Vincent
T. H. Chu
is renowned internationally as
walking
encyclopedia of civil engineering.
Author of a number of
widely acclaimed
civil engineering books, Mr Chu is recipient of various reputed awards
including Young Engineer of
the Year Award 2008
(Merit) by the Hong
Kong
Institution of Engineers &Ombudsman’s
Award 2007 (under
complaint-related category). He is also listed
in
11th Edition of Marquis Who's
Who in Science and Engineering. ConcreteBasics.org
thanks him for his exemplary contribution to the cause of civil
engineers
around the world.
Normally after
the laying of sub-base layer of the paving slab/interlocking blocks, a
30mm
thick sand bedding is screeded and tamped over the pavement area. Then
paving
slabs are laidhorizontallywithjointsof2-3mmwideandarelaidinuphilldirection.After
completing the
laying of paving slabs, sand used for filling joints is spread over the
surface
of the units and brushed into the joints such that all joints are
completely
filled. The paving slabs are then bedded into final position by using
plate
vibrators.
The sand layer
serves the purpose of normal blinding layer under concrete structure
i.e.
Provide a level
and flat surface for the paving slab/interlocking blocks to lay
on;
Protect the
foundation (i.e. underground subgrade and sub-base layer) against adverse
outside conditions (e.g. bad weather) during construction of the
laying work of
paving slab/interlocking blocks.
*****
Reference:200
Questions and
Answers on Practical Civil Engineering Works by
Vincent Chu
