Why was Roman Concrete Forgotten during the Middle Ages?

Why was Roman Concrete Forgotten during the Middle Ages?
from Medieval History Book https://l.facebook.com/l.php?u=https%3A%2F%2Fyoutube.com%2Fwatch%3Fv%3DdbvvlFHCNn4%26feature%3Dshare&h=AT3SnLiu5CaLtGT4l0ON3srlCLB-KjnbLgXMK8Wz1JrXZvey4ZjLTILi9eBtXG6teFBfmeB0nrfntSOdDRByz_8XG_oRMnOMH2OWa9H2vBUAzR2hDjhygRE5SgDonzgV2sluix4sUuvUtf41LZrI&s=1
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