below 2.60….Standard Value of Specific Gravity of Sand.
| Types of Sand | Specific Gravity value |
|---|---|
| Normal Sand | 2.65-2.67 |
| Silty Sand | 2.67-2.70 |
| Inorganic Clay | 2.70-2.80 |
What is the bulk specific gravity of fine and coarse aggregates?
between about 2.400 and 3.000
Typically, aggregate used in HMA production will have a bulk specific gravity between about 2.400 and 3.000 with 2.700 being fairly typical of limestone.
What is the bulk specific gravity of fine aggregates?
The specific gravity of fine aggregate (sand) is considered to be around 2.65 to 2.67. Sand particles composed of quartz have a specific gravity between 2.65 to 2.67. While inorganic clays generally range from 2.70 to 2.80.
Is bulk specific gravity Unitless?
Specific gravity is the ratio of a material’s density with that of water at 4 °C (where it is most dense and is taken to have the value 999.974 kg m-3). It is therefore a relative quantity with no units.
What is GMB asphalt?
BULK SPECIFIC GRAVITY (Gmb) OF COMPACTED HOT MIX ASPHALT (HMA)
How do you calculate GMB in asphalt?
Gmb = bulk specific gravity of compacted mixture. (KT-15) Ps = aggregate, percent by total dry weight of mixture. Calculation using data from Table 1 and section 3.2. VMA = 100 – (2.344 x 93.04) 2.652 = 100 – 82.23 = 17.77 Calculation using data from Table 1 and section 3.2.
How do you calculate bulk specific gravity?
The bulk specific gravity of a compacted asphalt mix specimen is determined by computing the ratio of its mass in air to its bulk volume.
What is bulking of fine aggregate?
Bulking of fine aggregate or sand is the phenomenon of increase in sand volume due to the increase of moisture content.. Bulking test on fine aggregates has to be performed before using it in construction.
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