CN102153366A - Process for effectively and dynamically controlling VC (Vibration-Compaction Index) value of concrete under wind, dry, hot and high-evaporation environments - Google Patents
Process for effectively and dynamically controlling VC (Vibration-Compaction Index) value of concrete under wind, dry, hot and high-evaporation environments Download PDFInfo
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- CN102153366A CN102153366A CN2010105882575A CN201010588257A CN102153366A CN 102153366 A CN102153366 A CN 102153366A CN 2010105882575 A CN2010105882575 A CN 2010105882575A CN 201010588257 A CN201010588257 A CN 201010588257A CN 102153366 A CN102153366 A CN 102153366A
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Abstract
The invention provides a process for effectively and dynamically controlling a VC (Vibration-Compaction Index) value of concrete under wind, dry, hot and high-evaporation environments. The process comprises the main steps of controlling a VC value of a roller compacted concrete outlet at 1-3 s and a field VC value at 3-6 s; preferably, spraying and wetting an aggregate for preparing the roller compacted concrete in advance; controlling the time for transporting, unloading and spreading and rolling the concrete within 30 minutes; and preparing enough spray equipment to cover the whole spreading area in a bin. Through the process for effectively and dynamically controlling the VC (Vibration-Compaction Index) value of the concrete under wind, dry, hot and high-evaporation environments, which is provided by the invention, the cohesiveness of a roller compacted concrete mixture, the aggregate separation situation, the setting time, the liquefied bleeding quality and roller compaction ability are largely improved, the construction progress is accelerated, various adverse effects on the roller compacted concrete due to raw materials and the weather conditions like wind, dryness, hotness, high-evaporation and the like are overcome, and interlayer combination, impermeability and overall performance are increased.
Description
Technical field
The present invention relates to concrete VC value CONTROL PROCESS in the grinding concrete dam technology, specifically, relate to a kind of wind, do, the effectively dynamic CONTROL PROCESS of concrete VC value under heat and the high evaporation environment.
Background technology
Along with the development of grinding concrete dam technology, advanced design concept, deep experimental study and a large amount of construction practical experiences make to the understanding of roller compacted concrete VC value progressively ripe." the water conservancy project grinding concrete construction standard " of China passed through to such an extent that revision has just directly reflected VC value value change procedure.SDJ-86 " water conservancy project grinding concrete construction temporary provisions " regulation VC value is 20 ± 5s; SL53-94 " water conservancy project grinding concrete construction standard " regulation machine mouth VC value should be selected for use in 5～15s scope; The design effort degree (VC value) of DL/T5112-2000 " water conservancy project grinding concrete construction standard " regulation roller compacted concrete mix can be selected 5～12s for use, machine mouth VC value should change according to the weather condition of working-yard, dynamically select for use and control, scope can be in 5～12s.
In construction process, the factor that influences the VC value is many, mainly is the combination of multiple meteorological conditions, has constituted the envrionment conditions of more complicated.Particularly at wind, do, under heat and the high evaporation environment, the VC value is more vulnerable to influence, it is particularly important that the VC value is control effectively.Described wind, do, the area at heat and high evaporation environment place is the aridity weather, particularly, for example have following characteristics: year temperature difference is higher than 60 ℃; Mean wind speed is higher than 1.5m/s for many years, and maximum wind speed 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 time is more than 2700h.Directly according to " water conservancy project grinding concrete construction standard " control VC value also be not enough to satisfy wind, do, rcc dam construction specification of quality under heat and the high evaporation environment, be necessary to study wind, do, the effective dynamic CONTROL PROCESS of concrete VC value under heat and the high evaporation environment.
Summary of the invention
The purpose of this invention is to provide a kind of wind, do, the effectively dynamic CONTROL PROCESS of concrete VC value under heat and the high evaporation environment.
Wind provided by the invention, do, the effectively dynamic CONTROL PROCESS of concrete VC value is under heat and the high evaporation environment: roller compacted concrete machine outlet VC value is controlled at 1s～3s, and on-the-spot VC value is controlled at 3s～6s.
Preferably, in advance the aggregate of preparing described roller compacted concrete is sprayed moisteningly, described spray is moistening to be comprised to the spray of aggregate stock pile with to the spray of the aggregate on the rotary conveyor that enters batching plant.
Preferably, concrete from go out transportation, discharging behind the machine, paving begins the time of rolling and is controlled in 30 minutes.
