What is the difference between Conventional Water-Reducing Admixtures & SuperPlasticizers?
The primary difference between these admixtures and conventional water-reducing admixtures is that high range water reducing (HRWR) admixtures, often referred to as [gn_highlight bg=”#DDFF99″ color=”#000000″]superplasticizers, may reduce the water requirement by more than 30%, without the side effect of excessive retardation.[/gn_highlight]
Potential Advantages of HRWR:
- Significant water reduction;
- Reduced cement contents;
- Increased workability;
- Reduced effort required for placement;
- More effective use of cement;
- More rapid rate of early strength development;
- Increased long-term strength; and
- Reduced permeability.
Potential Disadvantages of HRWR:
- Additional admixture cost (the concrete in-place cost may be reduced);
- Slump loss greater than conventional concrete;
- Modification of air-entraining admixture dosage;
- Less responsive with some cements;
- Mild discoloration of light-colored concrete; and
- Air-void and color blemishes on exposed and formed finishes.