CN108387613B - Method for detecting influence degree of recycled aggregate on concrete interface transition region - Google Patents
Method for detecting influence degree of recycled aggregate on concrete interface transition region Download PDFInfo
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- CN108387613B CN108387613B CN201711471682.4A CN201711471682A CN108387613B CN 108387613 B CN108387613 B CN 108387613B CN 201711471682 A CN201711471682 A CN 201711471682A CN 108387613 B CN108387613 B CN 108387613B
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- G01N27/02—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating impedance
Abstract
The invention relates to a method for detecting the influence degree of recycled aggregate on a concrete interface transition zone, which comprises the steps of manufacturing a recycled aggregate finished product test block and an acrylic aggregate finished product test block with conductive properties; and performing AC impedance spectrum test on the two test blocks to obtain a complex plane diagram of electrochemical impedance, and performing least square fitting through an equivalent circuit to obtain R1、R1 *And R2、R2 *(ii) a Wherein R is1And R2Respectively is the minimum value and the maximum value of the real part in an impedance complex plane diagram of a typical recycled aggregate concrete test block, R1A and R2Respectively representing the minimum value and the maximum value of a real part in an impedance complex plane diagram of a typical acrylic concrete test block; by the formula
And calculating an influence factor, wherein the larger the influence factor is, the larger the influence of the recycled aggregate on the interface transition area is, and the smaller the influence factor is. Through the test, a relatively effective influence test result can be obtained, and the method can be widely applied to the influence test of the recycled aggregate on the concrete interface transition zone.
Description
Technical Field
The invention relates to a material performance detection method, in particular to a method for detecting the influence degree of recycled aggregate in recycled aggregate concrete on a concrete interface transition area, and belongs to the technical field of building material performance detection.
Background
The development of the world causes a great deal of waste, and the solid waste causes serious damage to the environment. From the perspective of social sustainable development, how to effectively treat and reuse solid waste is urgent. Relevant data statistics show that the concrete solid waste generated in the aspects of reconstruction and extension of buildings and demolition of old buildings in China every year reaches 0.3-0.4 hundred million tons. The continuous development of recycled aggregate concrete provides a solution for solving the problem. The large-scale production of recycled aggregate will reduce the impact of the concrete industry on the environment. The recycled aggregate concrete is new concrete prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded concrete blocks with a grading agent according to a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand stones and the like, and adding cement, water and the like. How the performance of recycled aggregate concrete can meet the structural stress requirement is widely concerned.
In concrete, there is a thin zone around the aggregate particles, which is referred to as the interfacial transition zone. The compactness and the strength of the area are far lower than those of a hardened body, the area is the weakest link in a concrete structure, and the structure and the performance of the transition area greatly restrict the overall structural performance of the concrete structure.
In the case of recycled aggregate concrete, the interface transition zone is a narrow area in the concrete between recycled aggregate and cement mortar, and the performance of the interface transition zone is influenced by multiple factors. The influence degree of the recycled aggregate on the interface transition area can directly influence the stress performance of the recycled concrete, so that the research on the influence degree of the recycled aggregate on the concrete interface transition area is necessary for the development and improvement of the recycled aggregate concrete. By looking up a large amount of documents, a simple and practical method for detecting the influence degree of the recycled aggregate on the concrete interface transition area is not seen at present, and on the background, the invention discloses a method for detecting the influence degree of the recycled aggregate on the concrete interface transition area.
Disclosure of Invention
In order to scientifically and effectively evaluate the influence degree of the recycled aggregate on the concrete interface transition area, fill up the blank that no method for detecting the influence degree of the recycled aggregate on the concrete interface transition area exists at present, and provide guarantee for the wide popularization of recycled aggregate concrete, the invention provides a method for detecting the influence degree of the recycled aggregate on the concrete interface transition area.
