118
(From page 116)
The behaviour of a concrete ele- ment when exposed to fire depends, inter alia, on the properties of the aggregate and, because of this, ag- gregates are grouped into two classes, those of class 1 being the less affected by heat. Well-burnt clinker, foamed slag, expanded clay, shale of slate and pumice, which are exposed to heat in the course of their formation, are all included in class 1; sintered pulverized fuel ash could now be added to this list, for the Most natural aggre- gates, other than limestone, fall into class 2.
same reason.
Table 2 shows the fire resistance of concrete walling in blocks made with class 1 aggregates. in terms of the minimum thickness required to give different periods of fire resis-
tance.
Foamed slag blocks reinforced in every horizontal joint are sometimes used for the protection of steel stanchions; 3 in. blocks unplastered. give four hours fire resistance, and 2 in, blocks two hours.
a
Vermiculite/cement slabs. in 4:1 mix, wire-mesh reinforced and finished with a skim coat of gypsum
plaster can be used similarly, a 2
21 in. slab giving four hours and a 1 in. slab two hours fire resistance.
Reference is made in B.S. Code of Practice C.P. 115 to the use of vermiculite concrete to increase the fire resistance of prestressed concrete members; vermiculite concrete slabs 1 in. thick placed as a lining to the mould, give an increase of ap proximately two hours.
Prepared at the Building Research Station. Garston, Herts.
August 1962. Crown Copyright.
INGLIS LEAVES NEXT MONTПI
MR. ALLAN INGLIS. C.M.G.,
Director of Public Works, is due to leave the Colony on retire. ment leave next month.
The Secretary of State for the Colonies has selected Mr. Alec Michael Wright, Deputy Director
of Public Works, to succeed Mr. Inglis whon has held the post since
1957.
Mr. Wright, born in Hnog Kong in 1912, was first appointed archi tect in the Public Works Depart- ment on December 2, 1938. He was promoted to chief architect in December, 1950 and held the post until October 1956, when he was appointed assistant director. He
U.K.
became deputy director three years later.
Mr. Wright and his family have been associated with Hong Kong for many years. His grandfather came to Hong Kong in 1889, and his father spent over 25 years in the Public Works Department before retiring in 1929.
KAI TAK AIRPORT
TERMINAL BUILDING
885 FRANKI PILES
TERMINAL BUILDING,
SOUTH-EAST
EXTENSION
86 FRANKI PILES.
LTK
Sole Licencees:
Architects:- Ramsey, Murray, White
and Ward (London) in association with W.W.C. Shewan of Eric Cumine.
FRANKI PILING AND ENGINEERING (HONG KONG) LIMITED.
No. 81F. WATERLOO ROAD.
KOWLOON.
TELEPHONE: 821931
ST. GEORGE'S BUILDING. 2ND FLOOR. HONG KONG. TELEPHONE: 38056
THE HONG KONG & FAR EAST BUILDER -
VOLUME 17, NUMBER 5
Page 120Page 121