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Cement Deep Soil Mixing (CDSM) for Solidification of Soft Estuarine Sediments

机译：水泥深层搅拌法（CDSM）固化软河口沉积物

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摘要

A preliminary study was conducted to determine the potential for cement deep soil mixing (CDSM) technology as a method for in-situ solidification of contaminated river and estuarine sediments. The study was conducted in Newark Bay, near the mouth of the Passaic River, New Jersey. The primary objective of the study was to evaluate the viability of CDSM for the in-situ S/S with a focus on: 1) determining the correct mix of the cement slurry, which provides rapid stabilization of the sediment matrix, 2) potential resuspension of solids during CSDM operations, 3) the effects of high organic content on the solidification process, and 4) the feasibility of using conventional dredging/extraction methods once the sediments have been stabilized and allowed to cure. The results of the study show CDSM slurry mixtures, as low as 7 percent in cement content, result in significant solidification and strength gain of in-situ sediments under ambient conditions. In sediments with very high organic contents (>20 percent), the slurry mix would need to be adjusted to account for retardation effects of organics on cement hydration. Sediment resuspension during application was shown to be minimal at a distance of as little as 75 feet from the mixing head Strength gains were considerable, effectively consolidating the sediment
机译：进行了一项初步研究，以确定水泥深层土拌和技术（CDSM）作为被污染的河流和河口沉积物原位固化的方法的潜力。该研究是在新泽西州帕萨克河口附近的纽瓦克湾进行的。这项研究的主要目的是评估CDSM在现场S / S上的可行性，重点在于：1）确定水泥浆的正确混合物，从而可以快速稳定沉积物基质，2）潜在的重悬浮CSDM操作过程中产生的固体; 3）高有机含量对固化过程的影响，以及4）一旦沉积物稳定并固化，便可以使用传统的挖泥/萃取方法。研究结果表明，CDSM泥浆混合物的水泥含量低至7％，可在环境条件下显着固化并提高原位沉积物的强度。在有机物含量很高（> 20％）的沉积物中，需要调整泥浆混合物以解决有机物对水泥水化的延迟作用。在施工过程中，与混合头的距离仅为75英尺，沉积物的重悬作用极小。强度增益相当大，有效地巩固了沉积物

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