CN102505664A - Dam concrete anti-ageing method - Google Patents
Dam concrete anti-ageing method Download PDFInfo
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- CN102505664A CN102505664A CN2011103342454A CN201110334245A CN102505664A CN 102505664 A CN102505664 A CN 102505664A CN 2011103342454 A CN2011103342454 A CN 2011103342454A CN 201110334245 A CN201110334245 A CN 201110334245A CN 102505664 A CN102505664 A CN 102505664A
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Abstract
Disclosed is a dam concrete anti-ageing method. A polyurethane foam layer is coated on the surface of a concrete dam, after a dam heat-insulation and moisturizing layer is obtained, a polymer mortar layer is further covered on the concrete dam, and a dam heat-insulation moisturizing layer protecting layer is obtained; a layer of alkali-resistant fiberglass gridding cloth or an iron wire screen which is fixed by heat-insulation anchor bolts is laid outside the dam heat-insulation moisturizing layer protecting layer, another polymer mortar layer is covered on the alkali-resistant fiberglass gridding cloth or the iron wire screen, so that a protecting surface layer is obtained, and anti-ageing construction of a dam body is completed. In the technical scheme, the dam body is constructed, abilities including freezing and thawing resistance, leakage resistance, carbonized flow scouring resistance, abrasion resistance, cavitation resistance, durability, pressure resistance, crack resistance and impermeability of the dam body can be strengthened by the obtained protecting layer, and the protecting layer has the advantages that the protecting layer is attractive in appearance and fine in heat insulation and moisturizing performances, and does not pollute environments. The heat insulation and moisturizing performances are stable, and cannot be changed greatly along with weather change, and concrete cracks and concrete ageing due to change of weather conditions can be effectively controlled.
Description
Technical field
The invention belongs to water conservancy and hydropower dam concrete guard technology field, be specifically related to a kind of dam concrete antiaging method.
Background technology
Concrete dam is bulky, dam body face checking and to wear out in actual engineering be a comparatively general phenomenon.Cause dam body face checking and aging; Except the temperature humidity changing factor; Concrete autogenous volume contraction and other relevant shrinkage strains all can make dam concrete cracking and aging, as freeze thawing, seepage, carbonization stream wash away, the coefficient results of multiple factor such as wearing and tearing, cavitation erosion, alkali-aggregate reaction.
Preventing aspect the dam season cracking; Also have and be employed in the technical scheme that sprayed polyurethane layer comes heat and moisture preserving on the dam body; Through facts have proved; This scheme has been ignored a problem, and promptly polyurethane belongs to macromolecular material as easy as rolling off a log weather stain under illumination, even cracking curls, the part obscission is comparatively serious.
Summary of the invention
The object of the present invention is to provide a kind of dam concrete cracking and aging method of preventing, this method can satisfy various dam concrete because of temperature humidity variation, freeze thawing, seepage, carbonization stream wash away, wearing and tearing, cavitation erosion, needs that autogenous volume shrinks all can be made the dam concrete cracking and wear out with other relevant shrinkage strains.
The objective of the invention is to realize like this: a kind of dam concrete antiaging method may further comprise the steps:
(1) makes up dam heat and moisture preserving layer: on the concrete dam surface or the concrete surface polyurethane spray foam layer in dam bottom outlet, table hole, obtain dam heat and moisture preserving layer;
(2) make up dam heat and moisture preserving layer topping: cover the one layer of polymeric mortar at dam heat and moisture preserving laminar surface, obtain dam heat and moisture preserving layer topping;
(3) make up the protection back-up coat: the polymer mortar laminar surface at dam heat and moisture preserving layer topping is laid one deck alkali resistant glass fibre open weave cloth or wire gauze, and alkali resistant glass fibre open weave cloth or wire gauze are fixed on the concrete with the insulation bolt, and back-up coat is protected;
(4) make up the protection surface layer: on the alkali resistant glass fibre open weave cloth of protecting back-up coat or wire gauze, cover the one layer of polymeric mortar again, the surface layer that is protected is accomplished the anti-aging construction of dam concrete.
Described dam heat and moisture preserving layer thickness is 1-15cm.
Described polymer mortar is in cement mortar, to mix polymer powders to stir to close and form.
Composition in cement mortar and the polymer powders is counted with weight portion: sand 0.5-0.6, cement 0.2-0.3, water 0.1-0.2, polymer powders 0.01-0.02.
Polymer powders is that rubber powder, cellulose ether and starch ether mix form.
Composition in the polymer powders is counted with weight portion: rubber powder 10-20, cellulose ether 1, starch ether 1.
