CN102116091A - Early fog curing method of cement-based materials - Google Patents
Early fog curing method of cement-based materials Download PDFInfo
- Publication number
- CN102116091A CN102116091A CN 201110003003 CN201110003003A CN102116091A CN 102116091 A CN102116091 A CN 102116091A CN 201110003003 CN201110003003 CN 201110003003 CN 201110003003 A CN201110003003 A CN 201110003003A CN 102116091 A CN102116091 A CN 102116091A
- Authority
- CN
- China
- Prior art keywords
- cement
- based material
- negative pressure
- capillary negative
- concrete
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Devices For Post-Treatments, Processing, Supply, Discharge, And Other Processes (AREA)
Abstract
The invention relates to an early fog curing method of cement-based materials. By adopting the method, not only are the complex procedures of early curing in stages simplified, but also optimal hydrated environment is provided for the early concrete surface layer to achieve the optimal curing effect. The method is characterized in that fog is sprayed on the surfaces of the cement-based materials to ensure the negative pressure of the pores on the fresh surface layers of the cement-based materials to be 0-2kPa until the cement-based materials are demoulded; the sprayed fog is fog water or vacuum distillation agent solution; when the negative pressure of the capillary tubes on the surface layers of the cement-based materials is 1.8-2.0kPa, fog spraying is begun; and when the negative pressure of the capillary tubes on the surface layers of the cement-based materials restores to 0.0-0.2kPa, fog spraying is stopped. The method has the following beneficial effects: early fog curing of the fresh concrete is carried out from pouring of the concrete and curing lasts until the concrete is demoulded; and the whole operation process is simple, the capability of the concrete structure in resisting permeation of outside harmful media is improved and the durability of the concrete is obviously improved.
Description
Technical field
The present invention relates to a kind of method for maintaining cement-based material in early stages, be applicable to that the job site is exposed to cement-based grouting material under the natural conditions, high performance concrete, self-compacting concrete, and be exposed to concrete under the harsh dry environment, begin to belong to the concrete construction technology field from building moulding until the stage of the sclerosis demoulding.
Background technology
" maintenance " is the very important program in the cement-based material work progress, is described to provide cement to continue required enough water and the heat of aquation usually, and makes cement realize the process of hardening within a certain period of time.With the cement-based material of cement as main cementitious material, the generation of its main performance all depends on the aquation of cement essential mineral, and this hydration process must satisfy certain temperature and humidity condition.This condition must be finished by special measure at the construction field (site), i.e. maintenance.Maintenance is to hardening cement base material inside and surface property, and the ability as intensity, permeability, abrasion resistance, volume stability and opposing freeze-thaw damage and deicer salts erosion all can produce remarkable influence,
The period definition of maintenance for from initial build, pave, vibrate and finishing until this one-period of the cement-based material performance that obtains requiring, wherein early curing is meant the maintenance that is poured between the demoulding.In the cement-based material work progress, traditional maintenance is a single process, usually cement-based material build or finishing after implement, for ordinary Portland cement sill under the conventional environment, because its water evaporates speed is relatively slow, this curing procedure is more reasonable, and is easy to implement.Yet, for flourish high performance cement-based material since the recent two decades, as pumping of concrete, self-compacting concrete, high-strength concrete or the like, the popular feature of these cement-based materials have been admixtures high efficiency water reducing agent and active fine mineral admixture, the cement-based material degree of mobilization is big, and moisture is easily from surface evaporation; And the bleeding rate of cement-based material is lower, moisture evaporated is difficult to obtain replenish timely, therefore cement-based material is very easy to after building, and peeling, cracking took place in the past in final set, can influence the useful life longevity and the application life of cement-based material under the Service Environment when serious.Traditional single curing procedure is built later cement-based material many places in harsh drought environments such as strong wind, illumination especially for the Northwest of China, just adopts traditional ordinary Portland cement sill to build at last, also the problem of the early stage cracking of ubiquity.
