CN112697635B - Method and system for testing water absorption of regenerated coarse aggregate - Google Patents
Method and system for testing water absorption of regenerated coarse aggregate Download PDFInfo
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Abstract
The invention relates to the technical field of measurement of regenerated coarse aggregates, and discloses a method and a system for testing the water absorption of regenerated coarse aggregates, wherein the method comprises the following steps: measuring the mass m of the dried reclaimed coarse aggregate1(ii) a Placing the basket containing the regenerated coarse aggregate in water with a preset temperature to allow the regenerated coarse aggregate to stand in the water for 1440min, and respectively collecting the mass M of the regenerated coarse aggregate in the water with the water absorption time of T and 1440minTAnd M1(ii) a Taking out the regenerated coarse aggregate, wiping the regenerated coarse aggregate to a saturated surface dry state, and measuring the mass m of the regenerated coarse aggregate in the saturated surface dry state2(ii) a Calculating the water absorption W of the regenerated coarse aggregate when the water absorption time is TT=（MT+m2‑m1‑M1）/m1X 100%. The water absorption rate at any time within 0-1440 min can be obtained by setting T, and the early water absorption rate of the regenerated coarse aggregate, especially the water absorption rate of the first 10min, is convenient for estimating the influence of the regenerated coarse aggregate on the slump of cement concrete.
Description
Technical Field
The invention relates to the technical field of measurement of regenerated coarse aggregates, in particular to a method and a system for testing water absorption of regenerated coarse aggregates.
Background
The traditional method for testing the water absorption of the primary coarse aggregate is to soak the primary coarse aggregate in water for 24 hours, then take out the primary coarse aggregate, wipe the primary coarse aggregate to a saturated surface dry state by using a water absorption material, weigh the primary coarse aggregate, and calculate the water absorption after drying. But because the regenerated coarse aggregate has large mortar content, high water absorption rate and large water absorption capacity, the regenerated coarse aggregate is close to saturation within 5-10 min after being put into water. When the water absorption test method of the primary coarse aggregate is adopted to test the water absorption of the regenerated coarse aggregate, the water absorption test is inaccurate, so that the concrete slump is large when the regenerated coarse aggregate is used for mixing cement concrete. Therefore, for the regenerated coarse aggregate, the early water absorption of the regenerated coarse aggregate needs to be tested.
After the regenerated coarse aggregate is taken out of water, the water-absorbing material is used for wiping the regenerated coarse aggregate to a dry state for at least 5min, and the specific time depends on the proficiency of a tester, so that the time required for wiping the regenerated coarse aggregate to the dry state is different from the wiping degree; and the regenerated coarse aggregate still absorbs water continuously in the wiping process, which time of the water absorption rate obtained by calculation cannot be determined, and the shorter the time of soaking the regenerated coarse aggregate in water, the greater the limitation of the method for testing the water absorption rate in the manner described above, and even the case that the water absorption rate is higher when the regenerated coarse aggregate is soaked for 5min than when the regenerated coarse aggregate is soaked for 10min may occur.
