CN105758761B - The measuring method of type III anhydrous gypsum content in a kind of building gypsum - Google Patents
The measuring method of type III anhydrous gypsum content in a kind of building gypsum Download PDFInfo
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- CN105758761B CN105758761B CN201610115161.4A CN201610115161A CN105758761B CN 105758761 B CN105758761 B CN 105758761B CN 201610115161 A CN201610115161 A CN 201610115161A CN 105758761 B CN105758761 B CN 105758761B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/02—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by absorbing or adsorbing components of a material and determining change of weight of the adsorbent, e.g. determining moisture content
Abstract
The present invention provides a kind of measuring methods of type III anhydrous gypsum content in building gypsum, comprising the following steps: first under humid conditions, the building gypsum plaster after building gypsum plaster sample is placed moisture absorption, after obtaining moisture absorption；Then building gypsum plaster after moisture absorption above-mentioned steps obtained is after drying to constant weight, the building gypsum plaster to be increased weight；The quality of the building gypsum plaster for the weight gain that finally above-mentioned steps are obtained and the quality of the building gypsum plaster sample obtain the content of type III anhydrous gypsum in building gypsum plaster sample after calculating.The present invention can faster detect the mass fraction of type III anhydrous gypsum in the sample, and the detection used time is short, data are accurate, easy to operate, safe and reliable, and without reference any chemical reagents, the sample after detection can be continued to use, no pollution to the environment.
Description
Technical field
The invention belongs to type III anhydrous gypsums in construction material analysis technical field more particularly to a kind of building gypsum to contain
The measuring method of amount.
Background technique
With the continuous improvement and urbanization of people's quality of life, the demand to building house is also increasingly soaring, to building
The demand of material is also increasing, also increasingly stringent to the requirement of quality accordingly, especially indoor building material, builds among these
Building gypsum is the biggish construction material of dosage.
Building gypsum (beta-type semi-hydrated gypsum or common gypsum powder), with β semi-hydrated gypsum CaSO4·1/2H2O is main component.
It is mainly used for indoor plastering and painting, prepares plasterboard, gypsum block and ornament materials etc..Such as by building gypsum Jia Shui, sand and
Retarder mix is used for indoor plastering and painting at gypsum mortar.Smooth, fine and smooth, the pure white beauty in surface after plastering, gypsum sand
Slurry can also be used as the prime coat of paint etc., and can direct brushing paint or stickup wall paper or wallpaper etc..Building gypsum add water and
Retarder mix is alternatively arranged as interior painting coating at gypsum slurry.By natural dihydrate gypsum, chemical formula CaSO4.2H2O,
Different gypsum kinds can be obtained in calcining at different temperature.Drying condition such as by natural dihydrate gypsum at 107~170 DEG C
Lower heating can obtain building gypsum.
Type III anhydrous gypsum in building gypsum plaster is excessively the major reason for causing plastering gupsum quality problems.III
Type anhydrous gypsum, also known as anhydrous gypsum III or soluble anhydrite, excessively will lead to the consumptive use of water normal consistence of building gypsum
It is unstable, setting time is unstable, strength reduction, while doing plastering gupsum using the excessive gypsum of type III anhydrous gypsum and can lead
It causes unstable plastering gupsum setting time, cracking, intensity low, causes accident resulting from poor quality of projects.Dawn blueness is such as talked in " desulfurization paring stone
Cream three-phase analysis technique study and application " it mentions, type III anhydrous gypsum causes powder consumptive use of water normal consistence to increase, intensity drops
It is low, setting time is unstable.Thus, controlling type III anhydrous gypsum content in building gypsum plaster is to guarantee plastering gupsum quality
It is crucial.However the producer of domestic production gypsum often in order to improve the production efficiency, so that calcination temperature is higher, and then obtains at present
Land plaster in type III anhydrous gypsum content it is more, and ignore type III anhydrous gypsum content excessive bring adverse effect,
The phenomenon that land plaster burning occur is generally existing, brings very burden using the producer or process of land plaster to subsequent.Institute
With, the type III anhydrous gypsum content height in domestic building gypsum has become a critical issue of building gypsum quality problems,
It is the paring stone because of the type III anhydrous gypsum for using content high that the main reason for construction market plastering gupsum quality fluctuation is also mostly
Cream powder causes, and can lead to that plastering gupsum setting time is unstable, water requirement difference is big, backfin strength fluctuation is big, after upper wall
It cracks, the common quality defects such as hollowing.Therefore, in order to solve these quality problems, it is necessary to type III in strict control plastering gupsum
Anhydrous gypsum content.
