Phosphogypsum stabilized collapsible loess roadbed material and preparation method thereof

A technology for collapsible loess and roadbed materials, which is applied in the field of phosphogypsum-stabilized collapsible loess roadbed materials and its preparation, can solve the problems of insufficient utilization rate, occupation of land resources, pollution of the environment, etc., and achieve reasonable formula, simple preparation method, The effect of large social and economic benefits

Inactive Publication Date: 2018-09-18
CHANGAN UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiencies in the prior art, the object of the present invention is to provide a phosphogypsum stable collapsible loess roadbed material and a preparation method, which can improve the utilization rate of phosphogypsum on the basis of overcoming the engineering problems of the collapsible loess roadbed. Solve the problems of continuous expansion of phosphogypsum stockpile, insufficient utilization rate, occupation of land resources, and serious environmental pollution

Method used

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  • Phosphogypsum stabilized collapsible loess roadbed material and preparation method thereof
  • Phosphogypsum stabilized collapsible loess roadbed material and preparation method thereof

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preparation example Construction

[0025] A preparation method of phosphogypsum stabilized collapsible loess roadbed material, comprising the following steps:

[0026] Step 1), crushing phosphogypsum, slaked lime, and collapsible loess into granules for subsequent use;

[0027] Step 2), get phosphogypsum, fly ash, slaked lime, collapsible loess according to mass percentage according to 6~11%: 12~22%: 6~11%: 56~76%, with phosphogypsum, fly ash and Slaked lime was stirred evenly under normal temperature conditions to obtain product A;

[0028] Step 3), then the collapsible loess and product A are stirred evenly under normal temperature conditions to obtain product B;

[0029] Step 4), the product B and water are fully stirred according to the mass ratio of 1: (0.195-0.276) under normal temperature conditions, and the product C is obtained, that is, the finished product of phosphogypsum stabilized collapsible loess roadbed material.

[0030] In step 1), the particle size of phosphogypsum and collapsible loess is...

Embodiment 1

[0032] Step 1), breaking phosphogypsum, slaked lime, and collapsible loess into granules, wherein: the particle diameter of phosphogypsum and collapsible loess is 4.75mm, and the particle diameter of slaked lime is 2.36mm;

[0033] Step 2), take 6% of phosphogypsum, 12% of fly ash, 6% of slaked lime, and 76% of collapsible loess according to the mass percentage, and mix phosphogypsum, fly ash and slaked lime evenly under normal temperature conditions to obtain product A;

[0034] Step 3), then the collapsible loess and product A are stirred evenly under normal temperature conditions to obtain product B;

[0035] Step 4), the product B and water are mixed at a ratio of 1:0.195 at room temperature, and the product C is obtained, that is, the finished phosphogypsum stable collapsible loess roadbed material is obtained.

[0036] The phosphogypsum stabilized collapsible loess subgrade material obtained through the above steps was formed into a test piece with the maximum compactnes...

Embodiment 2

[0038] Step 1), breaking phosphogypsum, slaked lime, and collapsible loess into granules, wherein: the particle diameter of phosphogypsum and collapsible loess is 4.75mm, and the particle diameter of slaked lime is 2.36mm;

[0039] Step 2), take 8% of phosphogypsum, 16% of fly ash, 8% of slaked lime and 68% of collapsible loess according to the mass percentage, and mix phosphogypsum, fly ash and slaked lime evenly at normal temperature to obtain product A;

[0040]Step 3), then the collapsible loess and product A are stirred evenly under normal temperature conditions to obtain product B;

[0041] Step 4), mix the product B and water according to the ratio of 0.219 to 1:0.210 at room temperature to obtain the product C, which is the finished product of phosphogypsum stable collapsible loess roadbed material.

[0042] The phosphogypsum stabilized collapsible loess subgrade material obtained through the above steps was formed into a test piece with the maximum compactness, and th...

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Abstract

The invention discloses a phosphogypsum stabilized collapsible loess roadbed material and a preparation method thereof. According to the method disclosed by the invention, phosphogypsum is added intoa mixture composed of fly ash, slaked lime and collapsible loess, through addition of the phosphogypsum, main component calcium sulfate contained in the phosphogypsum can activate activity of the inert material fly ash and accelerate a pozzolanic reaction between lime and the fly ash, and needle-shaped ettringite is generated, so that the method has the effect of further enhancing strength of limeand fly ash stabilized collapsible loess, and the loess has higher strength and rigidity and excellent road performance; Ga<2+> contained in the slaked lime and active SiO2 and Al2O3 contained in thefly ash and the collapsible loess act to form water-containing calcium silicate and calcium aluminate, and the water-containing calcium silicate and calcium aluminate are a basis of formation of thelime and fly ash stabilized collapsible loess; and the roadbed material disclosed by the invention has a reasonable formula and the simple preparation method, and the finished product has better strength, rigidity and good road performance, and is suitable for construction of highways in collapsible loess areas.

Description

technical field [0001] The invention relates to a phosphogypsum stable collapsible loess roadbed material and a preparation method thereof, belonging to the field of highway roadbed materials. Background technique [0002] The collapsible loess soil is loose and has a typical pore structure. If it is used as a subgrade without treatment, the strength will decrease rapidly under the action of precipitation, which will cause sudden collapse of the collapsible loess subgrade and the overall collapse of the soil slope. Project quality problems, which in turn lead to secondary road diseases such as large-area cracks and subsidence on the road surface. In view of the many problems existing in the collapsible loess subgrade itself, certain technical measures must be taken to deal with it, so that it has a certain strength and bearing capacity, so as to ensure the stability and quality of the subgrade. [0003] Phosphogypsum is an industrial by-product of the wet process production...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14
CPCC04B28/143C04B2111/00017C04B2111/00732C04B2111/0075C04B2201/50C04B18/08C04B22/064C04B14/10C04B22/066C04B20/0076
Inventor 彭波尹志全唐娴李文瑛赵宏伟董林劭宋云峰徐世俊殷世林任自铭杜冰洁于洪兴吴琰任新涛吴世园杨征文童晓莹何娟欧阳威华赵林渭
Owner CHANGAN UNIV
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