CN110053127A - Can shake can grind low VC value concrete and its design method - Google Patents
Can shake can grind low VC value concrete and its design method Download PDFInfo
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- CN110053127A CN110053127A CN201910258660.2A CN201910258660A CN110053127A CN 110053127 A CN110053127 A CN 110053127A CN 201910258660 A CN201910258660 A CN 201910258660A CN 110053127 A CN110053127 A CN 110053127A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B1/00—Producing shaped prefabricated articles from the material
- B28B1/04—Producing shaped prefabricated articles from the material by tamping or ramming
- B28B1/045—Producing shaped prefabricated articles from the material by tamping or ramming combined with vibrating or jolting
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Abstract
Can shake the invention discloses one kind can grind low VC value concrete and its design method, and the workability VC value of the concrete is 0~3s.Specific design method the following steps are included: 1) carry out Roller Compacted Concrete Dam mix proportion test, make concrete items mixture parameter meet can roller compaction construction needs, VC value is between 3s~7s, air content 3%~5%；2) sand coarse aggregate ratio of step 1) Roller Compacted Concrete Dam mix proportion is lowered, Roller Compacted Concrete Dam mix proportion other parameters change accordingly, until grinding coagulation soil mixture VC value decreases to 0s~3s, low VC value concrete can be ground by obtaining to shake.This concrete mix is after lift surface paves, and rolling operation bleeding speed is fast, and liquefaction effect is obvious, and easily close degree is high；The vibrating spear for manually holding 100 or more Φ vibrates, and is not required to add mortar direct tamping again, effect of vibrating is good, and concrete surface is smooth after demoulding, and stomata is few, and density is good.Process can be simplified and accelerate progress, moreover it is possible to promote concrete construction quality.
Description
Technical field
The invention belongs to concrete fields, and specially one kind, which can shake, can grind low VC value grinding coagulation soil and its design method.
Background technique
The continuous Coating combination quality and template periphery concrete construction quality for rising layer of grinding coagulation soil is grinding coagulation soil
The difficult point of quality control on construction.Template periphery construction at present generallys use net by addition cement in grinding coagulation soil mixture
Slurry vibrates, and Recent study promotes micro- slump or zero slump concrete, mechanism abnormal concrete etc., though pass through these
Method improves the uniformity of concrete and improves construction effect, but increases xenogenesis concrete speading process, construction management
It is increased with quality control difficulty, controllability is poor.
Summary of the invention
Can shake in order to solve the above technical problem, the present invention provides one kind can grind low VC value concrete and its design method,
Hand-held vibrating spear vibration compacting had not only can be used in the concrete, but also can be normally carried out rolling operation.Compared to conventional grinding coagulation Tu Cang
Surface construction, abnormal region, the construction of xenogenesis concrete region can simplify working procedure, accelerate construction without adding slurry direct tamping
Progress；It is abundant to roll rear concrete surface bleeding, there is one layer of thin layer suede slurry on surface, ties between rising layer by layer conducive to grinding coagulation soil is continuous
It closes, and the performance of concrete is better than conventional grinding coagulation soil.
The technical solution adopted by the present invention is that can shake can grind low VC value concrete, its VC value of the concrete is 0-3s.
Further, the mix-design of the concrete is according to " mix proportion of concrete design discipline " DL T5330-
2015 requirement design, workability is between normal concrete and grinding coagulation soil.Testing concrete performance is according to " water conservancy project
Grinding coagulation soil testing regulations " (DL/T5433-2009) progress.
Further, the sand coarse aggregate ratio of the concrete is between normal concrete and grinding coagulation soil, and water consumption is compared to stone roller
Concrete water amount is pressed to increase by 2~3kg/m3。
Further, when carrying out roller compaction construction using the concrete, the concrete mix thickness that paves to 35 ± 2cm,
When using BW202AD vibroroller cmpacting equipment operation, the vibrating roller speed of travel controls the amplitude 0.74 within the scope of 1.0~2.0km/h
~0.36HZ, after number of rolling is 2 times static pressure and 6 times vibroroller cmpactings, coagulation soil compaction meets code requirement.
Further, using the concrete vibrate operation when, the vibrating spear of 100 or more man-hour manually hand-held Φ, vibrate 2s
~4s starts bleeding, reaches closely knit in 1min.
