I know it is not exactly a timber frame question but there will be a timber frame set on top of it. I was planning to lay up a foundation of my local, free bluestone as opposed to hauling in a cement mixer and pump truck to do a pour. I have been contemplating using a lime mortar instead of the commonly used Portland cement due to the positive research results I have gotten from advocates of lime mortar, not to mention it is more traditional. Does anyone have any experience with lime mortars that might be able to help me get started?? Sources for quality lime? Recipe for slurry and finished mortar?Techniques for mixing and applying? Possible drawbacks to me opting to use lime instead of Portland?? Perhaps a Portland-lime mix? I would like the contrast of the white lime mortar in relation to the gray color of my Catskill bluestone. As far as techniques, I have read that back in the day the masons would mix a big batch of lime mixed with a high proportion of water, creating a soup-like consistency(called "lime slurry"). They would use this slurry when they needed to make mortar by scooping out the slurry and mixing it with some local sand. The lime slurry would be made in big batches and left to sit tightly covered and it would actually improve with time as long as it is kept airtight. Does this sound about right?? To make this slurry and have it be able to sit around a bit, suits me well in this project.I am just stating some of the details that have come to me in research, but I have absolutely no actual experience with lime mortar, so I am just wondering if anyone might have some guidance for me in this project?