The concrete curing guide that ACI proposes is pointed out, the concrete maintenance explanation that great majority are newly built all is recommended in a kind of method of or several combinations, and must take maintenance in the specific period, and define early curing, maintenance in mid-term and later stage maintenance three phases.Yet this guide does not provide the science criterion of specific period.Only rely on people from job site to be perusal, depend on workman's experience.For example excreting water phenomenon can directly be observed with eyes.Yet when evaporation rate during greater than bleeding speed, the state on cement-based material surface causes misunderstanding easily, seems initial set as the surface, but the internal water cement-based material also is in plastic state.This misunderstanding can make people take wrong maintenance means, and the final performance of cement-based material is caused adverse effect.Patent 200910184610.0 discloses a kind of method for maintaining cement-based material in early stages stage by stage based on the test of hole negative pressure, realized automatic division by building continuous monitoring that moulding begins the early stage hole negative pressure of cement-based material certainly to the maintenance stage, and provided the maintenance measure of different phase, realized the technological progress of early curing.Yet, in actual mechanical process, still have certain problem.Owing to building in early days, a lot of procedures are arranged in the concrete construction, and the concrete pouring bin face is bigger, in the process of building, build in the ban that part concrete surface layer hole negative pressure reaches certain threshold value and after the constructor sends signal, the workman builds operation owing to also being in, and necessary maintenance measure is taked in the work of often can't or be unwilling to stop at hand; And administrative staff also are unwilling to increase extraly special workman and realize therefore getting a desired effect stage by stage operation.
Summary of the invention
The invention provides the early stage fog curing method of a kind of cement-based material, not only simplified early curing complicated procedures stage by stage, and for early stage concrete surface layer provides best hydrated environment, to reach best maintenance effect.
Described method for maintaining cement-based material in early stages is:
At the cement-based material surface spray, making the pore negative pressure of newly watering the cement-based material top layer is 0-2kPa, and till the cement-based material demoulding, described spraying is meant sprays vaporific water or evaporation-reducing agent solution.
Described cement-based material top layer surpasses crack of surface layer phenomenon that internal moisture to the speed of top layer migration cause with interior part because the reason of plastic cracking is the evaporation rate of top layer moisture for distance cement-based material case depth 10mm.Because the evaporation rate of internal moisture is far smaller than the evaporation rate of top layer moisture, if the ceramic head length of embedment is too dark, water evaporates situation that just can not the perception top layer does not reach by the top layer negative pressure and carries out maintenance, controls the effect of plastic cracking.
When cement-based material top layer capillary negative pressure reaches 1.8-2.0kPa, begin spraying; When cement-based material top layer capillary negative pressure returns to 0.0-0.2kPa, stop spraying.
Described capillary negative pressure can adopt known method to test.CN200610038805.0 discloses the method for a kind of early capillary negative pressure automatic detector for concrete and test.The present invention can adopt the method for testing and the principle of above-mentioned patent, utilizes same or similar installation carries out the test of capillary negative pressure.Use the capillary negative pressure on capillary negative pressure automatic detector test water cement-based material top layer, described capillary negative pressure automatic detector comprises pressure sensor, probe, capillary negative pressure data collecting instrument, the probe bottom is equipped with ceramic head, there is micro pores ceramic head surface and inside, the aperture of described micro-pore is 0.01-0.035 μ m, and pressure sensor one end is connected with probe; The probe internal pressure that pressure sensor records is analyzed and is handled through the capillary negative pressure data collecting instrument, and the method for described test water cement-based material capillary negative pressure comprises the steps:
A. fills with water in probe makes the ceramic head water-filling saturated, the initial pressure P0 in the test probe;
B. the ceramic head of probe bottom is inserted the cement-based material top layer, the pressure P 1 in the test probe, the difference of P1 and P0 is the capillary negative pressure on cement-based material top layer.
Described ceramic head external diameter is not more than 6mm, and length is 3-5mm, when ceramic head inserts cement-based material, is placed horizontally in the cement-based material.
