CN101482487B - Test method and test device for chemical contraction of cement - Google Patents
Test method and test device for chemical contraction of cement Download PDFInfo
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- CN101482487B CN101482487B CN2009100461280A CN200910046128A CN101482487B CN 101482487 B CN101482487 B CN 101482487B CN 2009100461280 A CN2009100461280 A CN 2009100461280A CN 200910046128 A CN200910046128 A CN 200910046128A CN 101482487 B CN101482487 B CN 101482487B
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Abstract
The invention relates to a testing method and device of cement chemical shrinkage, composed of a glass burette, a glass pycnometer, a magnetic stirrer and a steel ball. The testing method comprises the following steps: loading the cement sampler to be tested and the steel ball into the glass pycnometer; adding water and uniformly stirring the mixture; closely connecting the burette and pycnometer and adding solution until the full scale of the burette; keeping the cement slurry to be tested rotating using the magnetic stirrer and the steel ball; recording the chemical shrinkage amount at different time based on the liquid level change in burette. The cement chemical shrinkage change can be monitored at real time based on ensuring the cement fully being hydrated.
Description
Technical field
The present invention relates to method of testing and proving installation that a kind of chemistry of cement shrinks.
Background technology
In the hardening of cement process because the volume-diminished that hydration reaction produced takes place, the chemical shrinkage that is called as cement, in theory, the chemical shrinkage total amount that the complete aquation of 100g portland cement is produced is 7-9ml, tradition adopts fluid-discharge therapy test chemical shrinkage value, and the cement that is about to constant weight is packed in the vial, after adding water and stirring with the bottle stopper jam-pack bottleneck of vial with the band graduated tube, in vial, be full of water or other liquid then to full scale, represent the chemical shrinkage amount by SEA LEVEL VARIATION.Because add water at cement, stir stop after, no matter adopt great water cement ratio slurry always to precipitate and form hardenite, to produce pore owing to chemical shrinkage in hardenite inside, when adopting, also can produce the hole that a lot of stirrings are introduced than low water-cement ratio, the water of hardenite outside can't infiltrate the less micropore of part, thereby makes SEA LEVEL VARIATION can not truly reflect the chemical shrinkage amount.The self-desiccation that chemical shrinkage and hardenite inside take place in cement hydration process simultaneously shrinks, thus classic method record not only comprise chemical shrinkage, also the cement self-desiccation is shunk be also contained in; On the other hand, the cement clinker particle is closely wrapped up by surface hydration product and other cement additives on every side, makes the inner degree of hydration of cement granules very low.So, the test value that adopts traditional fluid-discharge therapy much smaller than complete aquation the chemical shrinkage amount that can take place.
Chemical shrinkage is the intrinsic characteristics of cement, does not change with the environment for use of cement, accurately tests its numerical value and has main meaning for the fundamental characteristics of studying cement.Many for many years researchers have developed a large amount of modifying devices and method exploring effective easy method of testing around fluid-discharge therapy.Such as, earlier cement slurry is put in the little flexible glue bottle, again the flexible glue bottle is put in the wide-necked bottle, produce friction force so that avoid slurry sclerosis back directly to contact and then influence the drawback of test result with the bottle wall, this method test error is greatly and operating difficulties; First moulding hardening of cement body is also arranged, then hardenite is sealed, hardenite after will sealing is again put in the test bottle, this method can be selected different water cement ratio, but what obtain is macroscopical volume change of certain volume hardening of cement body, cannot be as chemical shrinkage, and missed the presclerotic volume change of cement slurry, and cement is bigger in during this period of time chemical shrinkage amount.All in all, various improving one's methods all is to adopt static cement slurry to test, so can't allow the complete aquation of cement, resulting is the part chemical shrinkage of cement under various hydrated environment conditions, and its test value and theoretical value differ bigger.
Summary of the invention
The method of testing and the proving installation that the object of the present invention is to provide a kind of chemistry of cement to shrink.
The method of testing that the chemistry of cement that the present invention proposes shrinks, concrete steps are as follows.
With stainless shot 4 in cement sample to be measured is put into pycnometer 2, the frosted bottleneck of pycnometer 2 is injected in the lower end of buret 1 and seal with encapsulant, before inserting pycnometer 2, be coated with one deck butter or vaseline at the frosted bottle mouth position, in pycnometer 2, be full of the full scale of water to buret 1, on the water surface, drip 1 drop of liquid paraffin and divide evaporation to prevent water, pycnometer 2 is placed on the magnetic stirring apparatus 3, opening magnetic stirring apparatus 3 makes stainless shot 4 drive the cement slurry rotation in pycnometer 2, according to the chemical shrinkage amount of the record of the level change in the buret 1 cement slurry, suspend magnetic stirring apparatus when measuring so that make liquid level stabilizing and be convenient to observation at different time at every turn.
