CN105058565A - 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
- Publication number
- CN105058565A CN105058565A CN201510501606.8A CN201510501606A CN105058565A CN 105058565 A CN105058565 A CN 105058565A CN 201510501606 A CN201510501606 A CN 201510501606A CN 105058565 A CN105058565 A CN 105058565A
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- CN
- China
- Prior art keywords
- sample
- temperature
- sack
- sealing
- cement
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Classifications
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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
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 to method of testing materials field, particularly relate to the flexible encapsulated maintenance process of cement-based material under a kind of low hot environment.
Background technology
Curing in airtight condition is a kind of sample maintenance process conventional in cement-based material research.Desirable curing in airtight condition can completely cut off water between external environment and reaction system, gas transmission, therefore, is conducive to the reaction rule disclosing material self.In order to build a closed reaction environment, people attempted a variety of sample method for packing.Such as, sample is wrapped up with masking foil, with plastics valve bag sealed sample, by fresh paste implantation glass test tube and with material closed ends such as paraffin, or sample is poured in mould of plastics (as spool box), then with cement slurry or the gap between epoxy sealing mold lid and mould, etc.
Although said method is widely used, the problems wherein existed still have to be solved.(1) sealing effectiveness is poor.When using masking foil or valve bag packaged sample, if when curing time is longer or curing temperature is higher, originally and sample masking foil closely of fitting can part throw off, and valve bag clip chain is also easy to locally automatically open.In addition, the material of masking foil and valve bag itself is thinner, and obdurability is poor, and tensile strength and impact strength are all lower, if for encapsulating mortar, is easy to be scratched by sample or breakage in sample handling process.These factors all can cause sample dehydration or surface carbonation.(2) sample adapting to different size is difficult to.Traditional curing in airtight condition method is due to reasons such as encapsulating material capacity are little or intensity is low, and it is less or without the need to shaping sample generally can only to be used for sealing cement paste equal-volume.But mortar and concrete sample not only volume are comparatively large, and mostly all need in the metal die of given shape shaping, and therefore, conventional encapsulation materials is difficult to meet the demands in capacity, obdurability and sealing effectiveness etc.(3) complex operation.At present, adopt glass tube or the box-packed sample of film, then its termination is sealed, normal temperature curing in airtight condition can be realized.But the sample shaping by these two kinds of methods is elongated cylinder.In order to avoid cement slurry layering, need continuous rotary sample before setting and harden.This needs the special equipment processing rotating speed adjustable by automatic Rotary Machine or designed, designed to realize, and process is loaded down with trivial details.(4) thermal adaptability is poor.Valve bag, spool box are normally made up of the material such as polyethylene, polypropylene of individual layer, should not for a long time for high temperature or low temperature environment.Especially when curing temperature continue higher than 60oC or lower than 0oC after, the problems such as encapsulant is softening, brittle, distortion, aging, sealing nature opens are more obvious.
Summary of the invention
The object of this invention is to provide the flexible encapsulated maintenance process of cement-based material under a kind of low hot environment, it can reduce the mass loss of cement slurry in maintenance processes, is particluarly suitable for carrying out long-term curing in airtight condition to cement paste, mortar or concrete test block in the environment of less than 100 DEG C.
The flexible encapsulated maintenance process of cement-based material under the low hot environment that the present invention proposes, concrete steps are as follows:
(1) sample sack is made: according to the size of packaged sample and mould thereof, make sample with high-temperature resistant membrane
Bag, described high-temperature resistant membrane by polyester film, aluminium foil, nylon and polypropylene four layer material be composited;
(2) shaping: cement-based material and water to be mixed thoroughly in proportion as required, shaping in high-temperature resistance die, the material that described high-temperature resistance die adopts is cast iron or stainless steel;
(3) encapsulate: be exposed to outer area according to shaping rear sample, cutting one piece of high-temperature resistant membrane (material is identical with film used in step (1)) covers sample casting area as overlay film, to keep the flatness of sample surfaces, and reduce encapsulation before sample surfaces moisture scatter and disappear, then put it in step (1) gained sample sack, with high temperature sealing machine at 200-280 DEG C by its Heat Sealing, with being placed on maintenance in required temperature environment;
(4) form removal: after reaching striking time, cuts off sample sack edge, takes off the overlay film of sample surfaces, is separated by sample as early as possible with high-temperature resistance die;
(5) secondary encapsulation: the sample after form removal and overlay film are put back to sample sack rapidly, to reduce moisture loss, uses sealing machine again at 200-280 DEG C by its hot sealing, in required temperature environment, then continues maintenance to the predetermined length of time.For the long-age sample that curing temperature is higher, as the length of time exceedes trimestral sample more than 70 DEG C, the quality of its sample sack be made regular check on, have the sample sack of aging phenomenon, the sample sack that need more renew.
