CN101008640A - Integrated device for measurement and evaluation of workability of self-compacting concrete - Google Patents
Integrated device for measurement and evaluation of workability of self-compacting concrete Download PDFInfo
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- CN101008640A CN101008640A CN 200710034374 CN200710034374A CN101008640A CN 101008640 A CN101008640 A CN 101008640A CN 200710034374 CN200710034374 CN 200710034374 CN 200710034374 A CN200710034374 A CN 200710034374A CN 101008640 A CN101008640 A CN 101008640A
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Abstract
This invention discloses one self-impacting concrete work property test and evaluation integration device, wherein, the rack supports and fixes switch head tamper cylinder with axis central line vertical to level surface with small diameter facing down; the said small diameter end is set with valve is set with plane board in certain distance; the said rack, plane board are fixed on band wheel cargo. This invention is one integration device to realize work property test.
Description
Technical field
The present invention relates to a kind of test evaluation integrated apparatus of concrete material performance.
Background technology
Concrete workability test evaluation is a very complicated difficult problem, at present, widespread use be the slump cone method
[1,2]([1] P.Kumar Mehta, Paulo J.M.Monteiro.CONCRETE:microstructure, properties and materials[M, third edition] .The McGraw-HillCompanies, New York, 2006; [2] Zhou Shiqiong. civil engineering material [M]. Beijing: China Railway Press, 2004), this method is simple and easy, but must could reflect concrete rheological properties in conjunction with subjective experience.Self-compacting concrete comprises the content of three aspects such as fillibility, education resistance and gap trafficability characteristic because the requirement of its workability is very high
[3]([3] Hajime Okamuraand Masahiro Ouchi.Self-compacting concrete:Development, present useand future[C], In:Proceedings of 1
StInternational RILEM Symposium onself-compacting concrete, Stockholm, Sweden, September, 1999:3～14), the index that adopts traditional slump cone method test to obtain is not enough to reflect " self compacting ability " feature and the requirement of self-compacting concrete, and test result susceptibility is poor.Therefore, at the characteristics of self-compacting concrete, the testing tool of many relevant self-compacting concrete workabilities has been developed in countries in the world
[4-6]([4] P.J.M.Bartos.Testing-SCC:Towards new European Standards forfresh SCC[C], In:Proceedings of 1
StInternational symposium on design, performance and use of self-consolidating concrete, Changsha, China, 2005:25-46; [5] V.K.Buia,, D.Montgomeryb, I.Hinczakc, K.Turner.Rapidtesting method for segregation resistance of self-compacting concrete[J], Cement and Concrete Research, 2002,32 (9): 1489-1496; [6] M.Sonebi, M.Rooney and P.J.M.Bartos.Evaluation of the segregation resistance offresh self-compacting concrete using different test methods[C], In:Proceedings of 1
StInternational symposium on design, performance and useof self-consolidating concrete, Changsha, China, 2005:301-308), as L shaped mobile instrument, the U-shaped instrument, the V-arrangement funnel, the Orimet instrument, J ring instrument etc., yet these single methods also are not enough to reflect the rheological property of self-compacting concrete comprehensively, 2 kinds or 3 kinds of methods combine use often, complicated operation, repdocutbility is poor, and these method of testing major parts only can reflect workability under the static situation of concrete, and the current intelligence when building with concrete is actual there are differences etc.Self-compacting concrete has obvious superiority on performance, the engineering application potential is very big, and its workability of test evaluation plays crucial effects to its engineering application practice and quality control on construction thereof effectively.In order to solve the difficult problem in the measurement and evaluation of workability of self-compacting concrete, the present invention develops a kind of test integrated experimental provision of self-compacting concrete workability of simple possible, and has proposed relevant evaluating index.
Summary of the invention
Technical matters to be solved by this invention is at having problems in the present workability of concrete test evaluation, on the basis of summing up existing workability of concrete method of testing, in conjunction with the concrete rheological characteristic, a kind of integrated device for measurement and evaluation of workability of self-compacting concrete is provided, the parameter that obtains by this device to test can objective, accurately reflect its viscosity and surrender shear stress character, and the situation when can the feasible simulation concrete mix is actual building.