Type III anhydrous gypsum content in building gypsum is controlled, what we first had to do be exactly to type III without
Water gypsum content carries out quantitative test and assessment, is detected in the method for type III anhydrous gypsum at present using alcohol method by many people
Received, but this method needs the time long, and alcohol in high concentration is inflammable and explosive, security risk is increased, after test
Sample is reunited, and sample recycling is unfavorable for；And other detection method such as differential thermal analysis are used, halogen detection method etc. needs
Expensive equipment, although the short general medium-sized and small enterprises of detection time are difficult to afford so expensive experimental facilities, and operate
Complexity is to personnel qualifications height.
Therefore, a kind of measuring method of type III anhydrous gypsum content in building gypsum how is obtained, quickly and operation letter
Just, and easy to spread, it has also become the producer's urgent problem to be solved for thering is prediction to realize in industry.
Summary of the invention
In view of this, the technical problem to be solved in the present invention is that providing type III anhydrous gypsum content in building gypsum
Measuring method, test method provided by the invention compares traditional test method, quick, easy to operate, easy to spread, and has
Preferable stability and repeatability.
The present invention provides a kind of measuring methods of type III anhydrous gypsum content in building gypsum, comprising the following steps:
A) under humid conditions, the building gypsum plaster after building gypsum plaster sample being placed moisture absorption, after obtaining moisture absorption；
B) building gypsum plaster after the moisture absorption for obtaining above-mentioned steps is after drying to constant weight, the building gypsum to be increased weight
Powder；
C) quality of the building gypsum plaster for the weight gain for obtaining above-mentioned steps and the quality of the building gypsum plaster sample pass through
After crossing calculating, the content of type III anhydrous gypsum in building gypsum plaster sample is obtained.
Preferably, the condition of the humidity is constant humidity.
Preferably, the humidity of the condition of the humidity is 80%~100%.
Preferably, the time of the moisture absorption is 25~120 minutes.
Preferably, the temperature of the drying is 40~55 DEG C.
Preferably, the fineness of the building gypsum plaster sample is less than or equal to 80 mesh.
Preferably, the placement is specially to tile in the plane.
Preferably, the overlay thickness of the tiling is 1~5mm.
Preferably, the method for the calculating is that the quality of the building gypsum plaster sample is m1, the paring stone of the weight gain
The quality of cream powder is m2, the quality of the moisture of the building gypsum plaster sample moisture absorption is m；
The m=m2-m1；
The content is mass content, and the mass content of type III anhydrous gypsum is w in the building gypsum plaster sample；
W=(the 15.11*m/m1) * 100%.
