Greater Bay Area Technical Visit –Dextra Guangzhou
Factory-Manufacturing of GFRP
Organizer: HKIE Materials Division,
Co-organizer: The Institute of Materials, Minerals and
Mining Hong Kong Branch
Date, Time &
Venue:
6 July
2019 (Saturday)
8:30 -5:00 pm and return to Futian checkpoint,
Assembly: 8:30 am at Lok Ma Chau MTR Station (Hong
Kong side) –In front of Watsons (Floor L1).
Programme Highlights
In reinforced concrete
structures and geotechnical applications, FRP materials have become a
substitute for steel. It can be either made Glass-fibre based (GFRP0 or Carbon
–fibre based (CFRP). It has advantages over steel in offering very high
–tensile performances with light weight compared to steel, fully resistant to
corrosion and cut-able by standard earth removal equipment and Tunnel Boring
Machines (TBMs). Since 1996, Dextra has established new standards, becoming the
worldwide reference in FRP manufacturing, In this visit, participants will have
the opportunity to see the “Pultrusion” manufacturing process of 25mm GFRP
permanent rock-bolted (fully threaded) for Caverns and 13mm GFRP permanent
rebars (straight and bends) for concrete reinforcement.
Registration & Enquiries
The
number of participants is limited to 30. Cost
HK$ 150 for transportation only. Lunch excluded or to be equal shared. For
registration, please fill in the HKIE application standard form and email to lamchising@hotmail.com. Only the
successful application will be notified for the payment method on or before 25
June 2019. For enquiries, please contact Ir CS Lam at 91527659. CPD certificate
will be issued after attending the factory visit.
Note:
1) The
successful applicant need not to equip with his/her own safety helmet, but
equipped with his/her safety shoes and safety vest for the visit. The host
organizer will arrange safety helmet for the visit if necessary.
2) The
host organizer has right to change the itinerary without prior notice. For
personal interest, the participants should purchase his own insurance.
3)
The
seminar will be cancelled if No. 8 or higher Tropical Cyclone Warning Signal or
Black Rainstorm Warning is issued / still in effect within two hours before the
starting time.
4) A valid passport /Chines
Travel Card is required for the visit. Applicants should make their own
arrangement for the Visas when planning to visit Mainland China.
ReportGreater Bay Area Technical
Visit –Dextra Guangzhou Factory-Manufacturing of GFRP
By Ir LAM Chi Sing
A technical visit was
organized on 6 July 2019 by the Materials Division of the HKIE and the
Institute of Materials, Minerals and Mining IOM3 (Hong Kong Branch). Upon arrival,
the representative of Dextra Group Company welcame receiving our Members
and gave us a presentation in the lecture room. The representative Mr.Pierre
HOFMANN introduced Glass fibre reinforced polymer (GFRP) material
which is commonly used as a temporary reinforcement in the construction fields,
especially for tunnelconstruction. Dextra has developed an innovative product to revolution
approach to use composite (fibre glass polymer) materials in tunnels and
caverns work, with a permanent solution suitable for projects of 50, 100 or
even 120 years lifetime.
Fibre
is a material which can be glass, aramid and carbon. Polymer is a thermoset of
polyester, vinylester and epoxy, which combines can form fibre reinforcement.
It is a light weight material with easy handling. According to the ENISO14040,
it can achieve 100% life cycle assessment. In the American Concrete Institute,
AC440.IR015, Guide for the Design and Construction of Structural Concrete
Reinforced with fibre-reinforcement polymer (FRP) Bars was also used as one of
the design criteria. Its tensile stress is doubled compared to steel rebar
grade 500, for only 25% of its weight. Cut –ability test can be applied to
Glass fibre reinforced polymer (GFRP) which has high rock bolt shear capacity.
Dextra introduced GFRP soft-eye. The soft-eye technology has been developed in
1996 ad successful implemented for the Bangkok MTR subway station. The single
shear guillotine test of bolt/grout system shall comply with BS7861-1:2017,
strata reinforcement support system components used in coal mines-Part 1:
specification for rock-bolt, and can develop 350 MPa Several case studies for
the application of rock bolts were also discussed. To test its durability, GFRP
bar were subjected to high ph value (12.6 ≤ ph≤13.0) with 60 degrees
Celsius with duration greater than 6 months.
After the talk, the participants were led to visit their laboratory
and factory to understand the workflow of glass fibre reinforced polymer
reinforcement bar. The technical visit ended with the question-and-answer
session.
Group Photo