The ceramic head upper surface places in the depth bounds of cement-based material 1-5mm.
The average pore size of micro-pore is 0.02 μ m in the ceramic head.
The precision of described capillary negative pressure automatic detector is not less than ± 1kPa.
In order to make the ceramic head water-filling saturated, ceramic head must soak above 24 hours in air free water (can adopt common tap water is heated to boiling after, continue heating again and surpass cooling in 20 minutes) in advance before use.Probe can be made up of discharge, ceramic head, pipe close, and it is the flexible plastic tube of 2-4mm that discharge adopts external diameter, and corresponding with the diameter of ceramic head.Ceramic head and plastic flexible pipe directly bonding must closely must not leak gas.Plastic flexible pipe need be full of water before imbedding ceramic head, and the jam-pack pipe close, can not leak gas.
The effect of probe is to respond to the energy state of cement paste, cement mortar or concrete surface moisture under exposure condition, and the pressure that pressure sensor accurately tests out probe changes, for the startup of atomization mechanism provides the signal foundation.
As preferred version, adopt the capillary negative pressure data collecting instrument and the atomization mechanism that link to each other, the capillary negative pressure data collecting instrument is according to the capillary negative pressure on cement-based material top layer, and the control atomization mechanism is sprayed.
The capillary negative pressure data collecting instrument can adopt various known data transfer mode of the prior art to link to each other with atomization mechanism, such as adopting wireless monitor system, also can be described in CN200610038805.0, line monitoring system (passing through cable transmission) to be arranged.
As optimization for spray pattern, in order to reduce the startup frequency of pulverizer, evaporation-reducing agent solution that can spray form.
Be applied to the concrete early curing for example with the present invention, particular content of the present invention comprises:
At first, before the construction casting cement-based material, pre-buried probe.The layout of probe can be arranged according to the order of concreting storehouse face, from the position of building at first, is separated by above the position in storehouse of 1h in the storehouse face time of building, and arranges 1-2 pottery probe as much as possible.
Behind the concreting, test concrete surface layer capillary negative pressure according to the concrete surface layer capillary negative pressure, carries out fog curing to concrete.
As optimization for spray pattern, in order to reduce the startup frequency of pulverizer, evaporation-reducing agent solution that can spray form.
From concreting, adopt such fog curing mode, implement the early stage fog curing of newly placed concrete, the fog curing time remaining is till the concrete demoulding.The whole operation process is simple, and both having avoided the division of early stage maintenance processes stage by stage and having built needs in the process to take the maintenance measure artificially, has simplified construction sequence; And effectively avoided outside drying, inner self-desiccation to cause shrinkage stress, effectively reduce even avoid the generation of early crack; And provide the hydrated environment of approximate 100% relative humidity for the early concrete top layer, promoted the concrete early hydration in top layer, strengthen the concrete physical arrangement in top layer, improved concrete structure and resisted the ability that extraneous hazardous medium permeates, significantly improved concrete durability.This method is applicable to that the job site is exposed to high performance concrete under the natural conditions, self-compacting concrete, and is exposed to the concrete under the harsh dry environment; This method also goes for cement mortar, this class cement-based material of cement paste.
Description of drawings
Fig. 1 is that the system of embodiment 1 constitutes schematic diagram.
Fig. 2 is the influence of early curing mode to carbonation depth.
Fig. 3 is the influence of early curing mode to electric flux.
