CN104909698B - A kind of modified ardealite roadbed stuffing for expressway and preparation method thereof - Google Patents
A kind of modified ardealite roadbed stuffing for expressway and preparation method thereof Download PDFInfo
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- CN104909698B CN104909698B CN201510314184.3A CN201510314184A CN104909698B CN 104909698 B CN104909698 B CN 104909698B CN 201510314184 A CN201510314184 A CN 201510314184A CN 104909698 B CN104909698 B CN 104909698B
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Abstract
The invention discloses a kind of modified ardealite roadbed stuffing for expressway and preparation method, described method comprises the steps: ardealite is aged more than 5d, obtains material A；Material A is calcined 1.5 2.5 hours at 160 200 DEG C and obtains material B, then described material B is cooled down naturally；Described material A and material B are mixed according to the weight percent proportioning of 91%～93%:7%～9%, obtains material C；In described material C, add the water accounting for material C gross mass 12 16%, after stirring, obtain modified ardealite roadbed stuffing for expressway.The present invention is according to the chemical characteristic of calcined phosphogypsum, carry out ardealite under controlled temperature and time calcining as modifying agent, improve the gelling in ardealite body, increase stability and the water-resistance of its internal structure, obtaining and meet the roadbed filling that highway engineering requires, effectively the existing ardealite of solution is limited by local admixture material and ardealite uses the problem that consumption is low.
Description
Technical field
The invention belongs to road foundation field of material preparation, fill out more particularly, to a kind of modified ardealite highway subgrade
Material and preparation method thereof.
Background technology
The current application to industrial waste ardealite, mainly has following several: prepare the gypsum as construction material, preparation
Producing sulfuric acid and jointly cement, produce low alkaline sulphate aluminium cement, as the modifying agent of basic soil, for producing potassium sulfate and work
Property calcium silicates etc..
Ardealite is applied to highway construction, is the effective way solving problem of environmental pollution, can reduce again scarce soil district
Highway investment, prepare the existing many patents of material about ardealite as highway, such as application publication number CN103771820A,
The patent document in May 7 2014 Shen Qing Publication day discloses a kind of fresh half water ardealite two mud pavement base course material, this material
Material raw material per distribution ratio by weight consists of: fresh half water ardealite 20～85%, quick lime 3～10%, red flyash or
Brown flyash 10～75%；Application publication number CN102491721A, the patent document in June 13 2012 Shen Qing Publication day is public
Having opened a kind of ardealite road base course material and preparation method thereof, it is made with the raw material of following weight proportioning: ardealite
40～80 parts, diethyl amino propylamine 0.5～5 parts, polycarboxylate water-reducer 0.1～0.5 part, sandstone 10～40 parts, water granulated slag 5～
40 parts, preparation method is: is dehydrated by ardealite, crushes；Ardealite, sandstone, Water Quenching Slag are mixed, obtains material A；By poly-carboxylic
Acid water reducer mixes with material A, obtains material B；Diethyl amino propylamine is added in material B and mix, obtain material C；To
Material C adds water, is uniformly mixing to obtain finished product；Authorization Notice No. CN102815915B, authorized announcement date on May 7th, 2014
Patent document discloses a kind of highway modified ardealite stabilized zone material and preparation method thereof, and its composition mainly comprises ratio
For: ardealite 30%～50%, modifying agent 10%～30%, sandstone 30%～60%, water 5%～50%.
But, the preparation method of above-mentioned road foundation material there is problems in that on the one hand subgrade engineering is by its thickness
Limit, be unfavorable for using consumption ardealite in a large number；On the other hand, it is required for during preparation filling other material beyond dephosphorization gypsum
Material, such as quick lime, flyash, diethyl amino propylamine, sandstone, water granulated slag etc., adds other special admixture material, limits scarce
The application of the ardealite of this admixture material region few.
Summary of the invention
For disadvantages described above or the Improvement requirement of prior art, the invention provides a kind of modified ardealite highway subgrade and fill out
Material and preparation method thereof, wherein combines the feature of ardealite self, ardealite carries out under controlled temperature and time calcining and makees
For modifying agent, ardealite to be modified stable process, obtain modified ardealite, thus meet highway engineering subgrade filler
Requirement, can effectively solve existing ardealite accordingly and be limited by local admixture material and ardealite use low the asking of consumption
Topic, additionally, calcine technology such as calcining heat, calcination time and calcined phosphogypsum are also joined by the present invention with ageing ardealite
The technological parameters such as the addition than, water are studied and have been designed, and can obtain high stability, high waterproof and durability accordingly
Roadbed filling.
