CN109164133A - A kind of cement concrete linear expansion coefficient test device and its test method - Google Patents
A kind of cement concrete linear expansion coefficient test device and its test method Download PDFInfo
- Publication number
- CN109164133A CN109164133A CN201811002161.9A CN201811002161A CN109164133A CN 109164133 A CN109164133 A CN 109164133A CN 201811002161 A CN201811002161 A CN 201811002161A CN 109164133 A CN109164133 A CN 109164133A
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- expansion coefficient
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- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 239000004567 concrete Substances 0.000 title claims abstract description 30
- 239000004568 cement Substances 0.000 title claims abstract description 23
- 238000010998 test method Methods 0.000 title claims abstract description 14
- 238000006073 displacement reaction Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 18
- 238000000034 method Methods 0.000 claims description 8
- 229910001220 stainless steel Inorganic materials 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 6
- 238000005259 measurement Methods 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 238000012937 correction Methods 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 3
- 238000013461 design Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000008602 contraction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/16—Investigating or analyzing materials by the use of thermal means by investigating thermal coefficient of expansion
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Strength Of Materials By Application Of Mechanical Stress (AREA)
Abstract
The invention discloses a kind of linear expansion coefficient of cement concrete test device and its test methods, including resistance temperature detector, linear differential displacement sensor, support button, master bar, test bracket and bolt；The test bracket includes vertical strut, cross tube and lower plate；Wherein between cross tube, lower plate between built forming carried out by vertical strut, and height-adjustable connection is carried out by bolt；The cross tube is fixedly connected by one end of bolt and linear differential displacement sensor.The test method and its equipment operation that the present invention uses are easy, and testing result is reliable, have important practical significance to pavement of road engineer application.
Description
Technical field
Road maintenance equipment field of the present invention, and in particular to a kind of cement concrete linear expansion coefficient test device and its
Test method.
Background technique
Cement concrete is the main construction material of pavement of road, and expansion can be generated under conditions of temperature raises and reduces
And shrinkage phenomenon, expansion and contraction generate tremendous influence to the short-term and Long-Term Properties of cement concrete pavement.It influences
There are many factor of cement concrete linear expansivity energy, such as the ratio of mud, Aggregate Type and construction technology etc..Test concrete wire at present
The device is complicated for the coefficient of expansion, therefore, single numerical value is used in Pavement Design.Single design value leads to the property on many road surfaces
The difference between expected design can be showed, brings difficulty to maintenance.
Summary of the invention
To solve the above-mentioned problems, the present invention provides a kind of cement concrete linear expansion coefficient test device and its test
Method, the test method and its equipment operation that the present invention uses are easy, and testing result is reliable, has to pavement of road engineer application
Important practical significance.
Technical solution of the present invention:
A kind of linear expansion coefficient of cement concrete test device is provided, including the displacement of resistance temperature detector, linear differential passes
Sensor, support button, master bar, test bracket and bolt；The test bracket includes vertical strut, cross tube and lower plate；Its
Built forming is carried out by vertical strut between middle cross tube, lower plate, and carries out height-adjustable connection by bolt；
The cross tube is fixedly connected by one end of bolt and linear differential displacement sensor；There are three being set on the lower plate
Or three or more support knobs, and formed by equidistant arrangement be directly 5-7.6cm circle；The linear differential displacement passes
The minimum measurement accuracy of sensor is 0.00025mm；The resistance temperature detector scale precision reaches 0.01 DEG C, and can survey
Test the water temperature the temperature with 25.4 mm range inner concretes within surface of test piece；The master bar is to match, stainless by 304
The stainless steel material of steel or other kinds of known linear expansion coefficient is made；Length is ± 0.025 mm of 178 mm, diameter
For 102 mm.
Further, the vertical strut is using low-expansion alloy material.
Further, the cross tube, lower plate are using stainless steel material.
Further, the bottom plate shape can be circle, diameter 25.4cm；It or is rectangle, the ruler of length and width
Very little is 25.4 × 12.5cm.
