# What is the rice test for asphalt?

## What is the rice test for asphalt?

Specific Gravity

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.

### What is difference between GMM and GMB?

The difference between Gmm and Gmb is volume. The weights are identical. The difference in volume is the volume of air in the compacted HMA mixture.

#### How do you calculate GMB?

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 GMM in asphalt?**

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.

**What is the compaction rate of asphalt?**

Remember, the compaction rate, as a general rule, is about 6 mm (1/4″) per 25 mm (1″) of screed laid thickness when a vibratory screed is used and about 5 mm (1/5″) per 25 mm (1″) when a tamping and vibrating screed is used.

## What is a rice value?

These values can be recalled simply by our name — RICE — Responsibility, Integrity, Community and Excellence.

### What is GMB asphalt?

This procedure covers the determination of bulk specific gravity (Gmb) of compacted hot mix asphalt (HMA) using three methods – A, B, and C – in accordance with AASHTO T 166-12. This FOP is for use on specimens not having open or interconnecting voids or absorbing more than 2.0 percent water by volume, or both.

#### What is GMB test?

Overview. The bulk specific gravity test is used to determine the specific gravity of a compacted HMA sample by determining the ratio of its weight to the weight of an equal volume of water.

**How do you calculate specific gravity of bitumen?**

The principle is that it is the ratio of mass of a given volume of bitumen to the mass of an equal volume of water, both taken at a recorded/specified temperature. Take the sample (half the volume of the specific gravity bottles). i) Clean, dry and weigh the specific gravity bottle along with the stopper (Weight ‘A’).

**What does GMB stand for in asphalt?**

BULK SPECIFIC GRAVITY (Gmb) OF COMPACTED HOT MIX ASPHALT (HMA)

## How is optimum bitumen content calculated?

Determine the optimum binder content for the mix design by taking average value of the following three bitumen contents found form the graphs obtained in the previous step….Determine optimum bitumen content.

Test Property | Specified Value |
---|---|

Percent air voids in the mix % | 3 – 5 |

Voids filled with bitumen % | 75 – 85 |

### How is optimum binder content calculated?

The optimum asphalt content is determined by judging the appearance of the asphalt through the pyrex dishes. The optimum binder content should be determined by observing the excessive mixture draindown, or filling of un-compacted air voids through the pyrex dish.