Determination of expansion of concrete:

As you all know that the cement and cement-based mortar as well as concrete undergoes shrinkage. But, for some of the applications like, bore hole filling, baseplate grouting, pressure grouting in the concrete to fill the voids, it is necessary to have the expansion property. Modern technology has invented the cement-based products which can expand by its volume.

Expansion of the newly installed material can be tested as per standard ASTM C 827.

In this testing, cast iron, rigid, strong, watertight mould is used to restrain the volumetric expansion from all sides and allow to expand at top. Testing material will be mixed and placed in the mould of different height and the increase in the height is measured.

Note:

1. For cement pastes, grouts, and mortars where all the aggregate will pass through a 4.75-mm sieve, use the 100-mm high mould.

2. For cementitious mixtures containing aggregate that will not all pass through a 4.75-mm sieve, but which will all pass the 12.5-mm sieve, use the 150-mm high mould.

3. For concrete mixtures having particles retained on the 12.5-mm sieve or larger, use the 300-mm mould.

For accurate reading purpose, make the following arrangement:

Result, the expansion property, i.e. the change in height is expressed in terms of percentage.

For site use, arrangement can be made as follows:

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