A kind of marine silt composite curing agent

A composite curing agent and silt technology, applied in the engineering field, can solve the problems of high energy consumption and large cement consumption, and achieve the effects of reducing water content, good water absorption, and solving large cement consumption.

Active Publication Date: 2021-07-06
DALIAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a marine mud composite curing agent that is economical, has superior performance, and effectively utilizes waste, so as to solve the problems of large cement consumption, high energy consumption, and emission of toxic and harmful gases

Method used

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  • A kind of marine silt composite curing agent
  • A kind of marine silt composite curing agent
  • A kind of marine silt composite curing agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A marine silt solidifying agent, its raw materials include: 8% cement, 5% silica fume, 10% plant ash, and 1.0% NaOH in terms of mass fraction. Mix the weighed cement, silica fume, plant ash and dry soil evenly, then pour the weighed NaOH into the pre-weighed water and stir until it does not generate heat, then fully mix the solution with the previous dry soil mixture, Make 3 parallel samples and put them into a mold with a diameter of 3.91cm and a height of 8cm, and place them in a curing room with a temperature of (20±2)°C and a humidity greater than 90% for standard curing for 24 hours, then demould. Continue curing until 7 days and 28 days to measure its unconfined compressive strength. The measured intensities are shown in Table 1.

[0022] Table 17-day and 28-day strength tables

[0023]

Embodiment 2

[0025] A marine silt solidifying agent, its raw materials include: 10% cement, 7.5% silica fume, 15% plant ash, and 1.0% NaOH in terms of mass fraction. Mix the weighed cement, silica fume, plant ash and dry soil evenly, then pour the weighed NaOH into the pre-weighed water and stir until it does not generate heat, then fully mix the solution with the previous dry soil mixture, Make 3 parallel samples and put them into a mold with a diameter of 3.91cm and a height of 8cm, and place them in a curing room with a temperature of (20±2)°C and a humidity greater than 90% for standard curing for 24 hours, then demould. Continue curing until 7 days and 28 days to measure its unconfined compressive strength. The measured intensities are shown in Table 2.

[0026] Table 27-day and 28-day strength tables

[0027]

Embodiment 3

[0029] A marine sludge solidifying agent, its raw materials include: 12% cement, 10% silica fume, 15% plant ash, and NaOH: 0.5%. Mix the weighed cement, silica fume, plant ash and dry soil evenly, then pour the weighed NaOH into the pre-weighed water and stir until it does not generate heat, then fully mix the solution with the previous dry soil mixture, Make 3 parallel samples and put them into a mold with a diameter of 3.91cm and a height of 8cm, and place them in a curing room with a temperature of (20±2)°C and a humidity greater than 90% for standard curing for 24 hours, then demould. Continue curing until 7 days and 28 days to measure its unconfined compressive strength. The measured intensities are shown in Table 3.

[0030] Table 37-day and 28-day strength tables

[0031]

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Abstract

The invention belongs to the technical field of engineering, and in particular relates to a composite curing agent for marine silt. The composite curing agent for marine silt is composed of the following raw materials in terms of mass fraction, and the mass percentages of each raw material component in marine silt are respectively: Cement 8%‑15%, silica fume 5%‑10%, plant ash 10%‑20%, NaOH: 0.5%‑1.5%. The present invention reduces the water content of marine sludge more effectively by utilizing the characteristics of good water absorption of waste silica fume and plant ash; and the aqueous solution of plant ash is alkaline, which can increase the pH value of solidified sludge together with NaOH, making it more efficient It is conducive to the reaction; through a series of physical and chemical reactions to achieve the best curing effect. It can solve the problems of large cement consumption, high energy consumption, and high emission of toxic and harmful gases, and can achieve the goals of resource conservation and waste utilization.

Description

technical field [0001] The invention belongs to the technical field of engineering, and in particular relates to a composite solidifying agent for marine mud. Background technique [0002] Every year, a large amount of silt is produced due to dredging projects in oceans, lakes and rivers. These silts were previously dumped directly into the ocean or piled up in the open space. Some even contain heavy metal ions, which will pollute marine waters and occupy a large amount of land resources. Moreover, this kind of silt has the characteristics of high natural water content, high salt content, high compressibility, low permeability, low strength and large porosity, and it has large settlement, low bearing capacity and poor stability during normal construction, so it cannot be directly used in engineering. The sludge solidification technology is to process the discarded sludge into usable geotechnical materials or building materials through chemical or physical methods for recycl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B28/04C02F11/00
CPCC02F11/008C04B28/04C04B2111/00784C04B18/146C04B22/062C04B22/0006C04B22/10
Inventor 独传鑫杨庆杨钢
Owner DALIAN UNIV OF TECH
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