CN101936867A - Method for measuring uniformity and cohesiveness of concrete mixture - Google Patents

Method for measuring uniformity and cohesiveness of concrete mixture Download PDF

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Publication number
CN101936867A
CN101936867A CN 201010256456 CN201010256456A CN101936867A CN 101936867 A CN101936867 A CN 101936867A CN 201010256456 CN201010256456 CN 201010256456 CN 201010256456 A CN201010256456 A CN 201010256456A CN 101936867 A CN101936867 A CN 101936867A
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concrete mix
hopper
homogeneity
property
coaster
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CN101936867B (en
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杨文�
王军
孙克平
赵日煦
吴静
吴雄
梅群
代瑞平
于振猛
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China Construction Ready Mixed Concrete Co Ltd
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China Construction Third Engineering Bureau Co Ltd
China Construction Ready Mixed Concrete Co Ltd
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Abstract

The invention relates to a method for measuring uniformity and cohesiveness of a concrete mixture, which is characterized by comprising the following steps of: (1) preparing a device for measuring the uniformity and the cohesiveness of the concrete mixture; (2) making a pulley of the device for measuring the uniformity and the cohesiveness of the concrete mixture be in an initial position, filling the concrete mixture into a hopper, and sliding the pulley along a track at a constant speed so that the concrete mixture drops into a material groove from the hopper; and counting the number n of material boxes dropped with the concrete mixture to represent the cohesiveness of the concrete mixture, wherein the greater the value n is, the greater the cohesiveness of the concrete mixture is; and (3) weighing the weight of the material boxes dropped with the concrete mixture one by one, and calculating the uniformity of the concrete mixture according to a dispersion coefficient formula, wherein the greater CV (Coefficient Of Variation) is, the worse the uniformity of the concrete mixture is. The invention has the characteristics of convenient and quick use, and can measure the uniformity and the cohesiveness of the concrete mixture at the same time.