For achieving the above object, according to one aspect of the present invention, it is proposed that a kind of modified ardealite roadbed stuffing for expressway
Preparation method, it is characterised in that comprise the steps:
(1) ardealite is aged 5d material A derived above；
(2) part for the material A obtained by selecting step (1), and it is calcined at 160-200 DEG C 1.5-2.5
Hour obtain material B, then described material B is cooled down naturally；
(3) by described material A and naturally cool down after material B according to 91%～93%:7%～9% percentage by weight
Mix, obtain material C；
(4) in the described material C obtained by step (3), add the water of the 12-16% accounting for described material C gross weight,
Modified ardealite roadbed stuffing for expressway is obtained after stirring.
It is further preferred that for step (2), calcining heat more preferably 170-190 DEG C, calcination time enters
One step is preferably 1.8-2.0 hour.
It is further preferred that for step (3), the proportioning of described material A and material B more preferably 92%:
8%.
It is further preferred that for step (4), the addition of water more preferably accounts for described material C gross weight
14.5%.
According to another aspect of the present invention, it is proposed that a kind of use modified ardealite roadbed stuffing for expressway to prepare roadbed
Method, it is characterised in that comprise the steps:
(1) ardealite is aged 5d material A derived above；
(2) part for the material A obtained by selecting step (1), and it is calcined at 160-200 DEG C 1.5-2.5
Hour obtain material B, then described material B is cooled down naturally；
(3) by described material A and naturally cool down after material B according to 91%～93%:7%～9% percentage by weight
Mix, obtain material C；
(4) in the described material C obtained by step (3), add the water of the 12-16% accounting for described material C gross weight,
Modified ardealite roadbed stuffing for expressway is obtained after stirring；
(5) the described modified ardealite roadbed stuffing for expressway obtained by step (4) is paved, use road roller pair
Described modified ardealite roadbed stuffing for expressway is compacted, until natural Health preservation after its compactness >=96%, in this way, it is thus achieved that
High stability and the roadbed of high waterproof.
According to another aspect of the present invention, it is proposed that a kind of modified ardealite roadbed stuffing for expressway, it is characterised in that should
Roadbed filling is mixed jointly by material A, material B and water, and wherein material A is the ardealite of ageing more than 5d, and material B is
The calcined phosphogypsum ardealite of ageing more than 5d calcined 1.5-2.5 hour at 160-200 DEG C and obtain, and material A
And being 91%～93%:7%～9% to prepare according to weight ratio between material B, described water then accounts for material A and material B gross weight
The 12-16% of amount.
In general, by the contemplated above technical scheme of the present invention compared with prior art, mainly possess following
Technological merit:
1. the present invention is in order to reach to use in a large number the target of ardealite, in the case of conventional improved effect is unconspicuous, and root
According to the chemical characteristic of calcined phosphogypsum, using calcined phosphogypsum as the exciting agent of improvement ardealite, under the conditions of certain compacting, carry
The high intensity of ardealite waste material, water stability, its expansion rate is less than highway engineering weak expansive soil index, the ardealite that modification obtains
Meet highway engineering subgrade filler requirement, can realize being applicable on a large scale.
The most especially, by key condition prepared by roadbed filling in the present invention, such as calcining heat, the calcining of ardealite
Time, ageing ardealite and the proportioning of calcined phosphogypsum and water content are studied and have been designed, it is thus achieved that most suitable parameter
Value, research shows, when calcining heat be 160-200 DEG C, calcination time be that 1.5-2.5 is little constantly, half water ardealite energy of generation
Enough improve the physical property of ardealite, can further improve the overall water stability of ardealite roadbed filling, durability；Ageing phosphorus stone
When the proportioning of cream and calcined phosphogypsum is 91%～93%:7%～9% so that roadbed has optimal durability；Water content is
During the 12-16% of material A and material B gross weight so that after the half water ardealite obtained after calcining and ageing ardealite aquation,
Can mutual compact siro spinning technology, the further stability of raising roadbed between gypsum crystal grain.
3., according to the calcined phosphogypsum modified ardealite of the present invention as roadbed filling, outside raw material dephosphorization gypsum, it is not required to
Add other materials, overcome the defect that existing ardealite is limited by local addition material in highway engineering, simultaneously as
The material usage of roadbed filling is more than base material, and therefore, this method can consume ardealite waste material in a large number, solves ardealite scrap heap
, use the little problem of consumption.