The specific embodiment
The capillary negative pressure automatic detector that present embodiment adopts comprises pressure sensor 1, probe, capillary negative pressure data collecting instrument 5, probe is by ceramic head 2, discharge 3 and pipe close 4 are formed, the probe bottom is equipped with ceramic head 2, be full of water in the discharge 3, the top is provided with pipe close 4, aforementioned ceramic head 2 internal diameters are 2mm, external diameter is 6mm, long 5mm, there is micro pores surface and inside, the average pore size of described micro-pore is 0.02 μ m, discharge 3 is made by transparent plastic flexible pipe, external diameter is 2mm, and discharge 3 tops are provided with pipe close 4, and pressure sensor 1 is installed in the pipe close 4, pressure sensor 1 other end capillary negative pressure data collecting instrument 5 of ining succession, the data that record are analyzed and are handled through capillary negative pressure data collecting instrument 5.Use the pre-ceramic head in air free water, to soak in advance and surpass 24 hours, saturated with water-filling.The saturated ceramic head of horizontal pre-buried water-filling in just building the concrete that moulding finishes makes the upper surface of ceramic head be positioned at the following 2mm of concrete surface place.
The setting drawing of present embodiment is as follows:
As shown in Figure 1, capillary negative pressure data collecting instrument 5 is made up of singlechip computer system, comprise interconnected AD converter 6, single-chip microcomputer central processing unit 7, the pressure sensor 1 of capillary negative pressure automatic detector and data collecting instrument 5 link to each other through cable, signal by the pressure sensor induction is transported to AD converter through cable, through the AD converter analog-to-digital conversion is numerical signal and the central processing unit that is sent to single-chip microcomputer, the single-chip microcomputer central processing unit links to each other through cable with the motor of pulverizer, the single-chip microcomputer central processing unit mainly plays the acquisition time cycle of control sensor, threshold value is set, and the function of the motor of pulverizer is differentiated and controlled to signal.Data collecting instrument links to each other with the computer serial ports, and being provided with of acquisition time cycle and threshold value can directly be provided with on data collecting instrument, also can be provided with on computers by connecting computer.
Concrete step comprises:
At first, before the construction casting cement-based material, pre-buried probe.The layout of probe can be arranged according to the order of concreting storehouse face, from the position of building at first, is separated by above the position in storehouse of 1h in the storehouse face time of building, and arranges 1-2 pottery probe as much as possible.
Behind the concreting, at first to the zero clearing of capillary negative pressure data collecting instrument, setting program inside data collecting instrument:
1) sets in advance the threshold value A and the B of capillary negative pressure, the size of threshold value and the sensitivity of capillary negative pressure testing arrangement and the size of probe, the pre-buried degree of depth are relevant, the result of study in early stage according to the present invention, adopt device of the present invention, the upper limit A of threshold value can be set to 2.0kPa, and the B that rolls off the production line of threshold value can be set to 0.1kPa;
2) set in advance the sampling time, (sample frequency t can be 1min, 2min, 5min every time t ... set as required) test capillary negative pressure Pi.
3) capillary negative pressure Pi signal to A/D converter, and is numerical signal through analog-to-digital conversion with analog signal conversion through cable transmission, and is transported to central processing unit.
4) the central processing unit logarithm value signal of the data collecting instrument of capillary negative pressure is differentiated and is handled, and when Pi 〉=A, starts the motor of pulverizer, begins spraying; When Pi≤B, stop the motor of pulverizer, stop spraying.
With reference to " concrete structure durability design and construction guide " and ASTM C 1579-06 steel fibrous concrete plastic cracking appraisal procedure, sample dimensions 900mm * 620mm * 80mm, the mould frame is just made of the groove of 63mm * 40mm * 6.3mm, mould four limits and base plate pass through bolt together, to improve the rigidity of mould.On each limit of mould, weld simultaneously two row totally 14 Φ 10 * 100mm bolts stretch to the ground tackle inboard, two row bolts interlaced, the concrete of being convenient to build can be filled closely knit, when the concrete flat slab of building shrinks, will be subjected to the constraint of bolt all around.On base plate, place simultaneously restraint device, described restraint device is that (the steel plate bending that is 1.2mm by a thickness according to the regulation of ASTM C1579-06 forms for steel plate with three stress salient ribs, sectional view is seen Fig. 3, wherein all sizes are all in mm), because the rigid constraint of restraint device, concrete sedimentation will be at the highest position created fractures of centre in the place of projection.Base plate adopts the high-density plate that is not less than 20mm, base plate upper berth polyvinyl chloride film separation layer.Mould is as the part of experimental rig, during test and test specimen connect together.