Description

Measure concrete mix homogeneity and glutinous method of gathering property
Technical field
The invention belongs to the concrete test field, be specifically related to a kind of concrete mix homogeneity and glutinous method of gathering property measured.
Background technology
Concrete is the most widely used building materialss of modern times, also is the most large current artificial material.Concrete by each composition material by a certain percentage mix become, as yet not setting and harden the time be called concrete mix, the sclerosis back claims maturing.The main character of concrete mix is flowability, homogeneity, glutinous poly-property etc.
Flowability is meant that concrete mix under the effect that dead weight or construction machinery vibrate, can produce the performance that flows and evenly fill up template densely, and mobile quality directly influences the Concrete Construction complexity.Homogeneity is meant the degree of uniformity that each component distributes between the different unit volume concrete, and the quality of homogeneity directly influences the quality of concrete situation.Glutinous poly-property is meant that concrete mix has certain cohesive strength between its composition material in work progress, unlikely generation laminated segregation, and the quality of glutinous poly-property affects concrete flowability and homogeneity again.
Along with the speed of application of building operation is more and more faster, preparation of construction is more and more advanced, it is pumping construction that a large amount of Concrete Construction all requires, but pump concrete is when having advantages such as continuous placing, efficient height, saving labour, to concrete flowability, homogeneity and all relevant higher requirement of glutinous poly-property.Yet at present a lot of workmens more pay close attention to concrete flowability, wish to use mobile very big concrete, and have often ignored concrete homogeneity and glutinous poly-property.
Concrete with large fluidity helps concrete and realizes pumping construction, can reduce the pump pressure of pump machine, also be beneficial to after concrete pump is delivered to the constructing operation face, reduce labor intensity of operating personnel, but when concrete flowability is excessive, also can have a negative impact to concrete quality: concrete flowability is excessive, then glutinous poly-property also can be very poor, be prone to sand-cement slurry and waterborne floating and the laminated segregation phenomenon of stone sinking, and then influence concrete homogeneity, simultaneously also can have a strong impact on concrete pumpability, the phenomenon of stifled pump easily takes place, can cause serious consequence to construction quality, produce " honeycomb " after causing concrete hardening, defectives such as " pitted skins " influences concrete intensity and permanance.In addition, for high-strength or super high strength concrete, the quality that does not only also reflect the mixture pump-conveying property from the flowing property of mixture, because the Binder Materials of high-strength or super high strength concrete is generally higher, and water-cement ratio is generally lower, the consumption of water reducer is higher, this just makes that the flowability of high-strength or super high strength concrete is often very big, but its cohesiveness is also very big, though concrete mix can rely on own wt and flow, flow velocity is very slow, when pumping construction, concrete is very big to the frictional resistance of pump line, and pumping is difficulty very.
Therefore, the quality of estimating Concrete Construction performance and pump-conveying property should be taken all factors into consideration flowability, the homogeneity of concrete mix and stick poly-property.For these three performance detection, all corresponding method should be arranged.
According to " Standard for test methods of properties of ordinary concrete mixture standard " GB/T 50080-2002 regulation, the mobile size method of surveying the slump and divergence of mixture, this method is simple and convenient, and it is higher that engineering circle receives degree.
The homogeneity of mixture does not have the detection method of standard at present, Chinese patent 200720086777.X has proposed a kind of light aggregate concrete rheological property and homogeneous pick-up unit, this device is divided into several layers by the delamination degree bucket with concrete mix, light-weight aggregate in cleaning out every layer concrete, the weight of the light-weight aggregate in drawing every layer after the oven dry, estimate the homogeneity of every layer concrete, have certain feasibility, but test operation is comparatively complicated.
