CN106596907A - Test method for evaluating form maintaining ability of fresh concrete - Google Patents
Test method for evaluating form maintaining ability of fresh concrete Download PDFInfo
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- CN106596907A CN106596907A CN201611159377.7A CN201611159377A CN106596907A CN 106596907 A CN106596907 A CN 106596907A CN 201611159377 A CN201611159377 A CN 201611159377A CN 106596907 A CN106596907 A CN 106596907A
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- concrete
- fresh concrete
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- holding capacity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N33/00—Investigating or analysing materials by specific methods not covered by groups G01N1/00 - G01N31/00
- G01N33/38—Concrete; ceramics; glass; bricks
- G01N33/383—Concrete, cement
Abstract
Aimed at present concrete working performance test methods incapable of effectively evaluating the form maintaining ability of fresh concrete, the invention provides a test method for evaluating the form maintaining ability of the fresh concrete. By adjusting the length of screws and bolts fixed on one side of a mold or adding spacers with different thicknesses, the method rotates the mold around a fixed point, so that a certain angle is formed between the bottom of the mold and a horizontal plane, the fresh concrete is poured into the mold, changes in the distance between the shaped surface of the concrete and the brim of the mold are tested under two states, i.e. when the bottom of the mold makes an angle with the horizontal plane and after a slope is constructed and when the bottom of the mold is in a horizontal state and after a shape or slope become stable, a fresh concrete slope changing curve is drawn and an average value of absolute altitude difference variation values at each point is calculated in order to qualitatively and quantitatively compare the slope maintaining ability of concretes with different proportions or compositions, and thereby a simple, effective and reliable evaluation method is provided for the proportioning and production of fresh concrete with certain form maintaining ability.
Description
Technical field
The present invention relates to concrete field, and in particular to a kind of test for evaluating fresh concrete form holding capacity
Method.
Background technology
Fresh concrete must have good service behaviour, with facilitate site pumping, pour, shaping of vibrating.However, being full
During the specific function such as foot construction draining or structure overlap joint, it is desirable to casting concrete or concrete formation face is made into tool on inclined-plane
Have the structure of certain slope, especially when inclined-plane or into it is domatic larger when, normal concrete is smeared after slope or closing slope process Jing scene,
Still there is certain fluidity during standing, cause concrete effectively to keep upon hardening and shape into the gradient, cause the gradient
" disappearing totally ", now needs by filling " thixotropic agent " or adjustment Stock allotment right so that fresh concrete has certain " touching
Become performance ", i.e., pumping, when the Dynamic Construction such as pouring, vibrate with good mobility, and wipe one's face stand after, before initial set
With certain form holding capacity.Meanwhile, when fresh concrete has certain gradient holding capacity, for pouring on the slope
Concrete is built, also favorably bloated concrete is reduced or is run the risk of mould.Thus, the gradient holding capacity of fresh concrete is one
Item practicality, the technical indicator to engineer applied with larger directive significance.And so far both at home and abroad still without a kind of effective
For evaluating the method for testing of fresh concrete form holding capacity.
For fresh concrete, its service behaviour is an extremely complex overall target, generally by determining mobility,
It is aided with other observations directly perceived or experience Comprehensive Assessment concrete workability again.The assay method of mobility has slump method, Wei Bo
The kinds more than ten such as denseness method, sonde method, skewed slot method, delivery time method and Kai Li ball, for normal concrete, most commonly
Slump method and Wei Bo denseness methods.Slump test may be only available for normal concrete of the slump more than 10mm, and tie up vigorous
Denseness can only reflect the dry of concrete.For thixotropy concrete, above-mentioned method of testing generally cannot effective district with instrument
Divide the otherness of its fresh concrete form holding capacity, in addition it is basic inapplicable, needs are added by observing and experience synthesis
Its workability is evaluated, the error that subjectivity causes is larger.
Therefore, for the problems referred to above, a kind of method of testing for evaluating fresh concrete form holding capacity has been invented,
So as to have certain thixotropic concrete provide a kind of simple, effective, reliable test evaluation method to prepare, producing.
The content of the invention
The purpose of the present invention is that the method for testing for being directed to current working performance of concrete is unable to effective evaluation fresh concrete
Form holding capacity, there is provided a kind of method of testing for evaluating fresh concrete form holding capacity, so as to for preparation, produce
High thixotropic, the fresh concrete of high form holding capacity provide a kind of simple, effective, reliable test evaluation method.