What pulverizer used is spray water.
Durability evaluation is mainly taked electric flux method and high-speed carbonation test method.Electric flux test compact dimensions is that diameter is that 101mm highly is the concrete sample of 200mm, gets the thick test specimen cutting-out of top layer 25mm and is used for test.Why selecting the thickness of top layer 25mm, mainly is to consider that the top layer concrete is subjected to the influence of curing condition bigger.The electric flux test is carried out with reference to ASTM C 1202-97, but test voltage is reduced to 30v by 60v.The sample dimensions of high-speed carbonation test is 100mm * 100mm * 300mm, behind the dry 3d, will all seal to carry out carbonization test with paraffin by its lap except exposure in 70 ℃ of baking ovens earlier before the carbonization.
Embodiment
Water-binder ratio is 0.32, and gel material content is 520kg/m
3, silicon ash volume is 10%, sand coarse aggregate ratio is 0.40.The saturated ceramic head 2 of horizontal pre-buried water-filling in just building the concrete that moulding finishes makes the upper surface of ceramic head 2 be positioned at the following 2mm of concrete surface place.Whole test specimen is exposed to 30 ± 2 ℃ of natural environments, and 35 ± 5%, under the wind speed 3.5m/s laboratory test condition of test specimen center.
At first in the plastic cracking die trial, build the concrete that stirs, one group of not maintenance, one group adopt auto spraying maintenance process of the present invention (A=2kPa, B=0kPa).Test the situation of its plastic cracking, result of the test is as shown in the table:
Table 1 early curing method is to the influence of plastic cracking
In life test, directly be exposed to 30 ± 2 ℃ of natural environments after benchmark test specimen (CN) moulding, 35 ± 5%, 1d under the wind speed 3.5m/s laboratory test condition of test specimen center; Adopt auto spraying maintenance of the present invention (A=2kPa B=0kPa) also directly is exposed to 30 ± 2 ℃ of natural environments after test specimen (AF) moulding, 35 ± 5%, 1d under the wind speed 3.5m/s laboratory test condition of test specimen center; Be exposed to 30 ± 2 ℃ of natural environments after the 3rd group of test specimen (FP) moulding, 35 ± 5%, under the wind speed 3.5m/s laboratory test condition of test specimen center, when top layer hole negative pressure test value equals 1.8kPa, surface spray once, when hole negative pressure test value increases once more, and when reaching 2kPa, adopt the PVC plastic sheeting to 1d; Be exposed to 30 ± 2 ℃ of natural environments after the 4th group of test specimen (FW) moulding, 35 ± 5%, under the wind speed 3.5m/s laboratory test condition of test specimen center, when hole negative pressure test value during less than 2kPa, surface spray once, when hole negative pressure test value increases once more and reaches 2kPa, surface watering, when the hole negative pressure increased once more and reaches 10kPa, surperficial retaining 5mm was deep to 1d.Its electric flux of test and carbonation depth after the test specimen 1d demoulding of adopting above-mentioned four kinds of maintenance modes.Result of the test is as shown below:
By the result of the test of table 1 and Fig. 2, Fig. 3 as seen, the early curing method of being invented has not only effectively been avoided early stage cracking, and operation sequence is simple, does not need the division stage in early days; What is more important, this maintenance method have been improved the ability of top layer concrete opposing medium osmosis effectively.
Claims (10)
1. the early stage fog curing method of cement-based material, it is characterized in that at the cement-based material surface spray, making the pore negative pressure of newly watering the cement-based material top layer is 0-2kPa, till the cement-based material demoulding, described spraying is meant sprays vaporific water or evaporation-reducing agent solution.
2. the early stage fog curing method of cement-based material as claimed in claim 1 is characterized in that, described cement-based material top layer is with interior part apart from cement-based material case depth 10mm.
