Precast concrete materials, manufacture, properties and usage - Chapter 0 pot
Precast concrete materials, manufacture, properties and usage - Chapter 0 pot
... concrete I. Title691′·3 TA683·7ISBN 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.LEVITTARCS, BSc, DIC, PhDHead—Materials Science Department,John Laing Research and Development Limited,Borehamwood, ... of HalifaxRedland Tiles LimitedRocla Pipes LimitedThermalite Limited Copyright Applied Science Publishers Ltd 1982 PRECAST CONCRETE Materials, Manufacture, Properties and Usage Copyright...
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Precast concrete materials, manufacture, properties and usage - Chapter 2 pot
... with strongerdipole yet short-lived ( 30 60 minutes) forces. Their addition rates arerather higher than for plasticisers and range approximately from 200 to 200 0 ml/ 50 kg depending upon the effect ... 2.5TYPICAL EFFECT OF PLASTICISING ADMIXTURE ON PROPERTIES OF A VIBRATED CONCRETE PRODUCTThe dosage rates vary from 100 to 100 0 ml/ 50 kg cement and eachtype should be dispensed at the same time ... theconcentration range 0 00 05 0 05 %anhydrous calcium chloride byweight of cement. These concentrations are likely to arise in practicefrom, for example:(a) Using a mixer for a non-chloride mix without...
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Precast concrete materials, manufacture, properties and usage - Chapter 4 pot
... following F/C ratios and approximate total water contents wereused:F/C 0 0·25 0 37 0 50 0·63 0 75Total water 0 28 0 32 0 34 0 36 0 38 0 40 Observed and cost-corrected-relative-to-control failing ... weight)The mix, ash and water variations were as follows:F/C 0 0·25 0 50 1 00 1· 50 2 00 Total water 0 35 0 39 0 43 0 50 0·58 0 65Table 4.11 lists the 14 day old flexural strengths in N/mm2 ... only one fly ash and F2 was selected. Theworks mix was a 3/1 by weight sand/ordinary Portland cement mix witha sand grading:Sieve No. Passing %1·18 mm 100 600 µm 95 300 µm 50 1 50 µm 5The following...
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Precast concrete materials, manufacture, properties and usage - Chapter 1 pdf
... cone flower pot units, etc., and when properly constructed and used have a lifetime of 200 – 100 0 uses. Figure 1.6 illustrates a GRP-U-section gulley unit mouldwhere the resin has a white silica ... relevantto precast concrete manufacture leaving mix design to Chapters 5 and 6.1.5.1 Cement typesThe most common cements used are ordinary and rapid-hardeningPortland (including white), sulphate-resisting ... mould and on the reinforcement, with loss in appearance and bond, respectively.Where this is unavoidable and the cement has 10 ppm of chromiumor less a little potassium chromate solution (0 00 1%...
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Precast concrete materials, manufacture, properties and usage - Chapter 3 ppsx
... concrete colourBoth the desk-top 100 mm square sample and the 300 mm 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 orchemical release agents. Ordinary mineral mould oils and oil-in-water emulsions promote streaking and staining.(c) Pan-type mixes are preferred ... hydrated-then-dried mixturesof cement and pigment which are squeezed between glass plates and compared against a white background. The German test uses a blend ofbarytes and pigment and two...
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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 ... devices such as clamp-on and poker vibrators arehigh-wear-rate pieces of machinery and a sufficient supply of sparesshould always be kept.9. Poker vibrators need plenty of room and full immersion ... concrete is beneficial if the concrete is re-vibratable and the cost of double handling moulds or vibrators is economical.14. Properly designed concretes cannot be over-vibrated. The only timedanger...
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Precast concrete materials, manufacture, properties and usage - Chapter 6 pptx
... Science Publishers Ltd 1982Water 40+ 20+ 30= 90= Added or total water 40= Effective or free waterThe two W/C ratios are 0 40 and 0 90. 6.1 GENERAL PRECAST WET-CAST PRODUCTIONProducts in this ... clean 0 4% 0 150kg sand 1 0% 3 0% 100 kg cement40kg effective waterThe granite needs 1·2 kg water to cater for its absorption. The sand has3 0 kg excess water in it, (3 0% –1 0% )×150kg.The mix ... be:Batch weight (kg) Water requirement (kg)Granite 300 1·4Sand 154·5 –3 0 Cement 100 Water 40+ 1·4–3 0= 38·4 = Added water 40 = Effective orfree water 40+ 1·4+1·5=42·9 = Total waterAdmittedly one would...
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Precast concrete materials, manufacture, properties and usage - Chapter 7 pptx
... of natural aggregate concrete contains about 200 0 kg aggregate and lightweight aggregateabout 1 200 kg, the exotherm from the same cement content will result ina higher concrete temperature ... 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. Any method ... limestone concrete caused less cracking in the finishedproduct. One can understand this by comparing the aggregate and concrete properties: Thermal expansions/°C× 10 5Aggregate Limestone 0 45 Flint...
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Precast concrete materials, manufacture, properties and usage - Chapter 8 pdf
... effect as the following typical readings in m1/m2/s show: 10 min 30 min 1hNon-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 ... factor of 10; i.e.20dBA is about 2× 10 -4 N/m2, and so on. Equivalents in real terms are:Less than 10 An eerie silence 10 20 Birds in a garden 20 40 Conversation 40 50 In a theatre 50 70 Radio ... 4Part sandwich cladding panel 1 50 mm thick with 50 mm cast-inexpanded plastics panel taking up 80% of area. k=1 0 for concrete, 0 02 5 for expanded plastics.Solid section: U (solid)=3 08 W/m2...
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Precast concrete materials, manufacture, properties and usage - Chapter 9 ppt
... theprevious 3 days.Day of casting no. 10 min 30 min 1 h1 0 20 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 0·166 0 09 0 07 0 05 One would need to look at the curing ... 10 blocks/day testing: Average of 10 blocks м 0. 9 × specified strength + 0. 62 × standarddeviation Day no. Average of 10 Standard 0 9×7 0 Accept/deviation (σ) +0 62 σreject51 7·4 0 5 ... that could well obtain in precast concrete operations.Example 1: Dimensions of cladding unit ex-mould No. 3 wherespecifications are: x= 301 5 +0 10 y=25 50+ 0– 10 z=1 50+ 3–3(all in mm)Copyright Applied...
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