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Assuming that knowledge and resource locations are retained. Roman’s had great concrete. Took a long time to reestablish what Humans already had and mixing raw materials is not complicated.
After the Roman Empire, the use of burned lime and pozzolana was greatly reduced. Low kiln temperatures in the burning of lime, lack of pozzolana, and poor mixing all contributed to a decline in the quality of concrete and mortar
We need a Foundation project to restart society If we want to avoid this. Worst case solar cells becomes myth like Greek fire.
Universe 25 experiment. My take away from it is when society gets bored and loses goals it’s over. If the mice had some predators they probably wouldn’t have collapsed. Humans don’t have predators but have dreams that we worked toward amd stimulate us. Once we lose that it’s like what happened Walle. Stuck in a system slowly dying full of apathy.