Preferably, be equipped with enough spraying equipment, cover the area that all paves in the storehouse, increase humidity in the storehouse; Secondly, the roller compacted concrete after paving in time covers with protective cloth, reduces moisture loss, keeps the VC value constant substantially.Described spraying equipment is preferably the spraying machine that nominal flow rate is 50～75L/min.
Wind provided by the invention, do, the effectively dynamic CONTROL PROCESS of concrete VC value has greatly been improved the roller compacted concrete mix under heat and the high evaporation environment cohesiveness, Segregation situation, time of coagulation, liquefaction bleeding and stone roller property, accelerated construction speed, solved starting material and wind, done, weather condition such as heat, high evaporation are to the various disadvantageous effects that roller compacted concrete produces, and have improved interlayer combination, anti-permeability performance and overall performance.
Embodiment
Below by specific embodiment the present invention is further specified.The wind that describes below, do, the effectively dynamically CONTROL PROCESS of concrete VC value is that the Xinjiang noise made in coughing or vomiting is cured moulds employed technology when restraining the hydro project Compacted Concrete Gravity Dam Section building under heat and the high evaporation environment.Fuhai County and Fuyun County that the cured construction site of moulding gram hydro 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 physical 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 year temperature difference 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 speed 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 a steam output, 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 time 2864.5h.
Roller compacted concrete is built the P.O42.5 that the cement that uses is produced as the cement mill, 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 quality grade 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 reducer that roller compacted concrete is built use is the PMS-3A efficient retarding and water reducing agent of Xinjiang five outstanding Industry investment company limited, and product batch number is H07062205.Every detection data see Table 3.
Table 3 water reducer detection statistics table
Fine aggregate 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
| Water ratio (%) | Silt content (%) | Clod content (%) | Fineness modulus |
| 5.6-5.8 | 1.2 | 0 | 2.66-2.70 |
Coarse aggregate adopts the artificial rubble of gneissose 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 mean values, every detection data see Table 6.
Table 6 machine mouth concrete mix temperature control cartogram
| 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 mean values 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 cartogram
Roller compacted concrete is built 3 kinds of proportionings of common use, and design grade is respectively R
180150F50W4, R
180200F300W10, R
180200F200W6, ultimate compression 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 ultimate compression strength detected value table
By above to roller compacted concrete starting material and mix detection case as can be known, the every performance index of starting 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 loaded concrete is all taked initial stage water flowing cooling, single water-cooled tube length 200m, and the water-cooled tube spacing is 1.5 * 1.5m; Water coolant total amount by single every water-cooled tube is 1.2m
3/ h, initial stage cooling 12h after the concrete placement begins water flowing; The temperature of cooling water of water-cooled tube ingress remains on about 15 ℃, and be 20d cooling 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 temperature of cooling water of water-cooled tube ingress remains on about 10 ℃, be 10d cooling time.The intact rear surface of concrete placement adopts the thick XPS extruded sheet lagging material of 10cm to carry out the insulation whole year.
The cured gram hydro project Compacted Concrete Gravity Dam Section of moulding of noise made in coughing or vomiting carries out having built the thick lid loaded concrete of 3m earlier before the consolidation grouting, and concrete strength carries out consolidation grouting after satisfying the consolidation grouting requirement.This Compacted Concrete Gravity Dam Section crest elevation 745.50m, maximum height of dam 49.5m; Monolith width along the dam axis direction is 20m, maximum bottom width 37.50m.
Roller compacted concrete VC value span of control is as shown in table 9 under the various environment, gets low value under the situation that fine solar radiation is strong, wind speed is big, gets high value under the situation at cloudy day.
Roller compacted concrete VC value span of control under the various environment of table 9
Quantity of precipitation is few, and relative humidity of atomsphere is low, the wind speed that the exsiccant air is bigger in addition, the moisture loss highly significant of concrete surface.Roller compacted concrete after paving, if leave standstill 10 minutes, concrete surface will be grey.In order to guarantee the desired VC value of concrete of putting in storage, the spraying machine of two nominal flow rate 70L/min is purchased in the working-yard, sprays in real time according to weather condition, reaches cooling, preserves moisture, the moisturizing purpose.
Having the expert to watch spraying back to the scene just proposes: such spray effect is not spraying but spray may change concrete water-cement ratio, and then changes the VC value.In order to verify whether spraying changes water-binder ratio, afternoon on May 16th, 2008, carry out spray testing at 1+040～1+080 position, the purpose of test mainly be want to simulate roller compacted concrete put in storage VC value behind the parked certain hour in back loss and spray to the influence of concrete VC value.