Disclosure of Invention
The invention aims to provide a method and a system for testing the water absorption of a regenerated coarse aggregate, which can accurately test the early water absorption of the regenerated coarse aggregate so as to estimate the influence of the regenerated coarse aggregate on the slump of cement concrete.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for testing the water absorption of regenerated coarse aggregates comprises the following steps:
measuring the mass m of the dried reclaimed coarse aggregate1；
Placing the net basket containing the regenerated coarse aggregateStanding the regenerated coarse aggregate in water at a preset temperature for 1440min, and respectively collecting the mass M of the regenerated coarse aggregate in water with the water absorption time of T and 1440minTAnd M1,0＜T＜1440min；
Taking out the regenerated coarse aggregate, wiping the regenerated coarse aggregate to a saturated surface dry state, and measuring the mass m of the regenerated coarse aggregate in the saturated surface dry state2；
Calculating the water absorption W of the regenerated coarse aggregate when the water absorption time is TT=（MT+m2-m1-M1）/m1×100%。
As a preferred technical scheme of the testing method for the water absorption of the regenerated coarse aggregates, the water absorption time length T is acquired according to a preset time sequenceiMass M in water of time-regenerated coarse aggregateTiI is an integer which is more than or equal to 1 and less than or equal to N, and N is used for measuring the total times of the mass of the regenerated coarse aggregate water;
the water absorption time is TiWater absorption W of recycled coarse aggregateTi=（MTi+m2-m1-M1）/m1X 100%, T is T1To TN-1At any one time point of, TN＝1440min。
As a preferred technical solution of the method for testing the water absorption of the regenerated coarse aggregates, the preset time sequence is divided into at least two time stages according to the time sequence, and in two adjacent time stages, the time interval between two adjacent times of collecting the mass in the water of the regenerated coarse aggregates in the previous time stage is smaller than the time interval between two adjacent times of collecting the mass in the water of the regenerated coarse aggregates in the next time stage.
As a preferred technical scheme of the testing method for the water absorption of the regenerated coarse aggregates, the preset time sequence is divided into four time stages according to the time sequence, wherein the four time stages are respectively 0-10 min, 10-20 min, 20-60 min and 60-1440 min.
As a preferable technical scheme of the testing method for the water absorption of the regenerated coarse aggregates, the T is1≤10min。
As a preferred technical scheme of the testing method for the water absorption of the regenerated coarse aggregates, at least two parts of dried regenerated coarse aggregates are used;
the water absorption of the regenerated coarse aggregates when the water absorption duration is T is the average value of the water absorption of all the regenerated coarse aggregates when the water absorption duration is T.
In order to achieve the above object, the present invention further provides a system for testing water absorption of regenerated coarse aggregates, comprising:
the net basket is used for containing the regenerated coarse aggregate;
the upper end of the net basket is connected with the balance, and the balance is used for measuring the mass of the regenerated coarse aggregate;
the water tank is used for containing water to ensure that the regenerated coarse aggregates in the net basket are statically placed in the water tank;
also comprises a controller and an intelligent terminal, wherein the controller comprises a communication module, a main control module and a data acquisition module, the main control module is respectively in communication connection with the data acquisition module and the intelligent terminal through the communication module, the balance is in communication connection with the data acquisition module through the communication module, the communication module is used for transmitting remote execution signals, control signals and balance data signals among the intelligent terminal, the main control module and the data acquisition module, the main control module is used for receiving a remote execution signal sent by the intelligent terminal through the communication module and forming the remote execution signal into a control signal so as to control the balance according to the control signal, and the communication module is used for receiving the balance data signals collected by the data collection module, processing the balance data signals and sending the balance data signals to the intelligent terminal in real time.
As an optimal technical scheme of the system for testing the water absorption of the regenerated coarse aggregate, the communication mode of the main control module and the intelligent terminal comprises an APP remote network communication mode, a Wi-Fi communication mode or a Bluetooth communication mode.
As a preferable technical solution of the above system for testing water absorption of recycled coarse aggregates, the intelligent terminal includes at least one of a mobile phone, a laptop, a tablet or an intelligent wearable device.
As an optimal technical scheme of the system for testing the water absorption of the regenerated coarse aggregates, the intelligent terminal is further used for inputting and displaying a time interval between two adjacent times of collecting the water quality of the regenerated coarse aggregates, displaying the water quality of the regenerated coarse aggregates in real time, and automatically displaying a relation curve between the water absorption of the regenerated coarse aggregates and the water absorption duration after the test is finished.
The invention has the beneficial effects that:
the invention provides a method for testing the water absorption of a regenerated coarse aggregate, which can obtain the water absorption at any time within 0-1440 min by setting the water absorption duration T, accurately test the early water absorption of the regenerated coarse aggregate, particularly test the water absorption 10min before the regenerated coarse aggregate, and is convenient for estimating the influence of the regenerated coarse aggregate on the slump of cement concrete.