The technical scheme of the invention is as follows:
a method for detecting the influence degree of recycled aggregate on a concrete interface transition zone comprises the following steps,
step one, manufacturing a regenerated bone material block;
step two, vacuumizing the recycled aggregate block, and keeping the vacuum degree to suck the conductive ink;
step three, manufacturing conductive mortar;
placing the recycled aggregate blocks into the center of the mold and fixing, and ensuring that all sides of the aggregate are parallel to the mold;
pouring conductive mortar between the mold and the recycled aggregate block, vibrating and compacting, and maintaining for 28 days under standard conditions;
step six, drying the formed test block at the temperature of 70-90 ℃; the baking time is not less than 24 hours;
coating conductive silicone grease on two opposite surfaces of the test block, placing an electrode plate, and communicating the electrode plate with an impedance analyzer to perform alternating current impedance spectrum test; in an alternating current impedance spectrum test, frequency sweep is carried out by using the frequency with the range not narrower than 1 Hz-5 MHz, and the change curve of impedance along with the frequency is measured in the voltage range of 1 mV-50 mV, so as to obtain an impedance complex plan of a typical recycled aggregate concrete test block;
replacing the regenerated aggregate blocks with acrylic blocks with the same size, repeating the second step to the seventh step, and performing alternating current impedance spectrum test to obtain a typical acrylic concrete block impedance complex plan;
step nine, obtaining R through least square fitting of an equivalent circuit1、R1 *And R2、R2 *(ii) a Wherein R is1And R2Respectively is the minimum value and the maximum value of the real part in an impedance complex plane diagram of a typical recycled aggregate concrete test block, R1 *And R2 *Respectively representing the minimum value and the maximum value of a real part in an impedance complex plane diagram of a typical acrylic concrete test block;
step ten, passing through a formula
Calculating an influence factor P, and if P is 0, indicating that the influence of the recycled aggregate on an interface transition region is very weak; if P is equal to (0, 0.5)]The recycled aggregate has a more remarkable influence on the interface transition zone; if P ∈ (0.5, 1)]The recycled aggregate has obvious influence on the interface transition zone;if P>1, which shows that recycled aggregate has a significant effect on the interfacial transition zone.
Furthermore, the regenerated bone material block is a cube with the side length of 2-3 cm.
Further, in the third step, the preparation method of the conductive mortar comprises the steps of keeping the water cement ratio of 0.4-0.5, and stirring to obtain cement paste; putting the sand into the conductive ink solution to uniformly cover a layer of conductive substance on the surface of the sand; and (3) placing the sand into the cement paste, stirring to form the conductive mortar, and simultaneously ensuring that the mass ratio of the cement to the sand is 2:5-4: 5.
Further, the die is a cube with the side length twice as long as that of the recycled aggregate blocks.
Further, the die is a cube with the side length of 4-6 cm.
Further, in the fifth step, the vibration after the conductive mortar is filled between the die and the recycled aggregate blocks is carried out on a jump table or a vibration table.
Further, in the sixth step, the formed test block is placed in an oven to be baked.
Further, in the seventh step, the electrode plate is a stainless steel electrode plate, an aluminum electrode plate or a copper electrode plate.
The technical scheme of the invention has the following beneficial effects:
the method has relatively simple experimental process, and can simulate the state of the recycled aggregate in the actual recycled concrete through a small test piece.
The method can qualitatively evaluate the influence degree of the recycled aggregate on the interface transition region by calculating the characteristic value of the alternating-current impedance spectrum.
Drawings
FIG. 1 is a schematic view of a molded test block;
FIG. 2 is a schematic diagram illustrating the detection of the influence degree of recycled aggregate or acrylic aggregate on a concrete interface transition zone;
FIG. 3 is a simplified equivalent circuit diagram;
FIG. 4 is a complex impedance plan view of a recycled aggregate concrete test block;
fig. 5 is an impedance complex plan view of an acrylic concrete test block.
In the figure, 1-recycled aggregate or acrylic cube block; 2-conductive mortar concrete; 3-an electrode plate; 4-impedance analyzer; 5-resistance one; 6-resistance two; 7-capacitance.
Detailed Description
The invention will be further explained with reference to the drawings.
As shown in fig. 1, fig. 1 is a schematic diagram of a molded test block, and includes a recycled aggregate or acrylic cube block 1 located at a central position and conductive mortar concrete 2 wrapped outside the recycled aggregate or acrylic cube block 1, which together form the molded test block. The forming method of the molded test block comprises the steps of processing the recycled aggregate or acrylic into a cube with the side length of 2-3cm, vacuumizing, and sucking the conductive ink while keeping the vacuum degree. After the recycled aggregate or the acrylic is processed, the conductive mortar is prepared, and the preparation method comprises the following steps: keeping the water cement ratio at 0.4-0.5, and stirring to obtain cement paste; putting the sand into the conductive ink solution to uniformly cover a layer of conductive substance on the surface of the sand; and (3) placing the sand into the cement paste, stirring to form the conductive mortar, and simultaneously ensuring that the mass ratio of the cement to the sand is 2:5-4: 5. And (3) placing the recycled aggregate into the center of a mould with the side length of 4-6cm, and ensuring that each side of the aggregate is parallel to the mould. And (5) pouring conductive mortar, placing on a vibration table, vibrating to compact, and maintaining for 28 days under standard conditions. And drying the formed test block in an electric furnace at 70-90 ℃.