The glutinous poly-vigorous denseness of the useful dimension of property of mixture is evaluated, and can only evaluate the dry concrete mixture but tie up vigorous denseness, is not suitable for chutable concrete; At present, the also useful time of falling the slump is evaluated glutinous poly-property, method is after concrete mix is filled in the slump cone inversion, by testing crew whole slump cone is mentioned, all evaluate glutinous poly-property from the time that slump cone flows out with concrete mix, the time of falling the slump is long more to show that then the glutinous poly-property of concrete mix is big more, but this method personal error is bigger.
Therefore, when the workability of concrete mix and pump-conveying property are estimated, on the basis of the slump that records concrete mix and divergence, be necessary to propose to be fit to measure the homogeneity of concrete mix and the test method of glutinous poly-property.
Summary of the invention
The purpose of this invention is to provide a kind of easy to use, measure the method for concrete mix homogeneity and glutinous poly-property efficiently.
To achieve these goals, technical scheme of the present invention is: measure concrete mix homogeneity and glutinous method of gathering property, it is characterized in that comprising the steps:
1) prepare to measure concrete mix homogeneity and the glutinous device that gathers property:
Measure the concrete mix homogeneity and comprise support, coaster, hopper, hopper and baffle plate with the glutinous device that gathers property; Support comprises two parallel slide rails and in order to support the supporting leg of slide rail; Coaster is located on two slide rails; Hopper is fixed on the coaster, and the bottom of hopper offers discharge port; Hopper is positioned at the below of two parallel slide rails, and hopper is arranged in order along the direction that is parallel to slide rail by the identical magazine of a plurality of shapes and forms; One end of support is fixed with baffle plate, baffle plate be positioned at slide rail under, baffle plate and slide rail be arranged in parallel, when coaster is positioned at reference position, the discharge port of baffle plate sealing hopper;
2) will measure the concrete mix homogeneity and be in reference position with the glutinous coaster that gathers the device of property, concrete mix is filled in the hopper, this coaster is at the uniform velocity slided along this track, concrete mix falls in the hopper from this hopper; Statistics falls to having the quantity n of magazine of concrete mix, and to characterize the glutinous poly-property of concrete mix, n value is big more, illustrate that concrete mix is big more from the time that the discharge port of hopper flows out, and promptly concrete mix sticks that to gather property big more;
3) will fall to having the magazine of concrete mix to claim its weight one by one, calculate the homogeneity of concrete mix by following coefficient of dispersion formula:
CV = 1 n - 3 Σ i = 2 n - 1 ( W i - 1 n - 2 Σ i = 2 n - 1 W i ) 2 1 n - 2 Σ i = 2 n - 1 ( W i - W 0 ) × 100 %
Wherein: CV---the homogeneity of concrete mix;
W i---i weight that falls to having the magazine of concrete mix, i 〉=2;
W 0---do not fall to having the weight of the magazine of concrete mix;
N---fall to having the quantity of the magazine of concrete mix, n 〉=4;
CV is big more, illustrates that the homogeneity of concrete mix is poor more.
Being shaped as of described hopper is inverted terrace with edge shape or is inverted taper type.Described coaster is the electrodynamic type coaster.
Compared with prior art, beneficial effect of the present invention is: have easy to use, characteristics efficiently, can measure the homogeneity and the glutinous poly-property of concrete mix simultaneously.
Description of drawings
Fig. 1 is the schematic perspective view of apparatus of the present invention;
Fig. 2 is the schematic perspective view of support;
Fig. 3 is the schematic perspective view of coaster;
Fig. 4 is the schematic perspective view of hopper;
Fig. 5 is the schematic perspective view of hopper;
Fig. 6 be coaster when reference position, front elevation of the present invention;
Fig. 7 be coaster when the working position, front elevation of the present invention.
Description of symbols among the figure: 1-support, 2-coaster, 3-hopper, 4-hopper, 11-supporting leg, 12-slide rail, 13-baffle plate, 21-motor, 41-magazine.
Embodiment
In order to understand the present invention better, the present invention will be further described below in conjunction with embodiment and accompanying drawing.
