CN112649511A - Detection method for construction quality of rock-fill concrete - Google Patents
Detection method for construction quality of rock-fill concrete Download PDFInfo
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- CN112649511A CN112649511A CN202011352485.2A CN202011352485A CN112649511A CN 112649511 A CN112649511 A CN 112649511A CN 202011352485 A CN202011352485 A CN 202011352485A CN 112649511 A CN112649511 A CN 112649511A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N29/00—Investigating or analysing materials by the use of ultrasonic, sonic or infrasonic waves; Visualisation of the interior of objects by transmitting ultrasonic or sonic waves through the object
- G01N29/04—Analysing solids
- G01N29/07—Analysing solids by measuring propagation velocity or propagation time of acoustic waves
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/01—Indexing codes associated with the measuring variable
- G01N2291/011—Velocity or travel time
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/023—Solids
- G01N2291/0232—Glass, ceramics, concrete or stone
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/02—Indexing codes associated with the analysed material
- G01N2291/028—Material parameters
- G01N2291/02818—Density, viscosity
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N2291/00—Indexing codes associated with group G01N29/00
- G01N2291/04—Wave modes and trajectories
- G01N2291/042—Wave modes
- G01N2291/0421—Longitudinal waves
Abstract
The invention relates to a detection method for construction quality of rock-fill concrete, which comprises the following steps: the method comprises the following steps: pouring SCC accompanying test blocks with different sizes and different mix proportions, and acquiring the longitudinal wave velocity of each SCC accompanying test block; step two: predicting the longitudinal wave velocity of an SCC structure with the same transmission distance as the RFC structure; step three: acquiring the elastic modulus of an SCC structure with the same transmission distance as the RFC structure; step four: carrying out ultrasonic detection on an RFC structure to be detected to obtain the longitudinal wave velocity of the RFC structure; step five: acquiring a change curve of relaxation time of an SCC structure and an RFC structure along with the age; step six: and establishing a judgment standard of the RFC construction quality. The invention solves the problem that the RFC representative unit volume is too large to carry out loading test, and when the viscous characteristic parameter of the application material is used for evaluating the RFC pouring quality, less measuring lines can be adopted to complete ultrasonic detection.
Description
Technical Field
The invention relates to a concrete construction quality detection method, in particular to a detection method of rockfill concrete construction quality, and belongs to the technical field of structural engineering.
Background
As is known, concrete is a viscoelastic medium, and the propagation of ultrasonic waves inside concrete is related not only to the elastic characteristics of the concrete material, but also to the viscous characteristics of the concrete material. In the early age stage of the concrete, the viscosity characteristic of the material is obvious, so that the ultrasonic test is carried out in the early age stage of the concrete, the development rule of the viscosity characteristic parameter of the material is analyzed, and the deep understanding of the pouring state of the concrete is facilitated. For Rock-Filled Concrete (RFC), compared to Self-filling Concrete (SCC) for placement, the viscosity characteristics of individual Rock-Filled Concrete are considered negligible, whereas the viscosity characteristics of SCC for placement directly determine the compaction of RFC.
At present, an ultrasonic detection method is generally adopted for RFC construction quality, but due to the nonuniformity of RFC, when analysis and judgment are carried out only by means of a wave velocity mean value and a variation coefficient, high-density layered measuring lines need to be arranged in a Representative unit Volume (REV) of the RFC, measuring points are relatively complicated to arrange in the actual construction quality detection process, the implementation difficulty in actual engineering is large, and the time cost and the cost are high.
Disclosure of Invention
In view of the above problems, an object of the present invention is to provide a method for detecting the construction quality of rock-fill concrete, which can extract a viscosity characteristic parameter from an ultrasonic velocity measurement value to determine the rock-fill concrete casting quality.
