What is Rice Value asphalt?

This value is based on the asphalt mixture’s maximum specific gravity also known as the Rice value or G mm in Superpave. The maximum unit weight is determined by multiplying the Rice value by 62.4 pounds per cubic foot (PCF). For example, 2.500 is a typical Rice value. 2.500 X 62.4 = 156.0 PCF.

What is Rice density?

Density was nearly constant at 1.452 g/ml in all rice varieties; in paddy, the value was around 1.182 g/ml for round varieties and around 1.224 g/ml for others. Bulk density varied appreciably in both rice (0.777-0.847) and paddy (0.563-0.642 g/ml), and so did porosity (41-46% in rice, 46-54% in paddy).

How do you calculate specific gravity of asphalt?

Theoretical maximum specific gravity is determined by taking a sample of loose HMA (i.e., not compacted), weighing it and then determining its volume by calculating the volume of water it displaces (Figure 1). Theoretical maximum specific gravity is then the sample weight divided by its volume.

How do you calculate GMM?

Gmm = maximum specific gravity of paving mixture (no air voids) Pmm = total loose mixture = 100% Ps = aggregate, percent by total weight of mixture (P1 + P2 + P3 + Pn) Pb = asphalt, percent by total weight of mixture.

How is optimum asphalt content calculated?

Marshall method is used to calculate optimum asphalt contents by using 5 percentages of asphalt (3.5,4.0,4.5,5.0,5.5) and find stability ,flow,density and air voids for each specimen. The optimum asphalt content to many engineers is the an asphalt content corresponding to an air voids ratio of 4%.

What is GMM in bitumen?

The theoretical maximum specific gravity (Gmm) of a HMA mixture is the specific gravity excluding air voids. Thus, theoretically, if all the air voids were eliminated from an HMA sample, the combined specific gravity of the remaining aggregate and asphalt binder would be the theoretical maximum specific gravity.

How do you calculate bitumen content in asphalt?

– Find out the dimension (Width and thickness)
– Calculate Volume of Asphalt = (Long * Width * Thickness) m^3.
– Find out the density of Asphalt (2330 or 2450 Kg/m^3)
– Calculate the quantity of Asphalt= ( Density* Volume) Kg/MTon.

How is asphalt compaction measured?

It can be measured using pavement cores or portable nuclear or electric gauges; measurement specifications vary from one contracting agency to the next. Percent air voids is usually reported as a density in one of three forms: (1) percent TMD, (2) percent of laboratory density or (3) percent of control strip density.

Can asphalt be compacted?

For asphalt mixtures, compaction locks the asphalt-coated aggregate particles together to achieve stability and provide resistance to deformation (or rutting) while simultaneously reducing the permeability of the mixture and improving its durability.

How do you do compaction on asphalt?

The most-common approach to compaction, but not the best, is a rolling train, which involves a series of rollers operating one after the other close behind the paver. The train starts with a double drum vibratory roller operating close behind the paver to obtain the initial compactive effort while the mix is still hot.9 May 2016

What is the density of compacted asphalt?

The normal target in-place density on a “dense” hot-mix asphalt pavement is 92 to 93 percent of Gmm (or 7 to 8 percent air voids). If a pavement has low density (usually defined as less than 92 percent of Gmm), the air voids are interconnected and premature pavement distresses can result.

What is the density of one grain of rice?

The sphericity analysis values varied from 0.480 to 0.559, aspect ratio from 0.39 to 0.55, volume of the grain was measured in range from 16.25 to 22.02 mm3, bulk density values were 0.77–0.87 g/cm3, and solid density from 1.17 to 1.41 g/cm3.13 Aug 2018

Why do we do the rice density test?

The Rice Test for Specific Gravity of Asphalt is a common test that measures the Theoretical Maximum Specific Gravity (Gmm) of asphalt specimens. The test is an integral part of the quality assurance of asphalt mixtures. Free and entrapped air is removed from the asphalt sample to prepare for the test.