The chancellor is planning to overhaul Britains pensions system in an effort to increase infrastructure investment by billions.The Treasury has confirmed reports suggesting pension reform to boost growth will be one of the key messages of a major speech that Rachel Reeves is set to make in the City of London on 14 November.Source: HM Treasury / FlickrThe chancellor has reportedly been taking a detailed look at how UK pension funds can be put to better useAccording to The Times, Reeves favours Canadian-style pension reform, which would mean merging 400bn worth of local authority pension schemes.The chancellor met with the executives who run these schemes in August.> Also read:Government continues to work on long-term deal for TfL to fund major schemes like Bakerloo extensionThe newspaper quoted city sources as wanting further reforms to free up 225bn worth of surpluses held by defined benefit pension schemes.Reeves speech could also include detail on how the government plans to use the extra borrowing created by changes to the governments debt rules in last weeks Budget.Markets had a shaky reaction to the Budget, with ten-year gilt yields spiking after the chancellor left the Commons chamber on Wednesday before stabilising on Friday.A Treasury spokesperson said: Following this weeks budget to fix the foundations of the UK economy, the chancellor is focused on growth. Central to that are the next steps on pension reform, which will be set out in her Mansion House speech. This will unlock more private investment to fuel the governments growth mission.The annual Mansion House address is often used by the chancellor to set out the governments plans for the economy and the financial sector.