CN101042329A - Equipment for simulating dry-wet circulation and fresh water to sea water circulation - Google Patents
Equipment for simulating dry-wet circulation and fresh water to sea water circulation Download PDFInfo
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- CN101042329A CN101042329A CN 200710040034 CN200710040034A CN101042329A CN 101042329 A CN101042329 A CN 101042329A CN 200710040034 CN200710040034 CN 200710040034 CN 200710040034 A CN200710040034 A CN 200710040034A CN 101042329 A CN101042329 A CN 101042329A
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Abstract
This invention relates to one dry and wet and fresh water and sea water recycle analogue device , which comprises shower spray head, water tank, tank rack, drive system, rotation rack and erosion liquid tank, wherein, the drive system gear is fixed onto motor axis connected to controller; the rotation rack is composed of round ring, round rack and specimen rack and the round ring is fixed on other side of round rack to make it vertical to earth level; the drive gear shape and round ring shape are meshed with one side set with erosion liquid tank and down part in the tank; specimen rack end is vertical to round ring outer one; the spray head is one round ring fixed down spray water tank rack.
Description
Technical field
The present invention relates to a kind of drying and watering cycle and fresh water-seawater circulating analog device.
Background technology
River, river estuary place in China have planned many more rivers, engineerings over strait, because tidal action, go into river, river course in inwelling at the incoming tide, flood the following xoncrete structure in tidal range district, make concrete stand the erosion of villaumite and various sulfate; When at ebb tide, river, river begin the erosion concrete, make it stand fresh water and corrode, and tidal range district concrete is exposed in the air again simultaneously.So that the xoncrete structure of these engineerings is in is dried-wet circulation and fresh water-seawater round-robin corrosion environment.
Concrete under marine environment is called as maritime concrete or ocean concrete; its main failure mode is that the Cl ion is invaded concrete cover and caused steel bar corrosion in the ocean, and the long-term corrosion concrete of various sulfate in the seawater causes expansion damage simultaneously.So, generally study its permanance by the way that concrete sample is immersed in the seawater.For the xoncrete structure at river, river estuary place,, then can produce more serious erosion damage rule owing to there is the aforementioned environmental characteristic that is different from maritime concrete.
The erosion damage mechanism of sulfate is in the seawater, and sulfate liquor infiltrates in the concrete pore and produces crystallization, and when crystallization runs up to when a certain amount of, the crystallographic expansion that is produced crushes bad xoncrete structure.For the concrete that is soaked in the seawater always, sulfate liquor is at first invaded in the concrete surface pore, constipation crystalline substance when concentration runs up to certain value, and dry run is accelerated crystallization rate.Early stage crystal can stop up hole and stop sulfate liquor further to invade inside concrete, but in the tidal range district, owing to there is drying and watering cycle, crystallization and the vitriol that is jammed in the surface pore shrink owing to dry, make blocked pore channel unobstructed again, sulfate is entered darker inside concrete, the more serious expansion damage of final generation.This is that tidal range district concrete is than a more serious major reason of concrete destruction that is soaked in fully in the seawater.If there is fresh water-seawater circulation simultaneously, then fresh water may dissolve the vitriol of part crystallization and wash away from the body structure surface hole, makes hole more unimpeded, the easier intrusion structure of sulfate depths.So there are certain gap in the concrete works corrosion environment and the complete maritime corrosion environment at river, river estuary place, study such concrete permanance and need find pointed research method so that find effective guard technology measure.
About the anti-marine denudation research of concrete, main method is generally with reference to ASTM C1012-02, ASTM C452-02, ASTM C1092-95A, GB/T749-01 " Sulphate resistance test for cement " and GB2420-81 " Rapid test for sulphate resistance of cement " etc.The common feature of these methods be with the sample continuous dipping in sulfate liquor, adopt various Study on Test Method samples to be soaked destructiveness after the regular period then.Also do not have a kind of standard method up till now, can simulate the river, the existing drying and watering cycle in river estuary place has fresh water-seawater round-robin concrete erosion environment again.
In sum, study a kind of simulation concrete and stand the experimental provision that drying and watering cycle and fresh water-seawater circulation is corroded, split the exhibition position in China river, the engineering concrete durability research over strait of river more at river estuary place has realistic meaning and theoretical direction is worth.
