CN109991263B - Shrinkage test method of ultra-high performance concrete - Google Patents
Shrinkage test method of ultra-high performance concrete Download PDFInfo
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- CN109991263B CN109991263B CN201910276935.5A CN201910276935A CN109991263B CN 109991263 B CN109991263 B CN 109991263B CN 201910276935 A CN201910276935 A CN 201910276935A CN 109991263 B CN109991263 B CN 109991263B
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- 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
Abstract
The invention relates to a shrinkage test method of ultra-high performance concrete, which comprises the following steps: providing a test mold, pouring ultra-high performance concrete into the test mold, and reserving a set distance between the top surface of the poured ultra-high performance concrete and the top surface of the test mold; placing the test mold into a box body provided with a temperature control device, pouring sealing oil into the box body and enabling the sealing oil to submerge the top of the test mold, and keeping the temperature of the sealing oil constant through the temperature control device; starting a testing instrument, and detecting the shrinkage rate of the ultra-high performance concrete; and when the ultra-high performance concrete enters the hydration stage, closing the temperature control device, and monitoring the temperature of the sealing oil and the shrinkage rate at the corresponding temperature. The invention effectively solves the problem of difficult shrinkage test of the ultra-high performance concrete, realizes the monitoring of the whole process shrinkage of the ultra-high performance concrete, obtains the real shrinkage rule of the ultra-high performance concrete, and has better guiding significance for the actual construction.
Description
Technical Field
The invention relates to the field of building construction, in particular to a shrinkage test method for ultrahigh-performance concrete.
Background
The ultra-high performance concrete is a novel fiber reinforced cement-based material developed in the last two decades, has been widely applied to bridge engineering and high-rise buildings due to the ultra-high mechanical property and durability, and has larger shrinkage rate compared with common concrete, so that accurate shrinkage test must be carried out on the ultra-high performance concrete to exert the performance advantages of the ultra-high performance concrete in engineering application, and the maintenance process during construction is guided by the shrinkage test.
At present, the shrinkage test of the ultra-high performance concrete is mainly divided into two parts, namely temperature shrinkage and self-shrinkage, wherein the temperature shrinkage is the shrinkage generated in the cooling stage of the concrete, and the self-shrinkage is the volume change caused by the hydration reaction of the concrete, the prior art generally adopts a non-contact method, the method requires that a sample is immediately sent into a constant temperature and humidity chamber after the molding is finished during the test, and a test piece is immediately sealed by a plastic film after the pouring of the test piece is finished during the self-shrinkage test, but in the practical application, the constant temperature and humidity effect difference of a laboratory is large, various environmental influence factors are more, the data accuracy of the relation between the shrinkage rate and the time is poorer, so the correspondingly obtained shrinkage rule has larger difference with the real shrinkage rule, in addition, the plastic film only can prevent the problem of drying and evaporation of the concrete, but the ultra-high performance concrete can generate a large amount of hydration heat compared with the common concrete, larger temperature variations will also affect the overall test curve.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a shrinkage test method for ultra-high performance concrete, solves the problem of difficulty in the shrinkage test of the ultra-high performance concrete, realizes the monitoring of the whole process shrinkage of the ultra-high performance concrete, obtains the real shrinkage rule of the ultra-high performance concrete, and has better guiding significance for actual construction.
The technical scheme for realizing the purpose is as follows:
the invention provides a shrinkage test method of ultra-high performance concrete, which comprises the following steps:
s11, providing a test mold, pouring ultra-high performance concrete into the test mold, and reserving a set distance between the top surface of the poured ultra-high performance concrete and the top surface of the test mold;
s12, mounting a sensor on the test mold, and electrically connecting the sensor with a test instrument;
s13, placing the test mold into a box body provided with a temperature control device, pouring sealing oil into the box body, wherein the liquid level elevation of the sealing oil is higher than the top elevation of the test mold, and arranging the temperature control device to enable the temperature of the sealing oil to be kept at a set temperature;
s14, starting a testing instrument, and monitoring the shrinkage rate of the ultra-high performance concrete in constant-temperature sealing oil;
and S15, when the ultra-high performance concrete enters a hydration stage, closing the temperature control device, and monitoring the temperature of the sealing oil and the shrinkage rate of the ultra-high performance concrete at the corresponding temperature by using a test instrument until the shrinkage rate of the ultra-high performance concrete does not change.