The invention also provides a system for testing the water absorption rate of the regenerated coarse aggregate, which measures the quality of the regenerated coarse aggregate in water at any time through the balance, can remotely control and observe the measurement condition of the balance in real time due to the arrangement of the controller and the intelligent terminal, does not need workers to pay attention to the test process of the water absorption rate of the regenerated coarse aggregate at any time, can also accurately obtain the relation curve and detailed data of the water absorption rate of the regenerated coarse aggregate from 0min to 10min, which cannot be accurately measured by the current aggregate water absorption rate test system, provides a convenient way for test researchers to test the water absorption characteristics of the regenerated aggregate, and provides a possibility for engineering technicians to quantitatively evaluate and master the early water absorption characteristics of different regenerated coarse aggregates, thereby prejudging the working performance of concrete.
According to the water absorption characteristic of the regenerated coarse aggregate, the preset time sequence is divided into at least two time stages, in the two adjacent time stages, the time interval of the mass in the water collected twice by the regenerated coarse aggregate in the previous time stage is smaller than the time interval of the mass in the water collected twice by the regenerated coarse aggregate in the next time stage, and the water absorption characteristic of each time stage can be further known in detail.
The time interval of the quality of the regenerated coarse aggregate water collected twice in each time stage can be set according to the water absorption characteristic of the regenerated coarse aggregate, and the data redundancy is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments of the present invention will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the contents of the embodiments of the present invention and the drawings without creative efforts.
FIG. 1 is a water absorption testing system for reclaimed coarse aggregates provided by the present invention;
FIG. 2 is a control circuit diagram of the balance, the controller and the intelligent terminal provided by the invention;
FIG. 3 is a display interface diagram of a display module of the system for testing water absorption of reclaimed coarse aggregates provided by the present invention;
FIG. 4 is a flow chart of the method for testing the water absorption of the reclaimed coarse aggregates provided by the present invention;
FIG. 5 is a graph showing the relationship between water absorption duration and water absorption within 0-10 min, obtained by the method for testing the water absorption of the recycled coarse aggregates provided by the present invention;
FIG. 6 is a graph showing the relationship between water absorption duration and water absorption within 0-60 min, obtained by the method for testing the water absorption of the recycled coarse aggregates provided by the present invention;
FIG. 7 is a graph showing the relationship between water absorption duration and water absorption within 0min to 1440min, obtained by the method for testing the water absorption of the recycled coarse aggregates of the present invention.
In the figure:
1. a basket; 2. a balance; 3. a water tank; 4. a notebook computer; 5. a mobile phone; 6. and (7) mounting a bracket.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some but not all of the elements associated with the present invention are shown in the drawings.
As shown in fig. 1 to 3, the present embodiment provides a system for testing water absorption of regenerated coarse aggregates, including a basket 1, a balance 2, a sink 3, a controller and an intelligent terminal, wherein the basket 1 is used for containing the regenerated coarse aggregates; the upper end of the basket 1 is connected with the balance 2, and the balance 2 is used for measuring the mass of the regenerated coarse aggregate; the water tank 3 is used for containing water to ensure that the regenerated coarse aggregate in the net basket 1 is statically placed in the water tank 3; the controller comprises a communication module, a main control module and a data acquisition module, wherein the main control module is respectively in communication connection with the data acquisition module and the intelligent terminal through the communication module, the balance 2 is in communication connection with the data acquisition module through the communication module, the communication module is used for enabling the intelligent terminal to transmit a remote execution signal between the main control module and the data acquisition module, a control signal and a balance data signal, the main control module is used for receiving the remote execution signal sent by the intelligent terminal through the communication module and forming the remote execution signal into the control signal to control the balance 2 according to the control signal, and is used for receiving the balance data signal acquired by the data acquisition module through the communication module, and the balance data signal is subjected to data processing and is sent to the intelligent terminal in real time.