The present invention provides a kind of measuring methods of type III anhydrous gypsum content in building gypsum, comprising the following steps: first
First under humid conditions, the building gypsum plaster after building gypsum plaster sample being placed moisture absorption, after obtaining moisture absorption；It then will be above-mentioned
Building gypsum plaster after the moisture absorption that step obtains is after drying to constant weight, the building gypsum plaster to be increased weight；Finally by above-mentioned steps
The quality of the building gypsum plaster of obtained weight gain and the quality of the building gypsum plaster sample obtain building gypsum after calculating
The content of type III anhydrous gypsum in powder sample.Compared with prior art, the present invention has very strong using type III anhydrous gypsum
Hygroscopicity can be rapidly converted into semi-hydrated gypsum under high humidity conditions, and semi-hydrated gypsum is converted to dihydrate gypsum and needs in powder
Moisture content can just occur when reaching certain ratio, and reaction speed generates slow more of semi-hydrated gypsum than type III anhydrous gypsum,
It can faster detect the mass fraction of type III anhydrous gypsum in the sample, either production is still using land plaster
Producer can control the quality of building gypsum plaster well, improve the quality of product, and without reference any chemical reagents；
Compared to alcohol method, differential thermal analysis or halogen detection method etc., the present invention is according to the aquation of type III anhydrous gypsum and β semi-hydrated gypsum
The difference of characteristic, using high humidity environment aging method, the detection used time is short, data are accurate, after easy to operate, safe and reliable, detection
Sample can continue to use, no pollution to the environment.The experimental results showed that the test result of measuring method provided by the invention with
It is consistent that alcohol in GB/T " building gypsum crystal species analysis method " standard impregnates Oven Method test result, and the testing time from
It shortens to less than 100 minutes within 240 minutes or so, greatly shortens detection time, improve work efficiency, accelerate the inspection of material
It tests, evaluate and the speed of site acceptance.
Specific embodiment
In order to further appreciate that the present invention, the preferred embodiments of the invention are described below with reference to embodiment, but
It is it should be appreciated that these descriptions only require the invention patent to further illustrate the features and advantages of the present invention
Limitation.
All raw materials of the present invention, are not particularly limited its source, buying on the market or according to those skilled in the art
The preparation of conventional method known to member.
All raw materials of the present invention, are not particularly limited its purity, pure present invention preferably employs analyzing.
The present invention provides a kind of measuring methods of type III anhydrous gypsum content in building gypsum, comprising the following steps:
A) under humid conditions, the building gypsum plaster after building gypsum plaster sample being placed moisture absorption, after obtaining moisture absorption；
B) building gypsum plaster after the moisture absorption for obtaining above-mentioned steps is after drying to constant weight, the building gypsum to be increased weight
Powder；
C) quality of the building gypsum plaster for the weight gain for obtaining above-mentioned steps and the quality of the building gypsum plaster sample pass through
After crossing calculating, the content of type III anhydrous gypsum in building gypsum plaster sample is obtained.
The building gypsum plaster sample is not particularly limited in the present invention, with building gypsum well known to those skilled in the art
, i.e. beta-type semi-hydrated gypsum or common gypsum powder, with β semi-hydrated gypsum CaSO4·1/2H2O is main component, by dihydrate gypsum
(CaSO4·2H2O it is obtained after) being heated under 107~170 DEG C of drying condition.The present invention does not have the building gypsum plaster sample
Other are especially limited, and those skilled in the art can be adjusted and select, this hair according to actually detected situation or testing requirements
The fineness of the bright building gypsum plaster sample is preferably smaller than equal to 80 mesh, more preferably less than or equal to 85 mesh, most preferably 80~90 mesh.
The type III anhydrous gypsum is not particularly limited in the present invention, is with type III anhydrous gypsum well known to those skilled in the art
Can, i.e. anhydrous gypsum III or soluble anhydrite.
The present invention first under humid conditions, after building gypsum plaster sample is placed moisture absorption, building after obtaining moisture absorption
Land plaster；The condition of the humidity is not particularly limited in the present invention, with the tide well known to those skilled in the art for detection
Under conditions of wet, the humidity under conditions of humidity of the present invention is preferably constant humidity, more preferably 80%~
100%, more preferably 85%~99%, more preferably 90%~98%, most preferably 90%~97%.The present invention is to the tide
Wet condition can be wanted without other concrete restrictions, those skilled in the art according to actually detected situation, amount of samples or detection
It asks and is adjusted and selects.