In order to achieve the purpose, the invention adopts the following technical scheme: a detection method for construction quality of rock-fill concrete comprises the following steps:
the method comprises the following steps: pouring self-filling concrete accompanying test blocks with different sizes and different mixing ratios, and obtaining the longitudinal wave velocity of each self-filling concrete accompanying test block;
step two: predicting the longitudinal wave velocity of a self-filling concrete structure with the same transmission distance as the rockfill concrete structure;
step three: acquiring the elastic modulus of a self-filling concrete structure with the same transmission distance as the rockfill concrete structure;
step four: carrying out ultrasonic detection on the rockfill concrete structure to be detected to obtain the longitudinal wave velocity of the rockfill concrete structure;
step five: acquiring curves of the relaxation time of a self-filling concrete structure and a rockfill concrete structure along with the change of the age;
step six: and establishing a judgment standard of the construction quality of the rock-fill concrete.
The detection method preferably comprises the step of carrying out ultrasonic testing on each self-filling concrete accompanying test block at different ages by a positive projection method to obtain the longitudinal wave velocity of the self-filling concrete accompanying test block in the step I.
Preferably, in the second step, the age is used as an abscissa and the longitudinal wave velocity is used as an ordinate, and the trend of the longitudinal wave velocity of the self-filled concrete with different sizes along with the age is established so as to predict the longitudinal wave velocity of the self-filled concrete structure with the same transmission distance as the rockfill concrete structure.
Preferably, in the third step, the self-filling concrete accompanying test block is subjected to a basic mechanical property experiment, and the result is fitted to obtain the elastic modulus E of the self-filling concrete structure with the same transmission distance as the rockfill concrete structuresccThe formula developed with age is as follows:
in the formula, E0Represents the final elastic modulus of the material; θ represents the age of SCC accompanying test piece; s represents a constant.
The detection method preferably arranges a measuring line only at the center of the rockfill concrete structure and detects the measuring line by transmission ultrasound to acquire the longitudinal wave velocity of the rockfill concrete structure when the step four is carried out.
Preferably, the detection method comprises the following specific steps when the step five is performed:
1) for the rockfill concrete structure, assuming that the volume ratio of the rockfill before casting is alpha and the rockfill is an ideal elastomer, then:
in the formula, ρrfcAnd erfcRespectively representing the average density and the average elastic modulus of the rockfill concrete structure; rhorkAnd erkRespectively representing the average density and the average elastic modulus of the rockfill in the rockfill concrete structure, wherein the average density and the average elastic modulus can be obtained through an elastic wave test; rhosccAnd esccRespectively representing the density and the elastic modulus of a self-filled concrete structure with the same transmission distance with the rockfill concrete structure;
2) substituting the formula (1) into the formula (2) to obtain the average density rho of the rockfill concrete structurerfcAnd mean elastic modulus Erfc；
3) According to the longitudinal wave velocity of the SCC structure with the same transmission distance as the RFC structure predicted in the step two, the relaxation time of the SCC structure with the same transmission distance as the RFC structure can be obtained through the formulas (3) and (4):
wherein q represents an intermediate variable; v represents the poisson's ratio;
in the formula, vp_scc、Escc、ρsccAnd τsccRespectively representing the longitudinal wave velocity, the elastic modulus, the density and the relaxation time of the SCC structure with the same transmission distance as the RFC structure; ω represents the circular frequency of the ultrasonic wave;
4) according to the longitudinal wave velocity of the RFC structure obtained by ultrasonic detection in the step four, the relaxation time of the RFC structure can be obtained through the formulas (3) and (5):
in the formula, vp_rfc、Erfc、ρrfcAnd τrfcRespectively representing the longitudinal wave velocity, the average elastic modulus, the average density and the relaxation time of the RFC structure; ω represents the circular frequency of the ultrasonic wave.
The detection method preferably includes the following steps: and when the relative difference between the relaxation time of the rockfill concrete structure and the relaxation time of the self-filled concrete structure is within 5 percent, the construction quality of the rockfill concrete structure is considered to be better.
Due to the adoption of the technical scheme, the invention has the following advantages: the method is based on the viscoelastic medium fluctuation theory, the SCC is taken as the basis along with the test block performance, the material mechanical property of the RFC is estimated, and the problem that the loading test is difficult due to overlarge RFC representative unit volume is solved; meanwhile, when the viscous characteristic parameters of the material are used for evaluating the RFC pouring quality, fewer measuring lines can be adopted to complete ultrasonic detection. Therefore, in engineering practice, extracting viscosity characteristic parameters from ultrasonic speed measurement values to judge the concrete pouring quality is a method with wide application prospect.
