CN114689636B - Recycled aggregate moisture migration characterization method based on low-field nuclear magnetic resonance technology - Google Patents
Recycled aggregate moisture migration characterization method based on low-field nuclear magnetic resonance technology Download PDFInfo
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Abstract
The invention discloses a low-field nuclear magnetic resonance technology-based recycled aggregate moisture migration characterization method, which comprises the following steps: s1, preparing a simulated recycled aggregate; s2, preparing fresh slurry, and adding the slurry into the recycled aggregate obtained in the step S1; s3, respectively and continuously acquiring one-dimensional frequency coding signals and transverse relaxation attenuation signals of different time after the simulated recycled aggregate is contacted with the fresh slurry body through a GR-HSE pulse sequence and a CPMG pulse sequence of a low-field nuclear magnetic resonance analyzer; and S4, processing and drawing the data in the step S3. According to the present invention, the method is a nondestructive testing method, does not damage the microstructure of the sample and can continuously test for a long time. The test process is convenient and quick, the migration condition of water at the interface of the recycled aggregate and the fresh concrete can be accurately represented, and guidance is provided for adding additional water consumption of the recycled aggregate concrete.
Description
Technical Field
The invention relates to the technical field of building materials, in particular to a method for representing moisture migration of recycled aggregate based on a low-field nuclear magnetic resonance technology.
Background
The recycled aggregate is obtained by crushing and grading waste concrete. The waste concrete is effectively utilized as the concrete coarse aggregate, so that the problem of secondary utilization of solid waste of the building can be solved, the consumption of natural rock resources can be reduced, and the method has important significance on environmental protection and sustainable development.
The recycled aggregate is mostly natural aggregate or pure mortar blocks wrapped by old mortar. Due to the existence of the old mortar layer, compared with natural aggregate, the recycled aggregate has the characteristics of high porosity and high water absorption. The high water absorption rate enables the recycled aggregate to absorb water in the mortar in the fresh concrete, changes the actual water content of the fresh concrete slurry and enables the slump loss rate of the fresh concrete to be larger than that of the natural aggregate concrete. Meanwhile, the recycled aggregate absorbs water to reduce the actual water-cement ratio in recycled concrete, possibly causing partial cementing materials to be insufficiently hydrated, and being not beneficial to the strength increase of the concrete.
In order to solve the problem of high water absorption of recycled aggregates, researchers often use additional water to supplement the water absorbed by the recycled aggregates in the concrete when designing the mix proportion of recycled concrete. The additional water consumption is usually calculated according to the water absorption rate of the recycled aggregate, and the obtained additional water consumption is probably higher than the water actually absorbed by the recycled aggregate in concrete, because the water absorption process of the recycled aggregate and the cement hydration process are carried out synchronously, a large amount of water is consumed in the cement hydration, and the water amount which can be absorbed by the recycled aggregate can be greatly reduced. Therefore, the method is very important for accurately representing the moisture migration behavior in the recycled aggregate, and can provide powerful technical support for the mix proportion design of recycled concrete.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a recycled aggregate moisture migration characterization method based on a low-field nuclear magnetic resonance technology. The method is a nondestructive testing method, does not damage the microstructure of the sample, and can continuously test for a long time. The testing process is convenient and quick, the actual water absorption condition of the recycled aggregate in the concrete can be accurately represented, and guidance is provided for accurate calculation of additional water consumption. To achieve the above objects and other advantages and in accordance with the purpose of the invention, there is provided a recycled aggregate moisture migration characterization method based on low-field nuclear magnetic resonance technology, comprising:
s1, preparing a simulated recycled aggregate;
s2, preparing fresh slurry, and adding the slurry into the recycled aggregate in the step S1;
s3, respectively and continuously acquiring one-dimensional frequency coding signals and nuclear magnetic resonance transverse relaxation attenuation signals at different time after the simulated recycled aggregate is contacted with the fresh slurry body through a GR-HSE pulse sequence and a CPMG pulse sequence of a low-field nuclear magnetic resonance analyzer; and S4, processing and drawing the data in the step S3.
