CN105058565B - Flexible sealed curing method for cement-based materials under low-high temperature environment - Google Patents
Flexible sealed curing method for cement-based materials under low-high temperature environment Download PDFInfo
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- CN105058565B CN105058565B CN201510501606.8A CN201510501606A CN105058565B CN 105058565 B CN105058565 B CN 105058565B CN 201510501606 A CN201510501606 A CN 201510501606A CN 105058565 B CN105058565 B CN 105058565B
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- sample
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- temperature
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- cement
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/247—Controlling the humidity during curing, setting or hardening
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Sampling And Sample Adjustment (AREA)
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Abstract
The invention relates to a flexible sealed curing method for cement-based materials under a low-high temperature environment. The flexible sealed curing method specifically comprises the steps that firstly, a high-temperature resisting film is used for manufacturing a sample bag of the specific dimension; secondly, the cement-based materials and water are evenly stirred according to a proportion and molded in a high-temperature resisting die; thirdly, a high-temperature resisting film is added and covers the surface of the sample, then the sample is put into the sample bag, hot-pressing sealing is carried out through a high-temperature sealing machine, and then the sample is put in the low-high temperature environment to be cured; fourthly, after demoulding time is reached, the edge of the sample bag is sheared off, the covering film on the surface of the sample is taken down, and demoulding is carried out; and fifthly, the demoulded sample and the covering film are put back to the sampling bag, hot-pressing sealing is carried out through the high-temperature sealing machine again, and curing continues to be carried out in the low-high temperature environment until a predetermined age is reached. If the sample does not need to be molded, blended slurry can be directly poured into the sample bag to be subjected to hot-pressing sealing through the high-temperature sealing machine, and curing is carried out in the low-high temperature environment until the predetermined age is reached. The curing method is good in sealing effect, wide in application range, easy, convenient and flexible to operate and low in cost.
Description
Technical field
The present invention relates under method of testing materials field, more particularly to a kind of low hot environment cement-based material it is flexible close
Close maintenance process.
Background technology
Curing in airtight condition is a kind of sample maintenance process commonly used in cement-based material research.Preferably curing in airtight condition can be every
Water, gas transmission absolutely between external environment and reaction system, therefore, be conducive to disclosing the reaction rule of material itself.In order to seek
The reaction environment of a closing is made, people attempted a variety of sample method for packing.For example, sample is wrapped up with masking foil, with modeling
Material valve bag sealed sample, by fresh paste implantation glass test tube and with the material closed end such as paraffin, or sample is poured into a mould
To mould of plastics（Such as spool box）In, then with the gap between cement slurry or epoxy sealing mold lid and mould,
Etc..
Although said method is widely used, problems present in it still have to be solved.（1）Sealing effectiveness
Difference.During using masking foil or valve bag packaged sample, if curing time is longer or during higher curing temperature, fits with sample originally
Closely masking foil can be disengaged partly, and valve bag clip chain is also easy to local and opens automatically.Additionally, masking foil and valve bag sheet
The material of body is relatively thin, and obdurability is poor, tensile strength and impact strength all than relatively low, if for encapsulating mortar, it is easy to quilt
Sample is scratched or the breakage in sample handling process.These factors can all cause sample dehydration or surface carbonation.（2）It is difficult to fit
Answer various sizes of sample.Traditional curing in airtight condition method because encapsulating material capacity is little or the low reason of intensity, it is general only
Can be used for sealing the sample that cement paste equal-volume is less or need not be molded.But, mortar and concrete sample not only volume
It is larger, and be required for being molded in the metal die of given shape mostly, therefore, conventional encapsulation materials are in capacity, obdurability
And the aspect such as sealing effectiveness is difficult to meet and requires.（3）It is cumbersome.At present, it is using glass tube or the box-packed sample of film then right
Its termination is sealed, it is possible to achieve normal temperature curing in airtight condition.But, the sample being molded with both approaches is elongated cylinder
Body.In order to avoid cement slurry layering, the continuous rotary sample before hardening is condensed is needed.This need by automatic Rotary Machine or
Designed, designed processes the adjustable special equipment of rotating speed to realize, process is loaded down with trivial details.（4）Thermal adaptability is poor.Valve bag, spool box lead to
It is often by made by the material such as polyethylene, polypropylene of individual layer, should not to be for a long time used for high temperature or low temperature environment.Especially when maintenance temperature
Degree persistently higher than 60 C or less than 0 C after, the problems such as encapsulant softens, brittle, deformation, aging, sealing nature open more
Substantially.
The content of the invention
It is an object of the invention to provide under a kind of low hot environment cement-based material flexible encapsulated maintenance process, it can
Reduce maintenance processes in cement slurry mass loss, be particluarly suitable in less than 100 DEG C of environment to cement paste, mortar or
Concrete test block carries out long-term curing in airtight condition.