The mode of the placement is not particularly limited in the present invention, and those skilled in the art can be according to actually detected feelings
Condition, amount of samples or testing requirements are adjusted and select, and the present invention is to enable the uniform moisture absorption of building gypsum plaster sample, described
Placement is particularly preferred as tiling in the plane, is more preferably laid on surface plate, is most preferably loosely laid on surface plate；This
The thickness loosely to tile is not particularly limited in invention, and those skilled in the art can be according to actually detected situation, sample
Dosage or testing requirements are adjusted and select, and the present invention is preferably 1~5mm, more preferably 1.5~4.5mm, and more preferably 2
~4mm, most preferably 2.5~3.5mm.The time of the placement, the i.e. time of moisture absorption is not particularly limited in the present invention, this hair
The bright condition to the humidity can be used without other concrete restrictions, those skilled in the art according to actually detected situation, sample
Amount or testing requirements are adjusted and select, and the present invention is preferably 25~120 minutes, and more preferably 30~100 minutes, more preferably
It is 40~80 minutes, most preferably 50~70 minutes.
The present invention especially limits the above-mentioned specific steps for obtaining the building gypsum plaster after moisture absorption without other, this field skill
Art personnel can be adjusted and select according to actually detected situation, amount of samples or testing requirements, the present invention be convenient for detection,
Save the cost and raising practicability, are particularly preferred as:
1, plastic seal box with cover is taken, the deep water of 5cm or so is packed into box；
2, into the water, cushion block is higher by 2~4cm of the water surface to cushion block, and one piece of shelf is placed on cushion block；
3, hygrometer is put into above shelf, covers box cover sealing and places in laboratory；
4, when hygrometer shows 80% or more, can start to test；
5, building gypsum plaster sample m is weighed1, then sample is paved a thin layer on surface plate, paving thickness is less than
Sample is put into above the shelf of high humidity container rapidly by 5mm together with surface plate, and seals high humidity container immediately.
6, sample saves 30~120 minutes in high humidity sealing container.
The present invention provides the environment of a stable constant humidity, i.e. high humidity is close using above-mentioned simple device combination
Container is sealed, first in closed container, the natural volatilization of water can make the humidity of closed environment reach 80% or more, according to certain
Saturated vapor depresses the decision water content of air,
dV=(Pb/ 760) × (1000/22.4) × (273) ÷ (273+t) × 18,
Wherein, dVFor every m when steam-laden under different temperatures3The water content (g) of gas；PbIt is lauched for different temperatures
Saturated vapour pressure (mm, Hg), t are temperature (DEG C)；
25 DEG C of saturation of the air saturated vapour pressures (mm, Hg), Pb=23.75, calculate to obtain dV=23.01 (g/m3),
If temperature is 20 DEG C~25 DEG C, when humidity variation 90%~100%, the aqueous concentration of air is 0.015~
0.023g/L。
And building gypsum plaster sample, at loose thin booth, gas is easy to be diffused into powder particles surface, according to molecule
Theory of Brownian motion, the hydrone in air can also be diffused into gypsum powder body surface, and this can react therewith, then entirely
Type III anhydrous gypsum activity is high in the process, has very high hygroscopicity, and the hydrone in air is easy to by the anhydrous stone of type III
Cream adsorbs and carries out generation phase transition, and steam is consumed in sealing container, and can be supplemented from the water of container, to guarantee
The concentration of air water molecule maintains a stable value, and inversion of phases is allowed persistently to carry out, in the environment of humidity is greater than 80% type III without
Water gypsum can be quickly converted as semi-hydrated gypsum, and reactive chemistry equation is 2CaSO4+H2O=2CaSO4·1/2H2O is compared
Traditional alcohol method, the water concentration in alcohol liquid is about 40g/L, and the water concentration in high wet process is up to 0.023g/L, only
It is the 0.5% of alcohol method, thus less has semi-hydrated gypsum and be converted into dihydrate gypsum and only have type III anhydrous gypsum that can be converted into half
Water gypsum.More important is the gypsum phases that the gypsum of above-mentioned steps provided by the invention, i.e. high humility ageing is impregnated with alcohol
Than liquid phase is lower in land plaster, so that subsequent drying time is shorter.
