CN112067401B - Method for determining strength maintenance age of structural entity concrete - Google Patents
Method for determining strength maintenance age of structural entity concrete Download PDFInfo
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- CN112067401B CN112067401B CN202011006453.7A CN202011006453A CN112067401B CN 112067401 B CN112067401 B CN 112067401B CN 202011006453 A CN202011006453 A CN 202011006453A CN 112067401 B CN112067401 B CN 112067401B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N3/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N3/08—Investigating strength properties of solid materials by application of mechanical stress by applying steady tensile or compressive forces
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
- G01N2203/0001—Type of application of the stress
- G01N2203/0003—Steady
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2203/00—Investigating strength properties of solid materials by application of mechanical stress
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention relates to the field of building construction, and aims to solve the problems that an equivalent curing age method specified in the conventional concrete structure engineering construction quality acceptance specification can produce misjudgment on the strength of a solid structure and has larger error in practical engineering application, and provides a structural entity concrete strength curing age determining method, which comprises the following steps: preparing a sufficient number of test pieces; placing the N groups of test pieces into a standard curing room for curing, and naturally curing the rest test pieces in an open air field; measuring and recording the strength measured by the test at 28 days of curing age; measuring the strength of a test piece every day after the 28-day age, and marking points determined by the accumulated temperature, the accumulated humidity and the strength value of each day in a three-dimensional coordinate system; and curing meets the requirement when the accumulated temperature and the accumulated humidity of the structural entity curing meet the requirement of equivalent conditions. The invention has the beneficial effects that the equivalent conditions and equivalent age of the structural entity and the standard maintenance test piece can be accurately determined.
Description
Technical Field
The invention relates to the field of constructional engineering, in particular to a method for determining the strength maintenance age of structural entity concrete.
Background
10.1.2 regulations in the acceptance Specification of construction quality of concrete Structure engineering GB 50204-2015: the equivalent curing age is the corresponding age when the average daily air temperature reaches 600 ℃ in a cumulative way day by day in the concrete structure entity strength test.
The method for accumulating the strength age of the structural entity according to the daily average air temperature to 600 ℃ is defective, only the influence of the temperature on the increase of the coagulation strength is considered, the influence of the relative humidity on the increase of the coagulation strength is not considered, the humidities of all regions of the country are different, the different humidities in seasons are also different, and the concrete strength is different when the temperature is accumulated to 600 ℃.
When the average temperature of the test piece in spring and autumn in China is 22 ℃, the test piece is maintained for 27.3 days under the same condition, the temperature accumulation reaches 600 ℃, at this time, the strength of the structural entity is not in equal relation with the strength of a standard maintenance test piece, the standard maintenance condition is that the temperature is 20+/-2 ℃, the relative humidity is more than 95%, under the condition that the time is the same, the structural entity has a temperature accumulation to 600 ℃, but the humidity under natural conditions is too different from the humidity under standard conditions, and the strength of the concrete maintained under two different humidity conditions is different and cannot be equivalent.
The curing humidity of the test piece under the same condition is far lower than the standard curing humidity, two necessary conditions of the cement hydration reaction are temperature and humidity, only the temperature accumulation is carried out on the curing age of the test piece under the same condition in the quality inspection standard, and the effect of the humidity on the increase of the concrete strength is not considered, so that the method of only accumulating the temperature to 600 ℃ daily is used as the equivalent standard curing age, has the great defect, can produce misjudgment on the physical structure strength in practical engineering application, and especially can misjudge that the structural entity strength is lower than the standard curing test piece strength, and judges that the physical structure quality is unqualified, thereby causing unnecessary detection.
Disclosure of Invention
The invention aims to provide a method for determining the curing age of the concrete strength of a structural entity, which aims to solve the problems that the method for determining the equivalent curing age specified in the conventional concrete structural engineering construction quality acceptance specification can produce misjudgment on the strength of the structural entity in actual engineering application and has larger error.
Embodiments of the present invention are implemented as follows:
a method for determining the strength curing age of structural entity concrete comprises the following steps:
preparing a sufficient number of test pieces;
placing N groups of test pieces into a standard curing room for curing, wherein N is an integer more than 1, and naturally curing the rest test pieces in an open field;
recording the temperature and the humidity of natural maintenance every day, and respectively calculating the data value of the temperature and the accumulated value of the humidity;
when the curing age is 28 days, respectively taking N groups of standard curing test pieces and N groups of natural curing test pieces for compression tests, and recording the strength measured by the tests; comparing the difference between the average intensity value of the N groups of standard maintenance test pieces and the average intensity value of the N groups of natural maintenance test pieces;
after 28 days of age, taking N groups of natural curing test pieces for compression test every day, and comparing the measured average value of the intensities of the N groups of natural curing test pieces with the average value of the intensities of the standard curing test pieces measured in 28 days; marking points determined by the accumulated temperature and the accumulated humidity of each day and the average value of the strength of the natural curing test piece measured on the same day in a three-dimensional coordinate system;
when the difference value between the average value of the natural curing test piece strength and the average value of the standard curing test piece strength is within the allowable error range, judging that the natural curing test piece strength is equivalent to the standard curing test piece strength, and taking the accumulated temperature value and humidity value as the equivalent condition of the structural entity strength and the standard curing test piece strength;
when the method is applied, the accumulated temperature and the accumulated humidity of the maintenance of the structural entity are required to meet the requirement of equivalent conditions at the same time.