In the present invention, when sample is without the need to time shaping, can the suitable sample sack of quality manufactured size per sample, then directly pour deployed cement slurry into sample sack, carry out hot sealing with sealing machine at 200-280 DEG C, subsequently in required temperature environment maintenance to specifying the length of time.For the sample of long term high temperature environment maintenance, also to make regular check on the quality of its sample sack, have the sample sack of aging phenomenon, the sample sack that need more renew.
Compared with conventional sealing method, beneficial effect of the present invention is:
(1) good sealing effect.The sample sack adopting four layers of exotic material to be composited, effectively reduces reaction system and extraneous water_air exchange, and contributes to the obdurability improving sample sack; In sample sack encapsulation link, adopt high temperature sealing machine to be melted at sack edge, then good bond is made it to its pressurization, therefore, even if occur when high temperature (as 90 DEG C) maintenance rising during bag phenomenon, the edge of sample sack also can not be thrown off, and these measures effectively improve sealing effectiveness;
(2) little to sample size restriction.Due to user can per sample and the size of mould high-temperature resistant membrane is processed into voluntarily the sample sack of specific dimensions and shape, therefore, cement paste, mortar and concrete test block can carry out curing in airtight condition in this way;
(3) thermal adaptability is strong.Because the four-level membrane material forming sample sack has good heat resistance, therefore, constant temperature or the alternating temperature curing in airtight condition of common low hot environment (between-10 DEG C to 100 DEG C) all can realize;
(4) easy and simple to handle, cost is lower.Owing to adopting flexible high-temperature resistant membrane to make sample sack, only need carry out cutting to film, Heat Sealing can realize sample sealing.This makes the operating process such as sample sack making, form removal, encapsulation and replacing simple and easy to do.And compared with other encapsulating material such as glass, polytetrafluoroethylene (PTFE), cost is lower.
Detailed description of the invention
The present invention is further illustrated below by embodiment.Under embodiment 1. room temperature (20 DEG C), the hydration and hardening process of cement in research curing in airtight condition environment.Because sample needs test cube compression strength, therefore, use mould molding.Sample is prepared according to following steps:
(1) with reference to the size of clean slurry mould, high-temperature resistant membrane is made sample sack, bag length 28cm, width 21cm, one-sided flanging width 1cm;
(2) by water and cement according to 0.4 the ratio of mud mix, moulding by casting in cast iron die;
(3) cutting one piece of high-temperature resistant membrane (10cm × 8cm) covers sample casting area, then puts it into sample sack, and with high temperature sealing machine hot sealing sample sack, seal temperature is 230 DEG C, carries out maintenance subsequently in the curing box of 20 ± 1 DEG C;
(4) after 24h, from curing box, take out sample sack, cut off a lateral edges, take out sample fast, open overlay film and remove mould;
(5) sample after form removal and overlay film are put back to sample sack as early as possible, to reduce moisture loss, then use sealing machine at 230 DEG C of Heat Sealing sample sacks, then sample is put back in curing box and continue maintenance to the predetermined length of time.
After tested, after maintenance 100 days, the mass loss of sample is only 0.01%, and sealing effectiveness is good.
