26 June 2019

Case Study-Sika India

Sika® ViscoCrete® Technology

Bangalore Metro Rail Project

Construction of Metro rail viaduct for total 33 km including underground section – divided as different reaches spread in four directions of city with an intersection

The viaduct structure is supported with pier according to the required strength with pile foundation.

Compressive strength required are: Pile 35MPa, Pier 60MPa, Segments 50MPa.

Concrete requirement for precast Segments:

- C 50 MPa,

- High early strength (20 Mpa/24 hrs)

Mix design:

Sika India Pvt. Ltd.

OPC: 460 Kg

20mm: 707.58 Kg

12.5mm: 470.58Kg

R. Sand: 698.82 Kg

Water: 164.02 Kg

Sika ViscoCrete 10 Top BM: 2.025 Kg

W/C ratio: 0.32

Slump retention: 120 cm for 3 hours

Sika viscocrete 10 Top BM, the indigenously developed super plasticiser for this project has water reduction of around 28 per cent, high slump life, and great early strength development. This product is being used primarily for precast segments and Piers by the various contractors working in these project. Based on a new polymer introduced by Sika AG during 2010, this product matches the requirement of precast concrete in hot weather condition

 

Prime Test Data

Working at M50, M60

Workability: 120mm/120 minutes at 0.5 per cent BWOC

Air content: < 1.5%

Final setting: 12 hrs

1D CS: 20-25 MPA

28 Day CS: 65-75 MPA

 

Underground Rail Tunnel

Delhi Metro Rail Project

  • The tunnel length was of 8 KM, a part of Delhi Metro Project, under package BC-16.
  • The construction period was 24 months and the over all cost of the construction was $175 Million
  • 4 TBM`s were being used for Tunnel boring.
  • There are 4 Metro Stations.
  • Concrete Quantity was 0,175 Million Cubic meter.
  • Sika had supplied around 60 per cent of Chemicals & waterproofing systems.
  • Products mainly used, - Sikament 170 UV, Viscocrete 20HE, Sigunit L, Plastiment VZ, Sikaplan WP 20HL,Sikarep microcrete-4.

 

Backfill Grout Mix

  • Cement 240 KG
  • Bentonite 35 KG
  • Water 828 KG
  • Stabilizer 2 Liter
  • (Plastiment VZ)
  • Accelerator 80 Liter
  • (Sigunit L)
  • Technical Data
  • Target Gel Time 8-15 sec.
  • Target Set Time 30 Min.
  • Target Strength 1Hr. -0.05 MPa
  • Target Strength 24Hr. -0.4 MPa

 

Precast Mix (M50)

  • Cement 394 KG
  • Micro Silica 0.5 KG
  • Fly Ash 70 KG
  • CA 20mm 682 KG
  • CA 10mm 455 KG
  • Sand 680 KG
  • Water 144 KG
  • Viscocrete 20HE 1.5 KG

 

Technical Data

  • Workability 25mm (Slump )
  • Strength 12hr. 16 MPA
  • Steam Cured 8 Hr. 17 MPA
  • Metro Station Water Proofing
  • Material Quantity
  • Total Area for Waterproofing – 90000 Sq M
  • Fully Automatic Leister M/C used for membrane welding.
  • Geotextile (Sarnafelt 300) -90000 Sqm. Used as a cushion to Membrane.
  • Other Items used Termination bars, U-bar, Roundels, Sarnacol 808 (Adhesive)



Leave a Comment

Name  
Email Address
(will not be published)    
Website
Comment