CN202870086U - Device for testing cement base binding material self-shrinkage and relative humidity without gravity factor - Google Patents
Device for testing cement base binding material self-shrinkage and relative humidity without gravity factor Download PDFInfo
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- CN202870086U CN202870086U CN 201220545834 CN201220545834U CN202870086U CN 202870086 U CN202870086 U CN 202870086U CN 201220545834 CN201220545834 CN 201220545834 CN 201220545834 U CN201220545834 U CN 201220545834U CN 202870086 U CN202870086 U CN 202870086U
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Abstract
The utility model relates to a testing device for researching size stability of composite cement paste, mortar and concrete. A device for testing cement base binding material self-shrinkage and relative humidity without gravity factor is characterized by comprising a testing bracket, a corrugated pipe mold and a self-turning device, wherein the testing bracket is fixed above the self-turning device; and the corrugated pipe mold is installed on the testing bracket. By utilizing the device, the differences of the moisture and the humidity of the upper and lower parts of a test piece in a corrugated pipe are effectively avoided, and the moisture and the humidity inside the test piece in the corrugated pipe are uniform and identical, so that consistency in uniformity, compactness and shrinkage of the test piece in the corrugated pipe is ensured, and the self-shrinkage of the test piece can be accurately and effectively tested; and meanwhile the time-dependent change of the relative humidity of the test piece inside the corrugated pipe can be tested, and the relationship between the self-shrinkage and the relative humidity of the test can be well illustrated.
Description
Technical field
The utility model relates to a kind of only test unit of slurry, mortar and volume stability of concrete of complex cement of studying, and especially relates to a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor.
Background technology
Since the nineties in 20th century, along with the widespread use of high-strength concrete, concrete self-constriction phenomenon causes people's concern gradually.In engineering practice, find that the self-constriction phenomenon of high-strength concrete, self-compacting concrete and mass concrete is very obvious.
The method of testing of at present cement concrete self-constriction mainly is divided into two kinds: a kind of is the volume change of test test specimen; Another kind is the tensile strain rate of test test specimen.The advantage of volume change method of testing is can test immediately after the cast, but the volume change method of testing is because cement slurry surface bleeding or entrained air can make the container Contact of grout and flexible unstable; Simultaneously in its hydration process, because water is sucked into cement slurry, thereby can produce chemical shrinkage, the minimizing meeting of internal volume is regarded as the minimizing of external volume mistakenly, thus to survey the self-constriction data bigger than normal.The advantage of tensile strain rate method of testing is that measurement point can anchoring after the slurry test, and shortcoming is the length before can not measuring cement slurry and condensing.
The advantage of comprehensive two kinds of methods, at present domestic and international more employing bellow mold method test self-constriction, before condensing, this mould in fact has been transformed into linear deformation with cubic deformation, can begin to test the lineal measure of test specimen before building.But the interior test specimen of the corrugated tube that adopts fold shape is because self gravitation should rise moisture, causes the interior test specimen top and the bottom of corrugated tube moisture distribution inhomogeneous, and degree of hydration, test specimen packing and shrinkage value are inconsistent; Simultaneously, when adopting at present the self-constriction of corrugated tube test test specimen, should not test the rheological parameters' change with time of corrugated tube inner test piece relative humidity, be unfavorable for illustrating the relation of test specimen relative humidity and self-constriction.
Summary of the invention
The purpose of this utility model is to provide a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor, and this device can guarantee the consistance of homogeneity, density and the contraction of test specimen in the bellow mold.
For achieving the above object, technical solution adopted in the utility model is: a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor, it is characterized in that it comprises test bracket, bellow mold and rotating device, test bracket is fixed on above the rotating device, and bellow mold is installed on the test bracket.
Described test bracket comprises slidable adjustment bolt, clock gauge, the first fixing hoop, steel structure support, fixation steel plate, humidity tester, set bolt; Be fixedly connected with by steel structure support between two fixation steel plates; The center of the fixation steel plate on the left side is provided with screw, the left part of slidable adjustment bolt screws in the described screw, the center of the fixation steel plate on the right has the cavity, in the cavity of the fixation steel plate on the right of the clock gauge probe of clock gauge inserts, set bolt is fixed on clock gauge on the fixation steel plate on the right; Humidity tester is fixed on the fixation steel plate on the right by another set bolt; Bellow mold is fixed on the steel structure support by the first fixing hoop, the right-hand member of slidable adjustment bolt contacts with the pipe close of the left end of bellow mold, the left end of clock gauge probe contacts with the pipe close of the right-hand member of bellow mold, and the sensor probe of humidity tester is arranged in the circular hole of pipe close of the right-hand member of bellow mold.
