Question $4$

A concrete cube is made using a concrete mix with $600g$ of water, $1200g$ of cement and $2800g$ of

aggregates. Based on Power's relationship, i$.$e$.$

$f_c=234x^3$

where $f_c$ is the compressive strength and $x$ is the gel$/$space ratio, what is the compressive strength of

this concrete cube when hydration in this cube has reached $60\%?$