"preserve infrastructure" is correct and usable in written English.
You could use it to talk about the need to protect and maintain existing infrastructure, either because it is important for development or in order to avoid the need for costly replacements. For example: "Our city needs to prioritize preservation of existing infrastructure in order to ensure sustainable development."
To preserve infrastructure longevity in a cost-effective manner, the research in pavement design and infrastructure management has been growing rapidly in recent years.
The new office was soon commissioned to rebuild a bridge which had been destroyed, contrary to Speer's instructions to preserve infrastructure.
Iraq's ambassador to the United States, Lukman Faily, said in a telephone interview Thursday that his government wants to preserve infrastructure for what he called the "day-after scenario," should the government regain control.
While the federal government pumps money into some states to construct high-speed rail systems, the Dinky controversy between preserving infrastructure and using transit buses becomes all the more pointed.
Once we have acknowledged that WSPs can be trusted, we can start to build the trust, security and privacy preserving infrastructures that cloud service providers require, by relying on these trusted third parties to operate parts of the security infrastructure.
This workshop only focused on technical aspects of privacy, but there are many other components, such as social and legal controls, that need to be accounted for when erecting privacy preserving infrastructures.
The need to preserve this infrastructure can contribute to political pressure to maintain or increase military spending.
When the fighting began, Azerbaijan appealed to Russia, asking it to preserve its infrastructure in Georgia — a port, an oil terminal and a pipeline.
Concrete bridge deck deterioration is a significant problem that must be addressed to preserve highway infrastructure investments in bridges around the world.
CON proponents have long argued that the law helps preserve rural infrastructure.
The government has said it will not attack the port and will seek to preserve key infrastructure.
