I did not attend, but I’ve been curious about this topic.
A question that comes up frequently for us is cast-in-place PT concrete podium vs precast podium (in the case of a 1-2 story concrete podium under 4-5 stories of light framed wood residential construction). We design a lot of both types of podiums, and historically the decision is driven by economics and owner/contractor preference.
There are certainly some benefits of precast along the lines that you mentioned, but there are also drawbacks - for example, we historically have exerted less control over the concrete mix used by the precaster, as it is a delegated design, and they often use a very high cement content so the concrete gains strength quickly and they can cycle through their forms quickly. The structural design of the two systems is also fundamentally different, so there is an inherent difference in material quantities, but I don’t have a definitive comparison yet.
Has anyone done a proper study they can share comparing the embodied carbon of a precast vs cast-in-place podium or some other common prefab vs non-prefab design alternative? Otherwise, this is on my eventual to-do list…