Back to category:
Additives for the production of concrete
KUTRITard / Set retarding admixture
For more information see the documents:
Description and scope
KUTRITard is liquid set retarding admixture with with simultaneous plasticizing of concrete.
| PHYSICAL – CHEMICAL CHARACTERISTICS | |
|---|---|
| Appearance | Bright-yellow liquid |
| Density (20 °C), kg/m3 | 1030 – 1060 |
| pH value | 6,0 – 8,0 |
| Chlorides | Do not contain |
KUTRITard at normal temperatures delays setting of concrete from 3 to 48 hours, depending on the dosage.
Higher ambient temperature oscillations during concrete installation significantly affect the setting process. Increasing the temperature reduces retardation and vice versa.
By slowing down setting time, KUTRITard causes uniform crystallization of the concrete structure, which results in higher strengths compared to concrete of the same composition without additives. The strength gain begins immediately after the retardation period ends, and later exceeds the compessive value of the reference concrete.
KUTRITard also has a plasticizing effect that also make easier installation of concrete.
KUTRITard does not increase the amount of air drawn into the concrete and does not corrode the steel in the concrete.
Application
KUTRITard enables:
- control of setting time in long time intervals and in conditions of elevated temperatures
- long-term transport of concrete with mixers and pumps
- concreting of large monolithic structures, whereby by gradually reducing the dosage of KUTRITard, the simultaneous setting/hardening of the concrete mass is achieved.
In this way, the occurrence of large internal stresses and all the consequences that arise from them is avoided. It is known that the cement retardation and acceleration is strongly depend on the type of cement and temperature.
Therefore, for the desired retardation effect, it is necessary to experimentally determine the optimal dosage of KUTRITard with the use of all components intended for concrete. If any component of the concrete changes, especially the cement, during construction, it is mandatory to check the concrete recipe.
Dosage
KUTRITard is dosed 0.3 – 1.0% by weight of binder, depending on the required retardation time.
Doses greater than 1% can cause side effects.
KUTRITard is added to the concrete preparation water or directly to the concrete mixer.
Packing and storage
KUTRITard can be purchased in cans of 50 kg, 200 kg barrels, IBC containers of 1100 kg or in larger quantities.
KUTRITard is stable for 6 months in tightly sealed packaging.