3. the early stage fog curing method of cement-based material as claimed in claim 1 is characterized in that, when cement-based material top layer capillary negative pressure reaches 1.8-2.0kP, begins spraying; When cement-based material top layer capillary negative pressure returns to 0-0.2kPa, stop spraying.
4. method for maintaining cement-based material in early stages as claimed in claim 3, it is characterized in that, adopt the capillary negative pressure data collecting instrument and the atomization mechanism that link to each other, the capillary negative pressure data collecting instrument is according to the capillary negative pressure on cement-based material top layer, and the control atomization mechanism is sprayed.
5. method for maintaining cement-based material in early stages as claimed in claim 4, it is characterized in that using the capillary negative pressure on capillary negative pressure automatic detector test water cement-based material top layer, described capillary negative pressure automatic detector comprises pressure sensor, probe, capillary negative pressure data collecting instrument, the probe bottom is equipped with ceramic head, there is micro pores ceramic head surface and inside, the aperture of described micro-pore is 0.01-0.035 μ m, and pressure sensor one end is connected with probe; The probe internal pressure that pressure sensor records is analyzed and is handled through the capillary negative pressure data collecting instrument, and the method for described test water cement-based material capillary negative pressure comprises the steps:
A. fills with water in probe makes the ceramic head water-filling saturated, the initial pressure P in the test probe
0
B. the ceramic head of probe bottom is inserted the cement-based material top layer, the pressure P in the test probe
1, P
1With P
0Difference be the capillary negative pressure on cement-based material top layer,
The capillary negative pressure data collecting instrument sends control signal according to the capillary negative pressure on cement-based material top layer to atomization mechanism.
6. method for maintaining cement-based material in early stages as claimed in claim 5 is characterized in that described ceramic head external diameter is not more than 6mm, and length is 3-5mm, when ceramic head inserts cement-based material, is placed horizontally in the cement-based material.
7. method for maintaining cement-based material in early stages as claimed in claim 6 is characterized in that the ceramic head upper surface places in the depth bounds of cement-based material 1-5mm.
8. method for maintaining cement-based material in early stages as claimed in claim 5, the average pore size that it is characterized in that micro-pore in the ceramic head is 0.02um.
9. method for maintaining cement-based material in early stages as claimed in claim 5 is characterized in that described probe comprises discharge and ceramic head, and ceramic head is fixed in the discharge bottom, and the discharge external diameter is 2-4mm, and pressure sensor one end is connected with discharge.
10. method for maintaining cement-based material in early stages as claimed in claim 5 is characterized in that the precision of described capillary negative pressure automatic detector is not less than ± 1kPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110003003 CN102116091A (en) | 2011-01-07 | 2011-01-07 | Early fog curing method of cement-based materials |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201110003003 CN102116091A (en) | 2011-01-07 | 2011-01-07 | Early fog curing method of cement-based materials |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102116091A true CN102116091A (en) | 2011-07-06 |
Family
ID=44215003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201110003003 Pending CN102116091A (en) | 2011-01-07 | 2011-01-07 | Early fog curing method of cement-based materials |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102116091A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638613A (en) * | 2021-08-20 | 2021-11-12 | 上海建工集团股份有限公司 | Intelligent maintenance system and method for mass concrete of foundation slab |
| CN113695110A (en) * | 2021-08-20 | 2021-11-26 | 上海建工集团股份有限公司 | Three-dimensional automatic positioning concrete intelligent maintenance system and method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821780A (en) * | 2006-03-14 | 2006-08-23 | 江苏博特新材料有限公司 | Early capillary negative pressure automatic detector for concrete |