Steel structure support is comprised of two girder steels, and two girder steel horizontal parallel distribute, and is positioned at the lower end of fixation steel plate.
The two ends, the left and right sides of described bellow mold are respectively equipped with pipe close, and the pipe close of right-hand member offers a circular hole that conforms to sensor probe at 1/4 diameter place, distance pipe close center.
Test bracket is fixed on the steel plate of rotating device by the second fixing hoop.
Described rotating device comprises motor, speed reduction unit, rotating shaft, steel plate, circle bar; The output shaft of motor links to each other with the input end of speed reduction unit, and the output terminal of speed reduction unit links to each other with the left end of rotating shaft; The two ends, the left and right sides of 2-24 block plate are fixed with the circle bar respectively, and the circle bar is fixed by connection strap and rotating shaft; The two ends, the left and right sides of surface of steel plate are respectively equipped with the second fixing hoop.
Described steel plate is 12.
The beneficial effects of the utility model are:
1. the rotating device in the utility model can effectively be avoided the difference of test specimen top and the bottom humidity in the bellow mold, the moisture of test specimen inside in the bellow mold is evenly distributed, thereby guarantee the consistance of homogeneity, density and the contraction of test specimen in the bellow mold; Can eliminate the gravity factor impact;
2. the humidity tester in the utility model can be tested the rheological parameters' change with time of bellow mold inner test piece relative humidity, is conducive to illustrate the relation of test specimen self-constriction and relative humidity;
3. can begin to test the lineal measure of test specimen before building, test specimen need not form removal in whole test process, is conducive to test accurately and effectively the self-constriction of test specimen, to instruct actual test and engineering.
Description of drawings
Fig. 1 is the utility model test bracket synoptic diagram.
Fig. 2 is the utility model bellow mold synoptic diagram.
Fig. 3 is the utility model rotating device synoptic diagram.
Fig. 4 is the synoptic diagram of rotating device light plate.
Among the figure: 1-slidable adjustment bolt, 2-clock gauge, the 3-the first fixing hoop, 4-girder steel, 5-fixation steel plate, 6-humidity tester, 7-sensor probe, 8-set bolt, 9-clock gauge probe, 10-bellow mold, 11-motor, 12-speed reduction unit, 13-rotating shaft, 14-steel plate, 15-circle bar, the 16-the second fixing hoop.
Embodiment
The utility model will be further described below in conjunction with accompanying drawing and case study on implementation, and certain following embodiment should not be construed as restriction of the present utility model.
As shown in Figures 1 to 4, a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor, it comprises test bracket, bellow mold and rotating device, test bracket is fixed on above the rotating device, in fill the corrugated tube test specimen of forming bellow mold be installed on the test bracket.
Described test bracket comprises slidable adjustment bolt 1, clock gauge 2, the first fixing hoop 3, steel structure support, fixation steel plate 5, humidity tester 6, set bolt 8; Be fixedly connected with [steel structure support is comprised of two girder steels (plating nobelium stainless steel) 4, and two girder steel 4 horizontal parallel distribute, and are positioned at the lower end of fixation steel plate 5] by steel structure support between two fixation steel plates 5; The center of the fixation steel plate 5 on the left side is provided with screw (left side among Fig. 1 is for left), the left part of slidable adjustment bolt 1 screws in (rotational slide adjusting bolt in the described screw, the right-hand member of slidable adjustment bolt 1 can horizontally slip), the center of the fixation steel plate 5 on the right has the cavity, in the cavity of the fixation steel plate 5 on the right of the clock gauge probe 9 of clock gauge 2 inserts, set bolt 8 is fixed on clock gauge 2 on the fixation steel plate 5 on the right; Humidity tester 6 is fixed on the fixation steel plate 5 on the right by another set bolt 8, and humidity tester 6 is positioned at clock gauge 2 next doors (depart from center position and fix a humidity tester); Bellow mold 10 is fixed on the steel structure support by the first fixing hoop 3, the right-hand member of slidable adjustment bolt 1 contacts with the pipe close of the left end of bellow mold 10, the left end of clock gauge probe 9 contacts with the pipe close of the right-hand member of bellow mold 10, and the sensor probe 7 of humidity tester 6 is arranged in the circular hole of pipe close of the right-hand member of bellow mold 10.
The two ends, the left and right sides of described bellow mold 10 are respectively equipped with pipe close, and the pipe close of right-hand member offers a circular hole that conforms to sensor probe 7 at 1/4 diameter place, distance pipe close center.The bellow mold material is even, and soft durometer is moderate.
Test bracket is fixed on the steel plate 14 of rotating device by the second fixing hoop 16.
