A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Slump Loss and Freeze-Thaw Resistance of Superplasticized Concrete
The influence of mix design and material selection on the slump gain and subsequent loss of superplasticized (flowing) concrete was studied. It was determined that the dose of the superplasticizer was the most critical factor and the optimum amount depends on both the admixture type and cement type. An overdose of admixture can lead to severe segregation and bleeding. This tendency can be reduced by decreasing the dose and using a higher cement content to maintain the same level of slump gain. Studies with mortars can be helpful in selecting the optimum dose of a superplasticizer, but there is not a close correlation between slump loss in mortars and in concrete. The concomitant use of a retarding water-reducing admixture may help to reduce the rate of slump loss. Slump is a satisfactory test for workability of superplasticized concretes. Superplasticized concretes can be satisfactorily air-entrained. Some adjustments may be needed for loss of air after superplasticizing, but if the final air content is within the usual recommended range then the concrete should be frost-resistant.
Slump Loss and Freeze-Thaw Resistance of Superplasticized Concrete
The influence of mix design and material selection on the slump gain and subsequent loss of superplasticized (flowing) concrete was studied. It was determined that the dose of the superplasticizer was the most critical factor and the optimum amount depends on both the admixture type and cement type. An overdose of admixture can lead to severe segregation and bleeding. This tendency can be reduced by decreasing the dose and using a higher cement content to maintain the same level of slump gain. Studies with mortars can be helpful in selecting the optimum dose of a superplasticizer, but there is not a close correlation between slump loss in mortars and in concrete. The concomitant use of a retarding water-reducing admixture may help to reduce the rate of slump loss. Slump is a satisfactory test for workability of superplasticized concretes. Superplasticized concretes can be satisfactorily air-entrained. Some adjustments may be needed for loss of air after superplasticizing, but if the final air content is within the usual recommended range then the concrete should be frost-resistant.
Slump Loss and Freeze-Thaw Resistance of Superplasticized Concrete
J. F. Young (author) / C. L. Hwang (author)
1983
129 pages
Report
No indication
English
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