Preferably, the step S1 of preparing the simulated recycled aggregate is to weigh cement, sand, water and a water reducing agent, stir the materials into uniform slurry by a planetary mortar mixer, pour the stirred slurry into a sample bottle for molding, and slightly shake the sample bottle to level the slurry. And after the molding, placing the molded recycled aggregate indoors for 24 hours, then placing the molded recycled aggregate into a saturated calcium hydroxide solution with the temperature of 20 +/-2 ℃ for curing to a specified age, drying the simulated recycled aggregate at a low temperature to constant weight after the specified age is reached, removing mortar attached to the inner wall of the sample bottle by using abrasive paper, and polishing a molding surface to ensure that all the simulated recycled aggregate are consistent in height.
Preferably, the cement, the sand, the water and the water reducing agent are weighed in the step S2, stirred for 1min by a handheld stirrer and then poured into a sample bottle, the sample bottle is sealed and then vertically placed into a low-field nuclear magnetic resonance analyzer, and parameters of the low-field nuclear magnetic resonance analyzer are set.
Preferably, in step S3, one-dimensional frequency coding signals at different times after the simulated recycled aggregate and the fresh slurry body are contacted are acquired through a GR-HSE pulse sequence of the low-field nuclear magnetic resonance analyzer, a relation curve between the amount of free water signals at a position x and the position x after different contact times is drawn, so that the water migration depth at any time after the simulated recycled aggregate and the fresh slurry body are contacted can be read, a CPMG pulse sequence of the low-field nuclear magnetic resonance analyzer acquires nuclear magnetic resonance transverse relaxation attenuation signals at different times after the simulated recycled aggregate and the fresh slurry body are contacted, inversion is performed on a test result, and a relation curve between the amount of free water signals and the transverse relaxation time after different contact times is drawn.
Preferably, the cement in the step S1 is P.W 42.5 white portland cement, the water cement ratio is 0.4-0.55, the sand cement ratio is 1.2-1.4, the mixing amount of the water reducing agent is 0.03-0.05%, the material of the sample bottle is polyethylene terephthalate or polytetrafluoroethylene, and the inner wall of the sample bottle needs to be polished to be rough before the recycled aggregate is molded.
Preferably, the height of the simulated recycled aggregate in the step S1 is 29-31 mm, and the total height is not more than 65mm after the fresh slurry is added. The simulated recycled aggregate curing age is not less than 28d, and the drying temperature is not more than 40 ℃.
Preferably, the cement used in the fresh slurry in step S2 is P.W 52.5 white portland cement, the water cement ratio is 0.3-0.5, the sand cement ratio is 1.1-1.3, and the mixing amount of the water reducing agent is 0.01%.
Preferably, the sand used for simulating the recycled aggregate and the fresh slurry body in the step S1 and the step S2 is ISO standard sand, and the used water reducing agent is a polycarboxylic acid water reducing agent.
Preferably, in step S3, the sampling frequency of the GR-HSE pulse sequence is 50kHz, the number of accumulation times is 64, the echo time is 2.50000ms, the test interval is 10min, and the test is continued for 24h.
Preferably, the sampling frequency of the CPMG pulse sequence in step S3 is 250kHz, the number of accumulation times is 32, the echo time is 0.20000ms, the number of echoes is 3000, the test interval is 10min, and the test is continued for 24h.
Compared with the prior art, the invention has the beneficial effects that:
(1) Compared with the traditional characterization method for the moisture migration of the recycled aggregate, the method can be closer to the real situation of the recycled aggregate in concrete, and can provide guidance for accurate calculation of additional water consumption.
(2) The method is a nondestructive testing method, the microstructure of the sample cannot be damaged, the continuous long-time detection can be realized, the testing process is convenient and fast, and the sample consumption is small.