The present invention is achieved by the following technical solutions：A kind of survey for evaluating fresh concrete form holding capacity
Method for testing, it is characterised in that the method is mainly included the following steps that：
（1）Prepare the testing mould of the fresh concrete form holding capacity of adjustable inclination angle：
Described testing mould is upper opening of mould, and the mould can pass through fixed screw, the screw rod on one side thereof of adjustment
Length adds different-thickness cushion block, to realize mould around a fixed point rotary, makes mould bottom surface form certain folder with horizontal plane
Angle；
（2）The concrete of test is prepared, the indexs such as the slump, the air content of the concrete is tested, it is ensured that it meets engineering and applies
The requirement of work；
（3）Testing mould is placed on concrete vibrating stand or plane, by adjusting the screw of mould side, spiro rod length or adding
If certain thickness cushion block, by mould bottom surface be horizontally formed certain angle；
（4）Fresh concrete is loaded into mould, is consolidated using shake table ram-jolt or vibrating head, while forming surface is floating；
（5）After floating, along gradient direction at a certain distance, test edge on forming surface and mould apart from h1、h2、h3、……、hn；
（6）The screw length of steady adjustment mould side withdraws cushion block, mould bottom surface is recovered to horizontality, stands to mixed
Solidifying soil form stable；
（7）After coagulation earth concrete form stable or initial set, according to step（5）Same measurement position and spacing, test is mixed
Solidifying soil initial set aftershaping face with mould edge apart from h’ 1、h’ 2、h’ 3、……、h’ n；
（8）The distance parameter that diverse location is measured is used in, the slope change curve of fresh concrete is drawn, and is calculated as follows
The mean value of each point discrepancy in elevation change absolute value before and after testing twice：
h= （∣h’ 1-h1∣+∣h’ 2-h2∣+∣h’ 3-h3∣+…… +∣h’ n-hn∣）/n
（9）The mean value of contrast slope's deformation curve and the discrepancy in elevation absolute value：Intensity gradient curve change is bigger, discrepancy in elevation absolute value it is flat
Average is bigger, illustrates that the form holding capacity of its fresh concrete is poorer；
It is described along gradient direction measuring distance at a certain distance, it can be equidistantly also dependent on needing to arrange different measuring points
Spacing.
Therefore, the fresh concrete gradient deformation curve for being measured using this method and the mean value of discrepancy in elevation change absolute value,
The gradient holding capacity for comparing different ratio or composition concrete that can be qualitative and quantitative respectively, so as to prepare, production tool
There is certain thixotropic concrete to provide reference and evaluation index.
Compared with being currently used for testing the method for testing of fresh concrete service behaviour, coagulation is newly mixed using present invention test
The method of testing of native form holding capacity has advantages below：
（1）The method is more targeted, can effective evaluation fresh concrete form holding capacity, it is suitable preferably to have
The fresh concrete proportioning of " thixotropic property " or composition.
（2）The method is simple, practical, can Fast Evaluation fresh concrete form holding capacity, for preparation is applied to
Inclined-plane or into the concrete under domatic larger operating mode, with preferable Engineering Guidance meaning.
（3）The method can draw respectively fresh concrete smear behind slope with initial set after gradient deformation curve and the discrepancy in elevation change
Mean value, the form holding capacity of reflection fresh concrete that can be qualitative and quantitative, result of the test is directly perceived, reliable.
（4）The method has filled up the domestic and international blank with regard to fresh concrete form holding capacity method of testing, for root
According to operating mode from the coagulation local soil type that more adapts to into or match ratio, there is provided new test evaluation method.
Description of the drawings
Fig. 1 is the general principle figure for testing fresh concrete form holding capacity.
Fig. 2 is the gradient deformation contrast curve of the different mixture ratio fresh concrete using present invention test.
In figure：1- testing moulds, 2- cushion blocks, 3- fresh concretes, 4- horizontal planes.
Specific embodiment
Realization below by way of the specific embodiment introduction present invention and had the advantage that, to be better understood from
Invention, but the invention is not limited in this, and described embodiment is only a part of embodiment of the invention, rather than whole
Embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art are obtained under the premise of creative work is not made
The every other embodiment for obtaining, belongs to the scope of protection of the invention.
Embodiment：
Embodiments provide a kind of for test curve section unballasted track bed plate fresh concrete form holding capacity
Method of testing, to determine the concrete mix and composition that more meet requirement of engineering.Two kinds are have rated using the method not
With the form holding capacity of the fresh concrete of match ratio, particular content is as follows：
Two kinds of concrete --- normal concrete（A）, add the concrete of a certain amount of thixotropic agent（B）Match ratio be shown in Table 1 respectively.
Basic performance indices measured by the concrete of two kinds of match ratios are shown in Table 2.
