During December and January temperatures fluctuate a lot on North Carolina, but the average temperature has still been above freezing, and although one has to be careful that concrete does not freeze, cooler temperatures are better than hot to work with concrete. I am casting heads from rubber molds for the S.C. project now. My goal is one hundred casts from 17 different molds. I have a small mixer and work with a 160 lb mix that includes various colorants, and additives that can make very strong and long lasting concrete. On of the most interesting additives is pozzolon- vitreous materials (ground glass or fly ash) that add chemical and weather resistance to concrete. Some people claim that the volcanic ash that the Romans routinely added to their concrete had a pozzolonic effect that allowed their concrete to last so long.
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