The invention further relates to described shake can grind the design method of low VC value concrete, comprising the following steps:
1) carry out Roller Compacted Concrete Dam mix proportion test, make concrete items mixture parameter meet can roller compaction construction needs,
VC value is between 3s~7s, air content 3%~5%；
2) set-up procedure 1) Roller Compacted Concrete Dam mix proportion sand coarse aggregate ratio, under grinding coagulation soil other parameters permanence condition, drop
Low 2%~3% sand coarse aggregate ratio, until grinding coagulation soil mixture VC value decreases to 0s~3s, low VC value can be ground by obtaining to shake
Concrete.
Further, the VC value that adjustment sand coarse aggregate ratio is not able to satisfy concrete is adjusted in 0-3s by increasing water consumption
The whole VC value to concrete is met the requirements.
The invention further relates to the applications shaken and can grind low VC value concrete in Construction for Hydroelectric Project.
The present invention roll concrete items mixture parameter satisfaction can and be applied based on benchmark Roller Compacted Concrete Dam mix proportion
Work needs, then low VC value Roller Compacted Concrete Dam mix proportion parameter adjustment is carried out on the basis of Roller Compacted Concrete Dam mix proportion, passes through downward
Sand coarse aggregate ratio makes have more free slurries in grinding coagulation soil mixture, has grinding coagulation soil under gravity and effect of vibration
Certain rheological characteristic, and construction equipment normal operation is unaffected.Since sand coarse aggregate ratio is lowered, Roller Compacted Concrete Dam mix proportion other parameters
Can generate corresponding variation, coarse aggregate dosage increases compared with grinding coagulation soil, aggregate total surface area decline in concrete, cement slurry compared with
Rich before adjusting, free stock body increases in concrete mix, and pulp layer thickens around particles of aggregates in mixture, without adding cement
Mortar can direct tamping；Further, since coarse aggregate dosage increases, thick bone dosage increases before relatively adjusting in concrete, coagulation
There are the increase of the mechanical snap power of coarse aggregate in native mixture, it can effectively increase grinding coagulation soil mixture load bearing equipment on it
The ability of normal operation.
Beneficial effects of the present invention:
1, can shake can grind low VC value concrete constructs in abnormal region, after paving without grooving, dig pit plus slurry etc. operation and
Direct tamping, bleeding effect of vibrating is good, simplifies working procedure；Grinding coagulation soil is in+6 times vibroroller cmpactings of 2 times static pressure with regard to complete
Meet compaction requirement, reduce by 2 times vibroroller cmpactings compared with grinding coagulation soil, cancel the last 2 times static pressure of tradition, amounts to and reduce by No. 4 stone rollers
Press pass.
2, can shake, which can grind low VC value concrete, solves abnormal region and rolls region overlapping part because adding slurry to cause Hard Roll
The problem of bulge；Can shake can grind liquefaction bleeding effect it is obvious, surface suede slurry be conducive to continuously rise layer Coating combination.
3, can shake can grind low VC value concrete, so that concrete mix is sticked poly- property stronger, coarse aggregate surface is glutinous gathered it is more
Cement mortar, grinding coagulation soil mixture big coarse aggregate in discharging, paving process is not readily separated, and preferably resolves big thick
Aggregate separated is not easy in concrete to form aggregate and makes somebody a mere figurehead phenomenon.
4, can shake grind low VC value concrete and solve adds slurry unevenly to cause concrete strength and heat of hydration temperature rise in phase
With the problem that position difference is larger.
5, can shake can grind low VC value concrete because, there are more free slurry, concrete 's air-containing is mainly deposited in mixture
It is in cement slurry, free slurry is not easy to disperse in transport, paving process, the long period can keep concrete mix
Air content, concrete durability are more guaranteed.
6, can shake can grind low VC value concrete construction, greatly improve the construction order of rolled concrete cylinder surface, reduce
Security risk.
Detailed description of the invention
Fig. 1 can shake for the present invention can grind low VC value concrete roller compaction construction effect picture.
Fig. 2 and Fig. 3 is to be vibrated construction effect figure using concrete metamorphosis of the present invention area scene.
Specific embodiment
Below with reference to embodiment, the present invention is furture elucidated.