According to the scheme, the corresponding relation between the strength of the structural entity and the strength of the standard curing test piece can be accurately reflected according to the cement hydration process mechanism and the concrete structural entity curing condition, and the equivalent condition and the equivalent age of the structural entity and the standard curing test piece are determined.
In one embodiment:
and respectively obtaining the equivalent conditions in spring and autumn, summer and winter, and confirming the accumulated temperature and the accumulated humidity requirement of the structural entity maintenance by using the corresponding equivalent conditions in the corresponding seasons.
The same intensity value corresponds to countless different temperature and humidity points in the three-dimensional space, so that corresponding equivalent age can be found under the condition that the temperature and humidity of each season and each region are different. The humidity of each place is different in the whole country, the humidity of different seasons is also different, and the concrete strength is different when the temperature is accumulated to 600 ℃. So that the intensity is equivalent if the simply accumulated temperature reaches the standard curing temperature. And the equivalent conditions of each season are obtained respectively, so that the method has more accurate guiding value.
In one embodiment:
n takes a value of 5-10.
In one embodiment:
n takes a value of 5.
In one embodiment:
and connecting points determined by the accumulated temperature, the accumulated humidity and the average value of the strength of the natural maintenance test piece measured on the same day into fold lines or fitting the fold lines and the average value into spline curves.
In one embodiment:
the three-dimensional coordinate system is a space rectangular coordinate system, wherein two coordinate axes of the bottom surface are respectively a temperature accumulated value coordinate and a humidity accumulated value coordinate, and the vertical coordinate is an intensity value coordinate.
In one embodiment:
the test pieces are 1000 groups in total and are manufactured by pouring after mixing and stirring medium sand, broken stone, cement, polycarboxylic acid additive and fly ash.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings mentioned in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and should not be considered as limiting the scope, and that other related drawings can be obtained according to these drawings without the inventive effort of a person skilled in the art.
Fig. 1 shows a curve in a standard curing state;
FIG. 2 shows a spring and autumn equivalent age curve in the adult region;
the summer equivalent age curve for the adult region is shown in fig. 3;
fig. 4 shows a winter equivalent age curve for a capital region.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. The components of the embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Examples
The embodiment provides a method for determining the strength curing age of structural entity concrete, which comprises the following steps:
preparing a sufficient number of test pieces; in the embodiment, 1000 groups of test pieces are prepared by mixing and stirring medium sand, broken stone, cement, polycarboxylic acid additive and fly ash and pouring;
placing N groups of test pieces into a standard curing room for curing, wherein N is an integer more than 1, and naturally curing the rest test pieces in an open field; generally, N can take a value of 5-10, for example, N takes a value of 5 in the present embodiment;
recording the temperature and the humidity of natural maintenance every day, and respectively calculating the data value of the temperature and the accumulated value of the humidity;
when the curing age is 28 days, respectively taking N groups of standard curing test pieces and N groups of natural curing test pieces for compression tests, and recording the strength measured by the tests; comparing the difference between the average intensity value of the N groups of standard maintenance test pieces and the average intensity value of the N groups of natural maintenance test pieces;
after 28 days of age, taking N groups of natural curing test pieces for compression test every day, and comparing the measured average value of the intensities of the N groups of natural curing test pieces with the average value of the intensities of the standard curing test pieces measured in 28 days; marking points determined by the accumulated temperature and the accumulated humidity of each day and the average value of the strength of the natural curing test piece measured on the same day in a three-dimensional coordinate system; in the embodiment, points determined by the accumulated temperature, the accumulated humidity and the average value of the strength of the natural maintenance test piece measured on the same day are connected into a spline curve; in other embodiments, a multi-segment polyline may also be fitted; the three-dimensional coordinate system is a space rectangular coordinate system, wherein two coordinate axes of the bottom surface are respectively a temperature accumulated value coordinate and a humidity accumulated value coordinate, and the vertical coordinate is an intensity value coordinate;
when the difference value between the average value of the natural curing test piece strength and the average value of the standard curing test piece strength is within the allowable error range, judging that the natural curing test piece strength is equivalent to the standard curing test piece strength, and taking the accumulated temperature value and humidity value as the equivalent condition of the structural entity strength and the standard curing test piece strength;
when the method is applied, the accumulated temperature and the accumulated humidity of the maintenance of the structural entity are required to meet the requirement of equivalent conditions at the same time.