The thickness of described dam heat and moisture preserving layer topping is less than or equal to 1/2nd of dam heat and moisture preserving layer thickness.
The thickness of described protection surface layer is less than or equal to 1/2nd of dam heat and moisture preserving protective layer thickness.
Dam concrete antiaging method provided by the invention; Play the effect of heat and moisture preserving; Can reduce the crack that thermal stresses that the temperature and humidity luffing brings and drying shrinkage stress produce; Freeze thawing resistance, seepage, the carbonization stream that strengthens whole dam washes away, wearing and tearing, cavitation erosion, durability, resistance to compression, anticracking, impervious ability; Make the dam concrete be in the down operation of state of a relative constant temperature and humidity, reduced greatly that dam produces because of variations in temperature and humidity change, and self-deformation is to the cracking of dam generation, aging influence.
Through technical scheme provided by the invention dam body is constructed characteristics such as the topping that obtains has that good looking appearance, thermal insulation and moisture retention are good, free from environmental pollution, construction is simple and convenient,, good endurance bonding firmly with concrete surface; Its thermal insulation and performance of keeping humidity are stable; Because of climate change big fluctuation does not take place; Polyurethane foam is suitable for heat and moisture preserving is carried out on the dam concrete surface; And avoid concrete to contact with external environment, the bigger fluctuation of having controlled thermal stresses and drying shrinkage stress effectively produces fatigue and causes distress in concrete and concrete aging.
The protection surface layer purpose of laying at the dam body outermost layer is to strengthen being isolated of polyurethane layer and atmosphere, makes it not receive atmospheric effect, wears out, curls, ftractures, comes off, and forms the protection of polyurethane layer.
The thickness of control dam heat and moisture preserving layer topping and protection surface layer can make dam heat and moisture preserving layer topping and protection surface layer adhesion-tight.
The present invention is applicable to the anti-aging of preserving moisture of dam thermal insulation; Be specially adapted to cause the large volume concrete structural of face checking owing to variations such as temperature gradient and wet differences; Method provided by the invention is very effective for the generation that prevents the dam external crack, concrete aging; Compare with other means of defence, when reducing the protection cost, can access better protection effect.
Description of drawings
Below in conjunction with accompanying drawing and embodiment the present invention is described further.
Fig. 1 is the sketch map after the present invention accomplishes.
Fig. 2 is the degree/day luffing data of the O district different measuring degree of depth in the Test Example of the present invention.
Fig. 3 is the degree/day luffing data of the B district different measuring degree of depth in the Test Example of the present invention.
Fig. 4 is the degree/day luffing data of the C district different measuring degree of depth in the Test Example of the present invention.
Fig. 5 is the humidity data of the different measuring degree of depth.
Except that the temperature data, first letter representation measuring position in other data labels (pier number), second digit is represented the instrument position, promptly 1,2,3,4 represent 0cm, 1cm, 3cm, 6cm place temperature pick up respectively.
0cm, 3cm, 5cm represent the reading of the humidity sensor at corresponding concrete buried depth place in the hygrogram.
The specific embodiment
Embodiment:
Raw material is prepared: the polymer powders preparation: by weight, get rubber powder 10-20, and cellulose ether 1, starch ether 1 stirs and obtains polymer powders after closing.
Polymer mortar is prepared: by heavy part, get sand 0.5-0.6, and cement 0.2-0.3, water 0.1-0.2, polymer powders 0.01-0.02 stirs and obtains polymer mortar after closing, and the polymer mortar that obtains can reach compressive strength 31Mpa, and anti-folding reaches 6.0Mpa.
Concrete surface at concrete dam 6 covers one deck polyurethane foam.The method that polyurethane foam can adopt spraying, paste, pour into realizes; The polyurethane foam layer thickness decides according to the on-site weather conditions of dam and the temperature controlled needs of dam concrete; Bed thickness should form dam heat and moisture preserving layer 1 in the scope of 1cm～15cm.
Adopt polymer mortar to lay on dam heat and moisture preserving layer 1 surface, it mainly is that the adhesion strength that has improved mortar and basic unit, the deformability of mortar are performances such as cohesive strength flexible, mortar, forms dam heat and moisture preserving topping 2.The thickness of dam heat and moisture preserving layer topping 2 is less than or equal to 1/2nd of dam heat and moisture preserving layer 1 thickness.