Drawings
FIG. 1 is a sample object diagram of a recycled aggregate moisture migration characterization method based on a low-field nuclear magnetic resonance technology according to the invention;
FIG. 2 is a diagram of a test result of a CPMG pulse sequence of the method for representing the moisture migration of the recycled aggregate based on the low-field nuclear magnetic resonance technology;
FIG. 3 is a diagram of the test result of a CPMG pulse sequence of the method for characterizing the moisture migration of the recycled aggregate based on the low-field nuclear magnetic resonance technology;
FIG. 4 is a graph of the test results of GR-HSE pulse sequence of the recycled aggregate moisture migration characterization method based on low-field nuclear magnetic resonance technology according to the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It should be apparent that the described embodiments are only some 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.
Referring to fig. 1-4, a method for representing moisture migration of recycled aggregate based on low-field nuclear magnetic resonance technology comprises the following steps:
s1, preparing a simulated recycled aggregate;
s2, preparing fresh slurry, and adding the slurry into the recycled aggregate in the step S1;
s3, respectively and continuously acquiring one-dimensional frequency coding signals and nuclear magnetic resonance transverse relaxation attenuation signals at different time after the simulated recycled aggregate is contacted with the fresh slurry body through a GR-HSE pulse sequence and a CPMG pulse sequence of a low-field nuclear magnetic resonance analyzer;
and S4, processing and drawing the data in the step S3.
Further, the step S1 of preparing the simulated recycled aggregate is that cement, sand, water and a water reducing agent are weighed and stirred into uniform slurry by a planetary mortar stirrer, the stirred slurry is poured into a sample bottle for molding, slight vibration is carried out to level the slurry, the simulated recycled aggregate is placed indoors for 24 hours after being molded, then the molded simulated recycled aggregate is placed into a saturated calcium hydroxide solution with the temperature of 20 +/-2 ℃ for curing to a specified age, after the specified age is reached, the simulated recycled aggregate is dried at low temperature to constant weight, mortar attached to the inner wall of the sample bottle is removed by abrasive paper, and a molding surface is polished to enable the heights of all the simulated recycled aggregate to be consistent.
Further, cement, sand, water and a water reducing agent are weighed in the step S2, stirred for 1min by a handheld stirrer and poured into a sample bottle immediately, the sample bottle is sealed and then vertically placed into a low-field nuclear magnetic resonance analyzer immediately, and parameters of the low-field nuclear magnetic resonance analyzer are set.
Further, in step S3, one-dimensional frequency coding signals at different times after the simulated recycled aggregate and the fresh slurry body are contacted are acquired through a GR-HSE pulse sequence of the low-field nuclear magnetic resonance analyzer, and a relation curve of the amount of free water signals at the position x and the position x after different contact times is drawn, so that the water migration depth at any time after the simulated recycled aggregate and the fresh slurry body are contacted can be read. And a CPMG pulse sequence of the low-field nuclear magnetic resonance analyzer acquires nuclear magnetic resonance transverse relaxation attenuation signals at different time after the simulated recycled aggregate and the fresh slurry body are contacted, inverts the test result, and draws a relation curve of the free water signal amount and the transverse relaxation time after different contact time.
Furthermore, in the step S1, the cement is P.W 42.5 white portland cement, the water-cement ratio is 0.4-0.55, the sand-cement ratio is 1.2-1.4, the mixing amount of the water reducing agent is 0.03-0.05%, the material of the sample bottle is polyethylene terephthalate or polytetrafluoroethylene, and the inner wall of the sample bottle needs to be polished to be rough before the sample bottle is molded to form recycled aggregate.
Further, the height of the simulated recycled aggregate in the step S1 is 29-31 mm, and the total height is not more than 65mm after the fresh slurry is added. The simulated recycled aggregate curing age is not less than 28d, and the drying temperature is not more than 40 ℃.
Furthermore, the cement used in the fresh slurry in the step S2 is P.W 52.5 white Portland cement, the water cement ratio is 0.3-0.5, the sand cement ratio is 1.1-1.3, and the mixing amount of the water reducing agent is 0.01%.
Furthermore, the sand used for simulating the recycled aggregate and the fresh slurry body in the step S1 and the step S2 is ISO standard sand, and the used water reducing agent is a polycarboxylic acid water reducing agent.
