Latest revision as of 03:36, 31 July 2020

There are several ways to mix mortars.

In almost all cases the dry components are mixed first, then water is added and mixed in. There are also times when mixes are used dry.

Cement mixer

Very popular, but too expensive and bulky for small jobs. Storage is often impractical. Often cost effective to buy one for a job then resell afterwards.

Always rinse out before the cement sets if you want the machine to last well.

Can be used to break soft bricks down into powder/pieces which can be incoporated into some mortars. See Pozzolan for information.

Can also be used to break glass into cullet. Add the glass and add a hard brick. Ditto scrap tiles.

Paddle Mixer

See Paddle mixer

Better suited to paints and lime mortar than cement.

When used with haired or fibre reinforced mortar mixes these tend to form 'dead mice' on the paddles (clumps of hair).

Hand held paddle mixers for use in drills put a lot of load on a drill. A high power low speed mixing drill should be used. Using paddles in a cordless drill is pushing it.

A small makeshift paint mixer can be made by bending some 2mm iron wire if you keep the shaft short and the stirrer narrow. These are only usable for paint mixing, not mortar.

Board & Shovel

Mix sand & cement dry on board. Make a ring of the mixture. Add a little water in the middle and fold the dry mix in. Repeat until mixed.

It's not practical to use a plastic sheet instead of the board, the rigidity is needed.

Sandpit

185px

This is a flat board with raised edges. Mix dry materials, then add water and mix in. No need to maintain a ring of mixture to prevent water escape, making it quicker.

Bucket & Shovel

Don't fill too full, or you won't be able to mix. Over half full is hard to mix. Some tendency not to mix material at the bottom well, so the bottom of the mix needs extra attention.

Fast Bucket Method

For small amounts it's faster to toss the bucket than mix with a small shovel. The bucket needs to be a quarter full or less. Shake the bucket rapidly up & down in an oval () shaped motion, and the contents go round and mix very quickly. At 2 tosses a second, a batch can be done in 20 seconds once the water is added. Energetic work, but very quick.

Tarpaulin

Place tarp on the ground, in a shallow hollow depression if available. Mix dry sand & cement, add water, then 2 people lift opposite corners alternately to mix the mortar. Quick.

Mortar Board

Very small amounts can be mixed on a hand held mortar board with a trowel. The same ring technique is used as with a full size board.

Mega mixer

For really large batches it is possible to make a giant mixer driven by a car engine. These can be scaled up versions of a cement mixer for cement mortars, or a giant version of a food processor for Papercrete and similar formulae.

Suited to large cement mixing jobs, Papercrete and similar mixtures. Making one is not a trivial exercise. Purchasing an industrial mixer is prohibitive.

