Did Mortar Tone Cause Crumbling?

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A couple of years ago I re-pointed the patio. But the mortar I used has crumbled as in the photo. I used a mix of cement sand and mortar tone. It was either 30-1 or 40-1 tone to mix. Has the mortar tone caused the mortar to crumble like this? Did I mix it wrong? Maybe I should have used more cement in the mix?

If so, what should I use? I wanted to match the existing pointing which is a buff yellow colour.

Thanks


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Joined
14 Jan 2020
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159
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2
Country
United Kingdom
I think I did use building sand - I must have. I probably used a 4:1 cement sand mix.
 
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