CN111599419B - Method for rapidly predicting actual strength of single-doped fly ash lightweight aggregate concrete - Google Patents
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Abstract
The invention belongs to the technical field of concrete, and particularly relates to a method for quickly predicting actual strength of single-doped fly ash lightweight aggregate concrete, aiming at providing a simple and effective means for evaluating the strength of the single-doped fly ash lightweight aggregate concrete. The method takes the fly ash mixing amount, the water-cement ratio, the cement strength and the maturity as independent variables, establishes an explicit strength calculation model for rapidly predicting the compressive strength of the single-doped fly ash lightweight aggregate concrete, and provides a simple and effective means for evaluating the strength of the single-doped fly ash lightweight aggregate concrete. The method can be used for rapidly predicting the strength of the singly-doped fly ash lightweight aggregate concrete directly according to the maturity, 28d compressive strength given in a cement delivery report, the fly ash mixing amount in the mixing proportion and the water-cement ratio. And the method provides guarantee for strength prediction of the single-doped fly ash lightweight aggregate concrete member under the condition of inconvenient field construction, and simultaneously provides convenience for field construction personnel.
Description
Technical Field
The invention belongs to the technical field of concrete, and particularly relates to a method for quickly predicting actual strength of a single-doped fly ash lightweight aggregate concrete.
Background
Under the background that the demand of cement and concrete is continuously increased, the energy consumption and pollution in the material firing process are reduced, the utilization of solid wastes is increased, and meanwhile, other auxiliary materials are effectively used, so that the performance of the material is improved, the service life is prolonged, the potential performance of the material is developed, and the use of a novel environment-friendly material is a future development trend. The traditional concrete has the defects of great self weight, easy cracking, high manufacturing cost, high energy consumption and the like.
A novel concrete material is developed, namely the lightweight aggregate concrete is a concrete material formed by mixing lightweight aggregate instead of natural sandstone aggregate, has the characteristics of light weight, good heat insulation performance and high impermeability, and is widely applied to the engineering fields of civil high-rise buildings, large-frame bridges and the like.
In addition, dust generated during the production of cement is an important pollutant which causes environmental damage, and many researchers have made efforts to research mineral admixtures, which are substitutes for cement, in order to reduce the environmental burden caused during the production and use of cement. The mineral admixture taking the industrial waste residue or the natural mineral material as the raw material can fill the pores of the cementing material, participate in the hydration of the cementing material, improve the interface structure of the concrete and improve the strength and the durability of the concrete. The fly ash (fly ash) is used as a waste material of a thermoelectric factory, and the mixing of the fly ash (fly ash) can not only ensure the quality of concrete and reduce the cost for manufacturing the concrete, but also improve the workability, durability and later strength of the concrete, thereby becoming the most widely used substitute for countries in the world. However, the large amount of the fly ash can have a remarkable influence on the development of the concrete strength. The concrete strength is the core for guaranteeing the construction quality of the concrete, is an important basis for structural design and construction, and is also an important technical performance index of the concrete. Therefore, an explicit expression calculation model of the strength of the fly ash concrete needs to be established.
The strength of concrete is influenced by various factors, but when the mixing proportion and the construction process are determined, the curing temperature and the age become key factors influencing the strength increase of the concrete. The method for predicting the strength evolution state of the concrete structure by using the maturity method is a feasible real-time in-situ nondestructive testing technology. The maturity method is a technology which comprehensively considers the influence of time and temperature on the development of the concrete strength, and provides a relatively simple evaluation means for the real-time evaluation of the concrete structure strength.
At present, scholars at home and abroad successfully establish different types of concrete compressive strength calculation models based on maturity, however, researches on lightweight aggregate concrete are not many, and the functions of fly ash mixing amount, water-cement ratio and cement strength are not considered in the models.
Therefore, how to establish a relational expression between the maturity and the compressive strength of the fly ash lightweight aggregate concrete and provide a simple and effective means for evaluating the structural strength of the fly ash lightweight aggregate concrete is a technical problem to be solved by those skilled in the art.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information is prior art that is known to a person skilled in the art.
Disclosure of Invention
The invention provides a method for rapidly predicting actual strength of single-doped fly ash lightweight aggregate concrete, which establishes an explicit strength calculation model for rapidly predicting compressive strength of the single-doped fly ash lightweight aggregate concrete by taking fly ash doping amount, water-cement ratio, cement strength and maturity as independent variables, and provides a simple and effective means for evaluating the strength of the single-doped fly ash lightweight aggregate concrete.
