I conducted a visual analysis of a 24" concrete lined A106B line with design temperature of 80 C. Finding the thermal growth from an anchor point is simple, but how to consider the effects of the concrete lining on the steel's ability to thermally expand?

My understanding of the concrete lining is that of a thin layer which is uniformly sprayed along the inside wall of the pipe. Will it insulate the steel preventing a temperature change? Will it 'freeze' the steel from expansion due to it's own inability to grow?

Thanks,
Dmitriy