Mixing Morter


Old 02-14-00, 07:25 AM
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I am a do it yourselfer and I need to lay about 200 12" blocks. Its been a few years since I have done this. Could someone tell me what type of morter cement I need and appx. how many bags. Also how mush sand will I need and what is the sand to cement mix ratio. The temperatures will be around 40 to 55 degrees. Will I need to add lime? If so, how much
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Old 02-16-00, 07:40 PM
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There are a number of different mortars and way to make them, but, the following is fairly simple. The mix ratios are based on the UBC tables.

Mortar Types:
Each type supersedes the former in
compressive strength.
Type - typical use.
O - "non-load bearing" Interior/Exterior & not subject to weathering.
N - "load bearing" Interior/Exterior above grade.
S - at or below grade or when more strength is needed.
M - below grade or subject to heavy loads.
* In some locations Type M must be used for ground contact, and S
for exposed walls.
Select a type. Guessing, use Type S.

Within the volume ratios the main variable is Type S Lime. Portland is always 1, Masonry Sand is always 2 1/4 to 3. Thus only lime content is listed.

O Over 1 1/4 to 2 1/2
N Over 1/2 to 1 1/4
S Over 1/4 to 1/2
M 1/4

An average plus waste for 12" block is 7.5 Cu. Ft. per 100. For each 1 Cu. Ft. of sand there will be about 1 Cu. Ft. of mortar.
Sand = 15 Cu. Ft. or 80 (dry weight) * 15 = 1200 lbs. or 1600 damp.
If sacked use #80.
Portland = 15 / 3 = 5 sacks (2.5 per 100)
5 * (? Lime content) = sacks Lime.

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