Can shake can grind the design method of low VC value concrete, design considerations " mix proportion of concrete design discipline " into
Row, first progress Roller Compacted Concrete Dam mix proportion test, make concrete items mixture parameter meet can roller compaction construction needs, then
Low VC value Roller Compacted Concrete Dam mix proportion parameter adjustment, concrete operation step are carried out on the basis of Roller Compacted Concrete Dam mix proportion are as follows:
Benchmark Roller Compacted Concrete Dam mix proportion, VC value is generally between 3s~7s, air content 3%~5%, it is assumed that passes through test
Determining optical sand percentage is 35%, adjusts sand coarse aggregate ratio, and low VC value concrete is lowered on the basis of Roller Compacted Concrete Dam mix proportion sand coarse aggregate ratio
2%~3% sand coarse aggregate ratio, after lowering 2%~3% sand coarse aggregate ratio, Roller Compacted Concrete Dam mix proportion other parameters change accordingly, coarse aggregate dosage
Increase compared with grinding coagulation soil, the decline of aggregate total surface area, cement slurry is rich before relatively adjusting, and dissociates in concrete mix
Slurry increases, and pulp layer thickens around particles of aggregates in mixture, and grinding coagulation soil mixture VC value decreases to 0s~3s, contains
Tolerance increases by 1% or so, and low VC value concrete can be ground by obtaining to shake.2% is lowered on the basis of conventional Roller Compacted Concrete Dam mix proportion
~3% sand coarse aggregate ratio, when VC value is reduced to 0~3s, which is substantially that can shake that concrete mix sand coarse aggregate ratio can be ground, if passing through tune
When whole sand coarse aggregate ratio is not able to satisfy 0~3sVC value still, it need to increase by 2~4kg/m3Water consumption meets VC to 0~3s.In addition, due to thick bone
Expect that dosage increases, thick bone dosage increases before relatively adjusting in concrete, and there are the mechanical snap power of coarse aggregate in concrete mix
Increase, can effectively increase the ability of grinding coagulation soil mixture load bearing equipment normal operation on it.
Can shake can grind low VC value grinding coagulation soil mixture Properties Control: machine outlet concrete VC 0~3s of value, air content 3
~5%；2~5s of live VC value.
Low VC value concrete mix can be ground by shaking for above-mentioned Mix Ratio Test method acquisition, is both needed to live foundation
General provisions 4.0.2 proving test in " water conservancy project grinding concrete construction specification " (DLT 5112-2009), tests compactness and rolls
Pass relationship, bleeding time of vibrating, pave after residence time and vibrate bleeding time relationship and range estimation rolling apparatus operation and fortune
The bearing capacity of transfer device.
Embodiment: certain engineering, which can shake, can grind low VC value C9015W6F50 three-graded concrete, C9020W10F50 graduation two is ground
Press-fit ratio and Roller Compacted Concrete Dam mix proportion and normal concrete match ratio example see the table below 1.
Table 1, which can shake, can grind low VC value, grinding coagulation soil, normal concrete Stock allotment right
C in table 19015W6F50 low VC and C90Two groups of the low VC of 20W10F50 is that can to grind low VC value mixed for of the invention shaking
Solidifying soil.
Specific field test are as follows:
1, can shake can grind low VC value concrete number of rolling, compactness, the test of surface bleeding thickness
To paving, smooth concrete mix is rolled:
(1) bleeding is tested:
1. testing since vibroroller cmpacting the 1st time, there must be 50% surface to start bleeding vibroroller cmpacting the 1st time,
2. the 2nd time palpus 80% of vibroroller cmpacting rolls face bleeding,
3. the 3rd time 90% compression face bleeding of palpus of vibroroller cmpacting,
4. the 4th time compression face whole bleeding of vibroroller cmpacting.
(2) compactness is tested:
Start for vibroroller cmpacting the 4th time to test compactness, until the 6th time compactness meets code requirement.
(3) it rolls facing surface suede slurry to be tested, suede slurry thickness must have in+6 times vibrating rollers of number of rolling 2 times quiet stone rollers
5mm~8mm or so.
2, can shake can grind low VC value concrete vibrating bleeding time test
Test method 1:
Test uses stopwatch, and the vibrating spear of 100 or more man-hour manually hand-held Φ, insertion, which can shake, can grind concrete layer 50cm, nucleon
Density Moisture Meter test density, test vibrate and start bleeding time and completely dense required time, with concrete surface after vibrating
Subject to no air pocket overflows.Start the bleeding time in 4s or so, reaches closely knit within 1min clock.High temperature period, night and yin
The loss of rainy day VC value needs to consider, determines that the control of machine outlet VC value is done and dynamically adjust, vibrated concrete terminates preferably from paving to vibrating
It is completed in 40min.
Test method 2: production 1000 × 1000 × 1000mm square transparent glass die trial is shaken what is mixed and can be ground
Low VC value concrete mix is packed into die trial in two times, cleans die trial appearance surface concrete, using 100 vibrating spear of Φ 80 or Φ
Vibrated concrete overflows time measuring and calculating vibration compacting required time by observing template periphery concrete bubble completely.
