Precast concrete materials, manufacture, properties and usage - Chapter 4 pot
Precast concrete materials, manufacture, properties and usage - Chapter 4 pot
... 1982
Fig. 4. 4. Freeze-thaw % weight loss versus carbon/cement in wet-pressed kerbs.
TABLE 4. 7
DETAILS OF WET-PRESSED PAVING SLAB MIXES
Copyright Applied Science Publishers Ltd 1982
in Table 4. 4 and ... 0·32 0· 34 0·36 0·38 0 40
Observed and cost-corrected-relative-to-control failing loads (flexure)
are shown in Table 4. 13. It can be seen that F/C over 0·37 detrimentally
affects...
Precast concrete materials, manufacture, properties and usage - Chapter 0 pot
... concrete
I. Title
691′·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 Scie...
Precast concrete materials, manufacture, properties and usage - Chapter 2 pot
... CONTROL STRENGTH FOR 24 HOUR OLD 4/ 1 MORTAR CYLINDERS
TABLE 2.2
24 HOUR AND LATER AGE COMPARATIVE STRENGTH FOR 4/ 1, 0.5 W/C
MORTARS
Copyright Applied Science Publishers Ltd 1982
2 .4 WATER REPELLENTS
These ... properties of the fresh and/ or the hardened material. The
chapter excludes additives such as ground blast furnace slag and
pulverised fuel ash (fly ash), the latter be...
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 ... characteristic strengths above 40 N/mm
2
, nor some
sandstones above 50 N/mm
2
.
(f) Aggregate variations affect physical, chemical and architectural
properties and ve...
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 5 ppt
... off
up to a 240 V 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 handling ... 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 int...
Precast concrete materials, manufacture, properties and usage - Chapter 6 pptx
... 1 4
Sand 1 54 5 –3·0
Cement 100
Water 40 +1 4 3·0=38 4 = Added water
40 = Effective or
free water
40 +1 4+ 1·5 =42 ·9 = Total water
Admittedly one would not work to such accurate batch weights in a
precast ... 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...
Precast concrete materials, manufacture, properties and usage - Chapter 7 pptx
... normal-cured
concrete.
Flexural strength at 4 24 hours old is the practical consideration as
concrete is subject to bending during demoulding and handling. If, for
example, one aimed at and achieved ... 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 8 pdf
...
Concrete and plastics: U (sandwich)=0 44
On an area proportionality
U (panel)=0 44 ×0·8+3·08×0·2=0·97 W/m2
°
C.
It may be seen that it is quite easy to undertake one’s own calculations,
and ... days before
cleaning and scrubbing the surface.
8 .4 SITE HANDLING AND USAGE
With a good deal of sense 90% of the site problems that occur with
precast products could be avoided, an...
Precast concrete materials, manufacture, properties and usage - Chapter 9 ppt
... all procedures in the manufacture and/ or testing
(Assessors and Company).
4. Keeping Record Cards on all machinery, equipment, etc. (Company
and Assessors). (See Chapter 5.)
5. Calibration of all ... 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...
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