Described rotating device comprises motor 11, speed reduction unit 12, rotating shaft 13, steel plate (for plating nobelium corrosion resistant plate) 14, circle bar 15; The output shaft of motor 11 links to each other with the input end of speed reduction unit 12, and the output terminal of speed reduction unit 12 links to each other with the left end of rotating shaft 13; With circle bar 15 fixing (the circle bar is circular), circle bar 15 is fixing by connection strap and rotating shaft 13 respectively at the two ends, the left and right sides of 2-24 block plate 14; The two ends, the left and right sides on steel plate 14 surfaces are respectively equipped with the second fixing hoop 16.Motor provides rotational power, and speed reduction unit is regulated the rotating shaft rotating speed, and rotating shaft drives test bracket and steel plate rotates to rotate with speed.
Described rotating device is provided with on the every block plate 14 of 12 block plate 14(test bracket all is housed).
Utilize initial length and the length variations of clock gauge test hardened cement concrete sample, the range of clock gauge and precision can be adjusted according to concrete testing requirements.Regulate the slidable adjustment bolt, make the corrugated tube test specimen be in suitable range position.
Utilize the rheological parameters' change with time of the relative humidity of phase humidity tester test hardened cement concrete sample inside.
Behind the forming corrugated tube test specimen humidity sensor probe is put into test inside by the pipe close of offering circular hole, be placed on the test bracket after with vaseline it being sealed, in 20 ± 2 ℃ of fog room maintenances of constant temperature, the length of test specimen is as just long during with initial set.
Rotating shaft 13 rotating speeds in the rotating device described in the technical program should not be crossed slow and too fast, and according to actual conditions regulating electric machine 11 and speed reduction unit 12, the rotating speed of initial setting rotating shaft 13 is 15r/min.
Using method: at first the end with bellow mold 10 bonds firmly with the pipe close jam-pack of not perforate and with glue, then cement or the concrete that stirs poured in the bellow mold 10, then with the pipe close jam-pack other end of offering circular hole and firm with the glue bonding; The bellow mold 10 of forming is placed on 20 ± 2 ℃ of fog room maintenances of constant temperature immediately, humidity tester sensor probe 7 is put into test inside by the pipe close of offering circular hole, with vaseline it is sealed; Regulate slidable adjustment bolt 1 clock gauge probe 9 is contacted with pipe close, the length of test specimen is as just long during with initial set; Test bracket is fixed on the steel plate 14 of rotating device, then bellow mold 10 test specimens with forming are contained on the test bracket; During on-test, open motor 11 and speed reduction unit 12, bellow mold 10 test specimens will be with the speed of 15r/min along with rotating shaft 13 is rotated; Read when shrinking numerical value, close motor 11, record the shrinkage value in each length of time.Every the changing value of 1h test sample length, along with the prolongation of curing age, suitably reduce testing time in early days.The calculating of self-constriction, each curing age self-constriction deformation rate St of test specimen presses following formula (1) and calculates:
St=（Lt-L0）/L×100%
In the formula: the self-constriction deformation rate (%) in St-t length of time;
The initial length of L0-test specimen (mm);
The Lt-test specimen is the length (mm) during t in the length of time;
The effective length of L-test specimen (250mm).
Claims (7)
1.
OnePlant cement-based gelling material self-constriction and the relative humidity proving installation of eliminating gravity factor, it is characterized in that it comprises test bracket, bellow mold and rotating device, test bracket is fixed on above the rotating device, and bellow mold is installed on the test bracket.
2. a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor according to claim 1, it is characterized in that: described test bracket comprises slidable adjustment bolt (1), clock gauge (2), the first fixing hoop (3), steel structure support, fixation steel plate (5), humidity tester (6), set bolt (8); Be fixedly connected with by steel structure support between two fixation steel plates (5); The center of the fixation steel plate on the left side (5) is provided with screw, the left part of slidable adjustment bolt (1) screws in the described screw, the center of the fixation steel plate (5) on the right has the cavity, in the cavity of the fixation steel plate (5) on the right of the clock gauge probe (9) of clock gauge (2) inserts, set bolt (8) is fixed on clock gauge (2) on the fixation steel plate (5) on the right; Humidity tester (6) is fixed on the fixation steel plate (5) on the right by another set bolt (8); Bellow mold (10) is fixed on the steel structure support by the first fixing hoop (3), the right-hand member of slidable adjustment bolt (1) contacts with the pipe close of the left end of bellow mold (10), the left end of clock gauge probe (9) contacts with the pipe close of the right-hand member of bellow mold (10), and the sensor probe (7) of humidity tester (6) is arranged in the circular hole of pipe close of the right-hand member of bellow mold (10).