Lay layer of glass grid cloth or one deck wire gauze on dam heat and moisture preserving topping 2 surfaces; Its mesh should be controlled at 1 ~ 5 centimeter; Adopting insulation bolt 5 that fiberglass gridding cloth or wire gauze are fixed on makes it paste clothes on heat and moisture preserving topping surface on the dam facing; The insulation bolt adopts heat-barrier material to process, and with the method for punching, lets the insulation bolt puncture 3 ~ 9 centimeters on the surface that heat and moisture preserving topping 2, heat and moisture preserving layer 1 hammer into dam.Form protection back-up coat 3.
On protection back-up coat fiberglass gridding cloth or wire gauze, repave the last layer polymer mortar, form protection surface layer 4, the bed thickness of protection surface layer 4 should be equal to or less than 1/2 of heat and moisture preserving topping 2,
Polymer mortar is laid and can be adopted spraying or the manual work two kinds of methods of wiping one's face.
The engineering test example:
Test is branch B district, C district and O district, wherein,
The thick polyurethane of B district spraying 8 cm;
The thick polymer mortar that polyurethane+3 cm are thick of C district spraying 8 cm;
The O district is test contrast district, spray coating heat preservation material not, and concrete is exposed.
Each district writes down the variation of concrete temperature, humidity apart from concrete surface 0cm, 1cm, 3cm and 6cm place embedded instrument, and filled with mortar is used in the slit between institute's embedded instrument and the concrete.
Fig. 2～Fig. 4 has shown through test in 60 days by the temperature pick up data of recorder record and the contrast of temperature.
As can beappreciated from fig. 2, O district variations in temperature and temperature Change rule are basic identical, and luffing is bigger, and fathom from the superficial to the deep that luffing reduces gradually.
Comparison diagram 2 can be known with Fig. 3, Fig. 4; The concrete temperature at each degree of depth place, B district changes and significantly reduces than the O district; It is thus clear that adopt the present invention to carry out after the spraying of heat insulating material, polyurethane is remarkable to concrete temperature protection effect, can't see the fluctuation of each degree of depth place concrete temperature basically.
Comparison diagram 3 can be found out with Fig. 4; The C district add on the basis in B district sprayed the thick polymer mortar of 3 cm after; Further reduced the range of temperature of concrete different buried depth, and under the identical time, the temperature of concrete integral body is also lower; It is thus clear that polymer mortar has guaranteed the durability of polyurethane heat insulation material and has strengthened its anti-damage performance, strengthened the heat insulation effect of heat insulating material equally.
The survey data of humidity sensor is as shown in Figure 5.The air humidity value that left side, right side, upstream face record is consistent, and every day, air humidity was unsteady bigger, and the rule of floating is basic identical, and amplitude is different.Job site air humidity average is about 20 %RH, and every day, average amplitude was about 40 %RH.Be embedded in the concrete of heat insulating material below, As time goes on humidity value tends towards stability.Concrete surface receives material protections such as polyurethane, and humidity rises to 50 %RH by 8 %RH before the protection are stable, and interior humidity all remains on 90 %RH.Above result shows that through the material sprayed protection, not only the concrete relative humidity variations has reduced, and the surface moisture gradient also greatly reduces, and this is very favorable to concrete anticracking.
Claims (8)
1. dam concrete antiaging method is characterized in that: may further comprise the steps:
(1) makes up dam heat and moisture preserving layer: on concrete dam (6) surface or the concrete surface polyurethane spray foam layer in dam bottom outlet, table hole, obtain dam heat and moisture preserving layer (1);
(2) make up dam heat and moisture preserving layer topping: cover the one layer of polymeric mortar at dam heat and moisture preserving laminar surface, obtain dam heat and moisture preserving layer topping (2);
(3) make up the protection back-up coat: the polymer mortar laminar surface at dam heat and moisture preserving layer topping is laid one deck alkali resistant glass fibre open weave cloth or wire gauze; Alkali resistant glass fibre open weave cloth or wire gauze are fixed on the concrete back-up coat that is protected (3) with insulation bolt (5);
(4) make up the protection surface layer: on the alkali resistant glass fibre open weave cloth of protecting back-up coat or wire gauze, cover the one layer of polymeric mortar again, the surface layer that is protected (4) is accomplished the anti-aging construction of dam concrete.
2. dam concrete antiaging method according to claim 1 is characterized in that: described dam heat and moisture preserving layer (1) thickness is 1-15cm.
3. dam concrete antiaging method according to claim 1 is characterized in that: described polymer mortar is in cement mortar, to mix polymer powders to stir to close and form.
4. dam concrete antiaging method according to claim 3 is characterized in that: the composition in cement mortar and the polymer powders is counted with weight portion: sand 0.5-0.6, cement 0.2-0.3, water 0.1-0.2, polymer powders 0.01-0.02.