Drawings
FIG. 1 is a schematic flow diagram of the present invention;
FIG. 2 is a schematic diagram of RFC structural ultrasound detection of the present invention;
fig. 3 is a graph of relaxation time versus age trends for SCC and RFC structures.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the method for detecting the construction quality of the rock-fill concrete provided by the invention comprises the following steps:
the method comprises the following steps: firstly, SCC accompanying test blocks with different sizes and different mixing ratios (mixing ratios are known) are poured, and then ultrasonic testing is carried out on the SCC accompanying test blocks with different ages by a positive transmission method, so as to obtain the longitudinal wave velocity of each SCC accompanying test block.
Step two: different mix proportions are known, the age is taken as an abscissa, the longitudinal wave velocity is taken as an ordinate, the change trend of the longitudinal wave velocity of the SCC with different sizes along with the test block along with the age is established, and the longitudinal wave velocity of the SCC structure with the same transmission distance as that of the RFC structure is predicted.
Step three: carrying out basic mechanical property experiment on the SCC accompanying test block, fitting the result to obtain the elastic modulus E of the SCC structure with the same transmission distance as the RFC structuresccThe formula developed with age is as follows:
in the formula, E0Represents the final elastic modulus of the material; θ represents the age of SCC accompanying test piece; s represents a constant.
Step four: ultrasonic detection is carried out on the RFC structure to be detected, and the longitudinal wave velocity of the RFC structure is acquired:
because the rockfill aggregate in the RFC structure has a 'deposition effect', the content of the rockfill at the top layer of the structure is less, the content of the rockfill at the bottom layer is more, the space distribution is uneven, and the detection result is not representative, a measuring line (shown in figure 2) can be arranged only at the middle elevation of the RFC structure, and the longitudinal wave velocity of the rockfill aggregate can be obtained by transmission ultrasonic detection.
Step five: acquiring a change curve of relaxation time of an SCC structure and an RFC structure along with the age, wherein the specific process is as follows:
1) for the RFC structure, assuming that the volume ratio of the rockfill before casting is alpha and the rockfill is an ideal elastomer, then:
in the formula, ρrfcAnd erfcRespectively expressing the average density and the average elastic modulus of the RFC structure; rhorkAnd erkRespectively representing the average density and the average elastic modulus of the rockfill in the RFC structure, and being obtained by an elastic wave test; rhosccAnd esccRespectively representing the density and the elastic modulus of an SCC structure having the same transmission distance as the RFC structure;
2) the average density ρ of the RFC structure can be obtained by substituting formula (1) into formula (2)rfcAnd mean elastic modulus Erfc；
3) According to the longitudinal wave velocity of the SCC structure with the same transmission distance as the RFC structure predicted in the step two, the viscosity characteristic parameter (i.e. relaxation time) of the SCC structure with the same transmission distance as the RFC structure can be obtained through the equations (3) and (4):
wherein q represents an intermediate variable; v represents the poisson ratio, which is 0.2 for both RFC structure and SCC structure in this embodiment;
in the formula, vpscc、Escc、ρsccAnd τsccRespectively representing the longitudinal wave velocity, the elastic modulus, the density and the relaxation time of the SCC structure with the same transmission distance as the RFC structure; ω represents the circular frequency of the ultrasonic wave;
4) according to the longitudinal wave velocity of the RFC structure obtained by ultrasonic detection in the fourth step, the viscosity characteristic parameter (namely relaxation time) of the RFC structure can be obtained through the formulas (3) and (5):
in the formula, vp_rfc、Erfc、ρrfcAnd τrfcRespectively representing the longitudinal wave velocity, the average elastic modulus, the average density and the relaxation time of the RFC structure; ω represents the circular frequency of the ultrasonic wave.
