224. A total number of 582 tests were made on the physical properties of cement and several brands new to the Colony were tested.
225. 343 tests were carried out on the physical properties, shearing strength, "Californian Bearing Ratio" values and salinity of various types of soils.
226. In the case of aggregate testing, a total of 1,048 tests were carried out during the year which included sieve analysis and tests on crushing strength, bulk density and organic impurities.
227. 812 tests were made for the Hot Extraction of bitumen macadam and also 13 tests were carried out for other properties of bituminous materials.
228. Since the installation of the new Avery 50-ton universal testing machine in August, a total number of 166 tests had been carried out on mild steel rods for their tensile strength, percentage elongation under load and quality when bent cold.
229. Other materials tested were hydrated lime, hollow tiles, wood wool slabs, fuel oil, rubber blocks and powder, and extracted quarry dust.
230. The following investigations were in hand:-
(a) The effect of powdered rubber on bitumen 80/100 and M.C. 4.
(b) The stabilization of Hong Kong laterite soil by hydrated lime.
(c) The apparent changes of volume of sand under submerged and drained condition.
(d) The determination of the permeability and "C.B.R." values of Hong Kong laterite soil and its application to pavement design.
ROADS OFFICE
Chief Engineer (Acting), F. A. Fisher, B.Sc., LL.B., A.M.I.C.E.
General
231. The continuous increase in traffic and general development kept this sub-department under continuous pressure and the lack of professional and technical staff, particularly of
224. A total number of 582 tests were made on the physical properties of cement and several brands new to the Colony were tested.
225. 343 tests were carried out on the physical properties, shearing strength, "Californian Bearing Ratio" values and salinity of various types of soils.
226. In the case of aggregate testing, a total of 1,048 tests were carried out during the year which included sieve analysis and tests on crushing strength, bulk density and organic im- purities.
227. 812 tests were made for the Hot Extraction of bitumen macadam and also 13 tests were carried out for other properties of bituminous materials.
228. Since the installation of the new Avery 50-ton universal testing machine in August, a total number of 166 tests had been carried out on mild steel rods for their tensile strength, per- centage elongation under load and quality when bent cold.
229. Other materials tested were hydrated lime, hollow tiles, wood wool slabs, fuel oil, rubber blocks and powder, and extracted quarry dust.
230. The following investigations were in hand:-
(a) The effect of powdered rubber on bitumen 80/100 and
M.C. 4.
(b) The stabilization of Hong Kong laterite soil by hydrated
lime.
(c) The apparent changes of volume of sand under submerged
and drained condition.
(d) The determination of the permeability and "C.B.R." values of Hong Kong laterite soil and its application to pavement design.
ROADS OFFICE
Chief Engineer (Acting), F. A. Fisher, B.Sc., LL.B., A.M.I.C.E.
General
231. The continuous increase in traffic and general develop- ment kept this sub-department under continuous pressure and the lack of professional and technical staff, particularly of
43
No comments yet.
Private notes are available after approval.