It can grind low VC value concrete using provided by the invention shake and construct, roller compaction construction effect picture is shown in Fig. 1, specifically
The construction effect figure that vibrates can be found in Fig. 2 and Fig. 3.
Low VC value concrete can be ground using that can shake, is applied in hydraulic and hydroelectric engineering grinding concrete construction, by adjusting
Roller Compacted Concrete Dam mix proportion parameter, mainly adjustment sand coarse aggregate ratio reduce grinding coagulation soil VC value to 0~3s, make in grinding coagulation soil
There are more free slurries, there is certain rheological characteristic under gravity and effect of vibration.This grinding coagulation soil mixture is pouring
It builds after storehouse surface paves, rolling operation bleeding speed is fast, and liquefaction effect is obvious, and easily close degree is high；Manually hold 100 or more Φ's
Vibrating spear vibrates, and is not required to add mortar direct tamping again, effect of vibrating is good, and concrete surface is smooth after demoulding, and stomata is few, closely knit
Property is good.Have simplified working procedure, improve construction efficiency, accelerate construction progress, performance is better than the performance of conventional grinding coagulation soil,
It enhances concrete mix simultaneously and sticks poly- property, effectively cementing aggregate preferably solves aggregate separated, is not easy to form aggregate frame
Grinding concrete construction quality can be effectively ensured in sky.
The above embodiments are only the preferred technical solution of the present invention, and are not construed as limitation of the invention, this hair
Bright protection scope should be with the technical solution of claim record, technical characteristic in the technical solution recorded including claim
Equivalents are protection scope.Equivalent replacement i.e. within this range is improved, also within protection scope of the present invention.
Claims (8)
1. can shake can grind low VC value concrete, it is characterised in that: its VC value of the concrete is 0~3s.
2. concrete according to claim 1, it is characterised in that: the mix-design of the concrete is according to " water conservancy project coagulation
Native mix-design regulation " DL T5330-2015 requirement design, workability is between normal concrete and grinding coagulation soil
Between.
3. concrete according to claim 1, it is characterised in that: the sand coarse aggregate ratio of the concrete is between normal concrete and rolls
Between concrete, water consumption increases by 2~3kg/m compared to grinding coagulation soil water consumption3。
4. concrete according to claim 1, it is characterised in that: when carrying out roller compaction construction using the concrete, pave this
Concrete mix thickness is to 35 ± 2cm, and when using BW202AD vibroroller cmpacting equipment operation, the control of the vibrating roller speed of travel exists
Within the scope of 1.0 ~ 2.0km/h, 0.74 ~ 0.36HZ of amplitude, number of rolling is coagulation soil pressure after 2 times static pressure and 6 times vibroroller cmpactings
Solidity meets code requirement.
5. concrete according to claim 1, it is characterised in that: using the concrete vibrate operation when, artificial hand
The vibrating spear of 100 or more Φ is held, the 2s~4s that vibrates starts bleeding, reaches closely knit in 1min.
6. can shake described in claim 1-5 any one can grind the design method of low VC value concrete, which is characterized in that including with
Lower step:
1) carry out Roller Compacted Concrete Dam mix proportion test, make concrete items mixture parameter meet can roller compaction construction needs, VC value
Between 3s~7s, air content 3%~5%；
2) set-up procedure 1) Roller Compacted Concrete Dam mix proportion sand coarse aggregate ratio, under grinding coagulation soil other parameters permanence condition, reduce by 2%
~3% sand coarse aggregate ratio, until grinding coagulation soil mixture VC value decreases to 0s~3s, low VC value concrete can be ground by obtaining to shake.
7. according to the method described in claim 6, it is characterized by: adjustment sand coarse aggregate ratio is not able to satisfy the VC value of concrete in 0~3s
When, it is met the requirements by increasing water consumption come the VC value being adjusted to concrete.
8. can shake the application that can grind low VC value concrete in Construction for Hydroelectric Project described in claim 1-5 any one.
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| CN201910258660.2A CN110053127A (en) | 2019-04-01 | 2019-04-01 | Can shake can grind low VC value concrete and its design method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110879190A (en) * | 2019-12-04 | 2020-03-13 | 中国水利水电科学研究院 | Portable working degree tester and testing method for working degree of cemented sand gravel |
| 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 |
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Application publication date: 20190726 |