AIR ENTRAINMENT IN MORTARS AND CONCRETE: THE EFFECT OF SUPERPLASTICIZER/SALT COMBINATIONS
The use of salt-saturated solutions in mixing super plasticized mortars and concretes will sometimes lead to the entrainment of large quantities of air (in excess of 20 per cent, often as high as 50 per cent). The author describes a test to quantify the potential of various superplasticizers to entrain air when used in salt-containing mortars and concrete. A solid form of a sulphonated naphthalene formaldehyde condensate (SNFC) was mixed with saturated brine solution, with and without defoaming agents, and the level of foaming was measured. The test was repeated using 20 per cent active liquid sulphonated melamine formaldehyde condensate (SMFC) in place of SNFC. In the case of SNFC, reaction with the salt produced a large amount of relatively stable foam, only partially controlled by defoamers. In the case of SMFC there is less foaming and it can be effectively controlled with a defoamer. The test described is a simple one which allows quick determination of the potential for foaming. (TRRL)
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Availability:
- Find a library where document is available. Order URL: http://worldcat.org/issn/00088846
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Corporate Authors:
Pergamon Press, Incorporated
Maxwell House, Fairview Park
Elmsford, NY United States 10523 -
Authors:
- Grutzeck, M
- Publication Date: 1984-3
Media Info
- Features: Figures; References;
- Pagination: p. 297-299
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Serial:
- Cement and Concrete Research
- Volume: 14
- Issue Number: 2
- Publisher: Elsevier
- ISSN: 0008-8846
- Serial URL: http://www.sciencedirect.com/science/journal/00088846
Subject/Index Terms
- TRT Terms: Air entrained concrete; Air entrainment; Chemical reactions; Concrete; Concrete mixing water; Foaming agents; Measurement; Mortar; Plasticizers; Prevention; Salts; Sodium chloride; Superplasticizers
- Old TRIS Terms: Foaming
- ITRD Terms: 4742: Air entrained concrete; 4755: Concrete; 6136: Measurement; 4715: Mixing water (concrete); 4769: Mortar; 4725: Plasticizer; 9149: Prevention; 7156: Reaction (chem); 7332: Salt (chem); 7316: Sodium chloride
- Subject Areas: Highways; Materials; Planning and Forecasting; Security and Emergencies; I32: Concrete; I72: Traffic and Transport Planning;
Filing Info
- Accession Number: 00392438
- Record Type: Publication
- Source Agency: Transport Research Laboratory
- Files: ITRD, TRIS
- Created Date: Mar 29 1985 12:00AM