See also Fig. 1-7, measure concrete mix homogeneity and the glutinous device that gathers property, it comprises support 1, coaster 2, hopper 3, hopper 4, baffle plate 13; Support 1 comprises two parallel slide rails 12 and in order to support the supporting leg 11 of slide rail 12, fixedly connected with supporting leg 11 respectively in the bottom surface, both ends of slide rail 12; Coaster 2 is located on two slide rails 12, and can slide along slide rail 12; Hopper 3 is fixed on the coaster 12, and the bottom of hopper 3 offers discharge port, is mainly used to carry concrete mix; Terrace with edge shape is inverted in being shaped as of hopper 3.The shape that is appreciated that hopper 3 also can be the inversion taper type, to guarantee that concrete mix evenly falls from discharge port.Hopper 4 is positioned at the below of two parallel slide rails 12, and hopper 4 is arranged in order along the direction that is parallel to slide rail 12 by the identical magazine 41 of a plurality of shapes and forms (as 4-100 magazine); One end of support 1 is fixed with baffle plate 13, baffle plate 13 be positioned at slide rail 12 under, baffle plate 13 be arranged in parallel with slide rail 12, when coaster 2 is positioned at reference position (when hopper 3 is positioned at an end of slide rail 12), the discharge port of baffle plate 13 sealing hoppers 3 flows out from hopper 3 to stop concrete mix.
Also be provided with motor 21 (coaster is an electric hoist) on the coaster 2, the output shaft of motor 21 is linked to each other by the axle of the road wheel on gear train and the coaster 2, is used to control coaster 2 uniform motion on slide rail 12.
Measure concrete mix homogeneity and glutinous method of gathering property, it comprises the steps:
1) prepare to measure concrete mix homogeneity and the glutinous device (as mentioned above) that gathers property,
2) coaster 2 that will measure concrete mix homogeneity and the device of glutinous poly-property is in reference position and (coaster 2 is stopped at an end of slide rail 12, because baffle plate 13 sealing discharge ports, therefore this moment, concrete mix can't flow out from hopper 3,), concrete mix is filled in the hopper, this coaster is at the uniform velocity slided (motor 21 drives coaster 2 and at the uniform velocity slides along slide rail 12) along this track, and concrete mix falls in the hopper from this hopper; Statistics falls to having the quantity n of the magazine 41 of concrete mix, to characterize the glutinous poly-property of concrete mix, the n value is big more, illustrate that concrete mix is big more from the time that the discharge port of hopper flows out, be that big more [n value is followed the speed of coaster for the glutinous poly-property of concrete mix, the size of magazine, and the capacity of hopper all is related, but for same device (when doing same batch of concrete mix laboratory sample), the speed of coaster then, the size of magazine, and the capacity of hopper is certain, in the present embodiment, when the n value less than 8 the time, the glutinous poly-property of concrete mix is less, when the n value is between 8～10, the glutinous poly-property of concrete mix is moderate, when n value greater than 10 the time, the glutinous property of gathering of concrete mix is bigger];
3) will fall to having the magazine of concrete mix to claim its weight one by one, calculate the homogeneity of concrete mix by following coefficient of dispersion formula:
CV = 1 n - 3 Σ i = 2 n - 1 ( W i - 1 n - 2 Σ i = 2 n - 1 W i ) 2 1 n - 2 Σ i = 2 n - 1 ( W i - W 0 ) × 100 %
Wherein: CV---the homogeneity of concrete mix;
W i---i weight that falls to having the magazine of concrete mix, i 〉=2;
W 0---do not fall to having the weight of the magazine of concrete mix;
N---fall to having the quantity of the magazine of concrete mix, n 〉=4.
CV is big more, illustrates that the homogeneity of concrete mix is poor more (in the present embodiment, CV is poor more greater than 10% o'clock homogeneity, and CV is good more less than 10% o'clock homogeneity).
Further specify the present invention below in conjunction with embodiment.
Table 1 is proportioning and the mobile data that are used for measuring homogeneity and stick the concrete mix of the embodiment 1-8 that gathers property.Wherein, embodiment the 1, the 2nd, and strength grade is the normal concrete of C30; Embodiment the 3, the 4th, and strength grade is the super high strength concrete of C80; Embodiment the 5, the 6th, and light aggregate concrete, light-weight aggregate are haydites of book structure, 800 grades of density ratings, apparent density 1300kg/m 3Embodiment the 7, the 8th, baryte, bar apparent density 4200kg/m 3Need to prove, flowability is measured with existing standard, the purpose of listing it is: pass through current measuring methods, only on the size of the slump and divergence, be to reflect well that concrete is in the pumping construction process, other serviceabilitys except that mobile particularly under all very big situation of the numerical value of the slump and divergence.
Table 1
Figure BDA0000024634660000051
Table 2 is that the concrete mix of the listed embodiment 1-8 of table 1 uses said method to measure the data of homogenieity and glutinous poly-property.
Table 2
Figure BDA0000024634660000052
As shown in Table 2, use this said method can measure the homogeneity and glutinous poly-property of concrete mix comparatively easily.
Protection scope of the present invention is not limited to the above embodiments, and other technical scheme identical with essence of the present invention all belongs to the scope of protection of the invention.