The communication mode of the main control module and the intelligent terminal comprises an APP remote network communication mode, a Wi-Fi communication mode or a Bluetooth communication mode, any one of the three modes can be adopted, and the communication mode is not limited in detail.
The intelligent terminal comprises at least one of a mobile phone 5, a notebook computer 4, a tablet or intelligent wearable equipment. In this embodiment, the intelligent terminal includes a mobile phone 5 and a notebook computer 4.
As shown in fig. 4, the present embodiment further provides a method for testing water absorption of recycled coarse aggregates, and the method for testing water absorption of recycled coarse aggregates includes the following steps:
s1, measuring the mass m of the dried regenerated coarse aggregate1。
Before measuring the mass of the dried regenerated coarse aggregate, 5000g of the regenerated coarse aggregate is taken, a square-hole sieve with the diameter of 4.75mm is adopted to filter the regenerated coarse aggregate, and impurities such as wood chips, plastics and the like are selected; and then cleaning the regenerated coarse aggregate with clear water, controlling the temperature in the oven to be a preset drying temperature, putting the cleaned regenerated coarse aggregate into the oven to be dried for a preset drying time, taking out the dried regenerated coarse aggregate, putting the dried regenerated coarse aggregate into a dryer to be cooled to room temperature, and then dividing the regenerated coarse aggregate into about 1000g by a four-part method to obtain the dried regenerated coarse aggregate.
In order to improve the accuracy of measurement, at least two parts of dried regenerated coarse aggregates are prepared and respectively subjected to water absorption test, and the average value of the water absorption of all the parts of regenerated coarse aggregates is taken as the average value of the regenerated coarse aggregates. This example illustrates the preparation of two portions of dry reclaimed coarse aggregate.
Accordingly, two baskets 1 and two balances 2 are provided, and to place the balances 2, a mounting frame 6 is assigned to each balance 2 for mounting the balance 2. Preferably, the balance 2 in this embodiment is a still water balance, the still water balance is in communication connection with the notebook computer 4 through a data line, specifically, one end of the data line is connected with the still water balance through a 232 interface, and the other end is connected with the notebook computer 4 through a USB interface. Every basket 1 hangs in balance 2 through the couple, makes things convenient for basket 1's dismantlement.
S2, placing the net basket 1 containing the regenerated coarse aggregate in water with a preset temperature to enable the regenerated coarse aggregate to stand still in the water for 1440min, and respectively collecting the mass M of the regenerated coarse aggregate in the water with the water absorption time length T and 1440minTAnd M1,0min＜T＜1440min。
Specifically, the preset temperature is 15-25 ℃, the water temperature in the water tank 3 is adjusted and kept within the range of 15-25 ℃, the net basket 1 is hung on the balance 2 through the hook, meanwhile, the net basket 1 is placed in the water tank 3, water is injected into the water tank 3 to the height of an overflow hole of the water tank 3, and the balance 2 is leveled. Dripping 1 ml-2 ml defoaming agent and stirring with a stirring rod.
Then taking out the basket 1, and putting all the dried regenerated coarse aggregates into the basket 1; then quickly putting the net basket 1 filled with the dried regenerated coarse aggregate into the water tank 3, quickly hanging the net basket 1 on the balance 2, and requiring that the time for the bottom of the net basket 1 to be wetted to finish hanging is less than or equal to 30 s.
In other embodiments, when testing the water absorption of at least two dry regenerated coarse aggregates, in order to reduce the difference of actions between different baskets 1 and shorten the time period from the bottom of the basket 1 to the completion of the suspension, a lifting unit, such as an air cylinder, an oil cylinder, a linear motor, etc., may be added, and the lifting unit drives one of the water tank 3 or the mounting bracket 6 to lift, so that the regenerated coarse aggregates in the basket 1 are immersed in the water, and the basket 1 does not need to be frequently suspended on the balance 2, or the basket 1 is taken off from the balance 2. Preferably, the water tub 3 is driven to be lifted and lowered by the lifting unit.