Then after drying to constant weight, that is increased weight builds the building gypsum plaster after the moisture absorption that obtains above-mentioned steps the present invention
Build land plaster.The temperature of the drying is not particularly limited in the present invention, is with drying temperature well known to those skilled in the art
Can, the temperature of drying of the present invention is preferably 40~55 DEG C, more preferably 43~52 DEG C, more preferably 45~50 DEG C, optimal
It is selected as 46~49 DEG C.The equipment of the drying is not particularly limited in the present invention, is set with drying well known to those skilled in the art
Standby, the present invention is preferably baking oven；The other conditions of the drying are not particularly limited in the present invention, those skilled in the art
It can be adjusted and select according to actually detected situation, amount of samples or testing requirements.
The matter of the quality of the building gypsum plaster for the weight gain that the present invention obtains above-mentioned steps and the building gypsum plaster sample
Amount obtains the content of type III anhydrous gypsum in building gypsum plaster sample after calculating.
Content of the present invention is preferably mass content；The calculating step is not particularly limited in the present invention, with ability
Conventional Calculation Method known to field technique personnel, circular of the present invention are preferably the building gypsum plaster sample
Quality can be set as m1, the quality of the building gypsum plaster of the weight gain can be set as m2, the building gypsum plaster sample suction
The quality of wet moisture can be set as m, and the mass content of type III anhydrous gypsum is set as w in the building gypsum plaster sample；
Thus, the m=m2-m1,
W=(the 15.11*m/m1) * 100%, wherein 15.11 ≈ MCaSO4/0.5MH2O。
If shown without type III anhydrous gypsum in sample, the water containing absorption as m≤0.
The present invention finally takes out sample from high humidity container and is moved into drying in oven immediately to constant weight, is dried to perseverance
Weight, using the content for having obtained type III anhydrous gypsum in building gypsum after calculating, the present invention uses the side of high humidity promoting ageing
Method can quickly and easily detect that type III anhydrous gypsum content in building gypsum, this method do not need the expensive equipment of purchase
And any test reagent, only need balance, baking oven, closed container etc. that can quickly detect the content of type III anhydrous gypsum,
The test result of alcohol method in experimental result and national standard " building gypsum crystal species analysis method " paper for approval has very high one
Cause property, but the time used in experiment overall process substantially contracts than the alcohol method in national standard " building gypsum crystal species analysis method " paper for approval
It is short.Not only operability is also very strong for this method, but also can help the manufacturing enterprise of building gypsum raw material and plastering gupsum more
Simply and effectively control product quality.The present invention is simple using equipment, operation is convenient, and detection data is accurate, in the detection process
Other reagents are not needed in addition to water, and the product of detection can recycle, and be truly realized the zero-emission to environment.
Practical significance of the invention is that the type III anhydrous gypsum content height in domestic building gypsum has become building
One critical issue of gypsum quality problem, but in current building gypsum GB/T9776-2008 " building gypsum " 9776-2008 only
The content of semi-hydrated gypsum is required, the content of type III anhydrous gypsum is not required, this is also many building gypsums
Powder enterprise thinks little of a factor of type III anhydrous gypsum content.Because type III anhydrous gypsum can be converted to β half in air
Water gypsum, people only focus on final product, and ignore in product and adversely affect with type III anhydrous plaster powder bring.GB/
Also not specifically for the quantitative analysis method of type III anhydrous gypsum in T5484-2012 " chemical analysis of gypsum method ".Due to
The missing of relevant criterion, although many enterprises both know about the type III anhydrous gypsum in building gypsum and should control, due to not having
Test method and evaluation criterion, there is no to type III anhydrous gypsum for building gypsum plaster manufacturing enterprise in actual production process
It is controlled.As industrialized process is getting faster, the land plaster produced can transport factory by tank car quickly
Family, and manufacturer is also equipped with storage tank mostly, so the type III anhydrous gypsum in land plaster is just more difficult to and air
It contacts and is transformed into semi-hydrated gypsum.In addition the product packaging of production also all has better sealing, the anhydrous stone of the type III more made
Cream is transformed into semi-hydrated gypsum naturally and becomes difficult, and has aggravated influence of the type III anhydrous gypsum to quality.Wuhan University of Technology in 2012
Yang Xin Asia professor organizes related scientific research institutes and gypsum raw material, finished product enterprise to formulate " building gypsum crystal species analysis method "
National standard, and carried out declaration in the end of the year in 2014, had in this standard to type III anhydrous gypsum test method detailed
Regulation, as alcohol method, since the testing time is longer, carries out quality although experimental result repeatability is preferably in actual production
Control is difficult.
