原文传递
EFFECTS OF MOISTURE ON SURFACE CHEMISTRY OF STEEL SLAGS AND STEEL SLAG-ASPHALT PAVING MIXES.
| 题名： | EFFECTS OF MOISTURE ON SURFACE CHEMISTRY OF STEEL SLAGS AND STEEL SLAG-ASPHALT PAVING MIXES. |
| 作者： | Coomarasamy-A; Walzak-TL |
| 关键词： | STEEL-SLAGS; ASPHALTIC-MIXTURES; PAVEMENT-CRACKING; FAILURE-; SURFACE-CHEMISTRY; MORPHOLOGY-; MOISTURE-SENSITIVITY; SCANNING-ELECTRON-MICROSCOPY; X-RAY-ANALYSIS; OPTICAL-MICROSCOPY; MINERALOGY-; X-RAY-DIFFRACTION; ELECTRON-MICROPROBE-ANALYSIS; CALCIUM-CARBONATE; CALCIUM-SILICATE |
| 摘要： | Random cracking and premature failure have been observed in some steel slag-asphalt pavements in Ontario. The causes of the failure were investigated. Surface chemistry and morpholoty of steel slags and asphalt mixes and the effect of moisture on these characteristics were studied using scanning electron microscopy, scanning electron microscopy coupled with energy-dispersive s-ray analysis, and optical microscopy. X-ray diffraction and electron microprobe analysis were used for mineralogical studies. Experiments were also performed to determine moisture uptake and volume expansivity of steel slags and steel slag-asphalt mixes. Basic oxygen furnace slags and an electric arc furnace slag were used in this investigation, and asphalt mixes were prepared from some samples. The results indicate that failure in steel slag-asphalt mixes in moist environments is due to the formation of calcium-rich deposits, mainly calcium carbonate, along the surface and the interface. This affects interfacial bonding and can cause excessive expansion of the slag leading to cracking of the mixture. This reactivity was also observed in field core samples, even after several years of service. The mineralogical data showed that the distribution and microstructure of the two main phases (an iron oxide-rich mixed oxide phase and a calcium silicate phase in steel slags) were different among the slags examined. The calcium silicate phase appears to be one of the sources responsible for the reactivity of steel slags in moist environments. |
| 总页数： | Transportation Research Record. 1995. (1492) pp85-95 (5 Fig., 4 Tab., 14 Ref.) |
| 报告类型： | 科技报告 |
相关文献
- PAVEMENT PERFORMANCE MODELING USING CANADIAN STRATEGIC HIGHWAY RESEARCH PROGRAM BAYESIAN STATISTICAL METHODOLOGY.
- CHARACTERIZATION OF BASE AND SUBBASE IRON AND STEEL SLAG AGGREGATES CAUSING DEPOSITION OF CALCAREOUS TUFA IN DRAINS.
- DETERMINATION OF ORIGINAL FREE LIME CONTENT OF WEATHERED IRON AND STEEL SLAGS BY THERMOGRAVIMETRIC ANALYSIS.
- UTILIZATION OF INDUSTRIAL WASTES IN LOW-VOLUME ROADS.
- Geomaterials 2014. 's Transportation Research Record: Journal of the Transportation Research Board, No. 2401.
- Material-Related Forensic Analysis and Special Testing: Assessment of Original Free Lime Content of Weathered Iron and Steel Slag; Final research rept. 21 Jan-22 Apr 00
检索历史
应用推荐