For solving the problems of the technologies described above, integrated device for measurement and evaluation of workability of self-compacting concrete provided by the invention, the tube of falling the frustoconical is propped and be fixed with to support, the longitudinal center line of the described tube of falling the frustoconical perpendicular to surface level and minor diameter mouth end down, the minor diameter mouth end of the described tube of falling the frustoconical is provided with valve, has been horizontally disposed with flat board with a certain distance from the minor diameter mouth end below of the described tube of falling the frustoconical.
Described support, flat board are installed on the dolly of belt wheel.
The longitudinal center line of the described tube of falling the frustoconical overlaps with described dull and stereotyped vertical center line.
Vertical range is that the 30cm place has been horizontally disposed with flat board from the minor diameter mouth end below of the described tube of falling the frustoconical.
It also is provided with a reinforced steel bar ring, described reinforced steel bar ring is arranged on the described flat board and described reinforced steel bar ring longitudinal center line overlaps with the longitudinal center line of the described tube of falling the frustoconical, have vertical scale around the bar reinforcement on the described reinforced steel bar ring, minimum scale is 0.5cm.
Adopt the integrated device for measurement and evaluation of workability of self-compacting concrete of technique scheme, the concrete mix sample is packed in the tube of falling the frustoconical, allow sample flow out through valve from minor diameter mouth end then and fall on the flat board, test sample flows out the tube of falling frustoconical required time and flow to the dynamic expansion degree of the mixture sample on the flat board.Simultaneously, in order to test the gap trafficability characteristic of autodensing concrete almixture, place a reinforced steel bar ring (size is encircled with J) in dull and stereotyped centre, be with vertical scale on the reinforced steel bar ring around the bar reinforcement, minimum scale is 0.5cm, the mixture that flows out in the tube of falling the frustoconical drops in the reinforced steel bar ring, and the part mixture flow to outside the reinforced steel bar ring by the bar reinforcement gap around the reinforced steel bar ring again, can test to obtain the inside and outside high difference of mixture of reinforced steel bar ring.By the time of this integrated apparatus test mixture outflow tube of falling the frustoconical, parameters such as the inside and outside dynamically discrepancy in elevation of dynamic expansion degree and reinforced steel bar ring are estimated the workability of concrete mix.
Concrete mix actual build in the process to flow out from hopper or pump line enter the entity structure and expansion towards periphery, by bar-mat reinforcement gap filling template then.Therefore, the present invention is based on actual conditions, adopt support to prop and fixing frustoconical tube (the same slump cone of size), the longitudinal center line of frustoconical tube perpendicular to surface level and minor diameter mouth end down, described minor diameter mouth end is provided with valve, it is dull and stereotyped preferably to be provided with rigidity with a certain distance from minor diameter mouth end below, and this distance is determined by test.Support, flat board are installed on the dolly of belt wheel.The concrete mix sample is packed in the tube of falling the frustoconical, flush back floating with the tube of falling frustoconical upper port to mixture, left standstill 5～10 seconds, allow sample flow out from valve then and fall on the flat board, test sample flows out the tube of falling frustoconical required time and flow to the dynamic expansion degree of the mixture sample on the flat board.Simultaneously, in order to test the gap trafficability characteristic of autodensing concrete almixture, place a reinforced steel bar ring (size is encircled with J) in dull and stereotyped centre, be with vertical scale (minimum scale is 0.5cm) on the reinforced steel bar ring around the bar reinforcement, the mixture that flows out in the tube of falling the frustoconical drops in the reinforced steel bar ring, the part mixture flow to outside the reinforced steel bar ring by the reinforcing bar gap around the reinforced steel bar ring again, can test to obtain the inside and outside high difference of mixture of reinforced steel bar ring.By the time of this integrated apparatus test mixture outflow tube of falling the frustoconical, parameters such as the inside and outside dynamically discrepancy in elevation of dynamic expansion degree and reinforced steel bar ring are estimated the workability of concrete mix.
By experimental study, determine that the tube of falling frustoconical lower port to dull and stereotyped vertical range is 30cm; Simultaneously, this device and the workability parameter that original slump cone method, the test of L shaped current meter obtain are compared corresponding relation between the analytical parameters and validity thereof.In conjunction with the composition of self-compacting concrete, the correlationship between the performance, obtain the test evaluation parameter of this test unit.Test findings shows, the parameter that adopts workability parameter that this device to test obtains and other instruments to record has good corresponding relation, can reflect the rheological properties of corresponding mixture preferably.Simultaneously, also find, because one of the parameter that this device records dynamic flow divergence is the parameter of concrete mix when dynamic flow, there are differences with the mobile divergence of traditional slump, reflected the influence of dynamic flow to the mixture flowability, this be traditional slump method can not reflect.
