The phrase "a large buildup of" is correct and usable in written English.
It can be used to describe an accumulation or increase of something, often in a context where the buildup is significant or noteworthy.
Example: "There was a large buildup of snow on the roads, making travel difficult."
Alternatives: "a significant accumulation of" or "a considerable increase in".
Scientists at MIT and the Azerbaijan National Academy of Sciences analyzed more than 10 years' worth of GPS data from Baku and surrounding regions, discovering a large buildup of tension in the land.
Nor does it answer one of the big questions administration officials are wrestling with: how will Mr. Hussein react if there is a large buildup of conventional forces, such as the United States had in the gulf war.
Although Russia's economy is unlikely to support a large buildup of its missile forces, officials said the report found that it could again deploy shorter-range missiles along its borders and resume adding multiple warheads to its ballistic missiles.
A satellite-imaging program sponsored by the advocacy organization Enough Project has said it has evidence of a large buildup of Sudanese troops, as well as of the construction of new air-force bases near the border with South Sudan.
This triggered a large buildup of photons at one frequency, a hallmark of a laser.
With increased confidence in the reliability and responsiveness of logistics, they and the operational commanders were more comfortable with a leaner support system, which would enable a different kind of war plan one that could start without a large buildup of supplies and in which forces could strike deep without having to stop to move stockpiles.
Ms. Paradela said it was "too early" to tell whether the explosion would delay their return, or put off a larger buildup of people to help reconstruct the nation.
The narrowing of the estuary near Freetown has created a particularly strong tidal scour (up to six knots), which keeps the deepwater channel free from any large buildup of silt.
That has contributed to a large buildup in inventories of unsold goods, particularly at manufacturers.
Good arguments exist that the central regions should collapse first, producing a condensed protostar whose contraction is halted by the large buildup of thermal pressure when radiation can no longer escape from the interior to keep the (now opaque) body relatively cool.