Accompanying drawing explanation
Fig. 1 is the SEM electron-microscope scanning figure of 100% pure ardealite test block；
Fig. 2 is the SEM electron-microscope scanning figure of 7% calcined phosphogypsum+93% ardealite test block.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with drawings and Examples, right
The present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, and
It is not used in the restriction present invention.If additionally, technical characteristic involved in each embodiment of invention described below
The conflict of not constituting each other just can be mutually combined.
Calcined phosphogypsum main component is semi-hydrated gypsum, has good gelling, after it mixes chance water with ardealite, and half
Water gypsum partially changes into dihydrate gypsum, owing to the solubility of dihydrate gypsum crystal is less than the solubility of semi-hydrated gypsum, causes part
Dihydrate gypsum separates out with crystal in slurry, along with the dissolving of semi-hydrated gypsum and the continuous of dihydrate gypsum separate out, calcined phosphogypsum+
Moisture in ardealite constantly reduces, and the mobility of compound gypsum body weakens, and final curing is the hardenite having some strength,
The water stability of ardealite, durability can be improved with this, therefore, by calcined phosphogypsum, its solvent dihydrate gypsum be become
Semi-hydrated gypsum, namely the change of its gel characteristic is strong so that it is there is more preferable anti-folding and compression strength.The chemical equation of dihydrate gypsum
For:
Dihydrate gypsum starts to slough the crystallization water at 108 DEG C, has a fast endothermic process at about 159 DEG C, and this is two water
Gypsum loses 1.5H2The process of O, then forms shorter metastable process, the most beneficially a formation for semi-hydrated gypsum,
Have one one-level between 172-178 DEG C is thermal spike, and this is the process that semi-hydrated gypsum changes to soluble anhydrite,
After 260 DEG C, anhydrous gypsum tends towards stability, and the research through the present invention finds when the calcining heat of calcined phosphogypsum controls
Between 160-200 DEG C, it is more beneficial for the generation of semi-hydrated gypsum.For the selection of calcination time, upon calcination between shorter time two water
Gypsum is the most sufficiently converted, upon calcination between more than 2.5h time, have part dihydrate gypsum to be converted into anhydrite, reduce
The intensity of calcined phosphogypsum, considers above-mentioned factor, calcination time select 1.5-2.5 hour the most suitable.Fig. 1 is 100% pure phosphorus
The SEM electron-microscope scanning figure of gypsum test block, it can be seen that the dihydrate gypsum crystal in ardealite is thick, how plate-shaped, water chestnut
Shape, test block do not soaks water, and its crystal grain is cotton-shaped, the hyrate weave in of sheet, but the most closely knit closely.Fig. 2 is 7%
Calcined phosphogypsum+93% ardealite is the SEM electron-microscope scanning of test block after maintenance in 3 days (20 ± 2 DEG C, humidity 98%) is soaked and dried
Figure, it can be seen that owing to ardealite is that light material maintains higher mechanical strength simultaneously, half water phosphorus after calcining
After gypsum and ardealite aquation, being connected with each other between gypsum crystal grain, the connection in gypsum crystal grain is mainly bar-shaped or block connection,
And compact siro spinning technology between crystal.
It is the preferred embodiments of the present invention below:
Embodiment 1:
The preparation method of a kind of modified ardealite roadbed stuffing for expressway, comprises the steps:
(1) ardealite is aged 5d material A derived above；
(2) part of material A obtained by selecting step (1), and it is calcined 2.5 hours at 160 DEG C obtain
Material B, then cools down naturally by described material B；
(3) described material A and material B are mixed according to the percentage by weight of 91%:9%, obtain material C；
(4) in the described material C obtained by step (3), add the water of account for described material C gross weight 16%, stirring
Modified ardealite roadbed stuffing for expressway is obtained after uniformly.
Embodiment 2:
The preparation method of a kind of modified ardealite roadbed stuffing for expressway, comprises the steps:
(1) ardealite is aged 5d material A derived above；
(2) part of material A obtained by selecting step (1), and it is calcined 1.5 hours at 200 DEG C obtain
Material B, then cools down naturally by described material B；
(3) described material A and material B are mixed according to the percentage by weight of 93%:7%, obtain material C；
(4) in the described material C obtained by step (3), add the water of account for described material C gross weight 12%, stirring
Modified ardealite roadbed stuffing for expressway is obtained after uniformly.
