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Antiwashout underwater concretes

Moist Curing Period before Heat plus Autoclave Cure, days [Pg.213]

Property Type of Antiwashout Admixture Cellulose Type (MC) Hydroxyethyl Cellulose Type (HEC) Polyacrylamide Type [Pg.216]

Figure 8.7 Mechanism of antiwashoutability development by water-soluble polymer in antiwashout underwater concrete. ( 1991, JSCE, reprinted with permission.)... [Pg.215]

LMC is used in underwater concrete for both new construction and repair. The important requirements to obtain antiwashout capability, such as segregation resistance, flowability, self-leveling characteristics and lower bleeding are provided by the addition of viscosity-enhancing polymeric admixtures at polymer-cement ratios of 0.2-2.0%. These admixtures are water-soluble polymers, and classified under two groups, viz., cellulose types such as methyl cellulose and hydroxy ethyl cellulose and polyacrylamide types such as polyacrylamide and polyacrylamide-sodium acrylate [101]. [Pg.361]

Underwater concreting can be done by three methods the pumping of antiwashout concrete produced by the combined use of water reducing admixtures, superplasticizers and VEAs the use of tremies also using antiwashout concrete and the preplaced aggregate method discussed above. [Pg.477]

See other pages where Antiwashout underwater concretes is mentioned: [Pg.212]    [Pg.212]    [Pg.213]    [Pg.212]    [Pg.212]    [Pg.213]    [Pg.212]    [Pg.212]    [Pg.213]    [Pg.212]    [Pg.212]    [Pg.213]    [Pg.304]    [Pg.215]    [Pg.319]    [Pg.228]   
See also in sourсe #XX -- [ Pg.212 ]

See also in sourсe #XX -- [ Pg.212 ]



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