As shown in fig. 2, fig. 2 is a schematic view of a device for detecting the influence degree of recycled aggregate or acrylic aggregate on a concrete interface transition zone; coating conductive silicone grease on two opposite surfaces of a finished test block (the aggregate is recycled aggregate or the acryl cube block 1), placing an electrode plate 3 such as stainless steel, aluminum or copper and the like, and communicating the electrode plate 3 with an impedance analyzer 4 to perform alternating current impedance spectrum test. Frequency sweeping is carried out by using the frequency within the range of not less than 1Hz to 5MHz, a change curve of impedance along with the frequency is measured within the range of 1mV to 50mV, and then a complex plan view of electrochemical impedance is obtained, fig. 4 is a complex plan view of the impedance of a typical recycled aggregate concrete test block, and fig. 5 is a complex plan view of the impedance of a typical recycled aggregate concrete test block, wherein the horizontal axis is a real part, and the vertical axis is the opposite number of an imaginary part. FIG. 3 is an equivalent circuit, typically of the Randels typeThe circuit model, equivalent circuit, includes a resistor 5 (the resistance value is R)1Represented by R), a second resistor 6 (the resistance value of which is represented by R2Shown), a capacitor 7 (the value of which is shown by C), a second resistor 6 connected in parallel with the capacitor 7 and a first resistor 5 connected in series. FIGS. 4 and 5 and R obtained by least squares fit of equivalent circuit1、R1 *And R2、R2 *Wherein R is1And R2Respectively is the minimum value and the maximum value of the real part in an impedance complex plane diagram of a typical recycled aggregate concrete test block, R1 *And R2 *Respectively representing the minimum value and the maximum value of the real part in the impedance complex plane diagram of the typical acrylic concrete test block. Least squares fitting is generally performed by commercial software such as zsimwin, Zview, etc. By calculation of
The influence factor is obtained, and the influence factor is used for evaluating the relative strength of the influence degree of the recycled aggregate on the concrete interface transition area. The larger the value of the impact factor, the greater the impact of the recycled aggregate on the interfacial transition zone. If P is 0, the influence of the recycled aggregate on the interface transition zone is very weak; if P is equal to (0, 0.5)]The recycled aggregate has a more remarkable influence on the interface transition zone; if P ∈ (0.5, 1)]The recycled aggregate has obvious influence on the interface transition zone; if P>1, which shows that recycled aggregate has a significant effect on the interfacial transition zone.
The following is a specific test case guided by the core idea of the invention:
test pieces were produced as described above. The recycled aggregate and the acrylic aggregate are cubes with the side length of 2.6cm, and the Conductive ink is British Bare Conductive electronic ink. And introducing the surface layer of the aggregate into the conductive ink while maintaining the vacuum degree of not more than 1000 Pa. And putting the building door ISO standard sand into the conductive ink, uniformly stirring, and then drying to prepare the conductive mortar. The water-cement ratio of the conductive mortar is 0.4, and the sand-cement ratio is 3: 5. The adopted mould is a cube with the inner side length of 5cm, the two aggregates are respectively placed in the centers of the two identical moulds, and each side of the aggregates is ensured to be parallel to the mould. Pouring conductive mortar, placing on a vibrating table, vibrating, and markingAnd curing under the standard condition for 28 days. The molded test block was dried in an electric oven at 70 ℃ for 48 hours and prepared for testing. The dust on the surface of the test block is cleaned by a brush, Meibao T-50B conductive silicone grease is coated on two opposite surfaces of the same test block, and a stainless steel electrode plate is stuck on the test block, wherein the side length of the stainless steel electrode plate is 6cm, and the thickness of the stainless steel electrode plate is 1 mm. Leading out a lead wire to be connected to a daily HIOKI IM3570 precision impedance analyzer, setting the scanning voltage to be 10mV and the frequency range to be 4 Hz-4 MHz, and obtaining electrochemical impedance spectrum data through testing, wherein Nyquist graphs of the electrochemical impedance spectrum data are shown in fig. 4 and 5. Adopting ZsimWin software, performing parameter fitting based on Randels equivalent circuit model to respectively obtain R146 ohm, R2580 ohm, R1 *105 ohm, R2 *892 ohms. Using the formula
The calculation results in P ═ 0.35, and P ∈ (0, 0.5)]The recycled aggregate is shown to have a more significant effect on the interfacial transition zone.
