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Re: Masonry Question

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You guys haven't heard about all the mortar bond related failures of CMU
retaining walls lately?

That is just ridiculous. What's the mortar doing anyway in a retaining
wall, passing the compressive stress along between blocks? Slow day at the
planning dept...

On Tue, Jun 3, 2014 at 11:17 PM, Lloyd Pack, P.E. <
lloyd(--nospam--at)> wrote:

> Tarek,
> This seems odd to me.
> Type M mortar has the strongest compressive strength at a 28 day
> strength of 2900 psi, minimum.  While Type S mortar has a compressive
> strength of 2100 psi, minimum.
> The mix ratios for the different types are as follows:
> Type M: 1 Portland Cement, 1/4 Lime, 3.5 Sand
> Type S: 1 Portland Cement, 1/2 Lime, 4.5 Sand
> Type N: 1 Portland Cement, 1 Lime, 6 Sand
> Type O: 1 Portland Cement, 2 Lime, 9 Sand
> Mortar Types for Classes of Construction are:
> Type M : Masonry subjected to high compressive loads, severe frost
> action, or high lateral loads from earth pressures, hurricane winds, or
> earthquakes. Structures below or against grade such as retaining walls,
> etc.

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