feedback please

Dear All,
Thanks for the logo designs. I appreciate the designs but however we are not able to short list from them. May be we need to provide more requirements.

We are looking for something a logo which talks about laser screed flat floor finish of concrete floors, a promise or guarantee of good job done to customers. Our company would provide concrete flooring laying and finishing services for more durable, long lasting floors; Lastly we would be using fiber reinforcement techniques to make more durable, strong, and flatter concrete floors.

I am attaching / adding two concept design that we initially started with.
For colors, we think grey along with dark blue or Yellow or Green could be more appropriate. Please go thru the concept logo uploaded in the brief.

In the concept logo, the letter U is made to show laser finishing operation and precision of flatter floors, while the cube represents floor, or the shield in the second one represents warantee and durability. Just for thought.

Thanks for invitation can I have feedback pz?