325 Basement Block

• Specification
• Working Procedure
• Documents

Composition and Manufacture:
Forticrete Stepoc blocks are manufactured to fine tolerances using aggregates which satisfy BS EN 12620:2002 and cement to BS EN 197-1:2000. They are manufactured at a plant which is registered under the BSI Registered Firms Scheme BS EN ISO 9001:2000

Dimensions: 325 x 325 x 225mm


Weight:  19.6kg

Characteristic Compressive Strength (fk): 18.0 N/mm²

Manufacturing Tolerances (mm):
Height: +2, -2
Length: +2, -2
Width: +2, -2

Concrete Infill: 0.19m³ per m² of wall

Fire Resistance:
Minimum fire resistance: 2 hours. For specific applications refer to BS 8110 Part 1 1997.


Resistance to Frost Damage:
The Stepoc system is resistant to the freeze-thaw conditions that are likely to occur below a damp proof course.

Resistance to Sulphate Attack:
Stepoc has adequate resistance to Class DS-3 sulphate ground conditions.

Step by step Construction Sequence

1. The concrete foundation needs to be level.
2. Vertical reinforcing bars are cast into the foundation at specific spacings.
3. The first course is bedded on mortar.
4. The horizontal reinforcing bars are tied to the vertical bars using tie wire.
5. The blocks are stacked dry to the height of the first pour.
6. The vertical faces should be checked on alternative courses for plumb.
7. Concrete is preferably pumped into the blocks, using a minimum C35/28 concrete with a minimum slump of 150mm and a maximum aggregate size of 10mm
   

Alternative methods to pumping may be used, provided that the fresh concrete can flow in a similar manner to pumped concrete and that the method of transportation and placing does not incur an additional risk to the stability of the wall. Mechanical vibration is unnecessary, and should not be used.

For further details please contact the Forticrete Technical department on 0800 262136 (option 2)