By changing super plasticizer parameter, water consumption etc. workability is influenced significant parameter, change the rheological properties of mixture, adopt this device then and use slump method always and test comparison, relatively the variation susceptibility between each test parameter.Testing research is the result show, the workability parameter that this device to test obtains is with mixture change of properties sensitivity, and because the autodensing concrete almixture flowability is very big, the slump is more than 24cm, and therefore, traditional slump cone method changes insensitive.
The concrete mix rheological properties comprises viscosity and two parameters of surrender shear stress, and reasonably the test evaluation index should be tried one's best and accurately be reflected these two parameters.In this method of testing, pass through the device invented, the delivery time T reflection viscometric properties of test mixture, the test mixture dynamic expansion degree F reflection surrender shear stress character on flat board; And the discrepancy in elevation Δ h of mixture inside and outside the reinforced steel bar ring when obtaining the mixture dynamic flow by test, the gap trafficability characteristic of reflection mixture.The workability that comprehensively reflects self-compacting concrete according to 3 parameters of this experimental provision acquisition.
Advantage of the present invention and good effect are:
1, adopt this device can obtain reflecting the viscometric properties of concrete mix and two parameters of surrender shear stress character separately; And the parameter that test obtains can reflect the self compacting ability of autodensing concrete almixture objective, all sidedly;
2, can reflect concrete mix serviceability under the current intelligence in the practice of construction process;
3, compare with classic method, the artificial subjective influence factor of this method reduces, and objectivity is strong;
4, simple to operate, the mixture amount that test needs few (identical with traditional slump cone method, as to be less than L shaped current meter, the required amount of U-shaped instrument test);
5, can be used for the laboratory or the test evaluation of site operation workability of the concrete mix of the slump 〉=15cm.
In sum, the present invention is a kind of integrated device for measurement and evaluation of workability of self-compacting concrete, the parameter that obtains by this device to test can objective, accurately reflect its viscosity and surrender shear stress character, and the integrated device for measurement and evaluation of workability of self-compacting concrete of the situation when can the feasible simulation concrete mix is actual building, and simple in structure, easily manufactured, simple to operate, dependable performance.
Description of drawings
Following structure the drawings and specific embodiments are described in further detail the present invention.
Fig. 1 is a structural representation of the present invention;
Fig. 2 is that the present invention uses the reinforced steel bar ring structural representation.
Embodiment
Referring to Fig. 1 and Fig. 2, the present invention adopts support 1 to prop and the fixing tube of falling the frustoconical 2 (the same slump cone of size), the longitudinal center line of the tube of falling the frustoconical 2 perpendicular to surface level and minor diameter mouth end down, described minor diameter mouth end is provided with valve 3, determine that the tube of falling the frustoconical 2 lower port to the vertical range of flat board 5 is 30cm, this distance determines that by test the longitudinal center line of the tube of falling the frustoconical 2 overlaps with dull and stereotyped 5 vertical center lines, and support 1, dull and stereotyped 5 is installed on the dolly 4 of belt wheel.
(1), referring to Fig. 1, install instrument according to experimental provision shown in Figure 1, the valve 3 of the tube of falling the frustoconical 2 lower port is closed, then the concrete mix sample is packed in the tube of falling the frustoconical 2, it is floating to flush the back with the tube of falling the frustoconical 2 upper port to mixture, leaves standstill 5～10 seconds, opens the tube of falling the frustoconical 2 end opening end valve doors 3, allow sample flow out and fall on dull and stereotyped 5, begin to flow out the tube of falling the frustoconical 2 to mixture with stopwatch test mixture and all flow out the tube of falling the frustoconical 2 required time T
1Mixture all flows out the tube of falling the frustoconical 2 back 30s, is meter ruler test mixture sample divergence F on orthogonal both direction on dull and stereotyped 5 of 0.5cm with minimum scale
1And F
2, obtain mean value F.