A kind of linear expansion coefficient of cement concrete test method is provided, is 10 DEG C ~ 50 DEG C including temperature range can be contained
Water, the water surface can be higher by the sink of the above 25.4mm of bracket；
The following steps are included:
Step 1: test specimen to be tested is placed in limewash immersion 48 hours or more；Wherein lime coolant-temperature gage is (23 ± 2
DEG C), when the dry test specimen weight difference in the face at interval is less than 0.5% when 24 is small, dry surface of test piece moisture；
Step 2: the branch equipped with linear differential displacement sensor is placed in sink；
Step 3: the initial length L, exact value 0.1mm of the test specimen of moisture are dried in measurement at room temperature；
Step 4: being attached to test specimen in sink in test equipment, and test specimen bottom is placed on the circular support knob of composition, upper end and line
Property differential displacement sensor be connected；
Step 5: time interval is 1 minute when reading, while carrying out data record；
Step 6: the water in sink is down to 10 ± 1 DEG C, and is kept for 1 hour；
Step 7: water temperature is risen to 50 ± 1 DEG C in 10 minutes 2 hours, and is kept for 1 hour；
Step 8: water temperature is down to 10 ± 1 DEG C in 10 minutes 2 hours, and is kept for 1 hour；
Step 9: circulation step seven and step 8 process extremely complete 3 test processes；
Step 10: according to institute's test block length and temperature data draw length and with temperature relation figure, find out length increase and
Reduced section calculates slope.
6. a kind of linear expansion coefficient of cement concrete test method according to claim 5, it is characterised in that: the meter
Calculate the formula of slope are as follows:, in which:
CTE is the concrete wire coefficient of expansion；
M is the slope of figure bend, and unit is mm/ °C；
L is the length of test specimen, unit mm；
The correction coefficient of Cf bracket.
The technical program the utility model has the advantages that
1, easy to operate, equipment design science is easy to operate understanding to those skilled in the art.
2, testing result is reliable, overcome in Pavement Design using single numerical value cause the performance on many road surfaces with
Difference between expected design.
3, the test method and its equipment operation that the present invention uses are easy, and testing result is reliable, answers pavement of road engineering
With with important practical significance.
Detailed description of the invention
Fig. 1 is a kind of top view of linear expansion coefficient of cement concrete test device in the present invention；
Fig. 2 is a kind of bottom view of linear expansion coefficient of cement concrete test device in the present invention；
Fig. 3 is a kind of front elevation of linear expansion coefficient of cement concrete test device in the present invention；
Title and serial number in figure:
Linear differential displacement sensor 1, cross tube 2, vertical strut 3, lower plate 4, support knob 5, test specimen 6, bolt 7.
Specific embodiment
The following further describes the present invention with reference to the drawings.
Embodiment 1:
As shown in Figure 1, Figure 3, a kind of linear expansion coefficient of cement concrete test device is provided, including resistance temperature detector,
Linear differential displacement sensor, support button, master bar, test bracket and bolt；The test bracket includes vertical strut, upper cross
Bar and lower plate；Built forming is wherein carried out by vertical strut between cross tube, lower plate, and height is carried out by bolt
Adjustable connection；The cross tube is fixedly connected by one end of bolt and linear differential displacement sensor；Under described
Knob is supported there are three setting on bottom plate, and the circle directly for 5cm is formed by equidistant arrangement；The linear differential displacement sensing
The minimum measurement accuracy of device is 0.00025mm；The resistance temperature detector scale precision reaches 0.01 DEG C, and can test
The temperature of 25.4 mm range inner concretes within water temperature and surface of test piece；The master bar is to match, by 304 stainless steels
Or the stainless steel material of other kinds of known linear expansion coefficient is made；Length is ± 0.025 mm of 178 mm, and diameter is
102 mm。
The vertical strut is using low-expansion alloy material.
The cross tube, lower plate are using stainless steel material.
The bottom plate shape can be circle, diameter 25.4cm.