However the type III anhydrous gypsum content detected in land plaster is very important to land plaster producer, it can root
It is adjusted according to the temperature and calcination time of how many pairs of calcinings of type III anhydrous gypsum content, so that production technology is more reasonable, has
Conducive to raising product quality, while can be controlled according to how many pairs of land plaster digestion times of type III anhydrous gypsum content, it is complete
Kind product is insufficient, and plastering gupsum producer can control land plaster quality by type III anhydrous gypsum content in land plaster, and
Type III anhydrous gypsum content can be quickly detected using high humidity ageing method provided by the invention, judges the quality of land plaster in time
It is whether qualified, more rapidly and efficiently.
The experimental results showed that the test result of measuring method provided by the invention and GB/T " building gypsum crystal species analysis
Method " to impregnate Oven Method test result consistent for the alcohol in standard, and the testing time shortened to from 240 minutes or so and is less than
100 minutes, detection time is greatly shortened, is improved work efficiency, the speed of the inspection of material, evaluation and site acceptance is accelerated
Degree.
It is anhydrous to type III in building gypsum provided by the invention below with reference to embodiment for a further understanding of the present invention
The measuring method of gypsum content is illustrated, and protection scope of the present invention is not limited by the following examples.
Sample source:
The building gypsum that this experiment is selected provides for Shanxi Lucheng Gypsum Mine, calcium sulphate content 60.0~65.0%, carbonic acid
Calcium 35.0~40.0%, other contents are less than 1%.
Embodiment 1
Plastic seal box with cover is taken first, the deep water of 5cm or so is packed into box, into the water, cushion block height is discharged cushion block
2~4cm of face places one piece of shelf on cushion block, hygrometer is put into above shelf, covers box cover sealing and places in laboratory,
Obtain high humidity sealing container.When hygrometer shows 80%~100%, can start to test.
It then is the building gypsum plaster sample m of 80~90 mesh by load weighted fineness1(5g) paves one thin on surface plate
Layer, paving thickness are 1~5mm, are rapidly put into sample above the shelf of high humidity container together with surface plate, and seal high humidity immediately
Container, after sample saves 30 minutes in high humidity sealing container, the building gypsum plaster after obtaining moisture absorption, above-mentioned sample from high humidity
It is taken out in container and is moved into 40 DEG C of drying in oven immediately to constant weight, drying to constant weight, the building gypsum plaster to be increased weight.
After finally the building gypsum plaster sample wait increase weight is cooled to room temperature, weighing sample quality is m2, participate in the water of reaction
Quality be m=m2-m1, the mass percent of type III anhydrous gypsum is w=15.11*m/m in sample1* 100%；
Using above-mentioned steps, it is 85% and 95% two kind that humidity, which is respectively adopted, and paving thickness is 2mm and two kinds of 4mm, is obtained
1# sample and 2# sample.
Store 30 minutes respectively in closed high humidity environment, 60 minutes, 120 minutes, then 40 DEG C of degree drying in oven extremely
Constant weight is compared with the data for using GB/T " building gypsum crystal species analysis method " alcohol method to test, and referring to table 1, table 1 is
High humidity ageing method different time provided by the invention and alcohol method compare.
The high humidity ageing method different time provided by the invention of table 1 and alcohol method compare
As shown in Table 1, test method provided by the invention is dried at 40 DEG C can reach constant weight for 60 minutes, and alcohol method is dried
Still there is apparent liquid within dry 60 minutes, generally to dry 180 minutes could constant weight.And have in the land plaster of ripening of the present invention
Seldom water vapour, drying is fast, has excessive liquid (alcohol and water) in the gypsum of alcohol method processing, needs more times
It can drying.
