• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>International Journal of Soil, Sediment and Water >Dredge Material Stabilization Using the Pozzolanic or Sulfo-Pozzolanic Reaction of Lime By-Products to Make an Engineered Structural Fill
【24h】

Dredge Material Stabilization Using the Pozzolanic or Sulfo-Pozzolanic Reaction of Lime By-Products to Make an Engineered Structural Fill

机译：使用石灰副产物的火山灰或磺化火山灰反应进行疏edge材料稳定化，以制造工程结构填料

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Large contracts are being awarded to remove and find beneficial uses for dredge spoil. An example is the Delaware Deepening Project which encompasses over 100 miles of the Delaware River. One of the challenges is to find economical and environmentally suitable means to stabilize and solidify (S/S) the solids so they can be reused for structural fill and/or cover soil. This lab study demonstrates the methodology and results of using three sustainable industrial by-products that can compete with Portland cement. They are lime kiln dust (LKD), Class F coal fly ash, and spray dryer ash (SDA). SDA is the residue from spray dryer absorbers, a more common type of advanced sulfur dioxide gas scrubber that uses lime. There are existing spray dryer installations in the Middle Atlantic States and several new units are coming on-line in Massachusetts and New Jersey. These spray dryers could provide an inexpensive S/S additive and an opportunity for CO2 credits. These industrial by-products were investigated to determine their potential for stabilizing and solidifying the dredge solids from the Cox Creek confined disposal facility (CDF) for Baltimore, MD with the objective of making a structural fill material. Another lab study utilized harbor dredged material from the USCOE Ft. Mifflin Confined Disposal Facility near Philadelphia, PA. The performance of the spray dryer ash is compared with a blend of LKD and Class F fly ash. Adequate lime alkalinity needs to be added to take advantage of the pozzolanic and sulfo-pozzolanic, cementitious reaction potential. Raising the pH levels to 9-11 for pozzolanic hydration reactivity coincide with pH levels that stabilize leachable heavy metals, including oxyanions. Furthermore, in order to produce structural fill the moisture of the dredge spoil must be reduced as close as possible to the optimum moisture content resulting in compaction at or near maximum dry density. The addition of these by-products will add dry bulk solids and in addition are known to chemically reduce the free moisture through several types of hydration reactions. A “mellowing” period before compaction may help prevent swelling from Ettringite precipitation. Strength measurements with several curing times are presented.
机译：授予大型合同以消除和发现挖泥机的有益用途。一个例子是特拉华河深化项目，该项目涵盖了特拉华河100多英里。挑战之一是找到经济和环保的方法来稳定和固化（S / S）固体，以便将其重新用于结构填充和/或覆盖土壤。这项实验室研究证明了使用三种可与波特兰水泥竞争的可持续工业副产品的方法和结果。它们是石灰窑粉尘（LKD），F级粉煤灰和喷雾干燥机灰（SDA）。 SDA是喷雾干燥器吸收塔的残留物，喷雾吸收塔是使用石灰的一种更常见的高级二氧化硫气体洗涤塔。在中大西洋各州已有喷雾干​​燥器安装，在马萨诸塞州和新泽西州有几套新装置上线。这些喷雾干燥器可以提供廉价的S / S添加剂，并有机会获得二氧化碳信用额。对这些工业副产品进行了研究，以确定它们在稳定和固化来自马里兰州巴尔的摩市Cox Creek封闭处置设施（CDF）的挖泥机固体方面的潜力，目的是制造结构填充材料。另一个实验室研究利用了USCOE Ft的港口疏dr材料。宾夕法尼亚州费城附近的米夫林密闭处置设施。将喷雾干燥器的粉尘与LKD和F级粉煤灰的混合物进行比较。需要添加足够的石灰碱度，以利用火山灰和磺基火山灰胶结反应的潜力。将火山灰水合反应性的pH值提高到9-11与稳定可浸出重金属（包括氧阴离子）的pH值相吻合。此外，为了产生结构填充物，必须将挖泥机的水分尽可能地减少到接近最佳水分含量，从而导致在最大干密度或接近最大干密度时的压实。这些副产物的添加将添加干燥的散装固体，另外已知通过几种类型的水合反应化学减少自由水分。压实之前的“融化”时期可能有助于防止因钙矾石沉淀而膨胀。提出了几种固化时间的强度测量。

著录项

相似文献

  • 外文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号