| CN101654957A (en) * | 2009-08-26 | 2010-02-24 | 江苏博特新材料有限公司 | Method for maintaining cement-based material in early stages |
| CN101805145A (en) * | 2010-03-12 | 2010-08-18 | 江苏省建筑科学研究院有限公司 | Plastic concrete water evaporation inhibitor and preparation method thereof |
| JP2010222820A (en) * | 2009-03-23 | 2010-10-07 | Wakachiku Construction Co Ltd | Method for curing concrete surface |
-
2011
- 2011-01-07 CN CN 201110003003 patent/CN102116091A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1821780A (en) * | 2006-03-14 | 2006-08-23 | 江苏博特新材料有限公司 | Early capillary negative pressure automatic detector for concrete |
| JP2010222820A (en) * | 2009-03-23 | 2010-10-07 | Wakachiku Construction Co Ltd | Method for curing concrete surface |
| CN101654957A (en) * | 2009-08-26 | 2010-02-24 | 江苏博特新材料有限公司 | Method for maintaining cement-based material in early stages |
| CN101805145A (en) * | 2010-03-12 | 2010-08-18 | 江苏省建筑科学研究院有限公司 | Plastic concrete water evaporation inhibitor and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《浙江建筑》 20051031 程波等 早期养护对现浇混凝土结构裂缝的影响 第22卷, 2 * |
| 《湖北水力发电》 19990331 周厚贵 三峡纵向围堰RCC夏季施工仓面喷雾技术 , 第32期 2 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113638613A (en) * | 2021-08-20 | 2021-11-12 | 上海建工集团股份有限公司 | Intelligent maintenance system and method for mass concrete of foundation slab |
| CN113695110A (en) * | 2021-08-20 | 2021-11-26 | 上海建工集团股份有限公司 | Three-dimensional automatic positioning concrete intelligent maintenance system and method |
| CN113695110B (en) * | 2021-08-20 | 2022-12-06 | 上海建工集团股份有限公司 | Three-dimensional automatic positioning concrete intelligent maintenance system and method |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN105298133B (en) | Lift the design and construction method of mass concrete invert crack resistance | |
| CN101125442A (en) | Carbon dioxide maintenance method and technology for concrete | |
| CN113668928B (en) | Method for controlling construction cracks of ultra-large-volume concrete water pool | |
| WO2020114041A1 (en) | Artificial cement-based ultra-high-performance stone slab | |
| CN101664959A (en) | Molding mold of concrete blocks and molding method thereof | |
| CN102828468A (en) | Construction method for controlling prefabricated crack of high-strength thin-walled box girder under high-temperature dry condition | |
| CN101654957B (en) | Method for maintaining cement-based material in early stages | |
| WO2007143885A1 (en) | An insulated and soundproof block and a masonry method thereof | |
| CN111350268A (en) | Construction method of concrete structure self-waterproof system in sewage treatment engineering | |
| CN109440563B (en) | Through-hole water permeable brick based on construction waste crushed material and manufacturing method thereof | |
| CN209620361U (en) | The board-like floating build floor of precast concrete with heat insulating and sound insulating function | |
| CN102116091A (en) | Early fog curing method of cement-based materials | |
| CN104446634A (en) | Aerated concrete insulation block and production method thereof | |
| JP4781290B2 (en) | Embedded formwork board | |
| CN112431311A (en) | Building block and production process thereof | |
| JP2011026849A (en) | Board for embedded form | |
| CN211250697U (en) | High-ductility cement-based material self-healing seepage test workpiece mold | |
| CN112757437B (en) | Solid waste large-mixing-amount concrete prefabricated laminated slab and preparation method thereof | |
| CN111749361B (en) | Construction method of gypsum spraying wall | |
| CN102758491A (en) | Shear wall thermal-insulation system and construction method of the system | |
| CN104181081A (en) | Test method for representing influence of aggregate base material interface of cement-base material on carbonization speed | |
| CN115745450B (en) | Method for enhancing adhesion and interfacial water stability of solid waste of building and application thereof | |
| CN218470335U (en) | Auxiliary forming device for testing mortar bonding performance | |
| CN221143247U (en) | Porous brick manufactured by sintering | |
| CN208235799U (en) | A kind of concrete structure |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C12 | Rejection of a patent application after its publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20110706 |