The normal concrete of table 1 and the match ratio with certain thixotropic concrete
| Sequence number | Title | Cement | Flyash | Thixotropic agent | River sand | Rubble | Water | Water reducer |
| A | Normal concrete | 266 | 114 | 0 | 745 | 1120 | 152 | 3.8 |
| B | With certain thixotropic concrete | 266 | 101.8 | 12.2 | 745 | 1120 | 152 | 4.4 |
The normal concrete of table 2 and the test result with certain thixotropic concrete
The method of testing of fresh concrete form holding capacity is：
（1）Prepare the testing mould of the fresh concrete form holding capacity of adjustable inclination angle：
Maximum superelevation is designed according to ballastless track of high-speed railway circuit and is less than 175mm, gauge 1435mm, its correspondence sine gradient
About 12.2%, prepare the cushion block that 360mm length, 200mm width, 150mm are high, the testing mould of upper opening and 45mm are high, so as to
When the high cushion blocks of 45mm are encased inside mould side, its corresponding sinusoidal gradient is 12.5%, as shown in Figure 1.
（2）The concrete of test is prepared, the indexs such as the slump, the air content of the concrete is tested, it is ensured that it meets work
The requirement that journey is constructed and designed, is specifically shown in Table 2.
（3）Testing mould is placed on concrete vibrating stand, the thick cushion blocks of 45mm are put into into mould side, make mould bottom surface
Be horizontally formed certain angle.
（4）Fresh concrete A, B are respectively charged into into mould, using shake table ram-jolt, while forming surface is floating.
（5）After floating, along the decile of gradient direction 12, by equidistant, the distance of forming surface and edge on mould is tested.
（6）Cushion block is withdrawn, mould bottom surface is recovered to horizontality, stood to concrete initial set.
（7）After concrete initial set, according to step（5）Same measurement position and spacing, after test concrete initial set into
On type face and mould edge apart from H, as shown in Figure 2.
（8）It is used in the distance parameter that diverse location is measured, draws the gradient deformation curve of fresh concrete, and as the following formula
Calculate the mean value of each point discrepancy in elevation change absolute value before and after testing twice：
h= （∣h’ 1-h1∣+∣h’ 2-h2∣+∣h’ 3-h3∣+…… +∣h’ n-hn∣）/n
（9）Fresh concrete A, B gradient deformation curve drawn is shown in Fig. 2, before fresh concrete A, the B for calculating is tested twice
Each point discrepancy in elevation change absolute value afterwards is respectively 0.31cm and 0.28cm.
As can be seen here, in the case where the index such as mechanics, impervious, electric flux is satisfied by design requirement, using present invention side
Method test result has more preferable form holding capacity for A proportionings fresh concrete than B proportioning, can reflect design proportioning
Fresh concrete form holding capacity.
Specially respectively it is pumped up respectively having poured the long non-fragment orbit bottoms of 100m by design superelevation in certain visitor using A, B proportioning concrete
Seat board（Wherein, proportioning A normal concrete is used for uplink, and proportioning B high thixotropic concrete is used for the downlink of correspondence side,
To keep the test gradient consistent）, after concrete hardening, per 10m as a cross section, the 10m to 90m in the range of test section is taken altogether
In the range of 9 sections, the high and low side elevation of upper and lower line correspondence section, its depth displacement and non-fragment orbit width ratio are measured respectively
Value as actual grade, and compared with design grade gradient conservation rate, can with the evaluation result that this evaluates the inventive method
Form holding capacity when the scene for accurately reflecting concrete is applied.Jing survey calculations, the gradient conservation rate of proportioning A concrete is only
For 85%, the gradient conservation rate of proportioning B concrete is up to 98%.
Jing field engineerings application effect is mutually reflected card inspection and shows that the present invention can be tested preferably with result of the test of the present invention
The form holding capacity of fresh concrete, it is advantageously ensured that in inclined-plane or the construction quality into concrete under domatic larger operating mode.
In sum, the present invention is unable to effective evaluation fresh concrete for the method for testing of current working performance of concrete
Form holding capacity, there is provided a kind of method of testing for evaluating fresh concrete form holding capacity, so as to for preparation, produce
High thixotropic, the fresh concrete of high form holding capacity provide a kind of simple, effective, reliable test evaluation method.