Summary of the invention
The object of the present invention is to provide a kind of drying and watering cycle and fresh water-seawater circulating analog device.
Drying and watering cycle and fresh water-seawater circulating analog device that the present invention proposes are made up of shower nozzle 1, tank 3, tank support 10, kinematic train, swivel mount and attack solution groove 8, and its structure as depicted in figs. 1 and 2.Wherein, kinematic train is made up of transmission gear 4, controller 5 and motor 6, and transmission gear 4 is fixed on the axle 13 of motor 6, and controller 5 and motor 6 are connected by lead; Swivel mount is made up of annulus 2, circle ring rack 7 and specimen mounting 9, and the home position of annulus 2 is fixed in an end of circle ring rack 7 by axle 12, and annulus 2 can be rotated freely on circle ring rack 7; Profile of tooth on the profile of tooth of transmission gear 4 and annulus 2 outer shrouds matches; Circle ring rack 7 one sides are provided with attack solution groove 8, and a side of annulus 2 is positioned at attack solution groove 8; One end vertical fixing of specimen mounting 9 is on the outer shroud of annulus 2 discs, and the other end is unsettled; Shower nozzle 1 is positioned at annulus 2 tops, and tank 3 is fixed on the tank support 10, and the specimen mounting 9 that is fixed in annulus 2 peripheral tops is between shower nozzle 1 and tank 3.
Among the present invention, sample 11 is fixed on the specimen mounting 9.
Among the present invention, be full of sulfate or chloride erosion solution in the attack solution groove 8.
The course of work of the present invention is as follows:
The sand-cement slurry or the concrete sample 11 that prepare in advance are fixed on the rotatable specimen mounting 9, connect the power supply of controller 5, regulate startup interval time and each motor rotation time of motor 5, make circle ring rack 7 rotate (as adopting a circle/sky) according to the cycle period of design, make the rotation of the sample 11 that is fixed on the specimen mounting 9 along with circle ring rack 7, sample 7 immerses in the attack solution grooves 8, sample is finished once for 11 every days doing-circulation and the once circulation in fresh water-briny environment in wet environment; Shower nozzle 1 links to each other with freshwater source (as tap water), opens shower nozzle 1, and regulating pondage makes the sample 11 that sprays can keep evenly wetting, fills in the attack solution groove 8 according to attack solution such as sulfate that designs preparation or villaumites.
Beneficial effect of the present invention:
Adopting device of the present invention with tradition the direct immersion of sample to be done contrast with the method in the attack solution tests, in identical sulphate attack solution and identical erosion time thereof, the sand-cement slurry sample that obtains by apparatus of the present invention is subjected to the sulphate attack destructiveness more serious than classic method.This shows that on the one hand device of the present invention can increase substantially the efficient to cement, Sulfate Resistance of Concrete research; Also explanation simultaneously, device of the present invention be owing to can simulate drying and watering cycle and the fresh water-seawater circulation environment that river, river estuary place are caused by morning and evening tides, thus than tradition with the more approaching actual engineering specifications of the method for sample continuous dipping in attack solution.
Description of drawings
Fig. 1 is a cross-sectional configuration synoptic diagram of the present invention.
Fig. 2 is a longitudinal plane structure synoptic diagram of the present invention.
Number in the figure: 1 is shower nozzle, and 2 is annulus, and 3 is tank, and 4 is power wheel, and 5 is controller, and 6 is motor, and 7 is circle ring rack, and 8 is the attack solution groove, and 9 is specimen mounting, and 10 is the tank support.11 is sample, and 12 is motor shaft, and 13 is the axle on the circle ring rack 7.
Embodiment
Further specify the present invention in conjunction with the accompanying drawings below by embodiment.
Embodiment 1: adopt stainless steel material to make annulus 2, the diameter of annulus 2 can determine that general diameter is the rectangle sample 11 that 1 meter annulus 2 once can be laid 60 4 * 4 * 16cm at most according to each sample size of test that needs.To wait the stainless steel angle steel of quantity or stainless steel band steel as specimen mounting 9 according to test specimens 11 quantity that can lay, the one end is welded on the round outer shroud perpendicular to disc, and the other end is unsettled, at fixing rubber gear tooth of one week of the circle outside of annulus 2; Make circle ring rack 7, annulus 2 is installed on the circle ring rack 7 by axle, annulus 2 can be rotated on circle ring rack 7 freely, thereby form swivel mount.
