C3S, also known as a-lite, is the compound that contributes to setting and early strength development of concrete. C2S, also known as belite, is the primary compound that contributes to later strength development of concrete. (from:http://www.fhwa.dot.gov/pavement/concrete/pubs/06080/chapt2.cfm)

my professor kept saying "latter strength", i'm not really sure what is correct. should it be really "latter" strength, or "later" strength? and how should it be pronounced correctly?

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