"blockage of" is a perfectly valid part of a sentence in written English.
It can be used to describe an obstruction of something, for example: "The blockage of the river caused flooding in the nearby town."
Sedation involves a drug-induced blockage of anxiety and fear.
This also leads to a blockage of electrical conduction.
A left knee injury was cited - "a blockage of the knee" was the translation.
Police warned them that their planned blockage of the road would be against the law.
This blockage of waterways causes flooding, providing a micro-habitat for organisms that carry disease.
Roughly 10 more were taken into custody during a second blockage of market.
It was their way or the highway – or, as it turned out, blockage of the highway.
He also suffered from sleep apnea, which is characterised by blockage of the airways.
More serious is the sheer fluency with which Arthur expounds the blockage of his emotions.
"Blockage of this magnitude is quite unusual for someone so young," Siegel said.
"Further tests have shown he suffered a temporary blockage of a small blood vessel in his brain.
