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concrete classes 25 20 and 15 20 what does it mean in singapore

concrete classes 25 20 and 15 20 what does it mean in singapore

When going through building plans I encounter construction jargon where I am instructed to cast class 25 20 or 30 of concrete What are these classes and how do I determine them where not given The grade 15 25 30 means the concrete compression resistanceor strength

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