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Additional resources for Precast concrete: materials, manufacture, properties, and usage

Sample text

Lime bloom masking black pigmented wet-cast blocks. (b) Carbon black pigments have been discussed earlier but one consideration is the appearance of the mix which takes on an oily, viscous, low workability character even though none of these characteristics actually obtains. No more water should be added to these concretes or mortars than is necessary for the required preassessed workability. (c) Autoclaving generally has a lightening effect on the colour and some colours are not suitable for use at autoclaving temperatures; the manufacturers will advise on this matter.

The most popular admixture is the same as the cellulose used for wallpapering. The common basic chemical is methyl ethyl cellulose used as a 0·5–1·0% w/v solution in the gauging liquid for the mortar. Such mortars are virtually unaffected by dry high suction surfaces and stay workable Copyright Applied Science Publishers Ltd 1982 for a period up to about two hours even at temperatures as high as 40°C and at relative humidities down to 10%. 1 Vibrated reinforced and unreinforced concretes (reinforced units only if permitted by regulations).

In effect, this means an interim W/C with improved workability. 5 illustrates this effect. 5 TYPICAL EFFECT OF PLASTICISING ADMIXTURE ON PROPERTIES OF A VIBRATED CONCRETE PRODUCT The dosage rates vary from 100 to 1000 ml/50 kg cement and each type should be dispensed at the same time as the mixing water. As far as Copyright Applied Science Publishers Ltd 1982 selection is concerned, much of this appears to be a function of the grading of the fine aggregate. The coarser sand mixes benefit more with the lignines, whereas the finer dune sands work better with the carboxylic derivatives.

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