In order to solve the technical problems, the invention comprises the following technical scheme:
s1, preparing a plurality of test blocks of the single-doped fly ash lightweight aggregate concrete with different doping amounts, placing the test blocks in groups at different curing temperatures for curing, testing the compressive strength at different ages, and providing a data basis for subsequently establishing a rapid testing formula for predicting the strength of the single-doped fly ash lightweight aggregate concrete;
s2, arranging a temperature sensor in the concrete test block with the single fly ash-doped lightweight aggregate, and uploading temperature data acquired by the temperature sensor to a processor; and (3) calculating the maturity value of the fly ash lightweight aggregate concrete in each age according to the data of each age and the maintenance temperature data by substituting into a formula (1):
M=∑(T-T 0)·Δt(1)
in the formula:Mmaturity in degrees, unit DEG C·d；TIs a time interval deltatTemperature in concrete, unit ℃;T 0the reference temperature is the temperature at which the concrete strength does not increase with the age, namely the temperature at which the hydration reaction in the concrete stops, and is usually-10 ℃; deltatIs a time interval, unitd；
Step S3, performing fitting analysis on the test strength data obtained in the step S1 and the maturity information obtained in the step S2, and establishing a strength development curve of the single-doped fly ash lightweight aggregate concrete according to a strength relational expression of the single-doped fly ash lightweight aggregate concrete obtained through the fitting analysis by using the acquired temperature, the known concrete mixing ratio and the material information, which is shown in a formula (2);
f t =0.2632f ce ·M·(0.0906R FA 2+0.0253R FA +0.9995)·(1/R W/B -0.304)·(-0.797R FA 2-0.359R FA +1.426)/(0.9012M+76.3) (2)
in the formula:f ce the cement is 28d compressive strength given in a cement factory report, and the unit is MPa;Mthe unit is the maturity of the fly ash lightweight aggregate concrete, and the unit is DEG C.d;R FA the blending amount of the fly ash is taken as the blending amount of the fly ash;R W/B the water-to-glue ratio is adopted;
step S4, when the concrete test block is prepared in a laboratory, obtaining the water-cement ratio, the fly ash mixing amount and 28d compressive strength information given in a cement delivery report according to the temperature data transmitted by the temperature sensor, the determined mixing ratio of the single-doped fly ash lightweight aggregate concrete and the used material information, and rapidly predicting the strength of the single-doped fly ash lightweight aggregate concrete in real time;
s5, when the concrete test block is a construction site sample, if the strength of the concrete structure at any moment is to be predicted, the rapid prediction can be carried out according to the relational expression (2) in the S3; if the minimum strength value required by form removal is known, obtaining the water-cement ratio, the fly ash mixing amount, the cement delivery strength and the historical daily average temperature record of the field environment according to the determined mixing ratio of the single-doped fly ash lightweight aggregate concrete and the used material information, and substituting the minimum strength required by form removal of the concrete member into a formula (2) for inverse calculation to obtain the maturity; and finally, substituting the temperature data and the maturity data obtained by inverse calculation into a formula (1), and obtaining the member form removal time through inverse estimation, wherein the time is the predicted on-site concrete form removal time.
Compared with the prior art, the invention has the following advantages and beneficial effects:
the invention provides a method for rapidly predicting actual strength of single-doped fly ash lightweight aggregate concrete, which establishes an explicit rapid prediction and establishment strength calculation model of compressive strength of the single-doped fly ash lightweight aggregate concrete by taking fly ash doping amount, water-cement ratio, cement strength and maturity as independent variables. And the method provides guarantee for strength prediction of the single-doped fly ash lightweight aggregate concrete member under the condition of inconvenient field construction, and simultaneously provides convenience for field construction personnel.
Further, the distance between the temperature sensor and the center of the concrete test block is smaller than or equal to 15mm, and the temperature sensor is fully contacted with the concrete test block.
Further, in the step S3, the predicted concrete block strength is 150m3And (5) the strength of the concrete test piece.
Further, the maturity in the step S3 is calculated according to the age and the curing temperature by the formula (1).
Further, the maturity of the test piece on the construction site in the step S3 may also be measured directly by using a concrete maturity meter.
Drawings
FIG. 1 is a schematic flow chart of a method for rapidly predicting actual strength of a single-doped fly ash lightweight aggregate concrete in one embodiment of the invention;
FIG. 2 is a diagram illustrating the blending ratio of the single-blended fly ash lightweight aggregate concrete in the method for rapidly predicting the actual strength of the single-blended fly ash lightweight aggregate concrete in one embodiment of the present invention;
FIG. 3 is a graph showing the comparison between the actual compressive strength and the predicted compressive strength of fly ash lightweight aggregate concrete of different mix ratios and different ages in the method for rapidly predicting the actual strength of a single-doped fly ash lightweight aggregate concrete in one embodiment of the present invention.
