CN102155092A - Process for constructing long intermittent layer in wind, dry, hot and high-evaporation environments - Google Patents
Process for constructing long intermittent layer in wind, dry, hot and high-evaporation environments Download PDFInfo
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- CN102155092A CN102155092A CN 201010588245 CN201010588245A CN102155092A CN 102155092 A CN102155092 A CN 102155092A CN 201010588245 CN201010588245 CN 201010588245 CN 201010588245 A CN201010588245 A CN 201010588245A CN 102155092 A CN102155092 A CN 102155092A
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Abstract
The invention provides a process for constructing a long intermittent layer in wind, dry, hot and high-evaporation environments. The process comprises the following steps of: cleaning a concrete surface; and paving a layer mix, wherein the cleaning treatment comprises flushing treatment with high-pressure water and soaking treatment; the layer mix is paved by the following steps of: paving a layer of cement paste with the thickness of 2-4 millimeters; and paving mortar of 1-2 centimeters. Mortar paved around a junction surface is preferably acrylic emulsion mortar. Preferably, the thickness of the cement paste is 3 millimeters, and the thickness of the mortar is 1.5 centimeters. The process for constructing the long intermittent layer in the wind, dry, hot and high-evaporation environments is simple, and is easy to operate. By adopting the process, negative influences of environmental factors such as wind, dryness, heat, high evaporation and the like can be restrained, and horizontal cracks on the long intermittent layer are avoided.
Description
Technical field
The present invention relates to a kind of wind, do, long pause layer construction technology under heat and the high evaporation environment, described long pause layer is the setting course between the two-layer roller compacted concrete.
Background technology
Build in the process at roller compacted concrete, because various factors causes upper strata roller compacted concrete making time and lower floor's roller compacted concrete making time interval longer, then this two-layer concrete bonding surface is the long pause aspect.The long pause aspect promptly forms the cold seam of construction, and the cold seam of constructing must carry out the seam face to be handled, otherwise, be prone to horizontal fracture.Before the making long pause layer, generally adopt bristle, remove the laitance of concrete surface in early stage and become flexible aggregate towards methods such as hairs; Aspect is finished dealing with and is cleaned up, qualified by inspection after, repave the bed course mix that is used to form the long pause layer, making last layer concrete continues construction immediately then.
Yet at wind, do, under heat and the high evaporation environment,, still horizontal fracture can occur even lay the long pause layer according to the method described above.Described wind, do, the area at heat and high evaporation environment place is the aridity weather, particularly, for example have following characteristics: annual range of temperature is higher than 60 ℃; Mean wind speed is higher than 1.5m/s for many years, and maximum wind velocity is higher than 20m/s; Dry, mean annual precipitation is less than 200mm, and average evaporation capacity is higher than 1800mm for many years, and average for many years sunshine duration is more than 2700h.Wind, do, the various unfavorable factors of heat and high evaporation environment all may have influence to the appearance of horizontal fracture, if the direct adverse effect that controls environment by the means of humidifying cooling minimizing evaporation, the higher difficult realization of difficulty is necessary to find a kind of simple effective method to avoid occurring horizontal fracture.
Summary of the invention
The objective of the invention is to improve a kind of wind, do, long pause layer construction technology under heat and the high evaporation environment, horizontal fracture appears to avoid the long pause layer.
Wind provided by the invention, do, long pause layer construction technology is under heat and the high evaporation environment: earlier concrete surface is carried out cleaning treatment, matting layer mix then, described cleaning treatment comprises that high-pressure water hair is handled and infiltration is handled, described matting layer mix comprises the steps: the thick cement paste of shop one deck 2～4mm earlier, repaves 1～2cm mortar.
Bonding surface periphery institute sanding slurry is preferably the third newborn mortar.
Preferably, the thickness of described cement paste is 3mm, and the thickness of described mortar is 1.5cm.
Wind provided by the invention, do, the simple and easy operating of long pause layer construction technology under heat and the high evaporation environment, reached extraordinary effect, can resist wind, do, the adverse effect of environmental factors such as heat and high evaporation, avoided the long pause layer horizontal fracture to occur.