The technical program also provides a kind of linear expansion coefficient of cement concrete test method, including can contain temperature range and be
10 DEG C ~ 50 DEG C of water, the water surface can be higher by the sink of the above 25.4mm of bracket；
The following steps are included:
Step 1: test specimen to be tested is placed in limewash immersion 48 hours or more；Wherein lime coolant-temperature gage is (23 ± 2
DEG C), when the dry test specimen weight difference in the face at interval is less than 0.5% when 24 is small, dry surface of test piece moisture；
Step 2: the branch equipped with linear differential displacement sensor is placed in sink；
Step 3: the initial length L, exact value 0.1mm of the test specimen of moisture are dried in measurement at room temperature；
Step 4: being attached to test specimen in sink in test equipment, and test specimen bottom is placed on the circular support knob of composition, upper end and line
Property differential displacement sensor be connected；
Step 5: time interval is 1 minute when reading, while carrying out data record；
Step 6: the water in sink is down to 10 ± 1 DEG C, and is kept for 1 hour；
Step 7: water temperature is risen to 50 ± 1 DEG C in 10 minutes 2 hours, and is kept for 1 hour；
Step 8: water temperature is down to 10 ± 1 DEG C in 10 minutes 2 hours, and is kept for 1 hour；
Step 9: circulation step seven and step 8 process extremely complete 3 test processes；
Step 10: according to institute's test block length and temperature data draw length and with temperature relation figure, find out length increase and
Reduced section calculates slope.
6. a kind of linear expansion coefficient of cement concrete test method according to claim 5, it is characterised in that: the meter
Calculate the formula of slope are as follows:, in which:
CTE is the concrete wire coefficient of expansion；
M is the slope of figure bend, and unit is mm/ °C；
L is the length of test specimen, unit mm；
The correction coefficient of Cf bracket.
Embodiment 2:
As shown in Fig. 2, the present embodiment difference from example 1 is that: set on the lower plate there are six support knob, and
The circle directly for 7.6cm is formed by equidistant arrangement.
It is pointed out that the technical concepts and features of above-described embodiment only to illustrate the invention, it is ripe its object is to allow
The personage for knowing technique cans understand the content of the present invention and implement it accordingly, and protection model of the invention can not be limited with this
It encloses.Any equivalent change or modification in accordance with the spirit of the invention should be covered by the protection scope of the present invention.
Claims (6)
1. a kind of linear expansion coefficient of cement concrete test device, it is characterised in that: including resistance temperature detector, linear poor
Dynamic displacement sensor, support button, master bar, test bracket and bolt；
The test bracket includes vertical strut, cross tube and lower plate；Wherein between cross tube, lower plate between by supportting vertically
Bar carries out built forming, and height-adjustable connection is carried out by bolt；
The cross tube is fixedly connected by one end of bolt and linear differential displacement sensor；
Set on the lower plate there are three or three or more support knobs, and being formed by equidistant arrangement is directly 5-7.6cm
Circle；
The minimum measurement accuracy of the linear differential displacement sensor is 0.00025mm；
The resistance temperature detector scale precision reaches 0.01 DEG C, and can test 25.4 within water temperature and surface of test piece
The temperature of mm range inner concrete；
The master bar is to match, by 304 stainless steels or the stainless steel material of other kinds of known linear expansion coefficient
It is made；Length is ± 0.025 mm of 178 mm, and diameter is 102 mm.
2. a kind of linear expansion coefficient of cement concrete test device according to claim 1, it is characterised in that: described vertical
Strut is using low-expansion alloy material.
3. a kind of linear expansion coefficient of cement concrete test device according to claim 1, it is characterised in that: the upper cross
Bar, lower plate are using stainless steel material.
4. a kind of linear expansion coefficient of cement concrete test device according to claim 1, it is characterised in that: the bottom
Plate shape can be circle, diameter 25.4cm；Or be rectangle, the size of length and width is 25.4 × 12.5cm.
