How do you mix hydraulic lime mortar?

Mixing Hydraulic Lime

  1. Start with an empty mixer.
  2. Add one part sand.
  3. Followed by one part lime.
  4. Followed by two parts sand.
  5. Mix dry for at least five minutes.
  6. After five minutes slowly add water until the desired consistency is reached, it is very important not to drown the mix by adding too much water.

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Also to know is, can you reuse old lime mortar?

Old lime mortar can be crushed and re-cycled as a soil conditioner to balance the pH of soils.

Likewise, people ask, can you use hydrated lime to make lime mortar? Hydrated Lime is readily available at the local builder’s merchant and can be used to increase the workability of cement mortar. It is used more widely in schools and training centres where it is mixed with sand (no cement) to make a mortar that doesn’t set, ideal for teaching brickwork.

Consequently, do I add cement to lime mortar?

The addition of cement to lime mortars is a widespread, almost traditional practice, but few consider why it is done or the consequences. … A non hydraulic lime can be made to set much more rapidly by the addition of an hydraulic or ‘pozzolanic’ additive. This practice is known as ‘gauging’.

How do you mix lime cement mortar?

Mixing procedures

  1. Add ¾ of the water required.
  2. Add half of the sand.
  3. Add all of the Type S hydrated lime.
  4. Mix for two (2) minutes.
  5. Add all of the cement.
  6. Add the remainder of the sand.
  7. Add remaining water needed to obtain a workable consistency.
  8. Mix for three additional minutes or a total mix time of five minutes.

How long does hydraulic lime mortar set?

The mortar shouldn’t dry out too quickly – protect from sun, wind and rain with damp hessian cloth. Protect from rain if necessary. Build up to a maximum of 1 metre high at a time and then let the lime mortar cure for 2 to 3 days. When ‘green hard’, the joints can be brushed with a stiff brush to expose the aggregate.

How long should lime pointing be covered?

Summer protection is vital to stop lime mortars/plaster/paints from drying out too quickly from winds and direct sun – (hessian is ideal as it can be wetted down). Lime should be kept damp for at least 7 days from application otherwise it will just dry and crumble.

Should I add lime to mortar mix?

By adding hydrated lime to the mortar mix, the mortar has a greater plasticity. This means that we find the mortar easier to work with and shape for an elegant finish. By adding water to the lime mortar mix, this activates the calcium oxide in the lime. But this does not turn the mix into putty or a paste.

What do you mix with lime pointing?

The mix is typically 1 part lime : 2.5 parts sand. Measuring the material must always be with a gauging box or bucket.

What is the best sand for lime mortar?

washed sharp coarse sand

What is the difference between lime mortar and cement mortar?

Lime hardens much more slowly than cement-containing mortars, making it much more workable. Lime is also less brittle and less prone to cracking, and any cracked areas can absorb carbon dioxide and mend over time. Cement hardens very quickly, but may be too strong for some applications, e.g., working with old bricks.

What is the mix ratio for lime mortar?

A typical modern lime mortar mix would be 1 part lime putty to 3 parts washed, well graded, sharp sand. Other materials have been used as aggregate instead of sand.

What’s the difference between hydrated and hydraulic lime?

The more hydraulic a lime is the faster it sets and the higher it’s final strength, but this means that it is less breathable and flexible. … Hydrated lime simply means that a controlled amount of water is added to quicklime to make a powder that is more stable and safe to handle.

When should you use lime mortar?

The use of a lime mortar for pointing in general masonry allows you to use a material that is both porous and softer compared with mortars that feature cement. This allows the moisture to evaporate from the joints more effectively which reduces the level of moisture in the fabric of the building.

Why do you add lime to mortar?

Incorporating an appropriate proportion of hydrated lime into a cement-based mixture improves plasticity and workability, making the product easier to handle on the trowel. Hydrated lime also increases water retention which helps to improve the contact and bond with the substrate.

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