The proving installation of the method for testing that the enforcement chemistry of cement that the present invention proposes shrinks, form by buret 1, pycnometer 2, magnetic stirring apparatus 3 and stainless shot 4, insert in the pycnometer 2 buret 1 lower end, buret 1 adopts the encapsulant sealing with the frosted bottleneck junction of pycnometer 2, stainless shot 4 is positioned at pycnometer 2, and pycnometer 2 is positioned at magnetic stirring apparatus 3 tops.
Among the present invention, the range of described buret 1 is generally 5ml, and minimum scale is 0.05ml, and the buret port outer of injecting pycnometer 2 frosted bottlenecks is through frosted.
Among the present invention, the capacity of described pycnometer 2 is generally 50ml-200ml.
Among the present invention, described stainless shot 4 is generally 3-5, and size can be identical or different, and diameter range is 3mm-8mm.
Among the present invention, the used encapsulant in the frosted bottleneck junction of described buret 1 and pycnometer 2 can be paraffin or other tackifier.
Beneficial effect of the present invention:
Adopt the inventive method and the method that tradition is put into static test in the vial with grout to do the contrast experiment, adopt the test value of the inventive method to be significantly higher than the classic method test value, more approaching general chemical shrinkage theoretical value.
Description of drawings
Fig. 1 is the structural representation that the present invention adopts.
Fig. 2 be in different hydration ages, two kinds of test results adopting classic method and the inventive method to obtain.Wherein, (a) being 0 to 350h chemical shrinkage rate curve, (b) is 0 to 12h chemical shrinkage rate curve.Chemical shrinkage rate and the time relation curve of curve A for adopting the inventive method to record, chemical shrinkage rate and the time relation curve of curve B for adopting classic method to record.
Number in the figure: 1 is buret, and 2 is pycnometer, and 3 is magnetic stirring apparatus, and 4 is stainless shot.
Embodiment
Further specify the present invention below by embodiment, but be not limited to content of the present invention.
(1) gets 50g cement and put in the pycnometer 2, shake pycnometer behind the water about adding 50g, cement is stirred with stainless shot 4 form cement slurries with stainless shot 4.
(2) smear one deck butter at the end outer frosted mouth place of buret 1, the end that will smear butter then injects the proportion bottleneck, with the candle of lighting is sealed with wax tightly in the buret 1 and the junction of pycnometer 2 again.
(3) to pycnometer, be filled to the full scale of buret 1 from the other end of buret 1, drip then on the water liquid level of a drop of liquid paraffin in buret to prevent that water from dividing evaporation.
(4) device is placed in 20 ℃ the thermostatic curing chamber, unlatching magnetic stirring apparatus 3 makes stainless shot 4 drive the cement slurry rotation in pycnometer 2 and picks up counting, according to the different hydrated cementitious length of time, change the chemical shrinkage rule of observing cement slurry by the liquid level scale value in the buret 1.
(5) begin generally should in 10min, finish from adding water more than to the operation of opening magnetic stirring apparatus and the timing.
(1) according to the chemical shrinkage value of the operational testing 50g cement of embodiment 1, finish the volume of test back test cement, the amount of contraction of day part test is converted into volumetric shrinkage, with time is abscissa axis, with the chemical shrinkage rate is axis of ordinates, make the curve of time and corresponding chemical shrinkage rate, be designated as A.
(2) adopt classic method to do the chemical shrinkage test of identical cement, being about to 50g cement packs in the pycnometer, the water that adds about 50g stirs, be connected with pycnometer and seal with wax tight with the buret that was coated with butter, be filled to the buret full scale then, drip a drop of liquid paraffin at last at liquid level and pick up counting, add water to operation between picking up counting and be controlled at 10min equally and finish with interior.Finishing the volume of test back test cement hardenite, the amount of contraction of day part test is converted into volumetric shrinkage, is abscissa axis with time, is axis of ordinates with the chemical shrinkage rate, makes the curve of time and corresponding chemical shrinkage numerical value then, is designated as B.
According to two kinds of test results do time-chemical shrinkage rate curve such as accompanying drawing 2.
The contrast of curve A and B as can be seen from accompanying drawing 2, the final volume shrinkage factor of the inventive method test is near 9%, the shrinkage factor that is higher than the classic method test far away, the test value of two kinds of methods is comparatively approaching before hydrated cementitious 2h, thereafter the test result of the inventive method begins to be higher than classic method, increasing degree within 24h is increasing, and the shrinkage factor difference in change of two kinds of methods is apart from just reducing gradually after 3 days.The test result of the inventive method is more near general theory chemical shrinkage value.