Further, in the step S3, the sampling frequency of the GR-HSE pulse sequence is 50kHz, the number of accumulation times is 64, the echo time is 2.5ms, the test interval is 10min, and the test is continued for 24h.
Further, in step S3, the sampling frequency of the CPMG pulse sequence is 250kHz, the number of accumulation times is 32, the echo time is 0.2ms, the number of echoes is 3000, the test interval is 10min, and the test is continuously performed for 24h.
Example 1
The simulated recycled aggregate has a water-cement ratio of 0.55 and a sand-cement ratio of 1.3, a water reducing agent is not used, and the cement is P.W 42.5 white portland cement. The sample bottle is made of polyethylene terephthalate, the height of the sample bottle is 85mm, the caliber of the sample bottle is 55mm, and the sample bottle is colorless and transparent.
Weighing cement, sand and water, stirring the materials into uniform slurry by a planetary mortar stirrer, pouring the stirred slurry into a sample bottle for molding at once, and slightly vibrating the slurry to level the slurry, wherein the height of the slurry is 30mm. And (3) after the simulated recycled aggregate is molded, placing the molded simulated recycled aggregate indoors for 24 hours, and then placing the molded simulated recycled aggregate into a saturated calcium hydroxide solution at the temperature of 20 +/-2 ℃ for curing to 180 days. And after 180 days, drying the simulated recycled aggregate at 30 ℃ to constant weight, removing mortar attached to the inner wall of the sample bottle by using abrasive paper, and polishing the simulated recycled aggregate into a molded surface to remove surface sediments.
The water cement ratio of the fresh slurry is 0.5, the sand cement ratio is 1.2, and the cement is P.W 52.5 white portland cement. Cement, sand and water were weighed, stirred for 1min with a hand-held mixer and immediately poured into a sample bottle, and the sample was as shown in fig. 1. After the sample vial was sealed, it was immediately placed vertically in a low field nuclear magnetic resonance analyzer to begin the test.
The parameters of the GR-HSE pulse sequence are set as follows: the sampling frequency is 50kHz, the analog gain is 10.0dB, the accumulation frequency is 64, and the echo time is 2.5ms. The parameters of the CPMG pulse sequence are set as: the sampling frequency is 250kHz, the analog gain is 20.0dB, the accumulation times are 32, the echo time is 0.2ms, and the number of echoes is 3000. Setting automatic test with 10min test interval and continuous test for 24h.
After data processing and inversion, the test results of the GR-HSE pulse sequence are shown in FIG. 2. In FIG. 2, fresh slurry is in a range of 25mm to 55mm, and simulated recycled aggregate is in a range of 55mm to 85 mm. As the cement hydration progresses, the free water in the fresh slurry body is reduced, the signal quantity is reduced in the range of 25-55 mm displayed on the image, and meanwhile, the signal quantity at the 55mm position is reduced more than the average value of the signal quantity reduced by the fresh slurry body at the 60min, 120min and 180min, which shows that the signal quantity at the interface of the fresh slurry body and the old slurry body is reduced due to the fact that the simulated recycled aggregate absorbs water in addition to the consumption of the cement hydration to the water.
The test results of the CPMG pulse sequence are shown in FIG. 3. At time T of 0min 2 The spectrogram has two peaks, wherein the peak within the range of 0.1-1.1 ms represents residual moisture inside the simulated recycled aggregate after low-temperature drying, and the peak within the range of 5-100 ms represents free water with long relaxation time in the fresh slurry. As the hydration of the cement and the penetration of moisture proceed,simulating the rise of the water content in the recycled aggregate and increasing the signal quantity; free water in the fresh slurry body is reduced, the fresh slurry body is converted into bound water, the relaxation time of water molecules is shortened, the signal quantity is reduced, and the peak value is shifted to the left. After the early hydration was substantially over, only one peak was present in the sample vial.
