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![Properties of concrete - Wikipedia, the free encyclopedia]()
en.wikipedia.orgConcrete has relatively high compressive strength, but significantly lower ... A 25% strength gain between 7 and 28 days is often observed with 100% OPC ...瀏覽：1144
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日期：2025-05-28
Concrete has relatively high compressive strength, but significantly lower ... A 25% strength gain between 7 and 28 days is often observed with 100% OPC ......
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