The shrinkage test method of the ultrahigh-performance concrete is adopted to detect the shrinkage rate of the ultrahigh-performance concrete, a test mould is put into sealing oil, a temperature control device is used for controlling the temperature of the sealing oil, the shrinkage condition of the ultrahigh-performance concrete under the conditions of constant temperature and constant humidity in the plastic shrinkage stage is further measured, the temperature control device is closed when the shrinkage rate of the ultrahigh-performance concrete does not oscillate and fluctuate any more, namely the ultrahigh-performance concrete enters the hydration stage, the temperature change and the shrinkage rate of the ultrahigh-performance concrete at the corresponding temperature are monitored only by a test instrument, finally, the shrinkage change rule of the ultrahigh-performance concrete is obtained, the shrinkage change rule of the ultrahigh-performance concrete at different temperatures is measured by setting different temperatures, the problem of difficulty in the shrinkage test of the ultrahigh-performance concrete is effectively solved, and the full-process shrinkage monitoring of the ultrahigh-performance concrete is realized, the real contraction rule of the ultra-high performance concrete is obtained, and the method has better guiding significance for actual construction.
The shrinkage test method of the ultra-high performance concrete is further improved in that the method further comprises the following steps:
and drawing a shrinkage performance curve of the ultra-high performance concrete according to the shrinkage rate monitored by the testing instrument.
The shrinkage test method for the ultra-high performance concrete is further improved in that when the ultra-high performance concrete is poured, the ultra-high performance concrete is poured to a position 4cm below the elevation of the top of the test mold.
The shrinkage test method of the ultra-high performance concrete is further improved in that before the ultra-high performance concrete is poured into the test mold, the method further comprises the following steps:
providing reflecting targets, oppositely and vertically arranging the reflecting targets on the inner wall of the test mold, wherein the top parts of the reflecting targets are partially positioned outside the test mold, and the reflecting targets and the test mold enclose to form an ultrahigh-performance concrete pouring space;
elastically connecting the reflecting target with the corresponding side wall of the test mold;
when the sensor is installed, the sensor is fixedly arranged on the test mold, the sensing head of the sensor and the top of the reflection target exposed out of the test mold are arranged oppositely, and then the displacement change of the reflection target is detected through the sensing head.
The shrinkage test method of the ultra-high performance concrete is further improved in that the method also comprises the step of determining that the ultra-high performance concrete enters a hydration stage, and the method comprises the following steps:
providing a plurality of groups of test molds to carry out the experiments from the step S11 to the step S14, and acquiring the shrinkage rate of each group of test molds in constant-temperature sealing oil as experimental data;
analyzing the experimental data and finding out the demarcation point of the shock fluctuation and the uniform change of the ultra-high performance concrete in the constant-temperature sealing oil;
and calculating the average value of the time points corresponding to the demarcation points in the multiple groups of experiments, and taking the calculated average value as the time for the ultrahigh-performance concrete to enter the hydration stage.
The shrinkage test method of the ultra-high performance concrete is further improved in that the method further comprises the following steps:
the number of the test molds is two, two groups of shrinkage rates are correspondingly obtained, two ultra-high performance concrete shrinkage performance curves are respectively drawn according to the two groups of shrinkage rates, and the two curves are compared to mutually verify and eliminate errors generated by experimental instruments.
The shrinkage test method of the ultra-high performance concrete is further improved in that the sealing oil is edible oil.
Drawings
FIG. 1 is a flow chart of the shrinkage test method of the ultra-high performance concrete of the present invention.
