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Soil curing agent doped with sludge incineration ash and preparation method thereof

A soil solidifying agent and sludge incineration technology, applied in the field of solidifying agents, can solve problems such as serious greenhouse effect, and achieve the effect of reducing carbon dioxide emissions and saving costs.

Pending Publication Date: 2021-07-23
SHANGHAI RES INST OF BUILDING SCI CO LTD +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the cement production process requires high-temperature calcination and releases a large amount of carbon dioxide. According to calculations, about 597kg of carbon dioxide will be produced for each ton of cement produced. Excessive carbon dioxide emissions will lead to global warming and the greenhouse effect is serious

Method used

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  • Soil curing agent doped with sludge incineration ash and preparation method thereof
  • Soil curing agent doped with sludge incineration ash and preparation method thereof
  • Soil curing agent doped with sludge incineration ash and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Use PO42.5 cement, S95 slag powder, industrial by-product gypsum and sludge incineration ash as raw materials, and make ingredients according to Table 1. Among them, industrial by-product gypsum includes sintered dry desulfurization ash, phosphogypsum and titanium gypsum. The ratio of by-product gypsum converted to dry basis.

[0036] In this embodiment, a solidifying agent is used to reinforce the silt soil. The dosage of the curing agent is 12%, and the water-binder ratio (that is, the percentage of water in the total amount of the curing agent and the silt soil) is 0.5.

[0037] The 7d unconfined compressive strength and 28d unconfined compressive strength were tested according to the unconfined compressive strength test method of B.2 in JGJ / T 233-2011; the test results are as follows:

[0038]Table 1: Test mix ratio (%) and soil unconfined compressive strength of solidifying agent reinforced soil mixed with sludge incineration ash

[0039]

[0040]

[0041] T...

Embodiment 2

[0047] In this embodiment, the soil solidifying agent mixed with sludge incineration ash is used to strengthen the soft foundation, and the specific steps are as follows:

[0048] (1) Sludge incineration ash is first pretreated by ball milling, followed by 45 μm negative pressure sieve analysis method in GB / T 1345. The sieve analysis time is 3 minutes, and the fineness of sludge incineration ash is 11.2%.

[0049] Among them, the specific steps of the negative pressure sieve analysis method in GB / T 1345 include: before the sieve analysis test, a 45 μm negative pressure sieve should be placed on the sieve seat, the sieve cover should be covered, the power supply should be connected, the control system should be checked, and the negative pressure should be adjusted to Within the range of 4000Pa~6000Pa; Weigh the sample to an accuracy of 0.01g, place it in a clean negative pressure sieve, put it on the sieve seat, cover the sieve cover, turn on the power, start the sieve analyzer ...

Embodiment 3

[0067] In this embodiment, the solidifying agent mixed with sludge incineration ash is used instead of cement to strengthen the soil roadbed, and the specific steps are as follows:

[0068] (1) According to the 45μm negative pressure sieve analysis method in GB / T 1345, the sieve analysis time is 3min, and the fineness of the obtained sludge incineration ash is 30.2%. After testing, its heavy metal leaching concentration, dioxin and other safety The indicators are qualified;

[0069] (2) The selected industrial by-product gypsum is a by-product of phosphate fertilizer production, i.e. titanium gypsum, with a water content of 1.2%. After testing, the pH of titanium gypsum is 3, and adding 0.5% hydrated lime as a modifier to adjust the pH is 6~ 11.

[0070] (3) Weigh the sludge incineration ash, industrial by-product gypsum, slag powder and cement according to the mass percentage, and mix them to obtain a soil solidifying agent mixed with the sludge incineration ash.

[0071] (...

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Abstract

The invention provides a soil curing agent doped with sludge incineration ash. The soil curing agent is prepared from the following materials in parts by weight: 0-30% of sludge incineration ash, 5-10% of gypsum, 40-55% of slag powder and 20-30% of cement; when the curing agent is used for reinforcing a high-soft soil foundation, the dosage ratio of the curing agent to soft soil is 10%-30%; when the curing agent is used for roadbed reinforcement, the dosage ratio of the curing agent to soil is 4-15%. According to the soil curing agent doped with the sludge incineration ash, multiple solid wastes are synergistically matched, chlorine salt and sulfate components in the sludge incineration ash serve as exciting agents, strength is provided for the soil body, the curing agent is an environment-friendly curing agent integrating multiple solid wastes, and on the premise that the same curing effect as cement is achieved, the cost is lower than cement; besides, development of the soil curing agent finds a way for disposal and utilization of sludge incineration ash, and meanwhile, various solid wastes can be consumed, so that resource and energy conservation and waste utilization and new material development are realized.

Description

technical field [0001] The invention relates to the technical field of curing agents, in particular to a soil curing agent mixed with sludge incineration ash and a preparation method thereof. Background technique [0002] Stirring pile technology (wet method, dry method) is a common method for strengthening soft ground before foundation pit excavation in underground engineering. Usually, deep mixing method, high-pressure jet grouting method and other construction techniques are used to spray curing agent to make curing agent and soft soil The soil reacts to form a temporary mixing pile retaining wall with high strength. At present, cement is the main curing agent for mixing piles used in most projects. Due to its high strength and stable performance, cement has become one of the most important soft soil foundation treatment technologies in my country. However, the cement production process requires high-temperature calcination and releases a large amount of carbon dioxide. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/142C04B28/143C04B28/144C04B2111/00017C04B2201/50
Inventor 王琼李阳杨利香陆美荣
Owner SHANGHAI RES INST OF BUILDING SCI CO LTD
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