A lean mix of concrete is a weak mix (ie. Gen 1 or C10 for example). As for how waterproof a lean mix is compaired to a shotcrete mix, it would depent on what mix of shotcrete is used. Generaly speaking, whatever mix of concrete is used if it dose not have a waterproofing agent in it (ie. Sika 1+ Waterproofer for example) it wont be that waterproof. But if you want a staight answer, I would say shotcrete would be more waterproof, only because it tends to be a stronger mix. Regards Colin, a concrete batcher for Tarmac.
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"Debate" is a verb for discussion that typically involves exchanging arguments or opinions on a particular topic.
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