Step six: establishing a judgment standard of RFC construction quality:
because the relaxation time of SCC structure and RFC structure increases and reduces along with age to tend to stable, the relaxation time of SCC structure is close to the RFC structure gradually (as shown in fig. 3), consequently can judge the construction quality of RFC structure with the relaxation time of RFC structure, specifically be: when the relative difference between the relaxation time of the RFC structure and the relaxation time of the SCC structure is within 5%, the construction quality of the RFC structure is considered to be good.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (7)
1. A detection method for construction quality of rock-fill concrete is characterized by comprising the following steps:
the method comprises the following steps: pouring self-filling concrete accompanying test blocks with different sizes and different mixing ratios, and obtaining the longitudinal wave velocity of each self-filling concrete accompanying test block;
step two: predicting the longitudinal wave velocity of a self-filling concrete structure with the same transmission distance as the rockfill concrete structure;
step three: acquiring the elastic modulus of a self-filling concrete structure with the same transmission distance as the rockfill concrete structure;
step four: carrying out ultrasonic detection on the rockfill concrete structure to be detected to obtain the longitudinal wave velocity of the rockfill concrete structure;
step five: acquiring curves of the relaxation time of a self-filling concrete structure and a rockfill concrete structure along with the change of the age;
step six: and establishing a judgment standard of the construction quality of the rock-fill concrete.
2. The method as claimed in claim 1, wherein in the step of performing, each self-filling concrete accompanying test block is subjected to ultrasonic testing at different ages by a positive projection method to obtain the longitudinal wave velocity thereof.
3. The method according to claim 2, wherein in the second step, the age is taken as an abscissa and the longitudinal wave velocity is taken as an ordinate, and the trend of the longitudinal wave velocity of the self-filled concrete with different sizes along with the test block along with the age is established to predict the longitudinal wave velocity of the self-filled concrete structure having the same transmission distance as the rockfill concrete structure.
4. The detection method according to claim 3, wherein in the third step, the self-filling concrete accompanying test block is subjected to a basic mechanical property test, and the result is fitted to obtain the elastic modulus E of the self-filling concrete structure having the same transmission distance as the rockfill concrete structuresccThe formula developed with age is as follows:
in the formula, E0Represents the final elastic modulus of the material; θ represents the age of SCC accompanying test piece; s represents a constant.
5. The inspection method according to claim 4, wherein in the fourth step, a survey line is arranged only at the center of the rockfill concrete structure and is inspected by transmission ultrasound to obtain the velocity of longitudinal waves thereof.
6. The detection method according to claim 5, wherein the specific process when performing the step five is as follows:
1) for the rockfill concrete structure, assuming that the volume ratio of the rockfill before casting is alpha and the rockfill is an ideal elastomer, then:
in the formula, ρrfcAnd erfcRespectively representing the average density and the average elastic modulus of the rockfill concrete structure; rhorkAnd erkThe average density and the average elastic modulus of the rockfill in the rockfill concrete structure can be obtained through an elastic wave test; rhosccAnd esccRespectively representing the density and the elastic modulus of a self-filled concrete structure with the same transmission distance with the rockfill concrete structure;
2) substituting the formula (1) into the formula (2) to obtain the average density rho of the rockfill concrete structurerfcAnd mean elastic modulus Erfc；
3) According to the longitudinal wave velocity of the SCC structure with the same transmission distance as the RFC structure predicted in the step two, the relaxation time of the SCC structure with the same transmission distance as the RFC structure can be obtained through the formulas (3) and (4):
wherein q represents an intermediate variable; v represents the poisson's ratio;
in the formula, vp_scc、Escc、ρsccAnd τsccRespectively representing the longitudinal wave velocity, the elastic modulus, the density and the relaxation time of the SCC structure with the same transmission distance as the RFC structure; ω represents the circular frequency of the ultrasonic wave;
4) according to the longitudinal wave velocity of the RFC structure obtained by ultrasonic detection in the step four, the relaxation time of the RFC structure can be obtained through the formulas (3) and (5):
in the formula, vp_rfc、Erfc、ρrfcAnd τrfcRespectively representing the longitudinal wave velocity, the average elastic modulus, the average density and the relaxation time of the RFC structure; ω represents the circular frequency of the ultrasonic wave.
7. The detection method according to claim 6, wherein the judgment criteria of the construction quality of the rock-fill concrete are specifically: and when the relative difference between the relaxation time of the rockfill concrete structure and the relaxation time of the self-filled concrete structure is within 5 percent, the construction quality of the rockfill concrete structure is considered to be better.
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