It can see and stored either under high humidity environment 30 minutes or 60 minutes or 120 minutes by the table,
It is calculated it is anhydrous be gypsum content be all 22% or so, and calculated anhydrous gypsum content is answered by Random data processing
Data are handled with F test in excel, double tail probabilities when F value is the variance no significant difference of two groups of data, significantly
Property horizontal general situation a value be 0.05, be compared when often by double tail probabilities F values with significance a=0.05, when F value
When more than or equal to 0.05, significance is low, and confidence level is high, it is believed that two groups of data are with value；When F is less than 0.05, show
Work property is horizontal high, and confidence level is low, it is believed that two groups of data are different value.
F test show that the F value stored 30 minutes and stored 60 minutes is 0.34, and stores 60 minutes and storage 120 minutes
F value be 0.41.Therefore storage 30 minutes are considered with storage with group numerical value for 120 minutes.So storing 30 points under high humidity environment
Clock, the type III anhydrous gypsum in sample can be completely converted into as semi-hydrated gypsum.And use survey with alcohol method for storage 30 minutes
The F value of examination is 0.53, therefore the numerical value that two kinds of test methods obtain is consistent.Less than 100 the time required to closed high humidity ageing method test
Minute, and alcohol method is at least also required to 220 minutes or more.(here without plus weigh sample and sample cooling time)
Type III anhydrous gypsum is only transformed into half water to verify the phase composition of the gypsum Jing Guo method provided by the invention
There is no becoming, we divide the phase composition of raw sample and the gypsum after high humidity ageing method for gypsum and other components
Analysis.
The high humidity ageing method that first sample is provided through the invention is aged 30 minutes, is then taken out sample, to ageing method
Gypsum carry out facies analysis, while facies analysis composition test is carried out to the gypsum of raw sample (without ageing), test uses state
The method for marking " building gypsum crystal species analysis method " paper for approval.For test result referring to table 2, table 2 is two kinds of building gypsum samples
Dihydrate gypsum mass percent and semi-hydrated gypsum mass percent and anhydrous gypsum mass percent.
The dihydrate gypsum mass percent and semi-hydrated gypsum mass percent of 2 two kinds of building gypsum samples of table and anhydrous stone
The mass percent of cream
By the test result of table 2 it can be found that there is no anhydrous gypsum presence in the gypsum samples after ageing method, and
It is analyzed with data of the Fest of excel to dihydrate gypsum, obtaining F value is 0.77, illustrates aged 30 minutes gypsum samples
Type III anhydrous gypsum in sample is all transformed into β semi-hydrated gypsum, and type III anhydrous gypsum and β semi-hydrated gypsum by product
Do not generate dihydrate gypsum.
It is that the type III in sample is anhydrous in sample further to verify closed high humidity ageing method provided by the invention
Gypsum is transformed into β semi-hydrated gypsum, and β semi-hydrated gypsum and type III anhydrous gypsum are not converted to dihydrate gypsum, separately takes a collection of sample
It is tested.This method used is to carry out follow-on test with a sample gypsum, first use high humidity ageing method and alcohol method into
The test of row type III anhydrous gypsum, then the method according to national standard " building gypsum crystal species analysis method " paper for approval is old to high humidity
The sample that change method and alcohol method are tested carries out the test of semi-hydrated gypsum and dihydrate gypsum content, and test result is referring to table 3, table 3
Semi-hydrated gypsum and two water after testing anhydrous gypsum content for test method provided by the invention and alcohol method and test in sample
Gypsum Comparative result.
Half water after the test method provided by the invention of table 3 and alcohol method test anhydrous gypsum content and test in sample
Gypsum and dihydrate gypsum Comparative result
Data are analyzed using F test formula in excel, calculate type III in the sample of different detection method tests
The F value of anhydrous gypsum is that the F value of 0.47, β semi-hydrated gypsum is 0.70, and the F value of dihydrate gypsum is 0.07, can by the calculating of F value
Different detection methods is used to see, the mass percent of each component is identical in calculated gypsum.