Example 2
The simulated recycled aggregate has a water-cement ratio of 0.55 and a sand-cement ratio of 1.3, a water reducing agent is not used, and the cement is P.W 42.5 white portland cement. The sample bottle is made of polyethylene terephthalate, is 85mm high and 55mm in caliber, and is colorless and transparent.
Weighing cement, sand and water, stirring the materials into uniform slurry by a planetary mortar stirrer, pouring the stirred slurry into a sample bottle for molding immediately, and slightly vibrating the sample bottle to level the slurry with the height of 30mm. And (3) after the simulated recycled aggregate is molded, placing the molded simulated recycled aggregate indoors for 24 hours, and then placing the molded simulated recycled aggregate into a saturated calcium hydroxide solution at the temperature of 20 +/-2 ℃ for curing for 180 days. And after 180 days, drying the simulated recycled aggregate at 30 ℃ to constant weight, removing mortar attached to the inner wall of the sample bottle by using sand paper, and polishing the sand paper into a molded surface to remove surface sediments.
Deionized water is used for replacing newly mixed mortar, and 30mm of deionized water is added on the simulated recycled aggregate. After the sample vial was sealed, it was immediately placed vertically in a low field nuclear magnetic resonance analyzer to begin the test.
The parameters of the GR-HSE pulse sequence are set as follows: the sampling frequency is 50kHz, the analog gain is 10.0dB, the accumulation frequency is 64, and the echo time is 2.5ms. The parameters of the CPMG pulse sequence are set as: the sampling frequency is 250kHz, the analog gain is 20.0dB, the accumulation times are 32, the echo time is 0.2ms, and the number of echoes is 3000. Setting automatic test with 10min test interval and continuous test for 24h.
After data processing and inversion, the test results of the GR-HSE pulse sequence are shown in FIG. 4. In FIG. 4, fresh slurry is in a range of 25mm to 55mm, and simulated recycled aggregate is in a range of 55mm to 85 mm. And when 0min, simulating that the moisture signal in the recycled aggregate is zero, wherein the curve is a straight line. After the simulated recycled aggregate is contacted with the fresh slurry, the water begins to permeate, and the water can be seen to permeate about 5mm after 10 min. With the progress of water infiltration, the signal curve in the simulated recycled aggregate continuously moves to the right, and the curve is stable when about 300min, namely the simulated recycled aggregate is saturated with water, and the water infiltration is about 25mm at the moment. Meanwhile, as the water continuously permeates into the simulated recycled aggregate, the liquid level of the water body continuously drops, and a curve within a 20-30 mm interval is continuously moved rightwards in the graph of fig. 4.
The number of devices and the scale of the processes described herein are intended to simplify the description of the invention, and applications, modifications and variations of the invention will be apparent to those skilled in the art.
While embodiments of the invention have been described above, it is not intended to be limited to the details shown, described and illustrated herein, but is to be accorded the widest scope consistent with the principles and novel features herein disclosed, and to such extent that such modifications are readily available to those skilled in the art, and it is not intended to be limited to the details shown and described herein without departing from the general concept as defined by the appended claims and their equivalents.