Embodiment 3:
The preparation method of a kind of modified ardealite roadbed stuffing for expressway, comprises the steps:
(1) ardealite is aged 5d material A derived above；
(2) part of material A obtained by selecting step (1), and it is calcined 2 hours at 170 DEG C obtain thing
Material B, then cools down naturally by described material B；
(3) described material A and material B are mixed according to the percentage by weight of 92%:8%, obtain material C；
(4) in the described material C obtained by step (3), add the water of account for described material C gross weight 13%, stirring
Modified ardealite roadbed stuffing for expressway is obtained after uniformly.
Embodiment 4:
The preparation method of a kind of modified ardealite roadbed stuffing for expressway, comprises the steps:
(1) ardealite is aged 5d material A derived above；
(2) part of material A obtained by selecting step (1), and it is calcined 1.8 hours at 190 DEG C obtain
Material B, then cools down naturally by described material B；
(3) described material A and material B are mixed according to the percentage by weight of 91%:9%, obtain material C；
(4) in the described material C obtained by step (3), add the water of account for described material C gross weight 14.5%, stir
Modified ardealite roadbed stuffing for expressway is obtained after mixing uniformly.
Embodiment 5:
A kind of method using modified ardealite roadbed stuffing for expressway to prepare roadbed, comprises the steps:
(1) ardealite is aged 5d material A derived above；
(2) part of material A obtained by selecting step (1), and it is calcined 1.5 hours at 200 DEG C obtain
Material B, then cools down naturally by described material B；
(3) described material A and material B are mixed according to the percentage by weight of 91%:9%, obtain material C；
(4) in the described material C obtained by step (3), add the water of account for described material C gross weight 16%, stirring
Modified ardealite roadbed stuffing for expressway is obtained after uniformly；
(5) the described modified ardealite roadbed stuffing for expressway obtained by step (4) is paved, use road roller pair
Described modified ardealite roadbed stuffing for expressway is compacted, until natural Health preservation (water conservation) after its compactness >=96%, with this side
Formula, it is thus achieved that high stability and the roadbed of high waterproof.
Embodiment 6:
A kind of method using modified ardealite roadbed stuffing for expressway to prepare roadbed, it is characterised in that comprise the steps:
(1) ardealite is aged 5d material A derived above；
(2) part of material A obtained by selecting step (1), and it is calcined 2.5 hours at 160 DEG C obtain
Material B, then cools down naturally by described material B；
(3) described material A and material B are mixed according to the percentage by weight of 93%:7%, obtain material C；
(4) in the described material C obtained by step (3), add the water of account for described material C gross weight 12%, stirring
Modified ardealite roadbed stuffing for expressway is obtained after uniformly；
(5) the described modified ardealite roadbed stuffing for expressway obtained by step (4) is paved, use road roller pair
Described modified ardealite roadbed stuffing for expressway is compacted, until natural Health preservation after its compactness >=96%, in this way, it is thus achieved that
High stability and the roadbed of high waterproof.
Modified ardealite roadbed filling is applied to subgrade and pavement research experiment by the present invention, verifies this roadbed filling
Whether meet requirement, including CBR test, unconfined compression strength test, water stability testing, wetting-drying test and without lotus
Carry swelling rate test.
The present invention takes CBR to test, to obtain the CBR value of the compound under the conditions of different mixture ratio, with reference to " highway geotechnique
Testing regulations (JTJE40-2007) " carry out, prepare the examination in embodiment 5 and 6 according to optimum moisture content and maximum dry density platen press
Sample is tested, and result shows, the swell increment of ardealite is the least, and intensity meets the requirement of roadbed filling CBR >=8%, and passes through
Pure ardealite water stability is tested by same method, finds that pure ardealite water stability difference can not meet highway engineering road
The use requirement of based filler, therefore, utilizes calcined phosphogypsum as Binder Materials to be modified ardealite obtaining modified phosphorus
Gypsum, more can meet the use requirement of highway engineering subgrade filler.
Choose 7% calcined phosphogypsum, 9% calcined phosphogypsum to obtain the unconfined compressive strength under different mixture ratio, examination
Test result as shown in table 1:
Table 1 calcined phosphogypsum unconfined compression strength test result
According to above-mentioned result of the test it can be seen that ardealite adds 7-9% calcined phosphogypsum to improve ardealite 7d without
Confined compressive strength it is obvious that and all reach the requirement of strength of roadbed filling, calcined phosphogypsum is in ardealite intensity forming process
In play good gelatification, its water repelling property is also improved.