Claims (3)
1. a kind of method of testing for evaluating fresh concrete form holding capacity, it is characterised in that the method mainly includes
Following steps：
（1）Prepare the testing mould of the fresh concrete form holding capacity of adjustable inclination angle；
（2）The concrete of test is prepared, the indexs such as the slump, the air content of the concrete is tested, it is ensured that it meets engineering and applies
The requirement of work；
（3）Testing mould is placed on concrete vibrating stand or plane, by adjusting the screw of mould side, spiro rod length or adding
If certain thickness cushion block, by mould bottom surface be horizontally formed certain angle；
（4）Fresh concrete is loaded into mould, is consolidated using shake table ram-jolt or vibrating head, while forming surface is floating；
（5）After floating, along gradient direction at a certain distance, test edge on forming surface and mould apart from h1、h2、h3、……、hn；
（6）The screw length of steady adjustment mould side withdraws cushion block, mould bottom surface is recovered to horizontality, stands to mixed
Solidifying soil form stable；
（7）After coagulation earth concrete form stable or initial set, according to step（5）Same measurement position and spacing, test is mixed
Solidifying soil initial set aftershaping face with mould edge apart from h’ 1、h’ 2、h’ 3、……、h’ n；
（8）The distance parameter that diverse location is measured is used in, the gradient deformation curve of fresh concrete is drawn, and is calculated as follows
The mean value of each point discrepancy in elevation change absolute value before and after testing twice：
h= （∣h’ 1-h1∣+∣h’ 2-h2∣+∣h’ 3-h3∣+…… +∣h’ n-hn∣）/n
（9）The mean value of contrast slope's deformation curve and the discrepancy in elevation absolute value, when intensity gradient curve changes bigger, discrepancy in elevation absolute value
Mean value is bigger, illustrates that the form holding capacity of its fresh concrete is poorer, conversely, then form holding capacity is better；
The fresh concrete gradient deformation curve measured using this method and the mean value of discrepancy in elevation change absolute value, can be qualitative respectively
With the quantitative gradient holding capacity for comparing different ratio or composition concrete, there is certain thixotroping so as to being preparation, producing
Property concrete provide reference and evaluation index.
2. testing mould as claimed in claim 1, it is characterised in that the mould can pass through the fixed spiral shell on one side thereof of adjustment
Silk, spiro rod length add different-thickness cushion block, to realize mould around a fixed point, make mould bottom surface form certain with horizontal plane
Angle.
3. a kind of method of testing for evaluating fresh concrete form holding capacity as claimed in claim 1, its feature exists
In along gradient direction measuring distance at a certain distance, it can be equidistantly also dependent on needing to arrange different measuring point spacing.
Priority Applications (1)
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| CN201611159377.7A CN106596907A (en) | 2016-12-15 | 2016-12-15 | Test method for evaluating form maintaining ability of fresh concrete |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061120A (en) * | 2018-09-30 | 2018-12-21 | 福建科之杰新材料有限公司 | Produce the test evaluation method of precast concrete lining segment concrete |
| CN111596041A (en) * | 2019-09-02 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method and device for testing working performance of concrete under vibration action |
| CN111596040A (en) * | 2019-09-02 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method and device for testing concrete construction performance under vibration action |
| CN114384233A (en) * | 2021-12-29 | 2022-04-22 | 中建商品混凝土有限公司 | Thixotropic property evaluation device and method for fresh concrete |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109061120A (en) * | 2018-09-30 | 2018-12-21 | 福建科之杰新材料有限公司 | Produce the test evaluation method of precast concrete lining segment concrete |
| CN109061120B (en) * | 2018-09-30 | 2021-05-04 | 科之杰新材料集团福建有限公司 | Test evaluation method for concrete for producing precast concrete lining segment |
| CN111596041A (en) * | 2019-09-02 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method and device for testing working performance of concrete under vibration action |
| CN111596040A (en) * | 2019-09-02 | 2020-08-28 | 中国铁道科学研究院集团有限公司铁道建筑研究所 | Method and device for testing concrete construction performance under vibration action |
| CN114384233A (en) * | 2021-12-29 | 2022-04-22 | 中建商品混凝土有限公司 | Thixotropic property evaluation device and method for fresh concrete |
| CN114384233B (en) * | 2021-12-29 | 2024-04-09 | 中建商品混凝土有限公司 | Thixotropic property evaluation device and method for fresh concrete |
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Address after: No. 2, Da Liu Shu Road, Haidian District, Beijing Applicant after: Railway Construction Research Institute of China Railway Research Institute Group Co., Ltd. Applicant after: China Railway Scientific Research Institute Group Co., Ltd. Address before: No. 2, Da Liu Shu Road, Haidian District, Beijing Applicant before: Railway Construction Institute of China Academy of Railway Sciences Applicant before: China Academy of Railway Sciences |
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Application publication date: 20170426 |