5. according to claim 3 or 5 described dam concrete antiaging methods, it is characterized in that: polymer powders is that rubber powder, cellulose ether and starch ether mix form.
6. dam concrete antiaging method according to claim 5 is characterized in that: the composition in the polymer powders is counted with weight portion: rubber powder 10-20, cellulose ether 1, starch ether 1.
7. dam concrete antiaging method according to claim 1 is characterized in that: the thickness of described dam heat and moisture preserving layer topping (2) is less than or equal to 1/2nd of dam heat and moisture preserving layer (1) thickness.
8. dam concrete antiaging method according to claim 1 is characterized in that: the thickness of described protection surface layer (4) is less than or equal to 1/2nd of dam heat and moisture preserving topping (2) thickness.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049871A (en) * | 2016-05-20 | 2016-10-26 | 深圳市金河建设集团有限公司 | Anti-cracking construction method for concrete and aggregate blow-cooling machine for method |
| CN106517923A (en) * | 2016-10-18 | 2017-03-22 | 马鞍山华之智信息科技有限公司 | Heat-conducting and heat-storing concrete material with short final setting period and preparation method and application thereof |
| CN108086251A (en) * | 2017-11-30 | 2018-05-29 | 中国电建集团成都勘测设计研究院有限公司 | A kind of concrete dam |
| CN109972589A (en) * | 2019-04-30 | 2019-07-05 | 新疆额尔齐斯河流域开发工程建设管理局 | Severe cold area dam heat preservation monoblock type anti-ice pulls out structure sheaf |
| CN110205983A (en) * | 2019-05-20 | 2019-09-06 | 松花江水力发电有限公司丰满大坝重建工程建设局 | Severe cold area dam thermal-insulating leakage-resistant is anti-icing to pull out protection system and its construction method |
| CN114960563A (en) * | 2022-04-29 | 2022-08-30 | 宜昌天宇科技有限公司 | Anti-aging structure and method along with increase of strength of dam concrete for long time |
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| CN2506694Y (en) * | 2001-09-14 | 2002-08-21 | 宜昌天宇科技有限公司 | Dam capable of preventing surface from cracking |
| CN101481930A (en) * | 2009-01-22 | 2009-07-15 | 大连理工大学 | Construction structure for textile reinforced composite reinforced bar concrete and manufacturing method thereof |
| JP2009262992A (en) * | 2008-04-30 | 2009-11-12 | Toppan Printing Co Ltd | Small liquid bag package |
| CN101824813A (en) * | 2009-05-11 | 2010-09-08 | 宜昌天宇科技有限公司 | Dam crack and aging resisting method based on coupled temperature and humidity transfer |
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Patent Citations (4)
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| CN2506694Y (en) * | 2001-09-14 | 2002-08-21 | 宜昌天宇科技有限公司 | Dam capable of preventing surface from cracking |
| JP2009262992A (en) * | 2008-04-30 | 2009-11-12 | Toppan Printing Co Ltd | Small liquid bag package |
| CN101481930A (en) * | 2009-01-22 | 2009-07-15 | 大连理工大学 | Construction structure for textile reinforced composite reinforced bar concrete and manufacturing method thereof |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106049871A (en) * | 2016-05-20 | 2016-10-26 | 深圳市金河建设集团有限公司 | Anti-cracking construction method for concrete and aggregate blow-cooling machine for method |
| CN106517923A (en) * | 2016-10-18 | 2017-03-22 | 马鞍山华之智信息科技有限公司 | Heat-conducting and heat-storing concrete material with short final setting period and preparation method and application thereof |
| CN108086251A (en) * | 2017-11-30 | 2018-05-29 | 中国电建集团成都勘测设计研究院有限公司 | A kind of concrete dam |
| CN109972589A (en) * | 2019-04-30 | 2019-07-05 | 新疆额尔齐斯河流域开发工程建设管理局 | Severe cold area dam heat preservation monoblock type anti-ice pulls out structure sheaf |
| CN110205983A (en) * | 2019-05-20 | 2019-09-06 | 松花江水力发电有限公司丰满大坝重建工程建设局 | Severe cold area dam thermal-insulating leakage-resistant is anti-icing to pull out protection system and its construction method |
| CN114960563A (en) * | 2022-04-29 | 2022-08-30 | 宜昌天宇科技有限公司 | Anti-aging structure and method along with increase of strength of dam concrete for long time |
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| CN102505664B (en) | 2014-07-02 |
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