Detailed Description
The method for rapidly predicting the actual strength of the single-doped fly ash lightweight aggregate concrete provided by the invention is further described in detail by combining the attached drawings and specific examples. The advantages and features of the present invention will become more apparent from the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention. For convenience of description, the directions of "up" and "down" described below are the same as the directions of "up" and "down" in the drawings, but this is not a limitation of the technical solution of the present invention.
Example one
The method for rapidly predicting the actual strength of the single-doped fly ash lightweight aggregate concrete of the invention is described in detail below with reference to fig. 1 to 3.
Referring to fig. 1 to 3, a method for rapidly predicting actual strength of a single-doped fly ash lightweight aggregate concrete includes:
step S1, preparing a plurality of concrete test blocks with different doping amounts and single-doped fly ash lightweight aggregate according to GB50081-2002 of common concrete mechanical property test methods, wherein the concrete test blocks are 150mm cubic test blocks, 4 blocks in each group are grouped, and the concrete test blocks are placed at different curing temperatures for curing and tested for compressive strength at different ages;
and step S2, arranging 1 temperature sensor in the single fly ash-doped lightweight aggregate concrete test block, and uploading the acquired temperature data to a processor. And (3) calculating the maturity value of the fly ash lightweight aggregate concrete in each age according to the data of each age and the maintenance temperature data by substituting into a formula (1):
M=∑(T-T 0)·Δt(1)
in the formula:Mmaturity in degrees, unit DEG C·d；TIs a time interval deltatTemperature in concrete, unit ℃;T 0the reference temperature is the temperature at which the concrete strength does not increase with the age, namely the temperature at which the hydration reaction in the concrete stops, and is usually-10 ℃; deltatIs a time interval, unitd；
Step S3, fitting and analyzing the test strength data obtained in the step S1 and the maturity information obtained in the step S2, and establishing the strength of the single-doped fly ash lightweight aggregate concrete for rapid prediction according to a strength relational expression of the single-doped fly ash lightweight aggregate concrete obtained through fitting and analysis by using the acquired temperature, the known concrete mixing ratio and the material information, which is shown in a formula (2);
f t =0.2632f ce ·M·(0.0906R FA 2+0.0253R FA +0.9995)·(1/R W/B -0.304)·(-0.797R FA 2-0.359R FA +1.426)/(0.9012M+76.3) (2)
in the formula:f ce the unit is the cement strength in MPa;Mthe unit is the maturity of the fly ash lightweight aggregate concrete, and the unit is DEG C.d;R FA the blending amount of the fly ash is taken as the blending amount of the fly ash;R W/B the water-to-glue ratio is adopted;
step S4, when the concrete test block is a test block prepared in a laboratory, according to the temperature data transmitted by the temperature sensor, the determined mixing proportion of the single-doped fly ash lightweight aggregate concrete and the used material information, the information such as the water-cement ratio, the fly ash mixing amount, the cement delivery strength and the like can be obtained, and the strength development curve of the single-doped fly ash lightweight aggregate concrete can be monitored;
step S5, when the concrete test block is a construction site sample, if the strength of the concrete structure at any time is to be predicted, the rapid prediction can be carried out according to the relation (2) in the step S3; if the minimum strength value required by form removal is known, obtaining information such as water-cement ratio, fly ash mixing amount, cement delivery strength and the like and historical daily average temperature record of a field environment according to the determined mixing ratio of the single-doped fly ash lightweight aggregate concrete and the used material information, and substituting the minimum strength required by form removal of the concrete member into a formula (2) for reverse calculation to obtain maturity; and finally substituting the temperature data and the maturity data obtained by back calculation into a formula (1) to obtain the member form removal time which is the predicted on-site concrete form removal time.
