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CX FASTEST AC
CX FASTSET AC is supplied as a light yellow to white liquid. When added to cementitious mixes it accelerates hydration and enables the water content to perform more efficiently by dispersing agglomerated cement particles. Where there is embedded or prestressed steel or where sulphate resistant cement is used or when steam curing is employed, CX FASTSET AC should be replaced by CX FASTSET AN chloride free accelerating concrete admixture.
Uses: As an accelerator for use in concrete and cement mortar to give rapid strength development for early stripping of formwork and to help resist the effects of frost. Ideal for winter working.
Advantages
placing of concrete
Allows continued placing of concrete at low temperatures.
Reduces the water
Reduces the water content of concrete or mortar without loss of workability
Reduces segregation
Reduces segregation and increases density and compressive strength
Accelerates
Accelerates the hardening of floors and screeds.
Enables earlier
Enables earlier release from precast moulds thus speeding production
additional frost protection
Gives additional frost protection by reducing the low water content and accelerating hydration of cement
Mechanical Properties
| properties | Values |
| Specific gravity : | 1.30 – 1.31 at 300C |
| Chloride content : | Suitable for use with steam cured concrete. |
| Formwork surfaces | At the maximum recommended rate of addition, 3.4 liters/100 kg of cement, the Chloride ion concentration is 0.9% by weight of cement. In unreinforced concrete containing no embedded metal, CX FASTSET AC, at the recommended dosage rates may be used. |
| Non-staining | Does not stain concrete and can also be used safely with white cement. |
| Air entrainment: | General less than 1% additional air |
| Compatibility with other admixtures: | CX FASTSET AC is compatible with other CHEMAX admixture but should be added separately to the mix. Reduced air content may result when CX FASTSET AC is used in conjunction with some air entraining agents. Consult CHEMAX if other admixtures are to be used. |
| Compatibility with other cements: | CX FASTSET AC is compatible with ordinary and rapid hardening Portland cement but not high alumina or sulphate resisting cements. |
|
Workability : | The addition of CB FASTSET AC without reduction of the water content increases the slump and significantly improves concrete flow characteristics without decrease in concrete strength. |
|
Setting times: | Typical results using CX FASTSET AC are given in Table 1. |
|
Compressive strengths: | Typical performance with CX FASTSET AC is given in Table 2 . |
Table: 1
| MIX | W/C RATIO | SETTING TIME @ 200C | |
| INTIAL SET | FINAL SET | ||
| CONTROL | 0.59 | 4 HR 45 MINS | 6 HR 30 MINS |
| CX FASTSET AC | 0.55 | 1 HR. 30 MINS | 3 HRS. |
Table: 2
| Temp. | Admixture | Dosage/liter 100 kg OPC |
W/C Ratio | Compressive | strength | N/mm2 | |
| 200C | NONE | — | 0.59 | 10.00 | – | 34.7 | 42.0 |
| FASTSET AC | 3.4 | 0.55 | 22.2 | – | 49.7 | 57.6 | |
| 190C | NONE | — | 0.65 | 5.6 | 15.2 | 28.1 | 38.6 |
| FASTSET AC | 1.7 | 0.60 | 7.9 | 19.2 | 32.9 | 41.6 | |
| 50C | NONE | — | 0.65 | — | 5.4 | 16.7 | 30.9 |
| FASTSET AC | 1.7 | 0.60 | — | 8.0 | 21.0 | 35.9 | |
| 20C | NONE | — | 0.65 | — | 3.6 | 12.8 | 26.1 |
| FASTSET AC | 2.6 | 0.60 | — | 7.2 | 19.3 | 32.0 |
Application
