26
MODERN QUARRYING
October - November 2013
IQSA SYMPOSIUM
FEEDBACK
Senyard also included a comparison
between rigid frame off-highway trucks
and articulated units.
The Concrete Society’s
John Sheath
, who
needs no introduction to the industry,
discussed
Concrete in Action
. Introducing
the Concrete Society to the delegates, he
says its mission is to promote excellence
and innovation in the use of concrete and
to provide a forum for networking and for
the sharing of knowledge and informa-
tion on concrete.
Discussing the synergy between con-
crete and aggregate, he says the use of
coarse and fine aggregates in concrete
provides significant economic benefits
for the final cost of concrete in the first
place. “Aggregates typically make up
some 60-75% of the volume of a concrete
mixture, and as they are the least expen-
sive of the materials used in concrete, the
economic impact is significant.”
In addition, the use of aggregates pro-
vides volume stability to the hardened
concrete.
Looking at the recently-held Fulton
Awards, he says the aim of these awards
which are made symbolically to the struc-
ture, and presented to the entire team
responsible for its design and construc-
tion, “is to recognise and reward excel-
lence and innovation in the design and
use of concrete.”
Categories and winners were:
Civil engineering structure: Two
commendations were awarded
for the Chota Motala Interchange
– incrementally launched bridge,
Pietermaritburg and the CRCP and
UTCRP pavements on the N12 high-
way, Gauteng. The winner was the De
Hoop Dam, NR Steelpoort, Limpopo
Province.
John Sheath.
Freek van Rooyen.
Andrew Nicholson.
Simon Tose.
Building structure: The new Alexander
Forbes headquarters in West Street,
Sandton received a commendation,
with winner being the Sanral Head
Office in Pretoria.
Architectural concrete: Two com-
mendations went to The Podium
at Menlyn, Pretoria, and the Sanral
head office in Pretoria. The Alexander
Forbes Head Office in Sandton took
top honours in this category.
Innovative construction: There were
two commendations, these being
the Mahatma Gandhi Road Sewer
Extension project in Durban, and the
UTCRCP and CRCP – N12 Freeway;
with the winning project going to The
Podium at Menlyn, Pretoria.
Innovative construction: The two
commendations went to the UTCRCP
and CRCP – N12 Freeway project; and
the Mahatma Gandhi Road Sewer
Extension in Durban. Project winner
was The Podium at Menlyn.
Sustainable concrete: Two commen-
dations went to the Gauteng Freeway
Improvement Project – Package E,
and the Koeberg Interchange. The
winner was the De Hoop Dam.
The Fulton Award judges were Peter
Kleynhans, SAICE president; Sindile
Ngonyama, SAIA president; and John
Sheath, CSSA chief executive.
A complete list of these awards can be
found on the Concrete Society’s interac-
tive website:
.
Freek van Rooyen’s
presentation was on
the much vaunted issue of diesel rebates.
His paper outlining
The Diesel Rebate
Scheme
discussed the reasons behind
the attack on the quarrying industry; the
requirements; audits; enforcement and
dispute resolution.
Umhlaba Environmental Consulting’s
Andrew Nicholson
presented the first
paper after lunch, where he gave over-
view of the
Environmental Management
Programme Report and the Environmental
performance audit
. Nicolson outlined
the legal requirements of an EMPR and
an EPA, together with common findings
and recommendations from undertak-
ing numerous EPAs. He strongly recom-
mended that operations take care when
choosing a service provider for environ-
mental monitoring.“You must request the
provider to provide results within a rea-
sonable timeline; explain why monitoring
locations/parameters are being chosen;
that they provide results as a trend over
time; and explain results and where pos-
sible, link these results to activities.
“It is imperative that you designate a
person to evaluate results as received and
to raise concerns when they don’t make
sense,” Nicholson says.
AEL’s
Simon Tose
is a very popular
speaker at IQSA events, and his presenta-
tion on
How Boosters shape your Blast
was
no exception.
Looking at the cast primer or booster,
he says this provides a vital link between
the small, low energy detonator and the
massive, relatively insensitive, explosive
charge.
Tose described several common
myths such as the one where a cast
primer needs to be as near as possible
to the diameter of a blasthole. “This is
not true,” he says. “Cast primers need to
get bigger as holes get bigger, but their
energy and pressure is such that they are
able to initiate charges effectively in holes
much larger than themselves.”
Bauma Africa’s
Elaine Crew
was invited
