If the Hempcrete is lime or cob based, I support the practice. I do not support the portland industry at all, as little as possible.
slip form concrete and hempcrete and how people felt about each one.
Hempcrete is permeable (breaths) to moisture diffusion. Portland based products are not in general and hold onto moisture which contributes to other issues such as molds.
I was also wondering if it was possible to combine the two as it would seem like they would be compatible.
Ordinary portland cements (OPC as it's called in the industry) is not as infallible as you would think. Look at our highways and bridges. Do some research on the negative aspects of portland.
I really like the idea of slip form concrete as a way to build a very permanent and low maintenance structure, it would at least seem to be more durable and rot-resistant than many other techniques.
No, not by a long shot.
Portland cement obviously isn't the most green or sustainable of items...
Yes, in theory, but would that be the best use of resources for the area you build. Look to the vernacular in an area, if you want to know what the most enduring architectural form is.
...could frame the house in hempcrete blocks and then use slipform to cover both the inside and outside of the blocks.
Depends on the mix ratios, application, and load requirements placed on it from the wall and roof diaphragms.
...is hempcrete sturdy enough to use as a substitute for portland cement?
would the stones in the slipform compromise the insulating properties of the hempcrete?
Remember Daniel, whenever you incorporate a component into the overall infrastructure of a building, you inhibit serviceability and augmentation of that component. When designing, think modulare whenever possible and/or applicable. Bricks and timbers in a timber frame are modular components that can be serviced much easier than many of their counterparts use in the modernity of contemporary architecture.
would it be feasible to incorporate a rocket mass heater into the design of the slipform itself, I would think that the thermal mass of the house would also help to store and radiate heat.