Precast concrete materials, manufacture, properties and usage - Chapter 8 pdf
Precast concrete materials, manufacture, properties and usage - Chapter 8 pdf
... 1h
Non-air-entrained 0·50 0·30 0·20
Air-entrained 0·40 0·05 0·01
Fig. 8. 18. Defective kerbs with only partial replacement.
Copyright Applied Science Publishers Ltd 1 982
8. 5.3 Corrosion and reinforcement ... k=1·0 for concrete,
0·025 for expanded plastics.
Solid section: U (solid)=3· 08 W/m
2
°C
Concrete and plastics: U (sandwich)=0·44
On an area proportionality
U (panel)=0·44×...
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 ... condition and clean. Cover to steel
and its associated problems are discussed in Chapter 8.
1 .8. 2 ‘Reinforcing’ fibres and meshes
Fibres and meshes made from st...
Precast concrete materials, manufacture, properties and usage - Chapter 0 pot
... 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 SCIENCE PUBLISHERS LTD 1 982
All ... Publishers Ltd 1 982
PRECAST CONCRETE
Materials, Manufacture,
Properties and Usage
M.LEVITT
ARCS, BSc, DIC, PhD
Head—Materials Science De...
Precast concrete materials, manufacture, properties and usage - Chapter 2 pot
... as
Copyright Applied Science Publishers Ltd 1 982
2
ADMIXTURES
This chapter covers the range of admixtures used in precast concrete
products and mortars used with precast masonry. They are all used at
relatively ... 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...
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 6 pptx
... process a 4- or 8- drop would take place about every 15
seconds.
6.6.3 Wet and earth-moist mix presses
In the production of floor tiles the wet and earth-moist mix mentioned
for the five-stage process ... required 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 aggr...
Precast concrete materials, manufacture, properties and usage - Chapter 7 pptx
... tendency to globulation.
(c) Non-toxic, non-dermatitic and non-carcinogenic.
(d) No effect on the mould or formwork or lining other than its release
properties.
(e) Non-corrosive to metalwork.
(f) ... 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 few hours....
Precast concrete materials, manufacture, properties and usage - Chapter 9 ppt
... knowledge,
‘know-how’ and ‘alchemy’, and if one does not know what the variables
are doing at any one time control is lost. One can list the factors and
control variables one would use in precast manufacture ... all procedures in the manufacture and/ or testing
(Assessors and Company).
4. Keeping Record Cards on all machinery, equipment, etc. (Company
and Assessors). (See Chapte...
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