FIG. 2 is a graph showing the shrinkage rate of the ultra-high performance concrete in the plastic phase versus time in the shrinkage test method of the ultra-high performance concrete of the present invention.
FIG. 3 is a graph showing the shrinkage rate of the ultra-high performance concrete in the whole shrinkage stage and the time in the shrinkage test method of the ultra-high performance concrete of the present invention.
Detailed Description
The invention is further described with reference to the following figures and specific examples.
Referring to fig. 1, the invention provides a shrinkage test method of ultra-high performance concrete, comprising the steps of placing a test mold in sealing oil, controlling the temperature of the sealing oil by using a temperature control device, further measuring the shrinkage condition of the ultra-high performance concrete under the conditions of constant temperature and constant humidity in the plastic shrinkage stage, closing the temperature control device when the shrinkage ratio of the ultra-high performance concrete does not oscillate and fluctuate any more, namely the ultra-high performance concrete enters the hydration stage, monitoring the temperature change and the shrinkage ratio of the ultra-high performance concrete at corresponding temperature by using a test instrument, finally obtaining the shrinkage change rule of the ultra-high performance concrete, measuring the shrinkage change rule of the ultra-high performance concrete at different temperatures by setting different temperatures, effectively solving the problem of difficult shrinkage test of the ultra-high performance concrete, realizing the monitoring of the shrinkage of the ultra-high performance concrete in the whole process, the real contraction rule of the ultra-high performance concrete is obtained, and the method has better guiding significance for actual construction. The shrinkage test method of the ultra-high performance concrete of the present invention will be described with reference to the accompanying drawings.
Referring to fig. 1, fig. 1 is a flow chart illustrating a shrinkage testing method of ultra-high performance concrete according to the present invention. The shrinkage test method of the ultra-high performance concrete of the present invention will be described with reference to fig. 1.
As shown in fig. 1, 2 and 3, the shrinkage test method of the ultra-high performance concrete of the present invention comprises the steps of:
step S11, providing a test mold, pouring ultra-high performance concrete into the test mold, and reserving a set distance between the top surface of the poured ultra-high performance concrete and the top surface of the test mold; then, step S12 is executed
S12, installing a sensor on the test mold, and electrically connecting the sensor with a test instrument; then, step S13 is executed
Step S13, placing the test mold into a box body provided with a temperature control device, pouring sealing oil into the box body, wherein the liquid level elevation of the sealing oil is higher than the top elevation of the test mold, and arranging the temperature control device to enable the temperature of the sealing oil to be kept at a set temperature; then, step S14 is executed
Step S14, starting a testing instrument, and monitoring the shrinkage rate of the ultra-high performance concrete in the constant-temperature sealing oil; then, step S15 is executed
And S15, when the ultra-high performance concrete enters the hydration stage, closing the temperature control device, and monitoring the temperature of the sealing oil and the shrinkage rate of the ultra-high performance concrete at the corresponding temperature by using a test instrument until the shrinkage rate of the ultra-high performance concrete does not change any more.
Preferably, the method further comprises the following steps:
and drawing a shrinkage performance curve of the ultra-high performance concrete according to the shrinkage rate monitored by the testing instrument, so as to facilitate data comparison and observation summary.
In a preferred embodiment of the present invention, the ultra-high performance concrete is poured to a position 4cm below the elevation of the top of the test mold.
Preferably, the height of the test mold is 10cm, the ultra-high performance concrete is poured to the position of 6cm, when the test mold poured with the ultra-high performance concrete is placed in the sealing oil, the sealing oil can flow into the test mold and completely cover the ultra-high performance concrete, a gap which can not be filled with the sealing oil is prevented from being formed between the ultra-high performance concrete and the test mold, and water loss is prevented.
