The phrase "a massive block of" is correct and usable in written English.
It can be used to describe a large, solid piece of material or substance, often in a physical or metaphorical context.
Example: "The construction crew was tasked with moving a massive block of granite to the site for the new monument."
Alternatives: "a large chunk of" or "a substantial piece of".
Nobody responds well to a massive block of text.
Reg Mead and Richard Miles found up to 50,000 silver and bronze coins, which remain clumped inside a massive block of soil.
From a distance it appears as if it once were part of the bridge above it, a massive block of concrete that somehow came unstuck.
On 18 April last year, a massive block of ice broke free and crashed down into the Khumbu icefall just above base camp, killing 16 Sherpas.
A massive block of Earth's crust, roughly 75 miles long and 37 miles wide, lurched 10 feet to the south Saturday over the course of 30 seconds.
Yet all is not smooth sailing as Mr. Barney attempts to explain his creative process while wrangling 45,000 pounds of petroleum jelly and a massive block of whale vomit.
That night's protest was huge, peaceful, and more like a massive block party than the "riots" of the days before.
Leaving the gym for work that same morning, I walked past the bakery to see what all the fuss was about, and instead encountered a massive, block-long line of people waiting for the shop to open at eight o'clock.
c Massive block of cemented carbonate scale-fragments clogging an outer heat exchanger surface within weeks to few months.
Longwood House, where Napoleon lived, gardened, plotted and died, is also part of France, and Betsy and others vividly describe its humidity, ceaseless wind (the island's turbine farm is just a few hundred metres down the road these days from Longwood), and the massive block of rock, called the Barn, which cramped the view of the sea to the east.
I looked at your photo of that massive block of poured concrete.