Select motor 6, be generally two motors, the weight of its power according to annulus 2 and when filling sample 11 is determined, is generally less than 0.5 kilowatt; The energising ability of controller 5 should adapt to motor 6 power consumptions, has plurality of specifications available on the market; Gear 4 is fixed on the axle of motor 6, the cog of gear 4 is corresponding with the rubber gear tooth in annulus 2 outsides; Controller 5 and motor 6 are linked together and form kinematic train jointly with lead with gear.
Make pellet type tank 3, its size determines according to sample size, for the rectangle sample of 4 * 4 * 16cm, general long for 30cm, wide be 20cm, the high 6cm of being; Make the tank support, its size does not make tank 3 collision swivel mounts be as the criterion so that tank 3 can all be caught the water that shower nozzle 1 oozes; With a termination tank 3 bottoms of plastic conduit, another termination sewer or the collection container import that is provided with for cycling use of water.
Make rectangle attack solution groove 8, its size fills with attack solution with it and can soak on the swivel mount specimen mounting of 15%-30% fully and be advisable.
According to mode illustrated in figures 1 and 2 above-mentioned device is installed, shower nozzle 1 is fixed in annulus 2 upper ends, it is other that motor 6 is fixed in circle ring rack 7, and transmission gear 4 is contacted with the rubber gear tooth in annulus 2 outsides.
The sand-cement slurry or the concrete sample 11 that prepare in advance are fixed on the rotatable specimen mounting 9, connect the power supply of controller 5, regulate startup interval time and each motor rotation time of motor, swivel mount is rotated according to the cycle period of design, be generally a circle/sky, doing-circulation and the once circulation in fresh water-briny environment in wet environment even test specimens is finished once every day; Open shower nozzle, regulating pondage makes the sample 11 that sprays can keep evenly wetting.The shape of sample 11 is generally the rectangle of 4 * 4 * 16cm, also can be other shapes such as cylindrical, irregular shape, adopts corrosion resistant rope binding, is fixed on the specimen mounting 9.In attack solution groove 8, fill with according to attack solution such as sulfate that designs preparation or villaumites.
Adopt identical match ratio to prepare the sand-cement slurry sample of 3 groups of 4 * 4 * 16cm, every group of 3 test blocks, treat to get after the 28 day length of time 2 groups of samples and adopt experimental provision of the present invention and method and tradition to do the contrast test respectively, another group sample continues maintenance in standard curing room as blank sample.Classic method in the attack solution of 4% sulfuric acid U.S.+4% sodium sulphate, also is equipped with same attack solution in the attack solution groove 8 of apparatus of the present invention with the sample continuous dipping, and adjustment control 5 circles swivel mount every day.
To take out, dry by the sand-cement slurry sample of 2 kinds of method experiments respectively after 3 months, test the rupture strength of 2 groups of samples, simultaneously the rupture strength of blank testing sample.Use the rupture strength of the rupture strength of 2 kinds of experimental samples respectively divided by blank sample, obtain the ratio of 2 kinds of rupture strengths, this ratio is the foundation of passing judgment on sample resisting erosion of sulfate ability, and ratio is high more, and expression sulfate resistance ability erosion damage strong more or sulfate is weak more.Experiment and result of calculation are as shown in table 1.
The product that product that table 1 employing apparatus of the present invention obtain and classic method obtain is about the contrast and experiment of sulphate attack
| Rupture strength/MPa | |||||||||
| Blank sample | The inventive method sample | The classic | |||||||
| Sample | |||||||||
| 1 | | | | | | | | | |
| Test value | 9.72 | 9.65 | 9.47 | 7.6 | 7.1 | 7.2 | 8.0 | 8.5 | 8.3 |
| Mean value | 9.61 | 7.30 | 8.27 | ||||||
| | 1 | 0.76 | 0.86 | ||||||
From the experimental result of table 1 as can be seen, in identical sulphate attack solution and identical erosion time thereof, the sample that obtains by apparatus of the present invention is significantly less than by the ratio of rupture strength and blank sample rupture strength after the sulphate attack and adopts the ratio of tradition with sample continuous dipping sample rupture strength that method obtains in attack solution and blank sample rupture strength, promptly promotes the sand-cement slurry sample that apparatus of the present invention obtain and is subjected to the sulphate attack destructiveness more serious than classic method.This shows that on the one hand device of the present invention can increase substantially the efficient to cement, Sulfate Resistance of Concrete research; Also explanation simultaneously, device of the present invention be owing to can simulate drying and watering cycle and the fresh water-seawater circulation environment that river, river estuary place are caused by morning and evening tides, than tradition with the more approaching actual engineering specifications of the method for sample continuous dipping in attack solution.