The specific embodiment
Below by specific embodiment and Comparative Examples the present invention is further specified.The long pause layer construction technology of embodiment and Comparative Examples is that institute uses or proof method when building that the Xinjiang noise made in coughing or vomiting is cured moulds gram key water control project Compacted Concrete Gravity Dam Section.Fuhai County and Fuyun County that the cured construction site of moulding gram key water control project Compacted Concrete Gravity Dam Section of noise made in coughing or vomiting is positioned at the Altay Prefecture, Xinjiang are domestic, geographical position, location latitude height (north latitude 47 ° 03 '～47 ° 12 '), weather is subjected to the influence in Junggar Basin Gu Erbantonggute desert, its climate characteristic is " hot and cold a, wind, dried ", and abominable natural environment is peerless in China's Construction of Rolled Concrete Dam of the same type.Engineering region of living in spring and autumn is short, winter very long and many severe cold, summer is extremely hot, the annual range of temperature great disparity, temperature difference per day is big.Temperature on average is 2.7 ℃ for many years, 40.1 ℃ of the extreme highest temperatures, the extreme lowest temperature-49.8 ℃; Mean wind speed 1.8m/s for many years, maximum wind velocity 25m/s; Dry, mean annual precipitation is 183.9mm, and average evaporation capacity is 1915.1mm for many years, and mean annual precipitation only is 9.6% of an evaporation capacity, and average for many years water surface evaporation is 1168.2mm; 4～October, average relative humidity was 20% for many years; Average for many years sunshine duration 2864.5h.
At first the roller compacted concrete casting craft before and after the long pause layer construction technology is described.
Roller compacted concrete is built the P.O42.5 that the cement that uses is produced as the cement plant, Tianshan Mountains, and product batch number is P4428, and institute's inspection project is all qualified.Every detection data see Table 1.
Table 1 cement detection statistics table
Institute's fly ash is the I level flyash that Hua Xiang company produces in the roller compacted concrete, and product batch number is 07-96,07-97.Every detection data see Table 2.By consulting flyash quality grading table as can be known, when the fineness of flyash smaller or equal to 12%, loss on ignition is smaller or equal to 5%, water demand ratio be I level flyash, so the flyash credit rating adhered to specification smaller or equal to 95% o'clock.
Table 2 flyash detection statistics table
| Lot number | Water content (%) | Fineness (%) | Water demand ratio (%) | Loss on ignition (%) |
| 07-96 | 0.01 | 7.8 | 95 | 4.8 |
| 07-97 | 0.02 | 7.7 | 95 | 4.5 |
The water reducing agent that roller compacted concrete is built use is the PMS-3A efficient retarding and water reducing agent of Xinjiang five outstanding Industry investment Co., Ltd, and product batch number is H07062205.Every detection data see Table 3.
Table 3 water reducing agent detection statistics table
Fines adopts washing natural sand in the roller compacted concrete, detects altogether 2 times, and all qualified, every detection data see Table 4.
Table 4 washing natural sand detection statistics table
| Moisture content (%) | Mud content (%) | Clod content (%) | Fineness modulus |
| 5.6-5.8 | 1.2 | 0 | 2.66-2.70 |
Coarse aggregate adopts the artificial rubble of gneiss granite in the roller compacted concrete, detects altogether 2 times, and all qualified, every detection data see Table 5.
The artificial rubble detection statistics table of table 5
Roller compacted concrete machine mouth mix detects 11 times, 13.5 ℃ of machine outlet concrete temperature minimum value, and 17.0 ℃ of maximum values, 15.5 ℃ of averages, every detection data see Table 6.
Table 6 machine mouth concrete mix temperature control statistical form
| Sequence number | Machine implication temperature (℃) | Machine mouth concrete temperature (℃) | Machine mouth VC value (s) |
| 1 | 28.0 | 16.0 | 2.7 |
| 2 | 26.0 | 16.0 | 3.0 |
| 3 | 25.0 | 15.8 | 2.6 |
| 4 | 23.8 | 15.9 | 2.7 |
| 5 | 22.0 | 15.9 | 2.7 |
| 6 | 20.0 | 15.0 | 2.8 |
| 7 | 18.0 | 14.0 | 3.0 |
| 8 | 17.8 | 13.5 | 2.5 |
| 9 | 23.0 | 15.5 | 3.0 |
| 10 | 24.0 | 16.0 | 2.8 |
| 11 | 25.0 | 17.0 | 2.1 |
Storehouse surface concrete mix detects 21 times, builds 12.0 ℃ of temperature minimum value, 20.0 ℃ of maximum values, and 15.9 ℃ of averages see table 7 for details.Machine outlet VC value 2.1～3.0s, storehouse face VC value 3～4.6s, the VC value all meets design requirement.
Table 7 storehouse surface concrete mix temperature control statistical form
Roller compacted concrete is built 3 kinds of match ratios of common use, and design grade is respectively R180150F50W4, R180200F300W10, R180200F200W6, and compressive strength detected value in 28 days, the 180 day length of time sees Table 8, and the design age compression strength value all meets design requirement.
Table 8 roller compacted concrete test block compressive strength detected value table
By above to roller compacted concrete raw material and mix detection case as can be known, the every performance indications of raw material that adopted and mixture thereof adhere to specification.
