Trouble Shooting Guide Slurry and Microsurfacing Emulsions.

Problem

Potential Solution

1. Slurry sets too fast

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Slurry sets too slowly

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Slurry Dries brown;

 

 

 

 

 

 

 

When broken in half the stone is not coated in the slurry.

 

 

 

SEE QA and QC guides.

 

 

Emulsion:

Increase Roadchem 300 by 0.1% intervals.

Increase pH in 0.2 intervals to 2.5maximum

Add a small amount of Roadchem 500

Make sure slurry emulsion is < 25C at application.

Check all manufacturing parameters and  emulsion properties to ensure that they are in specification.

 

On the Road:

 

Check that road temperature is 45C or less.

Increase additive level by 0.25% intervals

Check that water is clean

Check that water spay is working on pavement.

Change emulsion type.

Add 0.5% of Roadchem 500 to the water.

Check cement flow.

Check Macropaver calibration

Check aggregate grading

Check aggregate SE.

Check emulsion temperature.

 

Emulsion:

 Decrease emulsifier level by 0.1% intervals

Decrease pH by 0.2 intervals to 1.8 minimum

 

 

Add a small amount of Roadchem 201

Make sure slurry emulsion is >30C at application.

Check all manufacturing parameters and  emulsion properties to ensure that they are in specification.

 

On the Road:

 

Check that road temperature is 15C or higher.

Decrease additive level by 0.25% intervals

Use a 50/50 blend of Alum and Roadchem JP4

Check that water is clean

Change emulsion type

Check cement flow. Increase by 0.5%

Check Macropaver calibration

Check aggregate grading

Check aggregate SE.

Check emulsion temperature.

Spread fine silica sand by blowing onto the slurry surface to allow traffic faster. ( 0.5-2kg/m2)

 

This is due to excess water being trapped and is probably a false slurry.

 

In such a case treat as if the slurry is setting too QUICKLY even though it will appear that it is too slow.

 

 

Treat as if the slurry is setting too quickly.

Add 0.5% Roadchem 500 to the asphalt before milling.

Check pugmill coating.

Check paddles.

Check aggregate grading and SE.

Check water quality