Claims (3)
1, a kind of drying and watering cycle and fresh water-seawater circulating analog device, form by shower nozzle (1), tank (3), tank support (10), kinematic train, swivel mount and attack solution groove (8), it is characterized in that kinematic train is made up of transmission gear (4), controller (5) and motor (6), transmission gear (4) is fixed on the axle (13) of motor (6), and controller (5) is connected by lead with motor (6); Swivel mount is made up of annulus (2), circle ring rack (7) and specimen mounting (9), and the home position of annulus (2) is fixed in an end of circle ring rack (7) by axle (12), and annulus (2) can be rotated on circle ring rack (7) freely; Profile of tooth on the profile of tooth of transmission gear (4) and annulus (2) outer shroud matches; Circle ring rack (7) one sides are provided with attack solution groove (8), and a side of annulus (2) is positioned at attack solution groove (8); One end vertical fixing of specimen mounting (9) is on the outer shroud of annulus (2) disc, and the other end is unsettled; Shower nozzle (1) is positioned at annulus (2) top, and tank (3) is fixed on the tank support (10) of shower nozzle (1) below, and specimen mounting (9) is along with rotation is passed through between tank (3) and the shower nozzle 1.
2, drying and watering cycle according to claim 1 and fresh water-seawater circulating analog device is characterized in that sample (11) is fixed on the specimen mounting (9).
3, drying and watering cycle according to claim 1 and fresh water-seawater circulating analog device is characterized in that being full of in the attack solution groove (8) sulfate or chloride erosion solution.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100400343A CN100533117C (en) | 2007-04-26 | 2007-04-26 | Equipment for simulating dry-wet circulation and fresh water to sea water circulation |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100400343A CN100533117C (en) | 2007-04-26 | 2007-04-26 | Equipment for simulating dry-wet circulation and fresh water to sea water circulation |
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| CN101042329A true CN101042329A (en) | 2007-09-26 |
| CN100533117C CN100533117C (en) | 2009-08-26 |
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| CNB2007100400343A Expired - Fee Related CN100533117C (en) | 2007-04-26 | 2007-04-26 | Equipment for simulating dry-wet circulation and fresh water to sea water circulation |
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| CN101832906A (en) * | 2010-04-13 | 2010-09-15 | 中国船舶重工集团公司第七二五研究所 | Accelerated test method and device for simulating freshwater-seawater alternate environment |
| CN102466669A (en) * | 2010-11-12 | 2012-05-23 | 欧忠文 | Fully-automatic cement base material dry-wet cycle testing machine |
| CN103217377A (en) * | 2013-04-09 | 2013-07-24 | 长安大学 | Rapid determination device of salt corrosion resistance performance of concrete and determination method thereof |
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| CN2849710Y (en) * | 2005-12-02 | 2006-12-20 | 冷发光 | Device for sulfate resistance test of concrete |
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| CN101793657A (en) * | 2010-03-18 | 2010-08-04 | 长安大学 | Test device for scour resistance of base course |
| CN101832906A (en) * | 2010-04-13 | 2010-09-15 | 中国船舶重工集团公司第七二五研究所 | Accelerated test method and device for simulating freshwater-seawater alternate environment |
| CN101832906B (en) * | 2010-04-13 | 2013-01-02 | 中国船舶重工集团公司第七二五研究所 | Accelerated test method and device for simulating freshwater-seawater alternate environment |
| CN102466669A (en) * | 2010-11-12 | 2012-05-23 | 欧忠文 | Fully-automatic cement base material dry-wet cycle testing machine |
| CN103217377A (en) * | 2013-04-09 | 2013-07-24 | 长安大学 | Rapid determination device of salt corrosion resistance performance of concrete and determination method thereof |
| CN103217377B (en) * | 2013-04-09 | 2015-04-22 | 长安大学 | Rapid determination device of salt corrosion resistance performance of concrete and determination method thereof |
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