The temperature control measures of taking during construction is: the above concrete of building any time of lid high density concrete is all taked initial stage water flowing cooling, single cooling water pipe length 200m, and the cooling water pipe spacing is 1.5 * 1.5m; Cooling water total amount by single every cooling water pipe is 1.2m
3/ h, initial stage cooling 12h after the concreting begins water flowing; The cooling water temperature of cooling water pipe entrance remains on about 15 ℃, and be 20d cool time.6,7, August the concrete of building take the second stage of water flowing cooling, the second stage of water flowing cooling is in beginning on October 1, the cooling water temperature of cooling water pipe entrance remains on about 10 ℃, be 10d cool time.The intact rear surface of concreting adopts the thick XPS extruded sheet heat insulating material of 10cm to carry out the insulation whole year.
The cured gram key water control project Compacted Concrete Gravity Dam Section of moulding of noise made in coughing or vomiting carries out having built the thick lid high density concrete of 3m earlier before the consolidation grouting, and concrete strength carries out consolidation grouting after satisfying the consolidation grouting requirement, and interlayer is about 2 months blanking time.The consolidation grouting aspect is the long pause aspect.This Compacted Concrete Gravity Dam Section crest elevation 745.50m, maximum height of dam 49.5m; Monolith width along axis of dam direction is 20m, maximum bottom width 37.50m, the long pause layer monolith foundation plane elevation 695.67～697.33m of following examples and Comparative Examples.
Following examples and Comparative Examples are only described long pause layer construction technology, other process of dam body construction is all identical, above-described is exactly these common processes, and what be not described to all operates according to DL/T5112-2000 " water conservancy project grinding concrete construction standard ".
Embodiment long pause layer construction technology
At first adopt high-pressure water hair, after the acceptance(check), bonding surface is fully soaked into, before building the upper strata roller compacted concrete, one deck 3mm thick cement paste in shop repaves the 1.5cm mortar earlier, wherein at the third thick newborn mortar of bonding surface periphery shop one deck 1.5cm.After adopting this construction technology, the long pause aspect of construction in later period horizontal fracture do not occur in conjunction with good.
Comparative Examples long pause layer construction technology
Before building the upper strata roller compacted concrete, taked high-pressure water hair, after the acceptance(check), shop 1.5cm mortar carries out the concrete making of last layer then and rolls.Carry out finding when this position outward appearance is checked and accepted a horizontal fracture after 2 months.Find the downstream horizontal fracture degree of depth less than 3m by detecting, the upstream face horizontal fracture degree of depth is less than 4m, and dam body is not run through in the crack.
Claims (3)
- Wind, do, long pause layer construction technology under heat and the high evaporation environment, earlier concrete surface is carried out cleaning treatment, matting layer mix then, it is characterized in that: described cleaning treatment comprises that high-pressure water hair is handled and infiltration is handled, described matting layer mix comprises the steps: the thick cement paste of shop one deck 2～4mm earlier, repaves 1～2cm mortar.
- 2. wind according to claim 1, do, long pause layer construction technology under heat and the high evaporation environment, it is characterized in that: bonding surface periphery institute sanding slurry is the third newborn mortar.
- 3. wind according to claim 1, do, long pause layer construction technology under heat and the high evaporation environment, it is characterized in that: the thickness of described cement paste is 3mm, the thickness of described mortar is 1.5cm.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110409609A (en) * | 2019-07-18 | 2019-11-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of casting method of overlength interval concrete crack resistence |
| CN112759315A (en) * | 2020-12-21 | 2021-05-07 | 中国水利水电第九工程局有限公司 | Construction method for dynamically controlling VC value of roller compacted concrete under complex weather condition |
| CN115369823A (en) * | 2022-08-22 | 2022-11-22 | 中国水利水电第十一工程局有限公司 | Roller compacted concrete interlayer surface treatment method |
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| CN101319494A (en) * | 2008-07-22 | 2008-12-10 | 安蓉建设总公司 | Concrete construction method for extreme cold area in low temperature season |
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| CN110409609A (en) * | 2019-07-18 | 2019-11-05 | 中交武汉港湾工程设计研究院有限公司 | A kind of casting method of overlength interval concrete crack resistence |
| CN110409609B (en) * | 2019-07-18 | 2020-10-02 | 中交武汉港湾工程设计研究院有限公司 | Pouring method for preventing concrete from cracking in ultra-long interval period |
| CN112759315A (en) * | 2020-12-21 | 2021-05-07 | 中国水利水电第九工程局有限公司 | Construction method for dynamically controlling VC value of roller compacted concrete under complex weather condition |
| CN115369823A (en) * | 2022-08-22 | 2022-11-22 | 中国水利水电第十一工程局有限公司 | Roller compacted concrete interlayer surface treatment method |
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Application publication date: 20110817 |