1. Strain Hardening Concrete – Applications in Underground Coal Mines

2. Who is Illinois Tool Works (ITW)? - ITW is a global, diversified manufacturer of engineered products - Established 1912 - Financial performance Y11: revenue $17.8bn - Third largest patent holder in the US - 750 business units worldwide - ITW Construction Systems established 1921 - 3 manufacturing facilities in Australia

3. What is Strain-Hardening Concrete?  Strain hardening effect  High ductility  Micro cracking

4. Micro cracking  Micro cracking  Improved corrosion protection  No delamination What is Strain-Hardening Concrete?

5.  Portland Cement  Fly Ash  Water (w/c-ratio~0.35)  Sand (≤ 400 Micron)  Polyvinylalcohol (PVA) Fibres (2%)  Admixtures What is Strain-Hardening Concrete?

6.  Compressive Strength: 50 MPa  Flexural Stress (ultimate): 8 MPa  Tensile strength (ultimate): 5 MPa  Young’s Modulus: 17 GPa  Tensile Strain Capacity: > 1.5%  Crack width at Ultimate: < 0.3mm  Density: 200 kg/m 3 Flexus TM – Engineering Properties

7. Strain ε [%] Flexus TM – Typical Stress Strain Curves Strain ε [%] Tensile Stress [Mpa] Flexural Stress [Mpa]

8. Flexus TM – Applications in Underground Coal Mining  Ventilation Control Devices  Repair of Ventilation Control Devices  Rib Support

9. Flexus TM – Ventilation Control Devices  No rebate required  Material reduction of up to 25%  Significantly less rebound  Less transport and maintenance  Faster installation

10. Flexus TM – Repair of VCDs  High bond strength – no preparation required  Strain-hardening behaviour limits delamination  Micro-cracking keeps VCDs air tight even if seal deflects due to roof-to-floor conversion due to roof-to-floor conversion  Significantly less rebound  Less labour, transport and maintenance

11.  Flexus can be sprayed onto unprepared coal  Fast application speed (>50m 2 per hour)  Up to 3 times faster than conventional rib support  Up to 10 times faster in hard-to-get areas BeforeAfter Flexus TM – Rib Support

12. Flexus TM – Summary  Cost-efficient solutions due to less material required  Trained contractors available  Technical assistance  Product design can be tailored to specific requirements  Onsite support by trained representatives

13. ITW Construction Systems Claus Rotstein, Business Development Manager 0437 246 171 crotstein@flexus.com.au