The flexible encapsulated maintenance process of cement-based material, comprises the following steps that under low hot environment proposed by the present invention：
（1）Make sample sack：According to packaged sample and its size of mould, with high-temperature resistant membrane sample is made
Bag, the high-temperature resistant membrane is composited by polyester film, aluminium foil, nylon and the layer material of polypropylene four；
（2）Shaping：Cement-based material is mixed thoroughly in proportion with water as needed, is molded in high-temperature resistance die, it is described resistance to
The material that die material is adopted is cast iron or stainless steel；
（3）Encapsulation：According to sample exposure area outside, one piece of high-temperature resistant membrane of cutting after shaping（Material and step（1）
In film used it is identical）Sample casting area is covered as overlay film, to keep the flatness of sample surfaces, and sample before encapsulation is reduced
Scattering and disappearing for product surface moisture, then puts it into step（1）Gained sample sack in, with high temperature sealing machine 200-280 DEG C by its
Heat Sealing, conserves in the temperature environment needed for being subsequently placed at；
（4）Form removal：After reaching striking time, cut off sample sack edge, remove the overlay film of sample surfaces, as early as possible by sample and
High-temperature resistance die is separated；
（5）Secondary encapsulation：Sample and overlay film after form removal is put back to into rapidly sample sack, to reduce moisture loss, is used again
Sealing machine, by its hot sealing, then continues to conserve to predetermined age at 200-280 DEG C in required temperature environment.For foster
The higher long-age sample of shield temperature, age exceedes trimestral sample such as more than 70 DEG C, to make regular check on its sample sack
Quality, the sample sack for having aging phenomenon, the sample sack that need to more renew.
In the present invention, when sample need not be molded, can then will according to the suitable sample sack of the quality manufactured size of sample
Deployed cement slurry directly pours sample sack into, and hot sealing is carried out at 200-280 DEG C with sealing machine, subsequently in required temperature
Conserve to specified age in degree environment.For the sample of long term high temperature environment maintenance, the quality of its sample sack is also made regular check on,
There is the sample sack of aging phenomenon, the sample sack that need to more renew.
Compared with conventional sealing method, the beneficial effects of the present invention is：
（1）Good sealing effect.The sample sack being composited using four layers of exotic material, effectively reduce reaction system with
Extraneous water_air exchange, and it is favorably improved the obdurability of sample sack；Link is encapsulated in sample sack, will using high temperature sealing machine
Sack edge melts, and then it is pressurizeed and is allowed to good bond, therefore, even if in high temperature（Such as 90 DEG C）The bag that occurs rising during maintenance shows
As when, the edge of sample sack also cannot come off, and these measures effectively increase sealing effectiveness；
（2）Little is limited to sample size.Because user can be according to the size of sample and its mould by high-temperature resistant membrane
The sample sack of specific dimensions and shape is voluntarily processed into, therefore, cement paste, mortar and concrete test block can use this side
Method carries out curing in airtight condition；
（3）Thermal adaptability is strong.Because the four-level membrane material for constituting sample sack has preferable heat resistance, therefore, it is general
Lead to low hot environment（As between -10 DEG C to 100 DEG C）Constant temperature or alternating temperature curing in airtight condition be capable of achieving；
（4）Easy to operate, cost is relatively low.Due to making sample sack using flexible high-temperature resistant membrane, only film need to be entered
Row cutting, Heat Sealing are capable of achieving sample sealing.This causes the operating process such as sample sack making, form removal, encapsulation and replacing
It is simple and easy to do.And, compared with other encapsulating materials such as glass, polytetrafluoroethylene (PTFE), cost is lower.
Specific embodiment
The present invention is further illustrated below by embodiment.The room temperature of embodiment 1.（20℃）Under, study curing in airtight condition environment
The hydration and hardening process of middle cement.Because sample needs test cube compression strength, therefore, use mould molding.According to
Lower step prepares sample：
（1）With reference to the size of net slurry mould, high-temperature resistant membrane is made into sample sack, bag length 28cm, width 21cm, list
Side pressure hem width degree 1cm；
（2）Water and cement are well mixed according to 0.4 ratio of mud, the moulding by casting in cast iron die；
（3）One piece of high-temperature resistant membrane of cutting（10cm×8cm）Sample casting area is covered, sample sack is then put it into, is used
High temperature sealing machine hot sealing sample sack, seal temperature is 230 DEG C, is subsequently conserved in 20 ± 1 DEG C of curing box；
（4）After 24h, sample sack is taken out from curing box, cut off a lateral edges, quickly removed sample, open overlay film and tear open
Except mould；
（5）Sample and overlay film after form removal is put back to into as early as possible sample sack, to reduce moisture loss, then with sealing machine 230
DEG C Heat Sealing sample sack, then sample is put back in curing box continue to conserve to predetermined age.
Jing is tested, and afterwards the mass loss of sample is only 0.01%, and sealing effectiveness is good within 100 days for maintenance.
