Quick thinking from engineers prevented cement from setting in the Victoria Line signal room which would have caused even further disruption to commuters.
Peter McNaught, operations director for the Bakerloo, Central and Victoria lines, said it was lucky workers knew sugar would stop the cement setting.
Normal service has resumed on the line after engineers worked throughout the night to repair the damage.
Workers attempting to clean up the cement-filled Victoria Line signal room rushed to a local supermarket to buy bags of sugar to prevent it from setting.
Victoria Line services were closed between Warren Street in the centre of the capital and Brixton in the south after a cement leak from a nearby construction area damaged the control room.
The problem has since been resolved and the line was once again running a good service.
The operations director for the Bakerloo, Central and Victoria lines paid tribute to the engineers who "worked tirelessly through the night" to repair the damage.
The Victoria Line returned to normal this morning after concrete was pumped out of the signalling room.
Peter McNaught, operations director for the Victoria Lines, said:
Our engineers have worked tirelessly through the night and have successfully repaired the damaged signalling equipment.
A good service is now operating across the Victoria line.
We again apologise to our customers who were affected by yesterday’s disruption.
A spokesman for Transport for London said the cement problem has been resolved and the Victoria Line is operating a good service.
London Underground's Victoria Line has reopened this morning after grinding to a halt when a cement leak damaged a signal control room.
The line was closed between Warren Street in the centre of the capital and Brixton in the south after the leak from an area where contractors were working on a long-term upgrade of Victoria Station yesterday.
– Peter McNaught, Transport for London
"We apologise for the delays and disruption to passengers travelling on the Victoria line today. Our engineers continue to work hard to repair the damaged equipment and get the line up and running as soon as possible.
"The line remains suspended between Warren Street and Brixton and this section will not run for the rest of the night. There is a risk that services on the Victoria line will start later than normal tomorrow morning.
"We therefore urge passengers to check before they travel."
– National Union of Rail, Maritime and Transport Workers spokesperson
"We understand that a foot of concrete burst into the control room having been poured into an escalator void.
We await further information but what we do know is that LU technicians are on site now working flat out to clear up the mess and get services back on line, proving once again that its directly employed public sector staff who are needed to deal with this kind of emergency, making a nonsense of Boris Johnson's tube staff cuts plans."
A rail replacement bus service is now in operation and will be serving stations between Victoria and Brixton.
It will not be stopping at Green Park station.