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Sakrete makes a surface bonding cement for building mortarless walls: https://www.lowes.com/pd/Sakrete-50-lb-Cement/3340656

I doubt that's what the robot is using, but it is a faster way to build block walls by hand. https://youtu.be/p_ZopnZ94Uc?feature=shared

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something tells me that if the contestants that used the bonding cement had taken a mortar approach, they would have still finished in half the time as the other two :)

I'm aware that it's a promotional video for a product, but in my own experience as a former masonry worker, it is still faster. And a layperson who is bad at gapping mortar correctly can get it right if the first blocks are level

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