Need a book? Engineering books recommendations...

Return to index: [Subject] [Thread] [Date] [Author]

Vintage 1923 CA concrete building

[Subject Prev][Subject Next][Thread Prev][Thread Next]
The 1927 UBC (first edition!) has a table showing the minimum compressive strength of concrete to be 1500 psi, requiring 8-1/4 gallons water per sack of cement (94# sack = one cubic foot).
1:2:4 means cement / sand / aggregate -- by volume..
Yes, a core sample is essential!
 
Hugh Brooks