Specifically, the strength relationship of the concrete with the single-doped fly ash lightweight aggregate, namely the derivation process of the formula (2), is as follows:
I) dividing the strength of the single-doped fly ash lightweight aggregate concrete obtained in the test by the corresponding 28d strength to obtain the relative strength (f r ）；
II) fitting the relation between the relative strength and the maturity by adopting a hyperbolic relation formula according to a relative compression strength-maturity curve of the lightweight aggregate concrete with zero fly ash content, which is obtained by the test, as a reference formula to obtain a formula (3):
f r,0=f t0,/f 0,28=M 0/(0.9012M 0+76.3) (3)
in the formula:f r,0is the relative pressure intensity of lightweight aggregate concrete with zero fly ash contentDegree;f t0,the age of the lightweight aggregate concrete with zero fly ash content istCompressive strength in MPa;f 0,28the concrete is lightweight aggregate concrete with zero fly ash content and 28d compressive strength, unit MPa;M 0the lightweight aggregate concrete with zero fly ash content has the unit of DEG C d;
III) fitting the relation between the relative strength and the maturity of the lightweight aggregate concrete with different blending amounts of the fly ash obtained by the test by taking the relative compressive strength-maturity curve of the lightweight aggregate concrete with zero blending amount of the fly ash obtained by the test as a reference formula to obtain a formula (4):
f r =f t /f 28=α·M/(0.9012M+76.3) (4)
in the formula:f r the relative compressive strength of the fly ash lightweight aggregate concrete is shown;f t the age of the fly ash lightweight aggregate concrete istCompressive strength in MPa;f 28the compression strength of the fly ash lightweight aggregate concrete is 28d, and the unit is MPa;Mthe unit is the maturity unit of coal ash lightweight aggregate concrete, namely ℃. d;αis an empirical parameter related to the mixing amount of the fly ash;
IV) fitting the data of the strength and the maturity of the concrete with the different fly ash lightweight aggregates in the data obtained by the test according to a formula (4) respectively to obtain different typesαA value;
v) obtainedαValue and fly ash mixing amountR FA Fitting is carried out to obtainαMixing with fly ashR FA The relationship between, i.e., equation (5):
α=0.0906R FA 2+0.0253R FA +0.9995 (5)；
VI) water-to-glue ratioR W/B Mixing amount of fly ashR FA And cement strengthf ce For reference factors, a 28d fly ash lightweight aggregate concrete strength formula is established, namelyFormula (6):
f 28=0.2632f ce ·(1/R W/B -0.304)·(-0.797R FA 2-0.359R FA +1.426) (6)；
VII) simultaneously establishing a formula (4), a formula (5) and a formula (6) to obtain the relation between the strength and the maturity of the fly ash lightweight aggregate concrete, namely the formula (2).
In particular, the strength prediction formula of the single-doped fly ash lightweight aggregate concrete in the step S3 can monitor the strength development of the fly ash lightweight aggregate concrete in real time.
In particular, in step S3R W/B AndR FA as the independent variable, there is a variable,f 28/f ce the formula (2) is obtained for the dependent variable fitting.
Specifically, the embodiment provides a method for rapidly predicting actual strength of a single-doped fly ash lightweight aggregate concrete, and an explicit rapid prediction model for building compressive strength of the single-doped fly ash lightweight aggregate concrete is built by taking fly ash doping amount, water-cement ratio, cement strength and maturity as independent variables, so that a simple and effective means for evaluating the strength of the single-doped fly ash lightweight aggregate concrete is provided. The method can be used for rapidly predicting the strength of the singly-doped fly ash lightweight aggregate concrete directly according to the maturity, the strength given in a cement delivery report, the fly ash mixing amount in the mixing proportion and the water-cement ratio. And the method provides guarantee for strength prediction of the single-doped fly ash lightweight aggregate concrete member under the condition of inconvenient field construction, and simultaneously provides convenience for field construction personnel.
Particularly, the strength prediction formula of the single-doped fly ash lightweight aggregate concrete in the step S3 can be used for rapidly predicting the strength of the single-doped fly ash lightweight aggregate concrete with the mixture ratio only by temperature, fly ash mixing amount, water-cement ratio, cement delivery strength and the like. The method can be applied to predicting the on-site concrete form removal time under various working conditions.
Example two
With continued reference to fig. 1 to 3, according to the formula provided in the first embodiment, the standard mix ratio of lightweight aggregate concrete with strength LC50 and the mix ratio of fly ash lightweight aggregate concrete with cement replacement rate of 0-50% are designed according to the technical specification of lightweight aggregate concrete (JGJ 51-2002), as shown in fig. 1. And preparing a standard three-dimensional test piece of 150mm multiplied by 150mm according to the relevant requirements of standard of common concrete mechanical property empirical method (GB/T50081-2002) and curing the test piece to 7 days and 28 days for carrying out a compressive strength test. Wherein the 28d compressive strength in the cement factory index is 42.9 MPa.
And substituting the age and the curing temperature of the strength to be predicted into a formula (1) to obtain the maturity of the fly ash lightweight aggregate concrete at different ages, and substituting the water-cement ratio, the fly ash mixing amount, the cement leaving 28d compressive strength and other data of the mixing ratio given in the formula (1) and the maturity value obtained by calculation of the formula (1) into a formula (2) to obtain the predicted compressive strength value. The ratio of the actual compressive strength to the predicted compressive strength of the fly ash lightweight aggregate concrete with different proportions and different ages is shown in figure 3.