http://www.livinginpaper.com/mixers.htm

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 There are several ways to mix [[Mortar Mixes|mortars]].
@@ Line 6: / Line 5: @@
 =Cement mixer=
-Very popular, but too expensive and bulky for small jobs. [[Storage]] is often impractical. Its often cost effective to buy one for a job then resell afterwards.
+Very popular, but too expensive and bulky for small jobs. [[Storage]] is often impractical. Often cost effective to buy one for a job then resell afterwards.
 Always rinse out before the [[cement]] sets if you want the machine to last well.
-Can be used to break soft bricks down into powder/pieces which can be incoporated into [[Mortar Mixes|mortars]]. See [[Pozzolan]] for information.
+Can be used to break soft bricks down into powder/pieces which can be incoporated into some [[Mortar Mixes|mortars]]. See [[Pozzolan]] for information.
-Can also be used to break glass into cullet. Add the glass and add a brick. Pick a hard brick rather than a soft one.
+Can also be used to break glass into cullet. Add the glass and add a hard brick. Ditto scrap tiles.
-Ditto scrap tiles.
+=Paddle Mixer=
+See [[Paddle mixer]]
+Better suited to [[Paint|paints]] and [[Mortar Mixes|lime mortar]] than cement.
+When used with haired or fibre reinforced [[Mortar Mixes|mortar mixes]] these tend to form 'dead mice' on the paddles (clumps of hair).
-=Paddle Mixer=
+Hand held paddle mixers for use in drills put a lot of load on a drill. A high power low speed mixing drill should be used. Using paddles in a cordless drill is pushing it.
-Better suited to [[Paint|paints]] and [[Mortar Mixes|lime mortar]].
-When used with haired or fibre reinforced [[Mortar Mixes|mortar mixes]] these tend to form 'dead mice' clumps of hair.
+A small makeshift paint mixer can be made by bending some 2mm [[iron wire]] if you keep the shaft short and the stirrer narrow. These are only usable for [[paint]] mixing, not mortar.
 =Board & Shovel=
 Mix [[sand]] & [[cement]] dry on [[Sheet Materials|board]]. Make a ring of the mixture. Add a little [[Water|water]] in the middle and fold the dry mix in. Repeat until mixed.
+It's not practical to use a plastic sheet instead of the board, the rigidity is needed.
 =Sandpit=
-This is a flat [[Sheet Materials|board]] with raised edges. Mix dry materials, then add [[Water|water]] and mix in. The advantage is its not necessary to maintain a ring to prevent [[Water|water]] escape, so work can be quicker.
+[[image:Cement mixing tray 5421-3.jpg|right|185px]]
+This is a flat [[Sheet Materials|board]] with raised edges. Mix dry materials, then add [[Water|water]] and mix in. No need to maintain a ring of mixture to prevent [[Water|water]] escape, making it quicker.
 =Bucket & Shovel=
-Don't fill too full, or you won't be able to mix. Half full is comfortable, more soon becomes hard to mix. Some tendency not to mix [[:Category:Materials|material]] at the bottom well.
+Don't fill too full, or you won't be able to mix. Over half full is hard to mix. Some tendency not to mix [[:Category:Materials|material]] at the bottom well, so the bottom of the mix needs extra attention.
 =Fast Bucket Method=
-For small amounts its faster to toss the bucket than mix with a small shovel. Move the bucket rapidly in a banana '''(''' shaped motion, and the contents will go round and mix very quickly. At 2 tosses a second a batch can be done in 20 seconds once the [[Water|water]] is added.
+For small amounts it's faster to toss the bucket than mix with a small shovel. The [[Hand Tools|bucket]] needs to be a quarter full or less. Shake the bucket rapidly up & down in an oval '''()''' shaped motion, and the contents go round and mix very quickly. At 2 tosses a second, a batch can be done in 20 seconds once the [[Water|water]] is added. Energetic work, but very quick.
-Works best when the [[Hand Tools|bucket]] is a quarter full or less.
 =Tarpaulin=
 Place tarp on the ground, in a shallow hollow depression if available. Mix dry sand & [[Mortar Mixes|cement]], add [[Water|water]], then 2 people lift opposite corners alternately to mix the [[Mortar Mixes|mortar]]. Quick.
-=Rubble bag=
-Mix by kneading the mass of [[Mortar Mixes|mortar]] through the [[:Category:Plastics|plastic]]. Use of pointed or square cornered tools not recommended. Not the best method.
-=Drum=
-A drum with securely fitting lid can be used as an unpowered cement mixer. Mixing is much easier if you bolt a bar or 2 down the side on the interior, like the paddles in a motorised cement mixer. Turn by hand or roll along the ground to mix.
-The drum can be whatever size suits you, so size and cost are typically much less than for a powered mixer. This often makes [[Storage|storage]] practical.
 =Mortar Board=
-Very small amounts can be mixed on a hand held mortar board with a trowel.
+Very small amounts can be mixed on a hand held mortar board with a trowel. The same ring technique is used as with a full size board.
@@ Line 62: / Line 57: @@
 For really large batches it is possible to make a [http://www.livinginpaper.com/mixers.htm giant mixer] driven by a car engine. These can be scaled up versions of a cement mixer for cement mortars, or a giant version of a food processor for [[Papercrete]] and similar formulae.
-Only suited to large cement mixing jobs, [[Papercrete]] and similar mixtures. Making one is not a trivial exercise.
+Suited to large cement mixing jobs, [[Papercrete]] and similar mixtures. Making one is not a trivial exercise. Purchasing an industrial mixer is prohibitive.
 http://www.livinginpaper.com/mixers.htm
@@ Line 68: / Line 63: @@
 =See Also=
-* [[Mortar Mixes]
+* [[Mortar Mixes]]
+* [[Paddle mixer]]
 * [[Special:Allpages|Wiki Contents]]
 * [[Special:Categories|Wiki Subject Categories]]
@@ Line 78: / Line 74: @@
 [[Category:Building]]
 [[Category:Construction]]
+[[Category:Masonry]]
+[[Category:Basics]]

Difference between revisions of "Cement mixing"