Aging Effects in Field-Compacted Dredged Material
This paper contains the results of aging study performed on 365-day-old trial highway embankments constructed of field-compacted dredged material (DM), steel slag fines (SSF), and three DM-SSF blends. Key findings include that moisture content of the internal core at 365 days was essentially unchang...
محفوظ في:
| المؤلف الرئيسي: | |
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| مؤلفون آخرون: | , , , |
| التنسيق: | article |
| منشور في: |
2013
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| الوصول للمادة أونلاين: | http://hdl.handle.net/10725/3208 http://dx.doi.org/10.1061/(ASCE)HZ.2153-5515.0000154 |
| الوسوم: |
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| الملخص: | This paper contains the results of aging study performed on 365-day-old trial highway embankments constructed of field-compacted dredged material (DM), steel slag fines (SSF), and three DM-SSF blends. Key findings include that moisture content of the internal core at 365 days was essentially unchanged from the as-built conditions, and the bulk (major oxide) chemistry of the DM-SSF blends matched what was predicted by the field blending ratios. The addition of SSF to the 100% DM resulted in significant pH buffering and in strength increases up to a factor of 2, as measured by the average cone penetrometer test (CPT) tip resistance. Refusal ( or [Math Processing Error]) was encountered in the 100% SSF embankment at a depth of approximately 1.5 m. The 365-day aged 100% DM and [Math Processing Error] DM-SSF blend had effective friction angles on the order of 34 and 52°, respectively, where the dry DM content is reported first. Quantitative X-ray diffraction analyses indicated that no new crystalline phases were observed in the DM-SSF blends, such as those commonly associated with typical cementation reactions. For 365-day-old DM-SSF blends containing between approximately [Math Processing Error] (100% SSF) and [Math Processing Error] (100% DM) total arsenic, the 95% upper confidence limit on the average. As concentration from the combined toxicity characteristic leaching procedure/synthetic precipitation leaching procedure (TCLP/SPLP) leaching results was less than the SPLP detection limit ([Math Processing Error]), suggesting that the environmental risk associated with beneficially using the DM-SSF blends may be negligible. |
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