3. a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor according to claim 2, it is characterized in that: steel structure support is comprised of two girder steels (4), two girder steels (4) horizontal parallel distributes, and is positioned at the lower end of fixation steel plate (5).
4. a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor according to claim 1, it is characterized in that: the two ends, the left and right sides of described bellow mold (10) are respectively equipped with pipe close, and the pipe close of right-hand member offers a circular hole that conforms to sensor probe (7) at 1/4 diameter place, distance pipe close center.
5. a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor according to claim 1, it is characterized in that: test bracket is fixed on the steel plate (14) of rotating device by the second fixing hoop (16).
6. a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor according to claim 1 is characterized in that: described rotating device comprises motor (11), speed reduction unit (12), rotating shaft (13), steel plate (14), circle bar (15); The output shaft of motor (11) links to each other with the input end of speed reduction unit (12), and the output terminal of speed reduction unit (12) links to each other with the left end of rotating shaft (13); The two ends, the left and right sides of 2-24 block plate (14) are fixing with circle bar (15) respectively, and circle bar (15) is fixing by connection strap and rotating shaft (13); The two ends, the left and right sides on steel plate (14) surface are respectively equipped with the second fixing hoop (16).
7. a kind of cement-based gelling material self-constriction and relative humidity proving installation of eliminating gravity factor according to claim 6, it is characterized in that: described steel plate (14) is 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220545834 CN202870086U (en) | 2012-10-24 | 2012-10-24 | Device for testing cement base binding material self-shrinkage and relative humidity without gravity factor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201220545834 CN202870086U (en) | 2012-10-24 | 2012-10-24 | Device for testing cement base binding material self-shrinkage and relative humidity without gravity factor |
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| CN202870086U true CN202870086U (en) | 2013-04-10 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN 201220545834 Expired - Lifetime CN202870086U (en) | 2012-10-24 | 2012-10-24 | Device for testing cement base binding material self-shrinkage and relative humidity without gravity factor |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472212A (en) * | 2013-09-27 | 2013-12-25 | 东南大学 | Method of measuring drying shrinkage and creep of constant-strength cementing material |
| CN109946440A (en) * | 2019-03-25 | 2019-06-28 | 广东工业大学 | A kind of measuring device and method of self-compacting concrete self-constriction amount |
| CN112698014A (en) * | 2020-12-21 | 2021-04-23 | 三明莆炎高速公路有限责任公司 | Concrete self-contraction testing device |
| CN112743669A (en) * | 2020-12-21 | 2021-05-04 | 中国建筑科学研究院有限公司 | Fluidity concrete test piece forming test frame and test method |
| CN112763315A (en) * | 2020-12-29 | 2021-05-07 | 安徽农业大学 | Tensile/compression-bending mechanical testing device capable of carrying out environmental simulation |
| CN113155585A (en) * | 2021-04-06 | 2021-07-23 | 浙江省交通运输科学研究院 | Method for testing self-shrinkage performance of cement-based material |
| CN114594239A (en) * | 2022-03-08 | 2022-06-07 | 信阳职业技术学院 | Cement-based material shrinkage stress detection device |
-
2012
- 2012-10-24 CN CN 201220545834 patent/CN202870086U/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103472212A (en) * | 2013-09-27 | 2013-12-25 | 东南大学 | Method of measuring drying shrinkage and creep of constant-strength cementing material |
| CN109946440A (en) * | 2019-03-25 | 2019-06-28 | 广东工业大学 | A kind of measuring device and method of self-compacting concrete self-constriction amount |
| CN112698014A (en) * | 2020-12-21 | 2021-04-23 | 三明莆炎高速公路有限责任公司 | Concrete self-contraction testing device |
| CN112743669A (en) * | 2020-12-21 | 2021-05-04 | 中国建筑科学研究院有限公司 | Fluidity concrete test piece forming test frame and test method |
| CN112763315A (en) * | 2020-12-29 | 2021-05-07 | 安徽农业大学 | Tensile/compression-bending mechanical testing device capable of carrying out environmental simulation |
| CN113155585A (en) * | 2021-04-06 | 2021-07-23 | 浙江省交通运输科学研究院 | Method for testing self-shrinkage performance of cement-based material |
| CN114594239A (en) * | 2022-03-08 | 2022-06-07 | 信阳职业技术学院 | Cement-based material shrinkage stress detection device |
| CN114594239B (en) * | 2022-03-08 | 2023-08-08 | 信阳职业技术学院 | Cement-based material shrinkage stress detection device |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130410 |
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| CX01 | Expiry of patent term |