Concrete future - Concrete Mix Design, Quality Control and Specification - page 298

Figure 13.3 Placing of light pavement using geopolymer concrete.
the geopolymer concrete had no available bleed water rising to the sur-
face. To maintain adequate surface moisture for screeding, floating, and
troweling operations as well as provide protection against drying, an
aliphatic-alcohol-based surface spray was used throughout the entire
placement period (Figure 13.3).
The pavement slab for weighbridge at the Port of Brisbane was cast in
November 2010 using grade 32 MPa geopolymer concrete. Geopolymer
has also been used in footpath applications by various local councils.
Retaining wall
A total of over fifty 40 MPa geopolymer precast panels were used a retain-
ing wall for a private residence. The panels were up to 6 m long by 2.4 m
wide and were designed to retain earth pressure of 3 m. The precast panels
were cast in Toowoomba, Australia, and cured under ambient conditions
before being sent to site for installation (Figure 13.4).
Water tank
Two water tanks (10 m diameter × 2.4 m high) were cast in March 2011,
as seen in Figure 13.5. The first water tank was constructed using a grade
32 MPa concrete with a maximum aggregate size of 10 mm with blended
cement consisting of 80% Portland cement and 20% fly ash. The second
tank is constructed with a grade 32 MPa geopolymer concrete also with a
10 mm maximum aggregate.