|
| Title |
HIGH CALCIUM FLY ASH-TO SILICA FUME-TO SLAG SAND RATIO VERSUS COMPRESSIVE STRENGTH AND DENSITY OF CEMENTLESS CONCRETE
|
| Accession No |
00754912 |
| Authors |
PAVLENKO, S I; Myshlyaev, L P; Evtushenko, V F; Soin, A V; Bazhenov, Y M |
| Conference Title |
Fly Ash, Silica Fume, Slag and Natural Pozzolans in Concrete  |
Corp. Authors
/ Publisher |
American Concrete Institute
|
| Editors |
Malhotra, V M |
| Publication Date |
19980000 |
| Description |
p. 1117-26;
Figures(5); References(10); Tables(2) |
| Languages |
English
|
| Abstract |
The Siberian State Academy for Mining and Metallurgy (SSAMM) has developed a cementless fine-grained ash-slag concrete consisting of high calcium fly ash and slag sand from thermal power plants and containing silica fume. The composition and technology of the concrete has been patented. The compressive strength of the concrete is 5 to 20 MPa. It does not contain any natural or artificial aggregates (gravel, sand, clay, polystyrene). High-calcium fly ash combined with silica fume is used as a binder. The influence of the ratio of the above mentioned three components on the compressive strength and density of the concrete developed was studied using a computer technique. As a result, a three-dimensional integral scheme was designed for proportioning the concrete of a required strength (5 to 20 MPa) and density (2000 to 2500 kg/m cubed). The optimal mixture proportions for concrete of 20 MPa strength were as follows: Fly Ash, 30-40%; Slag Sand, 30-40%; Silica Fume, 3-4%; Water (60-80 degrees C), the rest. Concrete with optimum mixture proportions was used to investigate optimization of schedules of concrete heat treatment carried out in an automatic steam-curing chamber. Here, the three-dimensional system was involved as well: previous curing before heat treatment of 3, 6 and 12 hours; three schedules of a heat treatment i.e., 3(6)3, 3(9)3 and 3(12)3 hours cycles where (6), (9) and (12) hours are holding periods; three isothermal temperatures of 60, 80 and 100 degrees C. A computerized analysis of the investigation showed that heating of concrete during 9 to 10 hours at 80 to 100 degrees C with 6 to 7 hours of curing provided the best strength characteristics of the concrete. |
| TRT Terms |
Compressive strength ; Density ; Fly ash ; Mathematical models ; Ratios ; Sand ; Silica fume ; Slag ; Thermal power plants |
| Other Terms |
Cementless concretes; High calcium |
| Subject Areas |
H32 CEMENT AND CONCRETE; I32 Concrete |
| Report Number |
SP 178-58 |
| Availability |
American Concrete Institute |
| TRIS Files |
HRIS |
| Database |
TRIS Online |
|
TRT