Claims (6)
1. the chemistry of cement method of testing of shrinking is characterized in that concrete steps are as follows:
With stainless shot (4) in cement sample to be measured is put into pycnometer (2), the frosted bottleneck of pycnometer (2) is injected in the lower end of buret (1) and seal with encapsulant, be coated with one deck butter or vaseline at the frosted bottle mouth position before at insertion pycnometer (2), in pycnometer (2), be full of the full scale of water to buret (1), on the water surface, drip 1 drop of liquid paraffin and divide evaporation to prevent water, pycnometer (2) is placed on the magnetic stirring apparatus (3), opening magnetic stirring apparatus (3) makes stainless shot (4) drive the cement slurry rotation in pycnometer (2), according to the chemical shrinkage amount of the record of the level change in the buret (1) cement slurry, suspend magnetic stirring apparatus when measuring so that make liquid level stabilizing and be convenient to observation at different time at every turn.
2. proving installation of implementing the method for testing that a kind of chemistry of cement as claimed in claim 1 shrinks, it is characterized in that forming by buret (1), pycnometer (2), magnetic stirring apparatus (3) and stainless shot (4), insert in the pycnometer (2) buret (1) lower end, buret (1) adopts the encapsulant sealing with the frosted bottleneck junction of pycnometer (2), stainless shot (4) is positioned at pycnometer (2), and pycnometer (2) is positioned at magnetic stirring apparatus (3) top.
3. proving installation as claimed in claim 2, the range that it is characterized in that described buret (1) is 5ml, and minimum scale is 0.05ml, and buret (1) the port outer of injecting pycnometer (2) frosted bottleneck is through frosted.
4. proving installation as claimed in claim 2, the capacity that it is characterized in that described pycnometer (2) is 50ml-200ml.
5. proving installation as claimed in claim 2 is characterized in that described stainless shot (4) is 3-5, and size is identical or different, and diameter range is 3mm-8mm.
6. proving installation as claimed in claim 2 is characterized in that the used encapsulant in the described buret (1) and the frosted bottleneck junction of pycnometer (2) adopts paraffin or other tackifier.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100461280A CN101482487B (en) | 2009-02-12 | 2009-02-12 | Test method and test device for chemical contraction of cement |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100461280A CN101482487B (en) | 2009-02-12 | 2009-02-12 | Test method and test device for chemical contraction of cement |
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| Publication Number | Publication Date |
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| CN101482487A CN101482487A (en) | 2009-07-15 |
| CN101482487B true CN101482487B (en) | 2010-12-01 |
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| CN2009100461280A Expired - Fee Related CN101482487B (en) | 2009-02-12 | 2009-02-12 | Test method and test device for chemical contraction of cement |
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Families Citing this family (12)
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| CN104155410B (en) * | 2014-07-04 | 2015-12-02 | 中国石油天然气股份有限公司 | Oil washing efficiency testing device |
| CN104569361B (en) * | 2015-01-06 | 2016-01-20 | 同济大学 | A kind of chemical contraction of cement proving installation and method of testing |
| CN104792974B (en) * | 2015-03-27 | 2016-04-06 | 同济大学 | A kind of method adopting full-automatic real density instrument test water slurry body chemical shrinkage |
| CN105424887A (en) * | 2015-12-09 | 2016-03-23 | 中国石油天然气股份有限公司 | Method and device for measuring expansion rate of inorganic water shutoff agent |
| CN105823869A (en) * | 2016-05-20 | 2016-08-03 | 中国石油集团西部钻探工程有限公司 | High-accuracy durable type cement paste expansion rate testing device |
| CN107976227B (en) * | 2017-11-22 | 2020-01-03 | 山西大学 | Slurry solidification volume change online testing device and testing method thereof |
| KR102280182B1 (en) * | 2018-10-30 | 2021-07-22 | 가천대학교 산학협력단 | Method for testing chemical shrinkage of cementitious material |
| CN109342704B (en) * | 2018-12-07 | 2021-07-30 | 浙江大学宁波理工学院 | Method for continuously measuring chemical shrinkage of cement paste in non-contact manner |
| CN110161218A (en) * | 2019-04-30 | 2019-08-23 | 东南大学 | Method that is a kind of while measuring cement slurry chemical shrinkage amount Yu apparent volume variable quantity |
| CN111323567A (en) * | 2020-03-16 | 2020-06-23 | 同济大学 | Cement paste chemical shrinkage testing device and application thereof |
| CN111551468A (en) * | 2020-07-10 | 2020-08-18 | 中铁六局集团有限公司 | Shield tunnel synchronous grouting slurry performance detection device and detection method thereof |
| CN118130775B (en) * | 2024-05-07 | 2024-07-05 | 北京建筑大学 | Device and method for measuring chemical shrinkage of building solid waste regenerated powder |
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