The hydration process of cement under embodiment 2. researching high-temperature environment, chooses 50 DEG C, 70 DEG C and 90 DEG C of three curing temperatures in test.Sample does not need to test intensity, therefore need not be shaping.Sample is prepared according to following steps:
(1) according to the quality of required sample, high-temperature resistant membrane is made sample sack, bag length 20cm, width 16cm, one-sided flanging width 1cm;
(2) by water and cement according to 0.4 the ratio of mud mix, slurry is respectively charged into three sample sacks;
(3) with sealing machine hot sealing sample sack, seal temperature is 250 DEG C, subsequently sample is put into respectively 50 ± 1 DEG C, 70 ± 1 DEG C and 90 ± 1 DEG C three high temperature constant temperature chamber maintenances extremely predetermined length of time.
After tested, after maintenance 100 days, in 50 DEG C, 70 DEG C and 90 DEG C of environment, the sample weight loss of curing in airtight condition is respectively 0.01%, 0.04% and 0.14%, and three sample sacks are all without damaged and aging phenomenon.This illustrates that the mass loss of sample increases slightly, but all in all, sealing effectiveness is still better along with curing temperature raises.
Claims (2)
1. the flexible encapsulated maintenance process of cement-based material under low hot environment, is characterized in that concrete steps are as follows:
(1) make sample sack: according to the size of packaged sample and mould thereof, make sample sack with high-temperature resistant membrane, described high-temperature resistant membrane by polyester film, aluminium foil, nylon and polypropylene four layer material be composited;
(2) shaping: cement-based material and water to be mixed thoroughly in proportion as required, shaping in high-temperature resistance die, the material that described high-temperature resistance die adopts is cast iron or stainless steel;
(3) encapsulate: be exposed to outer area according to shaping rear sample, cutting one piece of high-temperature resistant membrane is as overlay film, described high-temperature resistant membrane material is identical with film used in step (1), described overlay film covers sample casting area, to keep the flatness of sample surfaces, and reduce encapsulation before sample surfaces moisture scatter and disappear, then put it in the sample sack of step (1) gained, with high temperature sealing machine at 200-280 DEG C by its Heat Sealing, with being placed on maintenance in required temperature environment;
(4) form removal: after reaching striking time, cuts off sample sack edge, takes off the overlay film of sample surfaces, is separated by sample as early as possible with high-temperature resistance die;
(5) secondary encapsulation: the sample after form removal and overlay film are put back to sample sack rapidly, to reduce moisture loss, uses sealing machine again at 200-280 DEG C by its hot sealing, in required temperature environment, then continues maintenance to the predetermined length of time; For the long-age sample that curing temperature is higher, trimestral sample is exceeded for more than the 70 DEG C length of times, the quality of its sample sack be made regular check on; For the sample sack having aging phenomenon, the sample sack that need more renew.
2. maintenance process according to claim 1, it is characterized in that when sample is without the need to time shaping, the concrete grammar adopted is: the sample sack that quality manufactured size first is per sample suitable, then directly deployed cement slurry is poured into sample sack, carry out hot sealing with sealing machine at 200-280 DEG C, subsequently in required temperature environment maintenance to specifying the length of time; For the sample of long term high temperature environment maintenance, the quality of its sample sack also to be made regular check on; For the sample sack having aging phenomenon, the sample sack that need more renew.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510501606.8A 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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| CN201510501606.8A 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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| CN105058565A true CN105058565A (en) | 2015-11-18 |
| CN105058565B CN105058565B (en) | 2017-05-03 |
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Citations (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 |
| 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 |
| CN101525224A (en) * | 2009-03-27 | 2009-09-09 | 重庆大学 | High iron pulverized ash cement-based composite wave-absorbing material applied to buildings and preparation method thereof |
| JP4701453B2 (en) * | 2005-02-25 | 2011-06-15 | ケイミュー株式会社 | Method for producing inorganic molded body |
| 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 |
-
2015
- 2015-08-17 CN CN201510501606.8A patent/CN105058565B/en active Active
Patent Citations (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 |
| CN101525224A (en) * | 2009-03-27 | 2009-09-09 | 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 |
Non-Patent Citations (1)
| Title |
|---|
| 李克非: "不同养护条件下水泥基材料的孔隙结构", 《建筑材料学报》 * |
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