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Seminar on dynamic glass technology - introduction and application

The captioned seminar was held on 23 July 2019.

The speaker, Ir Andrew Xie, first explained the history of glass, how glass originally came from obsidian and was initially used for houseware. With industrialisation, different types of glass were developed. Tempered glass was invented in the 1870s and float glass in the 1950s. Float glass consists of a number of constituents, the main being silicon dioxide. The glass can absorb, let through and reflect solar energy.

Sunlight consists of 53% infrared, 44% visible light and 3% ultra-violet light. To reduce solar and visible light transmittance, low emissivity (low-E) coatings are applied to glass and are one of the most effective methods of energy saving. Both pyrolytic and magnetron sputtering vapor deposition processes for solar control low-E coatings or passive low-E coatings would be considered to achieve this.

To better balance daylight shades during different seasons, two types of dynamic glass were developed: thermochromic (TC) and electrochromic (EC). The former is a passive technology using physical coatings, the latter is active, using electrical voltage.

Suntuitive glass is a passive self-tinting TC glass consisting of a Suntuitive interlayer between two glass panes, assembled with one spacer and a low-E coating glass pane. This assembly (insulated glass unit) reacts to the heat changes brought about by sunlight, resulting in a dynamic tinting caused by the Suntuitive layer reacting with sunlight. Greater amounts of sunlight create more heat, and thus a darker tint.

In EC glass, light transmission properties are altered in response to voltage, resulting in solar heat gain efficiencies. There are two main methods: one is a metal oxide sputtered coating, whilst the other is an ion-conductor polymer laminated layer between two glass panels. The amount of tint is determined by a controlled voltage burst.

Dynamic glass is one solution to help us to adapt to the changing environment.

A souvenir is presented to the speaker Ir Andrew Xie (left 2nd)

Technical seminar on the latest technology of anchor test and BIM to underground utilities

The captioned seminar was conducted on 13 August 2019. The first speaker, Mr K M Wong, reminded us that a rebar coupler test should comply with the test requirements of the General Specification for Civil Engineering Works 2006, Volume 2, clause 15.35 for tensile strength and permanent elongation requirements.

He informed us that there are two types of coupler tests: type 1 and type 2, each with different parameters. The performance of type 1 may be used as an alternative to tension or compression laps should permanent elongation after load (0.6 yield) and tensile strength meet specific requirements. Type 2 performance consists also of a static tension test, a static compression test and a cyclic tension-and-compression test. The requirements of the Code of Practice for Structural Use of Concrete 2013 clause 3.2.8 should also apply. Again, the test method was demonstrated through photos and videos.

The second speaker, Mr Zico Kwok, presented the building information modelling (BIM) application for underground utilities: capital work projects of more than HK$30 million shall adopt BIM technology. The Construction Industry Council (CIC) is one of the initiators in promoting BIM application to the underground utilities sector.

It published and released the “CIC Building Information Modelling Standards for Underground Utilities” in July 2019. For underground utilities surveys, it should cover surveying location, conditions and management. There are many types of underground utility networks/systems, which consist of, but are not limited to, gravity flow networks, pressure networks, electricity, telecommunications and others such as foundations and tunnels.

BIM has many standard applications such as Public Available Specification (PAS) 1192, BS1192:2018 Collaboration and Principles, PAS 1192-2:2013 Capital/Delivery Phase, PAS1192-2:2014 O&M Phase, PAS1192-4:2014 COBie, PAS1192-5:2015 Security, New BIM ISO 19650-1:2018 Concepts and Principles and ISO 19650-2 Delivery/Phase of the Assets. Basic principles of ground penetrating radar and case sharing, including 3D scanning applications for several work activities were also demonstrated.

The seminar ended with a question-and-answer session.

Ir C S Lam presenting a souvenir to the speaker Mr Zico Kwok (R)

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