- Author
-
Blaine, R. L.
|
Arni, H. T.
|
Evans, D. N.
- Title
- Interrelations Between Cement and Concrete Properties. Part 2. Sulfate Expansion, Heat of Hydration, and Autoclave Expansion. Section 4. Variables Associated With Expansion in the Potential Sulfate Expansion Test.
- Coporate
- National Bureau of Standards, Washington, DC
- Report
-
NBS BSS 005,
July 1, 1966,
27 p.
- Keywords
-
cements
|
concretes
|
expansion
|
heat of hydration
|
portland cement
|
sand
- Abstract
- The relationships between the chemical characteristics of 183 portland cements and the expansion of mortar bars made of one part cement with 7.0 percent SO3 and 2.75 parts graded Ottawa sand were studied by computing multivariable regression equations with the aid of a digital computer and determining which of the independent variables had a significant effect on the expansion values. For cements containing 0 to 9 percent C3A, a linear relationship appeared adequate whereas a higher power of the C3A content was required with cements having 7 to 15 percent C3A. The principal variables other than the potential C3A content associated with the expansion were the Fe2O3 content and CaO/SiO2 ratio. Of the other commonly determined variables, the loss on ignition, insoluble residue and K2O content were associated with high expansion values of the low C3A cements. Certain minor constituents or trace elements such as SrO, Cu, Cr, Ni, P, V, and Zn also appeared to be associated with the expansion values of the cements. The use of the potential C3S content or the compressive strength of mortar cubes as variables indicated that high C3S was associated with cements having low expansion values as determined by this test.