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| CUBE MOULD |
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The standard size of cube is 150 mm.
The moulds for the specimens must be made of cast iron or cast steel. The inside faces must be machined plane. The cube mould is normally made in two halves to facilitate removal of the concrete cube without damage. Each mould has a base, which is a separate metal plate, preferably fastened to the mould by clamps or springs. When assembled, all the internal angles of the mould must be right angles.
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HOW TO USE
Before assembling the moulds, make sure that there is no hardened mortar or dirt on the faces of the flange that prevent the sections from fitting together closely.
These faces must be thinly coated with mould oil to prevent leakage during filling, and a similar oil film should be provided between the contact surfaces of the bottom of the mould and the base. The inside of the mould must also be oiled to prevent the concrete from sticking to it. The two sections must be bolted firmly together, and the moulds held down firmly on the base plates.
After the concrete has been remixed, immediately fill the cube moulds and compact the concrete, either by hand or by vibration. Any air trapped in the concrete will reduce the strength of the cube. Hence, the cubes must be fully compacted. However, care must also be taken not to over compact the concrete as this may cause segregation of the aggregates and cement paste in the mix. This may also reduce the final compressive strength.
While finishing off the surface of the concrete, if the mould is too full, the excess concrete should not be removed by scraping off the top surface as this takes off the cement paste that has come to the top and leaves the concrete short of cement. The correct way is to use a corner of the trowel and dig out a fair sample of the concrete as a whole, then finish the surface by trowelling. |
| F.O.B |
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| GROUTING PUMP |
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The grout pump is a simple
but efficient low cost equipment ideally suited for grouting
cable ducts in small and medium sized pre-stressed concrete
members.
It is hand operated stirrup pump of the diaphragm type
in which grout is drawn up the suction pipe past a simple
non return ball valve, and on the pressure stroke is driven
forward into the feed hose through a similar non-return
valve. Site trials of grouting of ducts in normal beams
can supply 130 litres of neat cement grout per hour. The
maximum work pressure is 3 Kg/cm2 (40 psi) |
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| FARMA |
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The standard size of cube is 150
mm.
The moulds for the specimens must be made of cast iron
or cast steel. The inside faces must be machined plane.
The cube mould is normally made in two halves to facilitate
removal of the concrete cube without damage. Each mould
has a base, which is a separate metal plate, preferably
fastened to the mould by clamps or springs. When assembled,
all the internal angles of the mould must be right angles. |
Click
here for Query... |
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