What is the Marshall test?

The Marshall Test is a popular and proven method to measure the load and flow rate of asphalt specimens, beginning with compaction into molds using manual or automated Marshall Compactors, and conditioned in a Water Bath at the specified temperature.

How did Marshall test it?

In 1984 Marshall did the ultimate test by infecting himself with the bacteria, developing the symptoms of the disease and then successfully treating himself with antibiotics. Marshall and Warren spent many years trying to convince the medical establishment of the validity of their work.

What is Marshall method of mix design?

The Marshall method, like other mix design methods, uses several trial aggregate-asphalt binder blends (typically 5 blends with 3 samples each for a total of 15 specimens), each with a different asphalt binder content.

What is Marshalls filler test?

Filler produces mix of higher stiffness and improves performance against rutting distress. However, different fillers behave differently and produce different property asphalt concrete.

How is Marshall stability test conducted?

The material is compacted with 50 blows of the hammer (or as specified), and the sample is inverted and compacted in the the other face with same number of blows. After compaction, the mold is inverted. With collar on the bottom, the base is removed and the sample is extracted by pushing it out the extractor.

Marshal Stability Test Tutorial

Why Marshall test is done?

Using the Marshall Stability Test, engineers can predict how well an asphalt mixture will perform and the maximum load it can support.

What is martial stability test?

Marshal stability test is the performance prediction measure conducted on the bituminous nix. The procedure consists of determination of properties of mix, Marshal stability and flow analysis and finally determination of optimum bitumen content. The concept of phase diagram is used for the calculations.

What are two major features of the Marshall method of mix design?

The two principle features of the Marshall method of mix design are a density-voids analysis and a stability-flow test of the compacted test specimens. The stability of the test specimen is the maximum load resistance in Newtons that the standard test specimen will develop at 60°C when tested as outlined.

Which are the two major parameters considered in the Marshall mix design?

9. Which are the two major parameters considered in the Marshall mix design? Explanation: Density and stability are the two important features that are used in the Marshall mix design procedure.

What is flow value of bitumen?

The flow values for the asphalt concrete with mineral filler range from 2.3 mm – 3.3 mm, while that with hydrated lime range from 2.4 – 3.4 mm. The optimum bitumen content for both mixtures was found to be 6.5%.

How do you cure Helicobacter pylori?

pylori-caused ulcers are treated with a combination of antibiotics and an acid-reducing proton pump inhibitor. Antibiotics: Usually two antibiotics are prescribed. Among the common choices are amoxicillin, clarithromycin (Biaxin®), metronidazole (Flagyl®) and tetracycline.

What is Marshall flow?

The flow value is the total deformation of Marshall Test specimen at the maximum load, expressed in mm units. In the Marshall method of mix design, each compacted test specimen is subjected to the following tests and analysis.

Why is the Marshall stability test for asphalt important?

The Marshall Test measures the load and flow rate of asphalt samples. Because not all asphalt is created the same, engineers need to predict how well an asphalt mixture will perform in addition to the maximum load it can support.

Which bitumen does not need heating?

10. Which bitumen does not need heating? Explanation: The cutback bitumen which is the most economical type may or may not require heating, whereas the remaining required to be heated.

What is the temperature range to which bitumen is heated in the Marshall mix design?

The bitumen is heated to temperature of 121 ° to 138° C and the required quantity of first trail percentage of bitumen is added to the heated aggregate and thoroughly mixed using a mechanical mixer or by hand mixing with trowel.

What is Marshall design?

The Marshall Mix Design method was originally developed by Bruce Marshall of the Mississippi Highway Department in 1939. The main idea of the Marshall Mix Design method involves the selection of the asphalt binder content with a suitable density which satisfies minimum stability and range of flow values.

What is specific gravity of bitumen?

The specific gravity of pure bitumen is in the range of 0.97 to 1.02.

What is ductility test of bitumen?

property of bitumen which allows it to undergo deformation or elongation is called ductility of bitumen. The ductility of bitumen is measured by the distance in Cm (centimeter), to which the bitumen sample will elongate before breaking when it is pulled by standard specimen at specified speed and temperature.

What are the symptoms of Helicobacter?

Should my spouse be treated for H. pylori too?

Since spouses had the highest H pylori positivity rates, our findings suggest that at least the spouse of an H pylori-positive patient should be screened and treated if positive.

Can stomach bacteria be cured?

pylori treatment usually includes several medicines. At least two of the medicines are antibiotics that help to kill the bacteria. The other medication causes the stomach to make less acid; lower acid levels help the ulcer to heal. Most people are cured after finishing two weeks of medicine.

What foods should I avoid if I have Helicobacter pylori?

Food that stimulates the secretion of gastric acid (such as coffee, black tea and soft drinks) and food that irritates the stomach lining (like pepper, and processed, fatty meats, such as bacon and sausage) should be avoided when treating an H. Pylori infection.

What does H. pylori look like in stool?

pylori gastritis, call a doctor immediately if the following occur as they may be symptoms of gastrointestinal bleeding or ulcer perforation: Sudden, sharp abdominal pain. Blood in the stool or black feces. Bloody vomit or vomit that looks like coffee grounds.

How did I get H. pylori?

You can get H. pylori from food, water, or utensils. It's more common in countries or communities that lack clean water or good sewage systems. You can also pick up the bacteria through contact with the saliva or other body fluids of infected people.