Ecobuild 2017 7. March, London

Light-weight composite sandwich panel façades enabling complex geometries Isabelle Paparo University of Cambridge Presented by Dr Marco Dona

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Introduction

Vanke Pavilllon, Italy

Prada Store, Tokyo King Abdulaziz Centre for Knowledge and Culture, Saudi Arabia

Walt Disney Concert Hall, Los Angeles

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Yitzak Rabin Center - Tel Aviv, 2002-2005

Stedelijk museum - Amsterdam, 2007-2012

Enexis office - Maastricht, 2013

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Introduction

Vanke Pavilllon, Italy

Prada Store, Tokyo King Abdulaziz Centre for Knowledge and Culture, Saudi Arabia

Walt Disney Concert Hall, Los Angeles Environmental Performance of GFRP Sandwich panels

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Moisture. o  Diffusion process o  Hydrolysis & Plastication o  Interface cracking & Debonding

Environmental deterioration

Temperature. o  Accelerated photochemical reactions

UV Radiation. o  Photooxidation o  Chain scissoring o  Colour changes, Gloss loss, Chalking & Blooming

H2O

H2O

H2O

Moisture. o  Diffusion process o  Hydrolysis & Plastication o  Interface cracking & Debonding

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Artificial ageing 1.  Constant loading – 15% to 35% of maximum failure

load 2.  Freeze-Thaw cycles - 24 ±1 °C to -14 ±1 °C * (100 & 200 cycles ~ 1.5 months and 3 months)

Material ◦  [0/-45/90/+45] multiaxial stitched Glass mat (Formax) ◦  Epoxy (Gurit®– Ampreg 21FR) ◦  Thermoplastic PET structural foam (Gurit® – G-PETTM FR)

Experimental program

Destructive testing 1.  Ramp loading tests in 4-PB set-up 2.  Cyclic fatigue test (with subsequent test in destruction 4-PB set-up) 3.  Double cantilever beam test - DCB (Delamination energy G)

*ASTM D7792 – “Standard Practice for Freeze/Thaw Conditioning of Pultruded Fiber Reinforced Polymer (FRP) Composites Used in Structural Designs”

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Environmental Ageing. Testing set-up and control system

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Test results NA - Series

0% - Series

◦  Freeze –Thaw cycling show a trend of increasing the panel stiffness ◦  On the contrary, constant loading follow a decreasing trend

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Progress & Future work.

Introduction Defining the feasibility of the application of FRP as an innovative material in façade engineering

Future work o  Understanding and evaluating the vast

quantity of data obtained during ageing

o  Destructive mechanical testing: Fatigue+3PB/DCB

o  Focus on Core properties by evaluating and ageing core separately

Further Ideas & suggestions? Please contact me: idjp2@cam.ac.uk

Theoretical Background o  Determination of environmental

influences & consequences of weathering

o  Material selection for the application in façade systems

o  Design process for sandwich panels (in façade systems)

Experimental program o  Determination of testing

parameters

o  Planning and building the testing set-up

o  Programming the test control system (long-term testing)

o  Setting up of controls to gain the required data

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Thank you for your attention!