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Effects of superplasticizer on workability and flexural strength of autoclaved calcium silicates

✍ Scribed by M. Shirkavand; R. Baggott

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
696 KB
Volume
25
Category
Article
ISSN
0008-8846

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✦ Synopsis

Investigations are reported into the effects of superplasticizer type and dosage on the workability of a cement-silica mix with a range of liquid/solids ratios and on the flexural strength after autoclaving. The overall objective was to achieve as high strength as possible from pourable mixes. The results showed that flexural strengths as high as 25 MPa could be achieved by using an optimum combination of superplasticizer type, dosage and liquid/solids ratio. Such mixes had excellent flow characteristics enabling direct casting without any assistance from vibration. The dosages of superplasticizer per unit weight of cement plus fine silica, were found to be similar to those for normal cement, with 2% giving optimum benefits. A critical 0.25 liquid/solids ratio was found below which strength decreased and above which the conventional dependency found with cementitious systems was observed.

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