The above embodiments are only given for illustrating the technical solutions of the present invention more clearly, and are not meant to limit the present invention, and the scope of the present invention is defined by the appended claims.
Claims (8)
1. A method for detecting the influence degree of recycled aggregate on a concrete interface transition zone comprises the following steps,
step one, manufacturing a regenerated bone material block;
step two, vacuumizing the recycled aggregate block, and keeping the vacuum degree to suck the conductive ink;
step three, manufacturing conductive mortar;
placing the recycled aggregate blocks into the center of the mold and fixing, and ensuring that all sides of the aggregate are parallel to the mold;
pouring conductive mortar between the mold and the recycled aggregate block, vibrating and compacting, and maintaining for 28 days under standard conditions;
step six, drying the formed test block at the temperature of 70-90 ℃; the baking time is not less than 24 hours;
coating conductive silicone grease on two opposite surfaces of the test block, placing an electrode plate, and communicating the electrode plate with an impedance analyzer to perform alternating current impedance spectrum test; in an alternating current impedance spectrum test, frequency sweeping is carried out by using the frequency within the range of 1 Hz-5 MHz, and the variation curve of impedance along with the frequency is measured within the range of 1 mV-50 mV, so as to obtain a typical recycled aggregate concrete test block impedance complex plan;
replacing the regenerated aggregate blocks with acrylic blocks with the same size, repeating the second step to the seventh step, and performing alternating current impedance spectrum test to obtain a typical acrylic concrete block impedance complex plan;
step nine, obtaining R through least square fitting of an equivalent circuit1、R1 *And R2、R2 *(ii) a Wherein R is1And R2Respectively is the minimum value and the maximum value of the real part in an impedance complex plane diagram of a typical recycled aggregate concrete test block, R1 *And R2 *Respectively representing the minimum value and the maximum value of a real part in an impedance complex plane diagram of a typical acrylic concrete test block;
step ten, passing through a formula
Calculating an influence factor P, and if P is 0, indicating that the influence of the recycled aggregate on an interface transition region is very weak; if P is equal to (0, 0.5)]The recycled aggregate has a more remarkable influence on the interface transition zone; if P ∈ (0.5, 1)]The recycled aggregate has obvious influence on the interface transition zone; if P is more than 1, the recycled aggregate has a remarkable influence on the interface transition zone.
2. The method for detecting the influence degree of the recycled aggregate on the concrete interface transition area according to claim 1, wherein the method comprises the following steps: the regenerated bone material block is a cube with the side length of 2-3 cm.
3. The method for detecting the influence degree of the recycled aggregate on the concrete interface transition area according to claim 1, wherein the method comprises the following steps: in the third step, the preparation method of the conductive mortar comprises the steps of keeping the water cement ratio of 0.4-0.5, and stirring to form cement paste; putting the sand into the conductive ink solution to uniformly cover a layer of conductive substance on the surface of the sand; and (3) placing the sand into the cement paste, stirring to form the conductive mortar, and simultaneously ensuring that the mass ratio of the cement to the sand is 2:5-4: 5.
4. The method for detecting the influence degree of the recycled aggregate on the concrete interface transition area according to claim 1, wherein the method comprises the following steps: the die is a cube with the side length twice as long as that of the recycled aggregate blocks.
5. The method for detecting the influence degree of the recycled aggregate on the concrete interface transition zone according to claim 4, wherein the method comprises the following steps: the die is a cube with the side length of 4-6 cm.
6. The method for detecting the influence degree of the recycled aggregate on the concrete interface transition area according to claim 1, wherein the method comprises the following steps: and in the fifth step, the vibration after the conductive mortar is filled between the die and the recycled aggregate block is carried out on a jump table or a vibration table.
7. The method for detecting the influence degree of the recycled aggregate on the concrete interface transition area according to claim 1, wherein the method comprises the following steps: and sixthly, placing the molded test block in an oven for baking.
8. The method for detecting the influence degree of the recycled aggregate on the concrete interface transition area according to claim 1, wherein the method comprises the following steps: in the seventh step, the electrode plate is a stainless steel electrode plate, an aluminum electrode plate or a copper electrode plate.
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