Claims (3)

1. measure concrete mix homogeneity and glutinous method of gathering property, it is characterized in that comprising the steps:
1) prepare to measure concrete mix homogeneity and the glutinous device that gathers property:
Measure the concrete mix homogeneity and comprise support, coaster, hopper, hopper and baffle plate with the glutinous device that gathers property; Support comprises two parallel slide rails and in order to support the supporting leg of slide rail; Coaster is located on two slide rails; Hopper is fixed on the coaster, and the bottom of hopper offers discharge port; Hopper is positioned at the below of two parallel slide rails, and hopper is arranged in order along the direction that is parallel to slide rail by the identical magazine of a plurality of shapes and forms; One end of support is fixed with baffle plate, baffle plate be positioned at slide rail under, baffle plate and slide rail be arranged in parallel, when coaster is positioned at reference position, the discharge port of baffle plate sealing hopper;
2) will measure the concrete mix homogeneity and be in reference position with the glutinous coaster that gathers the device of property, concrete mix is filled in the hopper, this coaster is at the uniform velocity slided along this track, concrete mix falls in the hopper from this hopper; Statistics falls to having the quantity n of magazine of concrete mix, and to characterize the glutinous poly-property of concrete mix, n value is big more, illustrate that concrete mix is big more from the time that the discharge port of hopper flows out, and promptly concrete mix sticks that to gather property big more;
3) will fall to having the magazine of concrete mix to claim its weight one by one, calculate the homogeneity of concrete mix by following coefficient of dispersion formula:
CV = 1 n - 3 Σ i = 2 n - 1 ( W i - 1 n - 2 Σ i = 2 n - 1 W i ) 2 1 n - 2 Σ i = 2 n - 1 ( W i - W 0 ) × 100 %
Wherein: CV---the homogeneity of concrete mix;
W i---i weight that falls to having the magazine of concrete mix, i 〉=2;
W 0---do not fall to having the weight of the magazine of concrete mix;
N---fall to having the quantity of the magazine of concrete mix, n 〉=4;
CV is big more, illustrates that the homogeneity of concrete mix is poor more.
2. measurement concrete mix homogeneity according to claim 1 and glutinous method of gathering property is characterized in that: being shaped as of described hopper is inverted terrace with edge shape or is inverted taper type.
3. measurement concrete mix homogeneity according to claim 1 and glutinous method of gathering property, it is characterized in that: described coaster is the electrodynamic type coaster.
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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103926170A (en) * 2014-04-14 2014-07-16 长安大学 Device and method for testing adhesive aggregation performance of cold patch asphalt mixture
CN107796725A (en) * 2017-09-06 2018-03-13 山东科技大学 Concrete disintegration dynamic analysing method
RU2676853C1 (en) * 2017-12-28 2019-01-11 Акционерное общество "Научно-исследовательский центр "Строительство", АО "НИЦ "Строительство" Method for determining the uniformity of concrete in the section of concrete and reinforced concrete structures
CN110031360A (en) * 2019-03-05 2019-07-19 广东龙湖科技股份有限公司 A kind of detection of inorganic flow material homogeneity and representation method
CN110595849A (en) * 2019-01-14 2019-12-20 广东基业长青建筑科技有限公司 Concrete filling method capable of reducing discreteness of concrete test block
CN112630099A (en) * 2021-01-28 2021-04-09 山东港湾建设集团有限公司 Mortar cohesiveness detection device and detection method thereof
CN113063929A (en) * 2021-03-19 2021-07-02 上海市市政规划设计研究院有限公司 Method for testing uniformity of steel fibers in ultrahigh-performance concrete

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Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103926170A (en) * 2014-04-14 2014-07-16 长安大学 Device and method for testing adhesive aggregation performance of cold patch asphalt mixture
CN103926170B (en) * 2014-04-14 2015-11-18 长安大学 A kind of cold repairing asphalt mixture adhesive aggregation performance testing device and method of testing
CN107796725A (en) * 2017-09-06 2018-03-13 山东科技大学 Concrete disintegration dynamic analysing method
RU2676853C1 (en) * 2017-12-28 2019-01-11 Акционерное общество "Научно-исследовательский центр "Строительство", АО "НИЦ "Строительство" Method for determining the uniformity of concrete in the section of concrete and reinforced concrete structures
CN110595849A (en) * 2019-01-14 2019-12-20 广东基业长青建筑科技有限公司 Concrete filling method capable of reducing discreteness of concrete test block
CN110595849B (en) * 2019-01-14 2022-04-26 广东基业长青建筑科技有限公司 Concrete filling method capable of reducing discreteness of concrete test block
CN110031360A (en) * 2019-03-05 2019-07-19 广东龙湖科技股份有限公司 A kind of detection of inorganic flow material homogeneity and representation method
CN112630099A (en) * 2021-01-28 2021-04-09 山东港湾建设集团有限公司 Mortar cohesiveness detection device and detection method thereof
CN113063929A (en) * 2021-03-19 2021-07-02 上海市市政规划设计研究院有限公司 Method for testing uniformity of steel fibers in ultrahigh-performance concrete
CN113063929B (en) * 2021-03-19 2024-06-11 上海市市政规划设计研究院有限公司 Method for testing uniformity of steel fibers in ultra-high performance concrete

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