Calcium-magnesium-based composite material for dewatering and curing dredged sludge, and preparation method and application of composite material

A technology for dredging silt and composite materials, applied in infrastructure engineering, construction, soil protection, etc., can solve the problems of unutilization, high processing cost, and single type of proportion, so as to promote early strength improvement, promote water conversion, The effect of accelerating water evaporation

Inactive Publication Date: 2019-09-10
WUHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] There are many types of solidification materials used in sludge solidification disposal, mainly including: lime, cement, steel slag, fly ash and other traditional materials. When dealing with dredging such silt, the effect of water reduction and reinforcement is usually not ideal, and even the amount of curing agent is too large, resulting in high treatment costs
The ratio of the above materials is single, and the advantages of mixing multiple materials and magnesium-based composite materials cannot be used

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] In this embodiment one, the method for preparing the calcium-magnesium-based composite material for dehydration and solidification of dredged silt is as follows:

[0031] Weigh each component according to the proportion: resin SAP 0.5wt.%, cement 6wt.%, dead burnt MgO 8wt.%, magnesium phosphate 13wt.%, metakaolin 8wt.%, active MgO 8wt.%, magnesium chloride 10wt.%. , 3wt.% of quicklime, 3wt.% of sodium silicate, 5.5wt.% of sodium hydroxide, 20wt.% of slag powder, 15wt.% of fly ash; composite material.

[0032] Performance Testing:

[0033]Add 250kg of dehydration-solidified calcium-magnesium-based composite material to each cubic meter of sludge, and set the initial moisture content of the sludge to 120%. After uniform mixing of the sludge and dehydrated-solidified calcium-magnesium-based composite material, prepare a sample with a diameter of 50mm and a height of 100mm , demolded after 3 days of standard curing, and continued curing to 7 days and 28 days, and three pa...

Embodiment 2

[0035] In this embodiment two, the method for preparing the calcium-magnesium-based composite material for dehydration and solidification of dredged silt is as follows:

[0036] Weigh each component according to the proportion: resin SAP 0.5wt.%, cement 6wt.%, dead-burned MgO 8wt.%, magnesium phosphate 13wt.%, metakaolin 8wt.%, active MgO 6wt.%, magnesium chloride 10wt.%. , quicklime 3wt.%, sodium silicate 6wt.%, sodium hydroxide 4.5wt.%, slag powder 20wt.%, fly ash 15wt.%; composite material.

[0037] Performance Testing:

[0038] Add 250kg of dehydration-solidified calcium-magnesium-based composite material to each cubic meter of sludge, and set the initial moisture content of the sludge to 120%. After the sludge and dehydrated-solidified calcium-magnesium-based composite material are evenly stirred, a sample with a diameter of 50 mm and a height of 100 mm is prepared. The mold was removed after 3 days of standard curing, and the curing was continued to 7 days and 28 days....

Embodiment 3

[0040] In this embodiment three, the method for preparing the calcium-magnesium-based composite material for dehydration and solidification of dredged silt is as follows:

[0041] Weigh each component according to the proportion: resin SAP 0.5wt.%, cement 6wt.%, dead-burned MgO 10.5wt.%, magnesium phosphate 15wt.%, metakaolin 8wt.%, active MgO 8wt.%, magnesium chloride 12wt. %, quicklime 2wt.%, sodium silicate 3wt.%, sodium hydroxide 3wt.%, slag powder 20wt.%, fly ash 12wt.%; then mix and mix evenly to get dredged silt dehydration solidified calcium magnesium base composite material.

[0042] Performance Testing:

[0043] Add 250kg of dehydration-solidified calcium-magnesium-based composite material to each cubic meter of sludge, and set the initial moisture content of the sludge to 120%. After the sludge and dehydrated-solidified calcium-magnesium-based composite material are evenly stirred, a sample with a diameter of 50 mm and a height of 100 mm is prepared. The mold was ...

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Abstract

The invention provides a calcium-magnesium-based composite material for dewatering and curing dredged sludge, and a preparation method and application of the composite material, and can effectively solve the problems that dredged sludge is high in water content, low in bearing capacity, low in compression resistance and shear strength, and the like, and the sludge has good physical and mechanicalproperties after treatment. The calcium-magnesium-based composite material for dewatering and curing dredged sludge comprises the following components based on dry powder: 0.25-1 wt% of a resin superabsorbent polymer (SAP), 6-12 wt% of cement, 6-15 wt% of dead burned MgO, 8-22 wt% of magnesium phosphate, 6-18 wt% of metakaolin, 6-15 wt% of active MgO, 10-25 wt% of magnesium chloride, 2-4 wt% of quicklime, 3-8 wt% of sodium silicate, 3-6 wt% of sodium hydroxide, 15-40 wt% of slag powder and 10-30 wt% of fly ash.

Description

technical field [0001] The invention belongs to the field of building materials, and in particular relates to a calcium-magnesium-based composite material for dehydration and solidification of dredged silt, a preparation method and application thereof. [0002] technical background [0003] During the dredging and dredging process of inland lakes, port roadways and river sediments in my country, a large amount of dredged silt with high water content (even as high as 200-300%) and a certain risk of polluting the surrounding environment will inevitably be produced. These silts usually have high clay content, high moisture content, low shear strength, poor bearing capacity, and emit a foul smell. They do not need to be stacked for a long time, not only occupying a large amount of cultivated land, polluting the land environment, but also difficult to be directly used as engineering fillers. Therefore, the problem of co-processing of dredged silt dehydration and solidification is ...

Claims

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Application Information

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IPC IPC(8): C04B28/34E02D3/00E02D3/12
CPCC04B28/344C04B2111/00732C04B2201/50E02D3/00E02D3/12C04B24/2641C04B7/02C04B22/066C04B14/106C04B22/12C04B22/064C04B12/04C04B22/062C04B18/141C04B18/08
Inventor 王东星
Owner WUHAN UNIV
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