High Early (HE)
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Type HE cement is manufactured under carefully monitored conditions at Golden Bay Cement's Portland plant, near Whangarei, for applications requiring high early strength gain or reduced setting times in concrete.
SUPPLY
Type HE cement is available on request in multi-walled paper sacks from Golden Bay Cement stockists and in bulk from the company's Customer Service Centres.
SPECIFICATION
Type HE cement exceeds the minimum specifications given in NZS3122:2009. Manufacture of all Golden Bay Cement products is monitored by the company's IANZ accredited laboratories. Type HE cement conforms to the requirements of NZS3122:2009 for use with aggreates of low alkali reactivity. Type HE cement is manufactured by grinding Portland cement clinker, gypsum, and limestone.
APPLICATIONS
Type HE cement is ideal for use in pre-cast aplications or casting operations where benefits can be made from shorter cycle times of moulds resulting in increased mould efficiency.
stabilisation.
Supplementary cementitious materials:
Type HE is compatible with Flyash, Silica Fume, and Ground Granulated Blast Furnace Slag conforming to the relevant sections of NZS 3122:2009.
Admixtures for concrete:
Type HE is compatible with concrete admixtures complying with NZS 3122:2009
TYPICAL PROPERTIES
| Type HE | ||
| Specific Surface Area | m2/kg | 430 - 450 |
| Sulphate Content | % | 2.1 - 2.3 |
| Loss on Ignition | % | 2.0 - 4.0 |
| Sodium Equivalent | % | less than 0.60 |
| Components (nominal) | ||
| Portland Clinker | % | 91 |
| Gypsum | % | 4 |
| Limestone | % | 5 |
| Cement Improver | CBA 1115 | - |
|
Typical Chemical Properties | ||||
| Units | Portland Clinker | Limestone | HE Cement | |
| SiO2 | % | 22.8 | 4.5 | - |
| Al2O3 | % | 4.2 | 0.5 | - |
| Fe2O3 | % | 2.3 | 0.6 | - |
| CaO | % | 64.8 | 51.8 | - |
| MgO | % | 1.0 | 0.8 | - |
| Na2O | % | 0.19 | 0.08 | - |
| K2O | % | 0.49 | 0.13 | - |
| Free lime (CaO) | % | 1.3 | - | - |
| Hypothetical Compounds | ||||
| Lime Saturation Factor | % | 97.0 | - | - |
| C3S | % | 68 | - | - |
| C2S | % | 14 | - | - |
| C3A | % | 7 | - | - |
| C4AF | % | 7 | - | - |
|
Typical Physical Properties | |||
| Units | HE Cement | NZS 3122:2009 | |
|
Setting time |
|||
| Initial | min | 75 | 45 min |
| Final | hr/min | 2.30 | 10.0 max |
| Soundness | mm | 1.0 | 5.0 max |
| SO3 | % | 2.5 | 3.5 max |
| Compressive Strength (ISO-CEN mortar) | |||
|
1 days |
MPa |
23.4 |
- |
| 3 days | MPa | 37.1 | - |
| 7 days | MPa | 49.0 | 25.0 min |
| 28 days | MPa | 64.3 | 40.0 min |
| Mortar Drying Shrinkage | |||
| 7 days | microstrain | - | - |
| 14 days | microstrain | - | - |
| 21 days | microstrain | - | - |
| 28 days | microstrain | - | 750 max |
|
Max Temp Rise |
°C | - | - |
