How much plasticiser do I need for mortar?

The gauging water should be reduced accordingly to meet the required consistency. Add Thompson's Mortar Plasticiser to a rate: 150ml- 500ml per 50kg of cement, depending upon degree of plasticising required, or 2.5 lire per 200 litre drum of water. (The coarser the sand the greater addition rate required).

Can you use too much plasticiser?

Excessive use of plasticisers can have an adverse effect on the mortar. Lime added to mortars is well known for giving them a soft, putty-like consistency which can make them easier to work and retard their setting.

Do I need plasticiser in mortar?

Add plasticisers and other additives to the mortar mix to improve workability, but only if needed. Use only products specifically designed as a mortar additive. Use pre-mixed or factory-made mortar to ensure consistency throughout.

Do you need plasticiser for pointing?

The use of plasticiser in mortar is standard practice & not a special requirement of the Point Master.

Can I use Fairy liquid as a plasticiser?

"Washing up liquid affects the long term structural integrity of mortar and should never be used as a substitute for plasticiser."

Mixing sand and cement mortar using a plasticiser admix

What is the correct mix for repointing?

A typical mortar mix for Repointing purposes, for use in an area subject to normal weather conditions, would comprise 1 part Portland Cement, 1 part Lime and 5½ parts Sand.

How much plasticiser do I mix with?

Squeeze the bottle until the liquid in the cup rises to the correct level, 8 – 12ml per 25kg of cement is recommended for most uses.

How much plasticiser do I mix?

The gauging water should be reduced accordingly to meet the required consistency. Add Thompson's Mortar Plasticiser to a rate: 150ml- 500ml per 50kg of cement, depending upon degree of plasticising required, or 2.5 lire per 200 litre drum of water. (The coarser the sand the greater addition rate required).

Does plasticizer weaken concrete?

Adding an excessive amount of plasticizer will result in excessive segregation of concrete and is not advisable. Depending on the particular chemical used, use of too much plasticizer may result in a retarding effect.

How do you make mortar stick better?

What is the correct mixture for mortar?

Mixing Mortar by Hand

Measure out 4 parts sand and 1 part cement, and use a shovel to mix it dry on the platform. Make a crater in the middle of the mix, and add a bucket of water and the appropriate amount of lime or mortar additive. Mix thoroughly by shoveling the bottom of the mix to the top and repeating.

Why do builders put Fairy liquid in cement?

Welshdragon1 Active Member. Washing up liquid is designed to clean dishes not to improve mortar and whilst it does produce foam when mixed with water, it tends to entrain variable amounts of air containing large air bubbles as well as the small ones that we actually need.

Why is my mortar drying too quickly?

If left under the hot summer sun, thin set mortar will set up too fast – as if you had mixed it with warm water. Direct sunlight on hot, dry days can cause mortar to lose its moisture to the atmosphere. This weakens the mortar and might not allow it to hold up over time.

Why do they put lime in mortar?

Lime improves the plasticity and workability of mortar, while providing a high degree of cohesiveness it also spreads easily under the trowel.

What is the best mix for bricklaying?

Tip 2 – Mix the Mortar Correctly

For normal house bricks, a ratio of 4 parts sand to 1 part cement can be used. For slightly softer or second-hand bricks, use a ratio of 5-1. For very soft bricks, some bricklayers will go with a very weak 6-1 mix.

How do you mix mortar for pointing?

Mortar Mix for Pointing

The preferable mortar mix ratio for pointing is 1-part mortar and either 4 or 5 parts building sand. The ratio will vary depending on what exactly is being pointed. For bricklaying, you will usually want a 1:4 ratio with plasticiser added to the mixture.

What is cement plasticizer mortar?

Bostik Mortar Plasticiser (formerly known as Cementone Cemplas Mortar Plasticiser) is a blend of modified ligninbased surface-active agents free from chlorides. It improves the workability of mortar without the addition of lime.

How much PVA is in a mortar mix?

Sand, Cement and PVA Mix

To use in sand and cement, a mixture of 2 parts PVA to 1 part water is general. Tip the PVA in the water and mix as normal. PVA dries to a colourless finish and will not react with any other surface preparation or finish. Paint the surface with a coat of PVA before application of the mortar.

What Colour is mortar plasticiser?

Mortar Plasticiser, otherwise known as Pink Mix, is a pink coloured liquid admixture used in bricklaying and plastering mortars to aid workability and freeze thaw resistance.

Can you mix sharp sand and cement?

Sharp sand is mixed with concrete for a wide range of construction projects. Using sharp sand in concrete provides more strength and less flexibility compared to other types of sand.

What happens if you put too much cement in mortar?

Since major force transfer in a concrete/mortar matrix is from sand-sand interaction, excess cement will turn the mortar very brittle since cement particles cannot transfer normal contact force - they are good at providing shear strength.

What depth should repointing be?

As a general rule, the pointing to be repaired must be dug out to a minimum depth of about two-and-a-half times its thickness, in other words ¾ inch to one inch for regular 3/8-inch pointing. You need to dig at least ¾ inch deep for thinner pointing.

What is the ratio for brick mortar?

1:6 ratio of mortar for brickwork which means cement:sand = 1 part of cement and 6 parts of sand.