As can be seen from FIG. 3, the present invention can better predict the compressive strength of the lightweight aggregate concrete with single fly ash in different ages, and the prediction error percentage is within about 10%.
The above examples are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments. The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (5)
1. A method for rapidly predicting actual strength of a single-doped fly ash lightweight aggregate concrete is characterized by comprising the following steps:
s1, preparing a plurality of test blocks of the single-doped fly ash lightweight aggregate concrete with different doping amounts, placing the test blocks in groups at different curing temperatures for curing, testing the compressive strength at different ages, and providing a data basis for subsequently establishing a rapid testing formula for predicting the strength of the single-doped fly ash lightweight aggregate concrete;
s2, arranging a temperature sensor in the concrete test block with the single fly ash-doped lightweight aggregate, and uploading temperature data acquired by the temperature sensor to a processor; and (3) calculating the maturity value of the fly ash lightweight aggregate concrete in each age according to the data of each age and the maintenance temperature data by substituting into a formula (1):
M=∑(T-T 0)·Δt(1)
in the formula:Mmaturity in degrees, unit DEG C·d；TIs a time interval deltatTemperature in concrete, unit ℃;T 0the reference temperature is the temperature at which the concrete strength does not increase with the age, namely the temperature at which the hydration reaction in the concrete stops, and is taken as-10 ℃; deltatIs a time interval, unitd；
Step S3, performing fitting analysis on the test strength data obtained in the step S1 and the maturity information obtained in the step S2, and establishing a strength development curve of the single-doped fly ash lightweight aggregate concrete according to a strength relational expression of the single-doped fly ash lightweight aggregate concrete obtained through the fitting analysis by using the acquired temperature, the known concrete mixing ratio and the material information, which is shown in a formula (2);
f t =0.2632f ce ·M·(0.0906R FA 2+0.0253R FA +0.9995)·(1/R W/B -0.304)·(-0.797R FA 2-0.359R FA +1.426)/(0.9012M+76.3) (2)
in the formula:f ce the cement is 28d compressive strength given in a cement factory report, and the unit is MPa;Mthe unit is the maturity of the fly ash lightweight aggregate concrete, and the unit is DEG C.d;R FA the blending amount of the fly ash is taken as the blending amount of the fly ash;R W/B the water-to-glue ratio is adopted;
step S4, when the concrete test block is prepared in a laboratory, obtaining the water-cement ratio, the fly ash mixing amount and 28d compressive strength information given in a cement delivery report according to the temperature data transmitted by the temperature sensor, the determined mixing ratio of the single-doped fly ash lightweight aggregate concrete and the used material information, and rapidly predicting the strength of the single-doped fly ash lightweight aggregate concrete in real time;
step S5, when the concrete test block is a construction site sample, if the strength of the concrete structure at any time is to be predicted, the rapid prediction can be carried out according to the formula (2) in the step S3; if the minimum strength value required by form removal is known, obtaining the water-cement ratio, the fly ash mixing amount, the 28d compressive strength given in a cement delivery report and the historical daily average temperature record of the field environment according to the determined mixing ratio of the single-doped fly ash lightweight aggregate concrete and the used material information, and substituting the minimum strength required by form removal of the concrete member into a formula (2) for carrying out inverse calculation to obtain the maturity; and finally, substituting the temperature data and the maturity data obtained by inverse calculation into a formula (1), and obtaining the member form removal time through inverse estimation, wherein the time is the predicted on-site concrete form removal time.
2. The method for rapidly predicting the actual strength of the concrete with the single-doped fly ash lightweight aggregate according to claim 1, wherein the distance between the temperature sensor and the center of the concrete test block is less than or equal to 15mm, and the temperature sensor is in full contact with the concrete test block.
3. The method for rapidly predicting the actual strength of the single-doped fly ash lightweight aggregate concrete according to claim 1, wherein in the step S3, the predicted concrete test block strength is 150m3And (5) the strength of the concrete test piece.
4. The method for rapidly predicting the actual strength of a single-blended fly ash lightweight aggregate concrete according to claim 1, wherein the degree of ripeness in the step S3 is calculated according to the age and the curing temperature by the formula (1).
5. The method for rapidly predicting the actual strength of the single-doped fly ash lightweight aggregate concrete according to claim 1, wherein the maturity in the step S3 is directly measured by a concrete maturity tester.
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