What is the effect of re-tempering with super plasticizer on
The effect of re-tempering with super plasticizer on concrete can be different depending on some factors. Temperature, time of concrete in the mixer, original dosage of the plasticizer,...
RETEMPERING OF CONCRETE - TRO India
increase in the super plasticizer used for retempering is quite straightforward with mixing time and the relationship is statistically significant with a coefficient of correlation of 0.998. It is clearly seen that an additional super plasticizer of about 0.7% by weight of the cement content is needed at the end of a mixing
Effect of substitution of cement with rice husk ash on
In this paper, the effect of different contents of Rice Husk Ash (RHA) added to concrete containing super plasticizer and with and without plastic fibers on its compressive strength has been studied. Samples with 3%, 5%, 7%, 10%, 12% and 15% content of RHA replacing the cement have been tested.
Effects on Properties of M25 grade concrete mix using
determine the optimum quantity of admixtures and to study the effect of over dosage of super plasticizer and retarder. After casting, normal curing was carried out on the concrete samples until the 28 th day. The aim is to study optimum dosgage and over-dosage effects of super plasticizers and retarders on compressive strength,
Superplasticizer | Concrete Plasticizers | Polycarboxylate Ether
Superior plasticising effect, resulting in improved flow, placing and compaction; Chloride free – does not attack reinforcement; Packaging: 5 kgs, 20 kgs and 220 kgs. Dosage: 200 ml per 50 kg bag of cement. Optimum dosage can be determined by site trials. We have three types of superplasticizer admixture for concrete. Super Plasticizers PC 50
- Does retempering with super plasticizer affect concrete properties?
- When retempering with super plasticizer, there are no detrimental effects on fresh as well as hardened concrete properties even under the unfavorable high ambient temperature of 60 C (140 F). The performance characteristics are the same for concretes mixed at higher ambient temperatures and retempered with super plasticizer.
- What is the effect of super plasticizer on concrete?
- The effect of the super plasticizer is the increase of the workability of the concrete in case of use of low water/cement ratios. Additionally the porosity of the concrete is reduced.
- Is re-tempering with superplasticizer harmful?
- The good news are that at the end, the final strength usually will not be affected when retempering with superplasticizer, because if you do so with water, the strength will be affected dramatically. Re-tempering with chemical admixture (need proper mixing after re-tempering, at east 70 revolutions in 2/3 minutes in transit trucks) is not harmful.
- How much super plasticizer is needed for retempering concrete?
- It is clearly seen that an additional super plasticizer of about 0.7% by weight of the cement content is needed at the end of a mixing period of 30 min for retempering to restore the initial slump of concrete, and it is only about 1.2% by weight of the cement at the end of 150 min of mixing.
- What happens after 60 min of retempering?
- This is because after 60 min of retempering, the concrete loses its flexibility, and remixing the concrete after that time will not allow the concrete particles to attach together again. The concrete without any additives had the maximum shear and impact strength after 60 min of retempering.
- Does retempering time affect workability?
- As the retempering time increases, workability decreases. When compared to other types of retempered concrete, the workability of retempered concrete produced with 20% silica fume replacement and an additional 5% cement and water has a poorer workability.
