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Novel composite additive for solidifying material for dredged silt with high water content

A technology for dredging silt and solidifying materials, which is applied in the field of additives, which can solve the problems of large amount of dredging silt design strength and high project cost, and achieve the effects of shortening the construction period, reducing project cost, and reducing treatment costs

Inactive Publication Date: 2011-09-07
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

According to the analysis of existing reports, when the water content is greater than 1.0 times the liquid limit or higher, it is difficult to use the above materials and or additives to make the dredged silt reach the design strength (such as dams and embankments generally require greater than 1.0MPa) or the required The amount of addition is very large, so that the project cost is very high, which limits its application in engineering

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Embodiment 1: each component of the present invention is by following weight percentage

[0027] Cement 7%

[0028] Quicklime 11%

[0029] Sodium polyacrylate 0.1%

[0030] According to this ratio, 1.31 kg of sodium polyacrylate is added to each cubic meter of sludge (initial moisture content 2.0 times the liquid limit), and the 7-day unconfined compressive strength of the cured sludge can reach 500 kPa, and the 28-day unconfined compressive strength can reach 500 kPa. The compressive strength can reach 1000 kPa, which can meet the needs of fast curing. However, using cement and quicklime, with the same mixing ratio, the 7-day strength is only 100 kPa, and the 28-day strength is only 200kPa. To achieve the same curing effect, the amount of cement and quicklime will be greatly increased, and the economic cost will be greatly increased. improve.

Embodiment 2

[0031] Embodiment 2: each component of the present invention is by following weight percentage

[0032] Cement 7%

[0033] Quicklime 15%

[0034] Sodium polyacrylate 0.1%

[0035] According to this ratio, a total of 91.7 kg of cement is added to each cubic meter of sludge (initial moisture content 2.0 times the liquid limit), and the unconfined compressive strength of the solidified sludge can reach 640 kPa in 7 days, and the unconfined compressive strength in 28 days can reach 640 kPa. The compressive strength can reach 1200 kPa, which can meet the needs of fast curing.

Embodiment 3

[0036] Embodiment 3: each component of the present invention is by following weight percentage

[0037] Cement 3%

[0038] Quicklime 7%

[0039] Sodium polyacrylate 0.05%

[0040] According to this ratio, a total of 39.3 kg of cement is added to each cubic meter of sludge (initial moisture content is 2.0 times the liquid limit), and the unconfined compressive strength of the solidified sludge can reach 105 kPa in 7 days, and the unconfined compressive strength can reach 105 kPa in 28 days. The compressive strength can reach 380 kPa, which can meet the needs of fast curing.

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Abstract

The invention aims to solve the problems in the prior art that the river slit is usually dredged by the cutter-suction process, which results in that the initial water content of the soil body is extremely high and generally 2 to 10 times the liquid limit; in the commonly-used solidification process, only quicklime and cement are added to the silt, which results in that the strength of the solidified soil can not meet the design requirements or the addition amount is very large and the manufacturing cost is high. In order to solve the problems, the invention provides a composite additive which is the mixture of dredged silt with high water content, cement, quicklime and sodium polyacrylate. The composite additive can achieve the purpose of rapid solidification of the dredged silt with high water content, and can greatly improve the strength of the soil body. The composite additive comprises the following ingredients in percentage of the total weight of the solidified silt: 3 to 7 percent of cement, 7 to 15 percent of quicklime and 0.05 to 0.1 percent of sodium polyacrylate.

Description

technical field [0001] The invention relates to an additive used for solidification treatment of high water content silt produced in the construction of water conservancy and port waterway projects. The additive can reduce the water content of dredged silt in a large amount and quickly, and greatly improve the early strength and solidification strength. The invention is applicable to the rapid solidification technology of dredging silt with high water content, and belongs to the technical field of water conservancy and port waterway engineering. Background technique [0002] A large amount of silt will be produced in the dredging and widening of river courses and waterways, as well as new port construction and expansion projects in our country. These silts have high moisture content, high clay content, high compressibility, and low strength, so they are difficult to be directly used by projects. Generally, there are two main treatment methods for dredging silt: one is dredgi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/10
Inventor 曹玉鹏洪振舜邓永锋丁建文卞夏
Owner SOUTHEAST UNIV
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