Claims (5)
1. A recycled aggregate moisture migration characterization method based on a low-field nuclear magnetic resonance technology is characterized by comprising the following steps:
s1, preparing simulated recycled aggregate, wherein the preparation of the simulated recycled aggregate is that cement, sand, water and a water reducing agent are weighed and stirred into uniform slurry by a planetary mortar stirrer, the stirred slurry is poured into a sample bottle for molding, the slurry is leveled by slight vibration, the molded slurry is placed indoors for 24 hours, then the molded slurry is placed into a saturated calcium hydroxide solution at the temperature of 20 +/-2 ℃ for curing to a specified age, after the specified age is reached, the simulated recycled aggregate is dried at low temperature to constant weight, mortar attached to the inner wall of the sample bottle is removed by abrasive paper, and a molding surface is polished to enable all the simulated recycled aggregates to be consistent in height;
s2, preparing fresh slurry, adding the slurry into the recycled aggregate obtained in the step S1, weighing cement, sand, water and a water reducing agent, stirring for 1min by using a handheld stirrer, immediately pouring into a sample bottle, sealing the sample bottle, immediately and vertically placing into a low-field nuclear magnetic resonance analyzer, and setting parameters of the low-field nuclear magnetic resonance analyzer;
s3, respectively and continuously acquiring one-dimensional frequency coding signals and nuclear magnetic resonance transverse relaxation attenuation signals of different time after the simulated regeneration aggregate and the fresh slurry body are contacted through a GR-HSE pulse sequence and a CPMG pulse sequence of a low-field nuclear magnetic resonance analyzer, respectively and continuously acquiring one-dimensional frequency coding signals of different time after the simulated regeneration aggregate and the fresh slurry body are contacted through the GR-HSE pulse sequence of the low-field nuclear magnetic resonance analyzer, drawing a relation curve of the amount of free water signals and the position x at the position x after different contact time, reading the water migration depth at any moment after the simulated regeneration aggregate and the fresh slurry body are contacted, acquiring nuclear magnetic resonance transverse relaxation attenuation signals of different time after the simulated regeneration aggregate and the fresh slurry body are contacted through the CPMG pulse sequence of the low-field nuclear magnetic resonance analyzer, drawing a relation curve of the amount of free water signals and the transverse relaxation time after different contact time, wherein the sampling frequency of the HSGR-HSE pulse sequence is 50kHz, the cumulative number of echo time is 64, the echo time is 2.5ms, the test interval is 10min, the cumulative echo number of continuous test h, the cumulative echo frequency of the CPMG sequence is 250, the cumulative echo frequency of the test interval is 3000 h, the test interval is 3000 h is 3000, the test interval is 3000 h, the echo time is 3000.2.5 ms, and the echo time is 3000 h;
and S4, processing and drawing the data in the step S3.
2. The method for characterizing the moisture migration of the recycled aggregate based on the low-field nuclear magnetic resonance technology as claimed in claim 1, wherein the cement in the step S1 is P.W 42.5 white portland cement, the water cement ratio is 0.4 to 0.55, the sand cement ratio is 1.2 to 1.4, the mixing amount of the water reducing agent is 0.03 to 0.05%, the material of the sample bottle is polyethylene terephthalate or polytetrafluoroethylene, and the inner wall of the sample bottle needs to be roughened before the recycled aggregate is molded.
3. The method for characterizing the moisture migration of the recycled aggregate based on the low-field nuclear magnetic resonance technology as claimed in claim 2, wherein the height of the simulated recycled aggregate in the step S1 is 29-31mm, the total height of the slurry after the slurry is added is not more than 65mm, the maintenance age of the simulated recycled aggregate is not less than 28d, and the drying temperature is not more than 40 ℃.
4. The method for characterizing the water migration of the recycled aggregate based on the low-field nuclear magnetic resonance technology as claimed in claim 1, wherein the cement used in the fresh slurry body in the step S2 is P.W 52.5 white portland cement, the water cement ratio is 0.3 to 0.5, the sand cement ratio is 1.1 to 1.3, and the mixing amount of the water reducing agent is 0.01%.
5. The method for characterizing the moisture migration of the recycled aggregate based on the low-field nuclear magnetic resonance technology as claimed in claim 1, wherein the sand used for simulating the recycled aggregate and the fresh slurry body in the steps S1 and S2 is ISO standard sand, and the water reducing agent used is a polycarboxylic acid water reducing agent.
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| Investigation of hydration and setting process in nanosilica-cement blended pastes: In situ characterization using low field nuclear magnetic resonance;Anming She et al.;《Construction and Building Materials》;20210826;第304卷;124631 * |
| 基于低场核磁共振技术的水泥浆体孔结构与比表面积的原位表征;佘安明等;《武汉理工大学学报》;20131030(第10期);全文 * |
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Inventor after: She Anming Inventor after: Ding Yangfei Inventor after: Yao Wu Inventor before: She Anming Inventor before: Ding Yangfei Inventor before: Yao Wu Inventor before: Ji Kensong Inventor before: Ge Kailiang |