Further, before pouring the ultra-high performance concrete into the test mold, the method further comprises the following steps:
providing reflecting targets, oppositely and vertically arranging the reflecting targets on a test mold, wherein the top parts of the reflecting targets are partially positioned outside the test mold, and the reflecting targets and the test mold enclose to form an ultrahigh-performance concrete pouring space;
elastically connecting the reflecting target with the corresponding side wall of the test mold;
when the sensor is installed, the sensor is fixedly arranged on the test mold, the sensing head of the sensor and the top of the reflection target exposed out of the test mold are arranged oppositely, and then the displacement change of the reflection target is detected through the sensing head.
Specifically, one end of the reflection target is fixedly connected to the inner side wall of the test mould, the other end of the reflection target is fixedly connected with the side part corresponding to the ultra-high performance concrete block, the reflection target has certain elasticity and can move in a telescopic mode, when the ultra-high performance concrete block contracts or expands, the side part corresponding to the reflection target moves towards the direction close to the side wall of the test mould or away from the side wall of the test mould, and the probe of the sensor detects the displacement change of the reflection target so as to reflect the shrinkage rate of the ultra-high performance concrete.
Preferably, the shrinkage rate of the ultra-high performance concrete can be measured by a CABR-NES type non-contact concrete shrinkage deformation tester.
Further, the method also comprises the step of determining that the ultra-high performance concrete enters a hydration stage, and the method comprises the following steps:
providing a plurality of groups of test molds to carry out the experiments from the step S11 to the step S14, and acquiring the shrinkage rate of each group of test molds in constant-temperature sealing oil as experimental data;
analyzing the experimental data and finding out the demarcation point of the shock fluctuation and the uniform change of the ultra-high performance concrete in the constant-temperature sealing oil;
and calculating the average value of the time points corresponding to the demarcation points in the multiple groups of experiments, and taking the calculated average value as the time for the ultrahigh-performance concrete to enter the hydration stage.
Further, the method also comprises the following steps:
the two test molds are used for correspondingly obtaining two groups of shrinkage rates, two ultra-high performance concrete shrinkage performance curves are respectively drawn according to the two groups of shrinkage rates, and the two curves are compared to verify each other and eliminate errors generated by experimental instruments, so that experimental data are more real and reliable.
Preferably, the sealing oil is an edible oil.
The specific embodiment of the invention is as follows:
installing reflecting targets on the inner walls of two opposite sides of the test mold, pouring the ultra-high performance concrete mixture into the test mold, wherein the pouring height of the ultra-high performance concrete is lower than the top of the test mold, further vibrating and leveling the ultra-high performance concrete mixture, and the reflecting targets are propped against the corresponding side parts of the ultra-high performance concrete;
a sensor is arranged on a test mould poured with the ultra-high performance concrete, and a detection head of the sensor is opposite to the reflection target, so that the sensor can measure the displacement change of the reflection target, namely the shrinkage rate of the ultra-high performance concrete;
electrically connecting the sensor with a testing instrument to enable the testing instrument to receive the shrinkage change value of the ultra-high performance concrete detected by the sensor, putting the whole testing mold into the box body, and pouring edible oil into the box body until the edible oil completely submerges the testing mold, so that the ultra-high performance concrete is completely positioned in the edible oil;
installing a temperature control device in the box body to control the temperature of the edible oil, setting the temperature of the temperature control device to ensure that the test mold is at a set temperature, at the moment, the ultra-high performance concrete is in an initial plasticizing stage, and recording the shrinkage rate of the test mold;
when the ultra-high performance concrete enters a hydration stage, closing the temperature control device, and not controlling the temperature in the box body any more, and at the moment, when the ultra-high performance concrete enters the hydration stage, recording temperature change data and the corresponding shrinkage rate of the ultra-high performance concrete through a test instrument until the shrinkage rate is not changed;
drawing a shrinkage performance curve of the ultra-high performance concrete according to the corresponding shrinkage rate, combining with the graph shown in FIG. 2, wherein mu in the graph shown in FIGS. 2 and 3 represents the shrinkage rate, t represents time, the time for the ultra-high performance concrete to enter a hydration stage is generally 28h, setting a temperature control device according to the temperature during actual construction, simulating an environment close to the actual construction, making the curve, obtaining the shrinkage rule of the ultra-high performance concrete in a plastic stage, and guiding means such as pressure plastering and the like to adjust the temperature and the humidity during the actual construction to eliminate the shrinkage in the plastic stage, combining with the graph shown in FIG. 3, the shrinkage rate of the ultra-high performance concrete is greatly changed between 28h and 1500h, and determining the time period of moisture preservation and maintenance before final setting according to the curve at the hydration stage to reduce the shrinkage amount at the hydration stage.