According to the scheme, the corresponding relation between the strength of the structural entity and the strength of the standard curing test piece can be accurately reflected according to the cement hydration process mechanism and the concrete structural entity curing condition, and the equivalent condition and the equivalent age of the structural entity and the standard curing test piece are determined.
And respectively obtaining the equivalent conditions in spring and autumn, summer and winter, and confirming the accumulated temperature and the accumulated humidity requirement of the structural entity maintenance by using the corresponding equivalent conditions in the corresponding seasons. The same intensity value corresponds to countless different temperature and humidity points in the three-dimensional space, so that corresponding equivalent age can be found under the condition that the temperature and humidity of each season and each region are different. The humidity of each place is different in the whole country, the humidity of different seasons is also different, and the concrete strength is different when the temperature is accumulated to 600 ℃. So that the intensity is equivalent if the simply accumulated temperature reaches the standard curing temperature. And the equivalent conditions of each season are obtained respectively, so that the method has more accurate guiding value.
As a result of one implementation, the following curves were obtained by experiment: fig. 1 shows a curve in a standard curing state, fig. 2 shows a curve of equivalent ages in spring and autumn in a capital region, fig. 3 shows a curve of equivalent ages in summer in a capital region, and fig. 4 shows a curve of equivalent ages in winter in a capital region.
Thus, for winter construction in the adult region, when the structural entity needs to be maintained to the strength of 45MPa, the temperature accumulated value corresponding to the point of 44.9MPa is 640 ℃, and the corresponding humidity is 2688RH; thus, the curing age at which the temperature integrated value reaches 640℃and the humidity integrated value reaches 2688RH is used as a standard for achieving the required strength of 45MPa in the solid curing.
The different seasons and the intensity requirements are obtained by taking points on the corresponding seasonal curves, and are not described in detail herein.
The above description is only of the preferred embodiments of the present invention and is not intended to limit the present invention, but various modifications and variations can be made to the present invention by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. The method for determining the strength curing age of the concrete of the structural entity is characterized by comprising the following steps of:
preparing a sufficient number of test pieces;
placing N groups of test pieces into a standard curing room for curing, wherein N is an integer more than 1, and naturally curing the rest test pieces in an open field;
recording the temperature and the humidity of natural maintenance every day, and respectively calculating the data value of the temperature and the accumulated value of the humidity;
when the curing age is 28 days, respectively taking N groups of standard curing test pieces and N groups of natural curing test pieces for compression tests, and recording the strength measured by the tests; comparing the difference between the average intensity value of the N groups of standard maintenance test pieces and the average intensity value of the N groups of natural maintenance test pieces;
after 28 days of age, taking N groups of natural curing test pieces for compression test every day, and comparing the measured average value of the intensities of the N groups of natural curing test pieces with the average value of the intensities of the standard curing test pieces measured in 28 days; marking points determined by the accumulated temperature and the accumulated humidity of each day and the average value of the strength of the natural curing test piece measured on the same day in a three-dimensional coordinate system;
when the difference value between the average value of the natural curing test piece strength and the average value of the standard curing test piece strength is within the allowable error range, judging that the natural curing test piece strength is equivalent to the standard curing test piece strength, and taking the accumulated temperature value and humidity value as the equivalent condition of the structural entity strength and the standard curing test piece strength;
when the method is applied, the accumulated temperature and the accumulated humidity of the maintenance of the structural entity are required to meet the requirement of equivalent conditions at the same time.
2. The method for determining the strength and curing age of the concrete of the structural entity according to claim 1, wherein the method comprises the following steps:
and respectively obtaining the equivalent conditions in spring and autumn, summer and winter, and confirming the accumulated temperature and the accumulated humidity requirement of the structural entity maintenance by using the corresponding equivalent conditions in the corresponding seasons.
3. The method for determining the strength and curing age of the concrete of the structural entity according to claim 1, wherein the method comprises the following steps:
n takes a value of 5-10.
4. A method for determining the strength and curing age of a structural solid concrete according to claim 3, wherein:
n takes a value of 5.
5. The method for determining the strength and curing age of the concrete of the structural entity according to claim 1, wherein the method comprises the following steps:
and connecting points determined by the accumulated temperature, the accumulated humidity and the average value of the strength of the natural maintenance test piece measured on the same day into fold lines or fitting the fold lines and the average value into spline curves.
6. The method for determining the strength and curing age of the concrete of the structural entity according to claim 5, wherein the method comprises the following steps of:
the three-dimensional coordinate system is a space rectangular coordinate system, wherein two coordinate axes of the bottom surface are respectively a temperature accumulated value coordinate and a humidity accumulated value coordinate, and the vertical coordinate is an intensity value coordinate.
7. The method for determining the strength and curing age of the concrete of the structural entity according to claim 1, wherein the method comprises the following steps:
the test pieces are 1000 groups in total and are manufactured by pouring after mixing and stirring medium sand, broken stone, cement, polycarboxylic acid additive and fly ash.
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