Use for biodiesel waste

Hi, long question bear with me.
I just saw a doco on concrete, and the builder put 20l of his “secret concrete conditioner” into the truck just before the pour, he slipped up though and said that “glycerine” makes the mix more slippery so it flows better into the forms sets more quickly and gives a better surface finish. There was a shot showing him pour what looks like biodiesel glycerine into the mixer. Do you think that is what his secret concrete conditioner is?

27970cookie-checkUse for biodiesel waste

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It’s possible, but I’d be very surprised if 20L of anything into an entire truck would make any difference. He probably says it helps because he thinks it does – confirmation bias.