Test is selected in 9m in the storehouse
2In the scope, sampling depth is in the surperficial 10cm scope.The roller compacted concrete that will pave during test was placed 10 minutes, 20 minutes naturally, measured its VC value and water ratio; Keep the water smoke free-falling during spraying, the time is chosen to be 10 minutes and 20 minutes, measures its VC value and water ratio equally.Test-results sees Table 10.
Parked 10 minutes is 2.9s with parked 20 minutes VC value differences, and the 20 minutes VC value differences of spraying 10 minutes and sprayed are 0.1s.Test-results shows: roller compacted concrete VC value can not reduce because of spraying, the moisture that the moisture that spraying increases to concrete loses less than spontaneous evaporation.Test-results has proved that fully spraying is to keeping the constant importance of the best VC value of concrete of putting in storage.
The on-the-spot spray testing data statistic of table 10
Noise made in coughing or vomiting is cured, and what mould that the gram Compacted Concrete Gravity Dam Section uses is washing natural sand, the artificial rubble of gneissose granite.Washing natural sand water ratio is more stable, and fluctuation is little, and is little to the influence of concrete VC value.Artificial rubble mainly contains two portions supply and produces: a part is just to have produced by conveyor to be transported to virgin aggregates on the batching plant, and water ratio is big; A part is a standby material, is air-dry aggregate, and water ratio is less.If the aggregate of aggregate production line supply can not satisfy the production needs, just enable standby aggregate.The aggregate of doing, wet is used alternatingly, and changes in one day frequently, and the fluctuation of roller compacted concrete mix machine outlet VC value is very big, is difficult to accurate the control.
At the local climate feature, formulated the real-time management measure, look execution conditions and scene stone roller property is adjusted.For guaranteeing the workability of roller compacted concrete mix, meet design requirement, saturation state in view of local climate condition and aggregate, require batching plant test in per 2 hours water ratio once, pay attention to the computational analysis of the loss water yield, carry out moisturizing at the concrete blending station by the loss water yield, and set up the dynamic real-time control measures according to climatic conditions change.Formulate relative measures at influence factor.
The measure of taking greatly at day temperature height, wind speed: pay attention to mobilization, avoid the construction of high temperature period on daytime as far as possible, generally arrange to open a position night and build.If construction is by day taked to add a cover sunshade cloth, the increasing aggregate is stored up highly and is set up puggaree to reduce the loss of concrete temperature rise and VC value on automobile.Strict control concrete warehousing speed, require concrete from go out transportation, discharging behind the machine, paving begins the time of rolling and is controlled in 30 minutes, reduces the loss of VC value as far as possible, with the damage control in 1s.
The measure low at relative humidity, that steam output is taked greatly: at first be equipped with enough spraying equipment, cover the area that all paves in the storehouse, increase humidity in the storehouse, reduce steam output; Secondly, the roller compacted concrete after paving in time covers with protective cloth, reduces moisture loss, keeps the VC value constant substantially.
Aggregate is used alternatingly the measure of taking at doing, wetting: at first set up sprinkling equipment on stock pile, it is moistening that aggregate is absorbed water in advance, because stockpile is bigger, the part aggregate does not have trickle moistening, automatic spray conduit is installed on rotary conveyor at last, is made the aggregate that enters batching plant keep moisture state.
By above measure can realize wind, do, concrete VC value effectively dynamically controls under heat and the high evaporation environment.
Utilize above-mentioned technology to guarantee that roller compacted concrete rolls quality.Concrete detected result is as follows:
(1) roller compacted concrete intensity detection statistics: inner roller compacted concrete R180150W4F50 takes a sample 1693 groups, concrete strength maximum value 45.1Mpa, minimum value 20.9Mpa; Outside roller compacted concrete R180200W10F300 takes a sample 420 groups, concrete strength maximum value 54.1Mpa, minimum value 29.9Mpa; Outside roller compacted concrete R180200W6F200 takes a sample 365 groups, concrete strength maximum value 45.9Mpa, minimum value 33.7Mpa; Inner roller compacted concrete R180200W10F100 takes a sample 123 groups, concrete strength maximum value 48.5Mpa, minimum value 26.7Mpa.
(2) freeze proof label detection statistics: the freeze proof label of R180150F50W4 detects 28 groups, mass loss scope 0.4%-4.4%, and mould changing value 68.6%-88.3% moves; The freeze proof label of R180200W10F100 detects 2 groups, mass loss scope 3.7%-4.7%, and mould changing value 70.6%-81.4% moves; The freeze proof label of R180200F300W10 detects 26 groups, mass loss scope 1.6%-2.53%, and mould changing value 77.1%-87.0% moves.