(2), above-mentioned test finishes, again mix mixture immediately thoroughly and install instrument according to experimental provision as shown in Figure 2, reinforced steel bar ring 6 is arranged on dull and stereotyped 5 and reinforced steel bar ring 6 longitudinal center lines overlap with the longitudinal center line of frustoconical tube 2, then the mixture sample is packed in the tube of falling the frustoconical 2, flush back floating with the tube of falling the frustoconical 2 upper port to mixture, left standstill 5～10 seconds, open the valve 3 of the tube of falling the frustoconical 2 end opening ends, allow sample flow out and fall on dull and stereotyped 5, begin to flow out the tube of falling the frustoconical 2 to mixture with stopwatch test mixture and all flow out the tube of falling the frustoconical 2 required time T
2Mixture all flows out the tube of falling the frustoconical 2 back 30s, the height value of outside concrete mix in directly reading on the reinforced steel bar ring 6 orthogonal both directions on 4 bar reinforcements respectively, the mean value of getting the outside concrete mix discrepancy in elevation in 4 bar reinforcements is the inside and outside dynamic discrepancy in elevation Δ of the concrete mix h of ring.Simultaneously, get the T that records for twice
1, T
2Mean value T be the delivery time.
(3), with the workability of delivery time T, dynamic expansion degree F and inside and outside h3 the index evaluation mixture of the dynamic discrepancy in elevation Δ of mixture of ring.By above test, can accurately reflect the workability (flowability, gap trafficability characteristic and education resistance energy) of the autodensing concrete almixture of surveying.
Adopt this device can obtain flow time T, dynamic expansion degree F and inside and outside three parameters of the dynamic discrepancy in elevation Δ of mixture h of ring that mixture flows out frustoconical, as T=2s～6s, F 〉=600mm, Δ h≤35mm can judge that the concrete mix of surveying has reached " self compacting ability " requirement accordingly.
Claims (7)
1, a kind of integrated device for measurement and evaluation of workability of self-compacting concrete, it is characterized in that: the tube of falling the frustoconical (2) is propped and be fixed with to support (1), the longitudinal center line of the described tube of falling the frustoconical (2) perpendicular to surface level and minor diameter mouth end down, the minor diameter mouth end of the described tube of falling the frustoconical (2) is provided with valve (3), has been horizontally disposed with flat board (5) with a certain distance from the minor diameter mouth end below of the described tube of falling the frustoconical (2).
2, integrated device for measurement and evaluation of workability of self-compacting concrete according to claim 1 is characterized in that: described support (1), dull and stereotyped (5) are installed on the dolly (4) of belt wheel.
3, integrated device for measurement and evaluation of workability of self-compacting concrete according to claim 1 and 2 is characterized in that: the longitudinal center line of the described tube of falling the frustoconical (2) overlaps with described flat board (5) vertical center line.
4, integrated device for measurement and evaluation of workability of self-compacting concrete according to claim 1 and 2 is characterized in that: vertical range is that the 30cm place has been horizontally disposed with flat board (5) from the minor diameter mouth end below of the described tube of falling the frustoconical (2).
5, integrated device for measurement and evaluation of workability of self-compacting concrete according to claim 1 and 2, it is characterized in that: it also is provided with a reinforced steel bar ring (6), described reinforced steel bar ring (6) is arranged on the described flat board (5) and described reinforced steel bar ring (6) longitudinal center line overlaps with the longitudinal center line of the described tube of falling the frustoconical (2), have vertical scale around the bar reinforcement on the described reinforced steel bar ring (6), minimum scale is 0.5cm.
6, integrated device for measurement and evaluation of workability of self-compacting concrete according to claim 3, it is characterized in that: it also is provided with a reinforced steel bar ring (6), described reinforced steel bar ring (6) is arranged on the described flat board (5) and described reinforced steel bar ring (6) longitudinal center line overlaps with the longitudinal center line of the described tube of falling the frustoconical (2), have vertical scale around the bar reinforcement on the described reinforced steel bar ring (6), minimum scale is 0.5cm.
7, integrated device for measurement and evaluation of workability of self-compacting concrete according to claim 4, it is characterized in that: it also is provided with a reinforced steel bar ring (6), described reinforced steel bar ring (6) is arranged on the described flat board (5) and described reinforced steel bar ring (6) longitudinal center line overlaps with the longitudinal center line of the described tube of falling the frustoconical (2), have vertical scale around the bar reinforcement on the described reinforced steel bar ring (6), minimum scale is 0.5cm.
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