While the present invention has been described in detail and with reference to the embodiments thereof as illustrated in the accompanying drawings, it will be apparent to one skilled in the art that various changes and modifications can be made therein. Therefore, certain details of the embodiments are not to be interpreted as limiting, and the scope of the invention is to be determined by the appended claims.
Claims (5)
1. The shrinkage test method of the ultra-high performance concrete is characterized by comprising the following steps:
s11, providing a test mold, providing reflecting targets, vertically arranging the reflecting targets in the test mold in a relative mode, wherein part of the tops of the reflecting targets are positioned outside the test mold, the reflecting targets and the test mold enclose a space for pouring ultrahigh-performance concrete, the reflecting targets are elastically connected with the corresponding side walls of the test mold, the ultrahigh-performance concrete is poured into the space, and a set distance is reserved between the top surface of the poured ultrahigh-performance concrete and the top surface of the test mold;
s12, mounting a sensor on the test mold, electrically connecting the sensor with a test instrument, fixedly arranging the sensor on the test mold, enabling a sensing head of the sensor and the reflecting target to be exposed out of the top of the test mold and oppositely arranging, and further detecting the displacement change of the reflecting target through the sensing head;
s13, placing the test mold into a box body provided with a temperature control device, pouring sealing oil into the box body, wherein the liquid level of the sealing oil is higher than the top level of the test mold, and setting the temperature control device according to the temperature during actual construction to enable the temperature of the sealing oil to be kept at a set temperature so as to simulate an environment close to the actual construction;
s14, starting the testing instrument, and monitoring the shrinkage rate of the ultra-high performance concrete in the constant-temperature sealing oil;
s15, providing a plurality of groups of test molds to carry out the experiments from the step S11 to the step S14, obtaining the shrinkage rate of each group of test molds in the constant-temperature sealing oil as experimental data, analyzing the experimental data, finding out the demarcation points of the ultra-high performance concrete in the constant-temperature sealing oil, which is subjected to oscillation fluctuation and uniform change, calculating the average value of the time points corresponding to the demarcation points in the plurality of groups of experiments, and the calculated average value is used as the time of the ultra-high performance concrete entering the hydration stage, when the ultra-high performance concrete enters the hydration stage, the temperature control device is closed, monitoring the temperature of the sealing oil and the shrinkage rate of the ultra-high performance concrete at the corresponding temperature by the testing instrument until the shrinkage rate of the ultra-high performance concrete does not change any more, thereby obtaining the contraction rule of the ultra-high performance concrete in the plasticity stage so as to guide the actual construction.
2. The shrinkage test method of ultra-high performance concrete according to claim 1, further comprising:
and drawing a shrinkage performance curve of the ultra-high performance concrete according to the shrinkage rate monitored by the testing instrument.
3. The shrinkage test method of ultra-high performance concrete according to claim 1, wherein the ultra-high performance concrete is poured to a position 4cm below the top elevation of the test mold when the ultra-high performance concrete is poured.
4. The shrinkage test method of ultra-high performance concrete according to claim 1, further comprising:
the number of the test molds is two, two groups of shrinkage rates are correspondingly obtained, two shrinkage performance curves of the ultra-high performance concrete are respectively drawn according to the two groups of shrinkage rates, and the two curves are compared to verify each other and eliminate errors generated by experimental instruments.
5. The shrinkage test method of ultra-high performance concrete according to claim 1, wherein the sealing oil is an edible oil.
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