Mortar for Block work.

Hi All, I am laying some block piers and have a few questions I was hoping someone might be able to help me with. I have searched and searched and have found some great info on regular brick laying, but have not been able to get alot of info on block laying. The number one essential for good brick laying the mortar. I am having dificulties getting the mix right. I am using 6 sand - 1 GP cement - 1 Hydrated Lime - 20mls Bycol/8 litres of clean water. The sand has only a little clay...

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