Hydrophobe VII., Lisbon

Transcription

1 Hydrophobe VII., Lisbon The water repellent treatment of building materials in thermal baths Debrecen, Hungary

2 The geothermal potential in EU János Major University of Debrecen, Faculty of

3 Thermal baths in Budapest The construction of the thermal baths in Budapest has been a real challenge for master builder. The restoration of the bath construction has been equally complicated.

4 The major reasons In the vicinity of the construction there are several natural and drilled fountains Floods of the Danube river endanger permanently the environment The ground water level changes permanently because of the vicinity of the Danube river Debrecen, Hungary

5 Building use and its problem The spa building structure must be protected against: High water temperature Very aggressive water Cleaning materials

6 The action of the mentioned effects

7 Steel pipe after 15 years

8 Iron fitting used for thermal water transport

9 The wall after thermal water attack

10 Effect of the cleaning materials on stone elements and pointing material

11 Corrosion of the steel reinforcement

12 Corrosion of the steel reinforcement in concrete

13 Corrosion of the reinforcement

14 Thermal water reservoir

15 Thermal water reservoir with severe incrustations

16 Thermal water reservoir

17 Protective measures: Materials A newly developed cement admixture for an integral water repellent impregnation (StrongGuard) Cement with very low shrinkage (C-Mix cement)

18 The cement admixture properties 90% calcium oxide is present in admixture Density kg/m3 Average diameter of the grains of StrongGuard admixture is about 4-5 µm Contact angle can be close to 140 C

19 Technical parameter The low shrinkage cement Time (day) Dimension EN Testing results Beginning of hardening time minutes min ± 20 Compressive strength 2 N/mm 2 min ± N/mm 2 min.32.5 max ± N/mm ±3. 0 Tensile strength 2 N/mm 2-3.5± N/mm 2-4.4± N/mm 2-9.0±0.3 János Major University of Debrecen, Faculty of Engineering, Debrecen, Hungary Expansion mm max

20 StrongGuard admixture

21 Experimental tests

22 The application of hydrophobic additive in enviromental protection

23 Burning experiment Debrecen, Hungary

24 Very wide range of SG admixture use Watertight, salt resistant concrete additive mixture Watertight, salt resistent mortar additive mixture Wall-drier plaster additive mixture Gypsum hydrophobic additive mixture Debrecen, Hungary

25 Other uses Enviromental additive mixture for remediation of petroleum and its derivatives Higher hydrophobicity of earth and loamwalls Much more hydrophobic passive house elements

26 Conclusions The above listed damages can be eliminated with help of two new materials: steel corrosion water repellent concrete stops the water penetration into concrete structure, the embedding mortar and pointer durability depends on water or cleaning material intrusion depth and very low material volume-deformations, wall and mortar durability is longer if the water can t act in structure just on surface. The SG admixture is environmental friendly, and it is highquality adsorbent of oil products being on water and solid surfaces.

27 Thank You!!!