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River sediment solidifying method implemented based on liquid limit indexes

A technology of river sediment and solidification method, applied in chemical instruments and methods, fixed/solidified sludge treatment, polluted waterway/lake/pond/river treatment, etc. The effect of reducing waste, saving construction period and reducing the number of tests

Inactive Publication Date: 2018-12-25
FUZHOU UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is currently no uniform standard for suitable curing agents for different types of river sediments. When curing is required in engineering, it is necessary to conduct proportioning tests of different curing agents and dosages, and to measure the engineering properties of the cured soil after curing, which will delay the construction period. , causing a waste of resources

Method used

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  • River sediment solidifying method implemented based on liquid limit indexes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] In a river channel treatment project in a certain city, the sediment liquid limit was 44.03%, the organic matter content determined by the loss on ignition method was 3.67%, and potassium dichromate was used as an oxidant to measure the COD content of the river water by the colorimetric method to be 84mg / L. When the water content is 39.43%, measure the density of the bottom mud at this time, and use 50kg, 75kg, and 100kg of cement as the curing agent per m³ of bottom soil. After stirring for 3 minutes at a low speed of 62 rpm and 5 minutes at a high speed of 125 rpm with a cement slurry mixer, fill the solidified soil into a semi-open cylindrical plexiglass mold with a diameter of 3.91 cm and a height of 8 cm, and fully vibrate the solidified soil. Mesopores are minimized. Seal it with a sealed bag and put it in a curing box at 20±2°C and humidity greater than 95% for curing. After the solidified soil is molded within 1 to 3 days, it should be demoulded and wrapped wit...

Embodiment 2

[0024] In a river system improvement project in a certain city, the sediment liquid limit was 38.45%, the organic matter content determined by the loss on ignition method was 3.98%, and the COD content of the river water measured by the colorimetric method using potassium dichromate as an oxidant was 164mg / L. When the water content is 57.68%, measure the density of the bottom mud at this time, use 100kg cement and 100kg cement respectively add 10kg, 20kg, 30kg phosphogypsum as curing agent per m³. The manufacturing process, the curing method and the determination of the curing index are all the same as in Example 1.

[0025] The results show that the amount of curing agent is 100kg / m 3 At the age of 28 days, it still does not meet the strength required for landfill; the amount of curing agent is 110kg / m 3 , the 7-day age strength can reach 137kPa; the curing agent dosage is 120kg / m 3 When the age of 7 days can reach 82kPa; the amount of curing agent is 130kg / m 3 , the 7-day...

Embodiment 3

[0027] In a river system improvement project in a city, the sediment liquid limit was 44.03%, the organic matter content determined by the loss on ignition method was 3.67%, and the COD content of the river water measured by the colorimetric method was 84mg / L with potassium dichromate as the oxidant. When the water content is 66.05%, measure the density of the bottom mud at this time, use 100kg cement and 100kg cement respectively add 10kg, 20kg, 30kg phosphogypsum as curing agent per m³. The manufacturing process, the curing method and the determination of the curing index are all the same as in Example 1.

[0028] The results show that the amount of curing agent is 100kg / m 3 At the age of 28 days, it still does not meet the strength required for landfill; the amount of curing agent is 110kg / m 3 , the 7-day age strength can reach 50kPa, which does not meet the landfill requirements, and the 28-day age strength is 316kPa; the curing agent dosage is 120kg / m 3 When the age of ...

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Abstract

The invention discloses a river sediment solidifying method implemented based on liquid limit indexes. A liquid limit value of river sediment is used as a main index in combination with sediment watercontent, organics content, and pore liquid COD content; cement and phosphogypsum are mixed in a weight ratio of 1:(0-0.4) into a solidifying agent for solidifying urban river sediment, and therefore,the river sediment can meet the requirements of common filling construction. The specific ratio and doping quantity of the solidifying agent are given for river sediment with the liquid limit of 120%and below, organics content of 11% and below, and pore liquid COD content of 1500 mg / L and below; quick solidification can be carried out for different types of river sediment; construction period can be shortened, and resources can be saved.

Description

technical field [0001] The invention belongs to the technical field of civil engineering, and in particular relates to a method for solidifying river bottom mud based on a liquid limit index. Background technique [0002] The dredging and dredging of rivers and waterways plays a key role in the construction of infrastructure. With the vigorous development of ecological civilization construction in China, the implementation of the river chief system, the implementation of the "Ten Water" governance action, and focus on the governance of black and smelly rivers , More and more projects related to river dredging, lake management, and ocean dredging are launched in various counties and cities in China. [0003] Due to its high water content and low strength, the dredged sediment of urban rivers is usually in a flowing state, and often contains complex pollutants. It has become a typical waste with a large amount and high difficulty in treatment. By adding a curing agent, the ri...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F101/30
CPCC02F11/008C02F2303/06C02F2101/30C02F2103/007
Inventor 曾玲玲谢铭王钢
Owner FUZHOU UNIVERSITY
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