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FAQ - Technical

 

Frequently asked questions about Uretek technology, our solutions for subsidence and settlement problems and about the geopolymer we use.

If you have a question that is not answered here or want more information, please contact us

WHAT ARE THE MECHANICAL PROPERTIES OF OUR MATERIALS?

MECHANICAL PROPERTIES

TYPICAL VALUE

Applied density

50kg/m3 - 500kg/m3

Compressive strength

0.5 MPa - 15 MPa

Shear strength

0.5 MPa - 15 MPa

Tensile strength

0.5 MPa - 3 MPa

Flexural strength

0.5 MPa - 15 MPa

Expansion force

10 000 kPa

E-modulus

10 MPa - 80 MPa

Permeability coefficient

10 - 8 m/s

 

Uretek materials are specified based on the mechanical property requirements of each individual project.

WHICH SOIL TYPES CAN WE WORK IN?

Most soil types are suitable including:

  • Granular soils
  • Cohesive soils
  • Organic soils
  • Made Ground

WHAT IS THE LONGEVITY AND STABILITY OF GEOPOLYMER?

  • Design life in excess of 100 years.
  • Material has been tested and is evaluated to be stable for a minimum of 60 years.
  • Proven practical results with over 30 years of project applications.
  • Material stable between -20 to +100 °C.

IS THERE ANY IMPACT ON THE ENVIRONMENT?

The final geopolymer is inert, the Uretek materials have been developed so that once installed they will leave the site in no worse condition than it was before treatment.

HOW DOES THE MATERIAL WASTE NEED TO BE HANDLED IF IT IS EXCAVATED IN THE FUTURE?

As normal disposal, classified as normal building material waste.

CAN IT BE APPLIED IN SITUATIONS WHERE THERE IS GROUNDWATER?

  • Yes - Uretek materials are hydrophobic.

  • There is no difference between exposing the material to salt water vs. fresh water

HOW DOES THE GROUNDWATER IMPACT OUR MATERIAL?

  • Groundwater has no impact on the mechanical properties of the Uretek material.

DOES WATER PERMEATE THE MATERIAL? DOES THE MATERIAL ABSORB WATER?

The material is a closed cell structure and posses a very low permeability coefficient.

HOW QUICKLY DOES THE MATERIAL CURE AND HOW SOON CAN LOADS BE APPLIED?

  • The material cures within seconds.

  • 90% of the materials’ mechanical properties are reached within the first 15 minutes.

  • The material typically reaches its final properties within 24 hours.

CAN THE MATERIAL BE USED TO ASSIST VIBRATION REDUCTION?

  • This will depend on the material, the circumstances and the density.

  • The material has some elasticity, which is typically positive - for example when comparing to concrete which may break down under shock loadings.

CAN THE SOLUTIONS BE APPLIED IN EXTREME COLD?

The materials and process can be undertaken in any conditions.

IS IT POSSIBLE TO EXCAVATE THE GROUND THAT HAS BEEN INJECTED AND WHAT MACHINERY MAY IT REQUIRE?

Yes it is possible and can be done with normal excavators and hand tools.

CAN YOU TREAT STRUCTURES THAT HAVE BEEN PILED?

Yes, these projects are assessed on a case by case basis by our Engineering department.

HOW DOES THE WEIGHT OF GEOPOLYMER COMPARE TO THE WEIGHT OF SOIL?

  • Typically < 15% of the soil, depending on the geopolymer utilised and the existing soil