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Optimum workability and mechanical performance were obtained with a water to cement ratio of 0.24.
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Ambient cured geopolymer composites with very high compressive strength, i.e. more than 100 MPa were obtained with adequate workability by including an optimum amount of slag in low calcium fly ash geopolymer.
To evaluate the system, it was used to obtain a set of optimum concrete mixtures with wide ranges of workability (5 25 cm in slump) and strength (25 55 MPa in compression).
The results of this limited study indicated that increasing the rubber content led to an increase of the optimum binder content; the two rubber types had good workability with virgin and RAP mixtures; and the Superpave mix design method and volumetric analysis can be used for the rubberized asphalt mixtures containing RAP.
The chloride ion penetrability, water permeability and measured corrosion current were significantly reduced by replacing (CEM I) with either (CEM III/A) or (CEM III/A + FA) cements specially for large reinforced concrete cover having optimum cement content and minimum w/b ratio with suitable workability.
This initial study led to the development of an "optimum" RuC mix, comprising mix parameters leading to the highest workability and strength at all rubber contents.
Afterward, optimum binder-aggregate ratio of 8.75% was obtained based on workability, high temperature performance, and low temperature performance.
The optimum MK replacement level for cement was 10% from the viewpoint of workability and strength.
An optimum slag content of 15% seems to give a good SCC mixture with workability retention of about 60 min.
An improvement of workability was observed up to 20% of slag content with an optimum content of 15%.
The results showed that, generally, increasing additional water content increased workability, but decreased other fly ash based GPC properties and the optimum additional water content was found to be 30 kg/m3 which has slight effect on geopolymer properties.
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