Thus using the measuring method of type III anhydrous gypsum content in building gypsum provided by the invention, i.e. high humility is old
Change method can be used to quickly detect the type III anhydrous gypsum mass percentage in building gypsum.
The anhydrous gypsum percentage composition that two different methods detect is essentially identical, and to two kinds of processing methods of process
Sample carries out facies analysis again, and semi-hydrated gypsum and the dihydrate gypsum all difference tested out are little, by the variance of data without obvious poor
Double tail probabilities F-test in different time are calculated, we obtain the result no significant difference tested using two methods, this is absolutely proved
Type III anhydrous gypsum is tested using type III anhydrous gypsum content in high humidity environment ageing method test architecture gypsum and alcohol method
The result is that identical, and high wet process takes short, operates simpler.
The measuring method of type III anhydrous gypsum content in a kind of building gypsum provided by the present invention has been carried out in detail above
It is thin to introduce.Used herein specifically principle and implementation of the present invention are described for a example, above embodiments
Illustrate to be merely used to help understand method and its core concept of the invention.It should be pointed out that for the common skill of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for art personnel, these change
It is also fallen within the protection scope of the claims of the present invention into modification.
Claims (7)
1. the measuring method of type III anhydrous gypsum content in a kind of building gypsum, which comprises the following steps:
A) building gypsum plaster under conditions of room temperature humidity, after building gypsum plaster sample is placed moisture absorption, after obtaining moisture absorption；
The time of the moisture absorption is 25~120 minutes；
B) building gypsum plaster after the moisture absorption for obtaining above-mentioned steps is after drying to constant weight, the building gypsum plaster to be increased weight；
C) quality of the building gypsum plaster for the weight gain for obtaining above-mentioned steps and the quality of the building gypsum plaster sample are by counting
After calculation, the content of type III anhydrous gypsum in building gypsum plaster sample is obtained；
The method of the calculating specifically:
The quality of the building gypsum plaster sample is m1, the quality of the building gypsum plaster of the weight gain is m2, the building gypsum plaster
The quality of the moisture of sample moisture absorption is m；
The m=m2-m1；
The content is mass content, and the mass content of type III anhydrous gypsum is w in the building gypsum plaster sample；
W=(the 15.11*m/m1) * 100%.
2. measuring method according to claim 1, which is characterized in that the condition of the humidity is constant humidity.
3. measuring method according to claim 1, which is characterized in that the humidity of the condition of the humidity be 80%~
100%.
4. measuring method according to claim 1, which is characterized in that the temperature of the drying is 40~55 DEG C.
5. measuring method according to claim 1, which is characterized in that the fineness of the building gypsum plaster sample is less than or equal to
80 mesh.
6. measuring method according to claim 1, which is characterized in that the placement is specially to tile in the plane.
7. measuring method according to claim 6, which is characterized in that the overlay thickness of the tiling is 1~5mm.
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| EP4253341A1 (en) * | 2022-03-30 | 2023-10-04 | Saint-Gobain Placo | Method and system for measuring phase components in calcium sulphate material |
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| CN101514981A (en) * | 2008-02-21 | 2009-08-26 | 北新集团建材股份有限公司 | Method for rapidly analyzing phase composition of building gypsum powder |
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| ES2271506T3 (en) * | 2003-12-19 | 2007-04-16 | Lafarge Platres | PROCEDURE AND APPARATUS FOR STABILIZING PLASTER. |
| CN202297399U (en) * | 2011-10-14 | 2012-07-04 | 北新集团建材股份有限公司 | Equipment for modifying gypsum powder |
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| US4849175A (en) * | 1984-05-16 | 1989-07-18 | Societe Des Ciments Francais | Apparatus for automatically determining certain characteristics of cement |
| CN101514981A (en) * | 2008-02-21 | 2009-08-26 | 北新集团建材股份有限公司 | Method for rapidly analyzing phase composition of building gypsum powder |
| CN102175555A (en) * | 2011-01-31 | 2011-09-07 | 上海市建筑科学研究院(集团)有限公司 | Method for quickly analyzing phase component of building gypsum |
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