Precast concrete materials, manufacture, properties and usage - Chapter 6 pptx
Precast concrete materials, manufacture, properties and usage - Chapter 6 pptx
... and the hand process is time-
consuming. After the trowelling or rolling-in, the unit is subjected to a
wash-off, sand-blast or other suitable technique to expose the aggregate.
Fig. 6. 6. Precast ... occur
Fig. 6. 26. Feedhopper for wet-pressed product.
Fig. 6. 27. Secondary hopper feed.
Copyright Applied Science Publishers Ltd 1982
Fig. 6. 30. Three-stage wet press machine.
Fig. 6...
Precast concrete materials, manufacture, properties and usage - Chapter 7 pptx
... expansion and a lower modulus of elasticity than a flint gravel
concrete, and both these factors will result in reduced stresses.
7.2 RELEASE AGENTS AND RETARDERS
Release agents for heat-cured concrete ... up and gains strength slowly; a warm-starting concrete, say 25°C,
warms up and gains strength more quickly; and a concrete starting at,
say 40°C, can be handled within a f...
Precast concrete materials, manufacture, properties and usage - Chapter 0 pot
... concrete
I. Title
69 1′·3 TA683·7
ISBN 0-2 0 3-4 905 7 -6 Master e-book ISBN
ISBN 0-2 0 3-7 988 1-3 (Adobe eReader Format)
ISBN 0-8 533 4-9 9 4-0 (Print Edition)
WITH 40 TABLES AND 109 ILLUSTRATIONS
© APPLIED ... Publishers Ltd 1982
PRECAST CONCRETE
Materials, Manufacture,
Properties and Usage
M.LEVITT
ARCS, BSc, DIC, PhD
Head—Materials Sci...
Precast concrete materials, manufacture, properties and usage - Chapter 1 pdf
... relevant
to precast concrete manufacture leaving mix design to Chapters 5 and 6.
1.5.1 Cement types
The most common cements used are ordinary and rapid-hardening
Portland (including white), sulphate-resisting ... pre-wetted prior to mixing with the
cement and additional water. Some limestones and sandstones have
a slower absorption rate, and workability requirements need to be...
Precast concrete materials, manufacture, properties and usage - Chapter 2 pot
... Vibrated reinforced and unreinforced concretes (reinforced units
only if permitted by regulations).
2.2 (a) and (c) as 2.1 and pressed and extruded products.
2.2 (b) ready-mixed mortars delivered ... and ordinary Portland cements with levels of C3A well under
10% and sulphate-resisting cements are the only types that will
apparently benefit. The choice is between the use of plasti...
Precast concrete materials, manufacture, properties and usage - Chapter 3 ppsx
... concrete colour
Both the desk-top 100mm square sample and the 300mm square hand-
portable samples are misleading in the case of unpigmented materials,
and for coloured concretes and mortars they seldom ... agents should be water-in-oil emulsion creams or
chemical release agents. Ordinary mineral mould oils and oil-in-
water emulsions promote streaking and staining.
(c) Pan-type...
Precast concrete materials, manufacture, properties and usage - Chapter 4 pot
... series of
works-manufactured, laboratory-tested pneumatic-hammer-compacted
precast concrete kerbs. The results may be related to any hand machine
or mass machine process where earth-moist mix designs ... the
user, and in this respect vibrated concrete can only take a few per cent of
ash and it is hardly economic to set up a second silo in a precast concrete
factory to handle suc...
Precast concrete materials, manufacture, properties and usage - Chapter 5 ppt
... accurate and consistent quantity of
concrete into the mould.
In some precast processes tilting tables are used both to cast the
concrete and lift the mould and concrete into the near-vertical ... 240V or three-phase supply under closely supervised
nominally dry conditions.
13. Re-vibration of concrete is beneficial if the concrete is re-vibratable
and the cost of double ha...
Precast concrete materials, manufacture, properties and usage - Chapter 8 pdf
... defective concrete in toto and replace with good quality
concrete.
Most of the experience with alkali-aggregate reaction is that the defect
manifests itself after the steel has corroded and the concrete ... is no solution to the resistance-to-
sulphate problems when concrete is not properly made. The
intermediate-permeability concretes are those categorised by (c), and
even wi...
Precast concrete materials, manufacture, properties and usage - Chapter 9 ppt
... 0 .62 × standard
deviation
Day no. Average of 10 Standard 0·9×7·0 Accept/
deviation (
σ
) +0 62
σ
reject
51 7·4 0·5 6 61 A
52 7·3 0 6 6 67 A
53 7·1 0·8 6 80 A
54 7·0 1·0 6 92 A
55 6 9 1·0 6 92 ... 0·12 0·09
2 0·10 0·07 0·05
3 0·13 0·08 0· 06
4 0·09 0· 06 0·04
5 0·37 0·20 0· 16
6 0·09 0·07 0·05
One would need to look at the curing conditions on day number 6 that
affected the curi...
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