The present invention uses water stability testing, to verify the stability of calcined phosphogypsum modified ardealite further.Water is steady
Property good roadbed material, after immersion, loss of strength is little, and under different weather and seasonal conditions, pavement performance is stable.Due to phosphorus stone
Cream is a kind of hydroaropic substance, and a large amount of use ardealites are as its stability of roadbed material, and can meet requirement be needs
The problem of checking.The present invention is according to the non-confining strength recording intensity and 7d standard curing after the different condition 7d health of test specimen
The ratio of degree, the steady coefficient of water is as one of index evaluating calcined phosphogypsum modified ardealite water stability, result of the test such as table
2, shown in 3.
The table 2 7% steady result of the test of calcined phosphogypsum water
The table 3 9% steady result of the test of calcined phosphogypsum water
According to above-mentioned result of the test it can be seen that the water coefficient of stability of calcined phosphogypsum modified ardealite is preferable, water is stable
Coefficient k >=0.87；Along with the compression strength increasing calcined phosphogypsum compound of immersion number of days is gradually reduced, but its intensity is damaged
Mistake rate controls within 10%, and its intensity meets the requirement of basic unit's unconfined compressive strength >=1Mpa；9% calcined phosphogypsum changes
Property shows more preferable water stabilizing than 7% calcined phosphogypsum modification, but difference inconspicuous.Appropriate calcining is thus described
Ardealite is to the gelling improved in ardealite body, and the stability and the water repelling property that increase its internal structure have the biggest promotion
Effect, is a kind of well exciting agent.
Drying and watering cycle ability refer to its due in natural environment moisture change and produce opposing destroy ability, be calcining phosphorus
One of important mechanical index of gypsum modified ardealite mixing test specimen.The present invention takes wetting-drying test, joins obtaining difference
Ratio compound unconfined compressive strength in varied situations, result of the test is as shown in table 4,5.
Table 4 7% calcined phosphogypsum wetting-drying test
Table 5 9% calcined phosphogypsum wetting-drying test
By above-mentioned test data it can be seen that under the conditions of 1 drying and watering cycle, intensity increased；2 drying and watering cycles
Under the conditions of, intensity has reduction by a relatively large margin；Under the conditions of 3 drying and watering cycles, intensity increased on the basis of 2 circulations；
Under the conditions of drying and watering cycle, calcined phosphogypsum modified ardealite has part compared with unconfined compressive strength under the conditions of Standard Curing
Reduce, but the amplitude less (≤16.1%) reduced, and As time goes on, the amplitude of reduction can be less.
Modified ardealite roadbed filling is done no-load swelling rate test by the present invention, to obtain different mixture ratio compound
Breathing rate, this test performs with reference to " highway earthwork test rule " (JTJE51-2009), and result of the test is as shown in table 5.
Table 5 no-load swelling rate test result
By above-mentioned test data it can be seen that the free swelling rate of calcined phosphogypsum modified ardealite little (≤
13.9)；Along with the increase of calcined phosphogypsum consumption tapers off trend；Classify according to roadbed filling soil swelling engineering characteristic,
Understand phosphogypsum modification ardealite and be not belonging to intumescent material, thus act as roadbed filling.
The present invention according to the chemical characteristic of calcined phosphogypsum, ardealite is carried out under controlled temperature and time calcine as
Modifying agent, it is thus achieved that meet the roadbed filling that highway engineering requires, totally think, the modified ardealite roadbed stuffing for expressway of the present invention
Laboratory test result can meet the specification performance requirement of highway engineering subgrade.
As it will be easily appreciated by one skilled in the art that and the foregoing is only presently preferred embodiments of the present invention, not in order to
Limit the present invention, all any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, all should comprise
Within protection scope of the present invention.
Claims (6)
1. the preparation method of a modified ardealite roadbed stuffing for expressway, it is characterised in that comprise the steps:
(1) ardealite is aged 5d material A derived above；
(2) part for the material A obtained by selecting step (1), and it is calcined 1.5-2.5 hour at 160-200 DEG C
Obtain material B, then described material B is cooled down naturally；
(3) by described material A and naturally cooling after material B according to 91%～93%:7%～9% percentage by weight mixing
Uniformly, material C is obtained；
(4) in the described material C obtained by step (3), add the water of the 12-16% accounting for described material C gross weight, stirring
Modified ardealite roadbed stuffing for expressway is obtained after uniformly.
The preparation method of a kind of modified ardealite roadbed stuffing for expressway the most as claimed in claim 1, it is characterised in that for step
Suddenly for (2), calcining heat is 170-190 DEG C, and calcination time is 1.8-2.0 hour.
