Concrete rework & new variant: Strengthened concrete!

1. Stronger concrete:

It is agreeable that concrete has an amazing color palette, so it would make sense that lots of players would build with it. however, the strength of such a composite material in-game is rather weaker than expected, in both mining speed and blast resistance.
Amping up the concrete blast resistance would be appreciated to give strength to amazing structures built with it.
2. Strengthened concrete:

-In this chapter, I introduce a new variant for an existing Minecraft block called "Concrete".
description: a stronger concrete variant.
appearance: we have two possible styles, Style-A: Just like real R.C. the bars (Copper/Iron) are inside the block itself, giving it the same appearance as plain concrete. Style-B: Inspired by reinforced deepslate in the ancient cities, the bars (Iron/copper) line the corners of the concrete block, sacrificing the looks for the strength.
In-game attributes: Strengthened concrete is much more durable than its plain counterpart, taking a longer time to mine -somewhat close or equal to obsidian's-, and survives blasts like obsidian (Using copper bars is weaker than iron bars). It also cannot be pulled/pushed by pistons.
Why I think it is a great idea: The improvements made to such a block could impact how players build their world, giving them a beautiful strong block variant.