At Boral Concrete, we believe it’s important for
concrete contractors and finishers to undertake
a few simple precautions which will protect concrete
in hot weather and will make it easier to obtain the
best concrete job. > Download PDF
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Few areas in Australia experience temperatures low
enough to warrant elaborate and expensive protection
of freshly-placed concrete. But frosts, abrupt drops in
ambient temperature, and/or prolonged periods of cold
weather, are common in our winter seasons. Harmful
effects of these conditions on new concrete can be
avoided by relatively simple measures in ordering,
placing and curing.
> Download PDF
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The Techniques of Curing Concrete
Curing is the protection of fresh concrete from
evaporation and temperature extremes which might
adversely affect cement hydration. If concrete is to gain high percentages of its potential strength and durability. It must have -
1. sufficient water for the hydration of the cement
and
2. a temperature conducive to maintaining this
chemical reaction at a rapid, continuous rate. > Download PDF
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Vibration of concrete
Concrete for any structure must have a degree of
workability, while in a plastic state, which will permit it to be moved into the final position where it will be allowed to harden. Normally the plastic concrete flows around reinforcing in the forms into corners and other areas.
However, when the concrete is to be heavily reinforced
with small clearances between the bars and forms,
some mechanical aid is required to assist in the placing. Here vibration provides the best method for
consolidation of the concrete. > Download PDF
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Compaction and Strength
This brochure outline pictured of Test cylinders and overleaf were photographed during an experimental investigation to determine effects of different degrees of compaction on the compressive strength of concrete of various slumps. > Download PDF
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Adding Water to Plant Batched Concrete
Batched concrete is carefully proportioned and mixed to produce strength according to specifications. Less than half the water it contains is needed for hydration of cement. The rest of the water is there to make transporting and workability easier (by providing lubrication between sand/aggregate particles) and to ensure that there will be sufficient inherent water in the curing process. > Download PDF
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Pumping Concrete
For many years large-line concrete pumps, feeding pipes
greater than 200mm in diameter, have been used to
supply concrete to placing points in massive constructions. In addition, satisfactory, versatile small-line pumps, and the special concrete mixes used in them, have also been developed. > Download PDF
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Cracks in Concrete
The cracking phenomenon is complex and depends
upon a number of things - rate and amount of drying,
drying shrinkage, tensile strength, tensile strain, creep,elasticity, degree of restraint, structural design, curing and job site practice. > Download PDF
(0.71 Mb)