The preparation method of a kind of modified ardealite roadbed stuffing for expressway the most as claimed in claim 2, it is characterised in that for step
Suddenly, for (3), described material A is 92%:8% with the proportioning of material B.
The preparation method of a kind of modified ardealite roadbed stuffing for expressway the most as claimed in claim 3, it is characterised in that for step
Suddenly, for (4), the addition of water is account for described material C gross weight 14.5%.
5. one kind uses the method that modified ardealite roadbed stuffing for expressway prepares roadbed, it is characterised in that comprise the steps:
(1) ardealite is aged 5d material A derived above；
(2) part for the material A obtained by selecting step (1), and it is calcined 1.5-2.5 hour at 160-200 DEG C
Obtain material B, then described material B is cooled down naturally；
(3) by described material A and naturally cooling after material B according to 91%～93%:7%～9% percentage by weight mixing
Uniformly, material C is obtained；
(4) in the described material C obtained by step (3), add the water of the 12-16% accounting for described material C gross weight, stirring
Modified ardealite roadbed stuffing for expressway is obtained after uniformly；
(5) the described modified ardealite roadbed stuffing for expressway obtained by step (4) is paved, use road roller to described
Modified ardealite roadbed stuffing for expressway is compacted, until natural Health preservation after its compactness >=96%, in this way, it is thus achieved that Gao Wen
Qualitative and the roadbed of high waterproof.
6. a modified ardealite roadbed stuffing for expressway, it is characterised in that this roadbed filling is common by material A, material B and water
Mixing, wherein material A is the ardealite of ageing more than 5d, and material B is at 160-200 DEG C by the ardealite of ageing more than 5d
Lower calcining 1.5-2.5 hour and the calcined phosphogypsum that obtains, and between material A and material B according to weight ratio be 91%～
93%:7%～9% prepares, and described water then accounts for material A and the 12-16% of material B gross weight.
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| CN108275931B (en) * | 2018-01-26 | 2020-12-18 | 湖北恒沁环保科技有限责任公司 | Phosphogypsum modified material and application thereof in road base |
| CN109384444B (en) * | 2018-11-13 | 2021-07-16 | 湖北恒沁环保科技有限责任公司 | Soft foundation material prepared by solidifying sludge and preparation method thereof |
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| CN109626925B (en) * | 2018-12-26 | 2021-12-24 | 四川绵筑新材料有限公司 | Preparation method of phosphogypsum roadbed material based on high-temperature activation and hydraulic property improvement |
| CN109467379A (en) * | 2019-01-11 | 2019-03-15 | 中化重庆涪陵化工有限公司 | The laying method of ardealite roadbed material and preparation method thereof and ardealite roadbed |
| CN111320446B (en) * | 2020-02-29 | 2022-10-21 | 湖北省建筑工程质量监督检验测试中心 | High-strength self-waterproof phosphogypsum roadbed material and preparation method thereof |
| CN112533314A (en) * | 2020-12-01 | 2021-03-19 | 合肥工业大学 | Method for modifying expansive soil by microwave heating |
| CN114702293A (en) * | 2022-03-29 | 2022-07-05 | 武汉华中科大检测科技有限公司 | Stable phosphogypsum pavement subbase layer material and preparation method, construction method and application thereof |
| CN116041024A (en) * | 2022-12-22 | 2023-05-02 | 湖北交投智能检测股份有限公司 | Preparation method of phosphogypsum highway subgrade material |
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| JPH08225320A (en) * | 1994-12-22 | 1996-09-03 | Mitsui Toatsu Chem Inc | Modification of alpha-hemihydrate gypsum obtained as by-product of wet-process for producing phosphoric acid |
| GB0314655D0 (en) * | 2003-06-24 | 2003-07-30 | Bpb Plc | Method and apparatus for producing a multilayer cementitious product |
| CN102731000B (en) * | 2012-06-27 | 2013-10-23 | 贵州川恒化工有限责任公司 | Method for producing building gesso by using semi-hydrated phosphogypsum and dihydrate phosphogypsum |
| CN102815915B (en) * | 2012-08-01 | 2014-05-07 | 贵州开磷（集团）有限责任公司 | Modified phosphorus gypsum consolidating layer material for road and preparation method thereof |
| CN103601461A (en) * | 2013-12-02 | 2014-02-26 | 贵州皆盈科技开发有限公司 | Filling material |
| CN104310823A (en) * | 2014-09-26 | 2015-01-28 | 青岛精益信电子技术有限公司 | Phosphogypsum modifying method |
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