(3) anti-penetration grade detection statistics: the R180150F50W4 anti-penetration grade detects 21 groups, all＞and W4; The R180200W10F100 anti-penetration grade detects 2 groups, all＞and W10; The R180200F300W10 anti-penetration grade detects 15 groups, all＞and W10; The R180200F200W6 anti-penetration grade detects 14 groups, all＞and W6.
(4) get the core situation: 1) roller compacted concrete core taking inspection situation to building in 2007 years: diameter 220mm core length overall 95.4m, core obtains rate 100%, bonding surface serviceability rate 98.6%; Diameter 171mm core length overall 87.42m, core obtains rate 100%, bonding surface serviceability rate 98.0%; 2) the roller compacted concrete core taking inspection situation to building in 2008 years: core diameter 220mm, core length overall 199.79m, core obtains rate 100%, bonding surface serviceability rate 98.1%; Core diameter 171mm, core length overall 339.38m, core obtains rate 100%, bonding surface serviceability rate 96.5%.3) core length 16.46m (the core effective diameter that drilled through on April 25th, 2009
), comprised 5 construction joint faces altogether, 54 are rolled aspect; Core length 16.55m (the core effective diameter that on April 30th, 2009 drilled through
), comprised 5 construction joint faces altogether, 54 are rolled aspect.Core smooth surface, densification, aggregate is evenly distributed, and the core integrity is good, and this core obtains enterprise's new record.
(5) water pressure test inspection: arranged 9 setting-out inspection windows altogether, average permeability rate 0.41Lu shows that the grinding concrete construction quality meets design requirement.
In above-mentioned processing method and the detection method, the concrete steps of Xiang Ximiaoshuing are not all operated according to DL/T5112-2000 " water conservancy project grinding concrete construction standard ".
Claims (5)
- Wind, do, the effectively dynamic CONTROL PROCESS of concrete VC value under heat and the high evaporation environment, it is characterized in that roller compacted concrete machine outlet VC value is controlled at 1s～3s, on-the-spot VC value is controlled at 3s～6s.
- 2. wind according to claim 1, do, the effectively dynamic CONTROL PROCESS of concrete VC value under heat and the high evaporation environment, it is characterized in that, in advance the aggregate of preparing described roller compacted concrete is sprayed moisteningly, described spray is moistening to be comprised to the spray of aggregate stock pile with to the spray of the aggregate on the rotary conveyor that enters batching plant.
- 3. wind according to claim 1, do, the effectively dynamic CONTROL PROCESS of concrete VC value under heat and the high evaporation environment, it is characterized in that, concrete from go out transportation, discharging behind the machine, paving begins the time of rolling and is controlled in 30 minutes.
- 4. wind according to claim 1, do, the effectively dynamically CONTROL PROCESS of concrete VC value under heat and the high evaporation environment, it is characterized in that, is equipped with enough spraying equipment, the area that all paves in the covering storehouse, humidity in the increase storehouse; Secondly, the roller compacted concrete after paving in time covers with protective cloth, reduces moisture loss, keeps the VC value constant substantially.
- 5. wind according to claim 4, do, the effectively dynamic CONTROL PROCESS of concrete VC value under heat and the high evaporation environment, it is characterized in that described spraying equipment is that nominal flow rate is the spraying machine of 50～75L/min.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104960088A (en) * | 2015-06-16 | 2015-10-07 | 乌海市公路工程有限公司 | Method for improving curve box girder appearance quality in high-temperature-difference region |
| 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 |
| CN115030110A (en) * | 2022-07-15 | 2022-09-09 | 中电建十一局工程有限公司 | Construction method for dynamically controlling VC value of roller compacted concrete under high-altitude complex environment condition |
-
2010
- 2010-12-14 CN CN2010105882575A patent/CN102153366A/en active Pending
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| 张波: "新疆喀腊塑克碾压混凝土重力坝施工技术", 《陕西水利》 * |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104960088A (en) * | 2015-06-16 | 2015-10-07 | 乌海市公路工程有限公司 | Method for improving curve box girder appearance quality in high-temperature-difference region |
| 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 |
| CN115030110A (en) * | 2022-07-15 | 2022-09-09 | 中电建十一局工程有限公司 | Construction method for dynamically controlling VC value of roller compacted concrete under high-altitude complex environment condition |
| CN115030110B (en) * | 2022-07-15 | 2024-02-13 | 中电建十一局工程有限公司 | Construction method for dynamically controlling VC value of roller compacted concrete under high-altitude complex environment condition |
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Application publication date: 20110817 |