The hydration process of cement under the researching high-temperature environment of embodiment 2., chooses 50 DEG C, 70 DEG C and 90 DEG C three and supports in test
Shield temperature.Sample need not test intensity, therefore need not be molded.Sample is prepared according to following steps：
（1）According to the quality of required sample, high-temperature resistant membrane is made into sample sack, bag length 20cm, width 16cm, list
Side pressure hem width degree 1cm；
（2）Water and cement are well mixed according to 0.4 ratio of mud, slurry is respectively charged into three sample sacks；
（3）With sealing machine hot sealing sample sack, seal temperature is 250 DEG C, subsequently by sample be respectively put into 50 ± 1 DEG C,
Conserve to predetermined age in 70 ± 1 DEG C and 90 ± 1 DEG C of three high temperature constant temperature chambers.
Jing is tested, and afterwards the sample weight loss of curing in airtight condition is distinguished in 50 DEG C, 70 DEG C and 90 DEG C environment within 100 days for maintenance
For 0.01%, 0.04% and 0.14%, and, three sample sacks are without damaged and aging phenomenon.This explanation is with curing temperature liter
Height, the mass loss of sample is slightly increased, but all in all, sealing effectiveness is still preferable.
Claims (2)
1. under low hot environment cement-based material flexible encapsulated maintenance process, it is characterised in that comprise the following steps that：
（1）Make sample sack：According to packaged sample and its size of mould, sample sack is made with high-temperature resistant membrane, it is described
High-temperature resistant membrane is composited by polyester film, aluminium foil, nylon and the layer material of polypropylene four；
（2）Shaping：Cement-based material is mixed thoroughly in proportion with water as needed, is molded in high-temperature resistance die, the high temperature resistant
The material that mould is adopted is cast iron or stainless steel；
（3）Encapsulation：According to sample exposure area outside after shaping, one piece of high-temperature resistant membrane of cutting as overlay film, the resistance to height
Warm thin-film material and step（1）In film used it is identical, the overlay film covers sample casting area, to keep the smooth of sample surfaces
Degree, and reduce encapsulation before sample surfaces moisture scatter and disappear, then put it into step（1）In the sample sack of gained, high temperature is used
Sealing machine, by its Heat Sealing, is conserved at 200-280 DEG C in the temperature environment needed for being subsequently placed at；
（4）Form removal：After reaching striking time, sample sack edge is cut off, remove the overlay film of sample surfaces, as early as possible by sample and Nai Gao
Warm mould is separated；
（5）Secondary encapsulation：Sample and overlay film after form removal is put back to into rapidly sample sack, to reduce moisture loss, again with sealing
Machine, by its hot sealing, then continues to conserve to predetermined age at 200-280 DEG C in required temperature environment；For 70 DEG C with
Upper age exceedes trimestral sample, to make regular check on the quality of its sample sack；For the sample sack for having aging phenomenon, need to change
New sample sack.
2. maintenance process according to claim 1, it is characterised in that when sample need not be molded, the concrete grammar of employing
For：First according to the sample sack that the quality manufactured size of sample is suitable, then deployed cement slurry is directly poured into sample
Bag, hot sealing is carried out with sealing machine at 200-280 DEG C, is subsequently conserved to specified age in required temperature environment；For
The sample of long term high temperature environment maintenance, will also make regular check on the quality of its sample sack；For the sample sack for having aging phenomenon, need more
The sample sack for renewing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510501606.8A CN105058565B (en) | 2015-08-17 | 2015-08-17 | Flexible sealed curing method for cement-based materials under low-high temperature environment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510501606.8A CN105058565B (en) | 2015-08-17 | 2015-08-17 | Flexible sealed curing method for cement-based materials under low-high temperature environment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN105058565A CN105058565A (en) | 2015-11-18 |
| CN105058565B true CN105058565B (en) | 2017-05-03 |
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| CN201510501606.8A Active CN105058565B (en) | 2015-08-17 | 2015-08-17 | Flexible sealed curing method for cement-based materials under low-high temperature environment |
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Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2704465Y (en) * | 2004-04-15 | 2005-06-15 | 宁小林 | Water-retaining curing film with cement gel structure |
| JP4701453B2 (en) * | 2005-02-25 | 2011-06-15 | ケイミュー株式会社 | Method for producing inorganic molded body |
| CN101423369A (en) * | 2008-11-13 | 2009-05-06 | 贵州开磷（集团）有限责任公司 | Low-temperature maintenance method of gypsum steam brick |
| CN101525224B (en) * | 2009-03-27 | 2012-07-04 | 重庆大学 | High iron pulverized ash cement-based composite wave-absorbing material applied to buildings and preparation method thereof |
| CN102501309A (en) * | 2011-10-28 | 2012-06-20 | 创斯达（南通）机电有限公司 | High-temperature dry-heat maintenance process for cement based composite materials of bank financial equipment |
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