- Author
-
Blaine, R. L.
|
Arni, H. T.
|
Clevenger, R. A.
- Title
- Interrelations Between Cement and Concrete Properties. Part 1. Section 2. Water Requirements of Portland Cement.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
-
NBS BSS 002,
August 20, 1965,
20 p.
- Keywords
-
cements
|
concretes
|
test methods
|
statistical analysis
|
portland cement
|
water
- Abstract
- The relationship between cement characteristics and the water requirements of neat cement pastes, mortars, and concretes made with 199 portland cements of different types and from various areas were studied by fitting multivariable regression equations with the aid of a digital computer. The principal variables which appeared to have the greatest effect on water requirements were as follows: (1) For neat cement pastes of normal consistency - fineness; (2) for the 1:4 and 1:2.75 mortars of standard consistency - the air content, Al2O3, and silica modulus; (3) for concretes - the air content, Al2O3, and Fe2O3. The use of A/F ratios or the potential C3A values in place of the Al2O3 values in the computations resulted in concordant equations. Other commonly determined variables as well as a number of the minor constituents and trace elements also appeared to be associated with the water requirements to a lesser degree.