5. a kind of linear expansion coefficient of cement concrete test method, which is characterized in that including can contain temperature range be 10 DEG C ~ 50
DEG C water, the water surface can be higher by the sink of the above 25.4mm of bracket；
The following steps are included:
Step 1: test specimen to be tested is placed in limewash immersion 48 hours or more；Wherein lime coolant-temperature gage is (23 ± 2
DEG C), when the dry test specimen weight difference in the face at interval is less than 0.5% when 24 is small, dry surface of test piece moisture；
Step 2: the branch equipped with linear differential displacement sensor is placed in sink；
Step 3: the initial length L, exact value 0.1mm of the test specimen of moisture are dried in measurement at room temperature；
Step 4: being attached to test specimen in sink in test equipment, and test specimen bottom is placed on the circular support knob of composition, upper end and line
Property differential displacement sensor be connected；
Step 5: time interval is 1 minute when reading, while carrying out data record；
Step 6: the water in sink is down to 10 ± 1 DEG C, and is kept for 1 hour；
Step 7: water temperature is risen to 50 ± 1 DEG C in 10 minutes 2 hours, and is kept for 1 hour；
Step 8: water temperature is down to 10 ± 1 DEG C in 10 minutes 2 hours, and is kept for 1 hour；
Step 9: circulation step seven and step 8 process extremely complete 3 test processes；
Step 10: according to institute's test block length and temperature data draw length and with temperature relation figure, find out length increase and
Reduced section calculates slope.
6. a kind of linear expansion coefficient of cement concrete test method according to claim 5, it is characterised in that: the calculating slope
Formula are as follows:, in which:
CTE is the concrete wire coefficient of expansion；
M is the slope of figure bend, and unit is mm/ °C；
L is the length of test specimen, unit mm；
CfThe correction coefficient of bracket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002161.9A CN109164133A (en) | 2018-08-30 | 2018-08-30 | A kind of cement concrete linear expansion coefficient test device and its test method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811002161.9A CN109164133A (en) | 2018-08-30 | 2018-08-30 | A kind of cement concrete linear expansion coefficient test device and its test method |
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| Publication Number | Publication Date |
|---|---|
| CN109164133A true CN109164133A (en) | 2019-01-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811002161.9A Pending CN109164133A (en) | 2018-08-30 | 2018-08-30 | A kind of cement concrete linear expansion coefficient test device and its test method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858091A (en) * | 2020-12-31 | 2021-05-28 | 厦门市宜帆达新材料有限公司 | Density and expansion coefficient testing tool and testing method thereof |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865865A (en) * | 2010-06-12 | 2010-10-20 | 水利部交通运输部国家能源局南京水利科学研究院 | Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof |
| CN103293179A (en) * | 2013-05-20 | 2013-09-11 | 江家嘉 | Device and method for testing early thermal expansion coefficient of concrete based on suspension method |
| CN103558246A (en) * | 2013-11-08 | 2014-02-05 | 山东大学 | Testing device and method for expansion coefficient of cement concrete for road surface |
| CN203551488U (en) * | 2013-11-08 | 2014-04-16 | 山东大学 | Pavement cement concrete expansion coefficient testing device |
| CN103983658A (en) * | 2014-05-21 | 2014-08-13 | 航天材料及工艺研究所 | Fiber medium-temperature longitudinal coefficient-of-linear-expansion testing device |
-
2018
- 2018-08-30 CN CN201811002161.9A patent/CN109164133A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101865865A (en) * | 2010-06-12 | 2010-10-20 | 水利部交通运输部国家能源局南京水利科学研究院 | Noncontact-type test method of early-period thermal expansion coefficient of concrete dam and equipment thereof |
| CN103293179A (en) * | 2013-05-20 | 2013-09-11 | 江家嘉 | Device and method for testing early thermal expansion coefficient of concrete based on suspension method |
| CN103558246A (en) * | 2013-11-08 | 2014-02-05 | 山东大学 | Testing device and method for expansion coefficient of cement concrete for road surface |
| CN203551488U (en) * | 2013-11-08 | 2014-04-16 | 山东大学 | Pavement cement concrete expansion coefficient testing device |
| CN103983658A (en) * | 2014-05-21 | 2014-08-13 | 航天材料及工艺研究所 | Fiber medium-temperature longitudinal coefficient-of-linear-expansion testing device |
Non-Patent Citations (1)
| Title |
|---|
| 钱文勋，等: "大坝混凝土早期热膨胀系数试验研究" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112858091A (en) * | 2020-12-31 | 2021-05-28 | 厦门市宜帆达新材料有限公司 | Density and expansion coefficient testing tool and testing method thereof |
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Application publication date: 20190108 |