In this embodiment, one water tank 3 is associated with each basket 1. In other embodiments, a single sink 3 may be provided for both baskets 1 to reduce costs.
S3, taking out the regenerated coarse aggregate, wiping the regenerated coarse aggregate to a saturated dry-face state, and measuring the mass m of the regenerated coarse aggregate in the saturated dry-face state2。
Specifically, the regenerated coarse aggregate soaked for 1440min is taken out of the basket 1 and placed on a wringed wet towel, the regenerated coarse aggregate is wiped to be in a saturated face dry state, and the regenerated coarse aggregate in the saturated face dry state is weighed.
S4, calculating the water absorption W of the regenerated coarse aggregate when the water absorption time is TT=（MT+m2-m1-M1）/m1×100%。
In this embodiment, two portions of dry regenerated coarse aggregates are used, and the average value of the water absorption rates of the two portions of regenerated coarse aggregates is the water absorption rate of the regenerated coarse aggregates when the water absorption duration is T.
In this example, taking the measurement of the water absorption of the regenerated coarse aggregate at a water absorption time of 3min as an example, two portions of dried regenerated coarse aggregate reduced to about 1000g by the quartering method are prepared, and the detailed test data are as follows: the first part of dried regenerated coarse aggregate has the mass of 998.8g, the net basket 1 filled with the regenerated coarse aggregate is placed in the water tank 3 and hung on the balance 2 by using the hook, and the weight of collected regenerated coarse aggregate in water with the water absorption time of 3min is 617.3 g;the basket 1 is statically placed in water for 1440min, and the mass of the collected water for regenerating the coarse aggregate is 627.3g when the water absorption time is 1440 min; taking out the regenerated coarse aggregate from water, putting the regenerated coarse aggregate on a wringed wet towel, wiping the regenerated coarse aggregate to a saturated face dry state, and weighing 1049.6 g; calculating the water absorption rate, W, of the regenerated coarse aggregate when the water absorption time is 3minT=（617.3+1049.6-627.3-998.8）/998.8×100=4.08%。
The second part of dried regenerated coarse aggregate has the mass of 1001.0g, the basket 1 filled with the regenerated coarse aggregate is placed in the water tank 3 and hung on the balance 2 by using the hook, the mass of the collected regenerated coarse aggregate in water when the water absorption time is 3min is 610.9g, the basket 1 is statically placed in water for 1440min, and the mass of the collected regenerated coarse aggregate in water when the water absorption time is 1440min is 626.4 g; taking out the regenerated coarse aggregate from water, putting the regenerated coarse aggregate on a wringed wet towel, wiping the regenerated coarse aggregate to a saturated face dry state, and weighing 1057.0 g; calculating the water absorption rate, W, of the regenerated coarse aggregate when the water absorption time is 3minT=（610.9+1057.0-626.4-1001.0）/1001.0×100=4.05%。
Taking the arithmetic average of the two water absorptions, the water absorption of the regenerated coarse aggregate is (4.08% + 4.05%)/2 =4.07% when the water absorption duration is 3min, and then the water absorption of the regenerated coarse aggregate is 4.07% when the water absorption duration is 3 min.
By adopting the system for testing the water absorption of the regenerated coarse aggregate provided by the embodiment, the water absorption at any moment within 0-1440 min can be obtained by setting the water absorption duration T, the early water absorption of the regenerated coarse aggregate is accurately tested, particularly the water absorption 10min before the regenerated coarse aggregate is tested, and the influence of the regenerated coarse aggregate on the slump of cement concrete can be conveniently estimated.
In some embodiments, the water absorption time period T is collected according to a preset time sequenceiMass M in water of time-regenerated coarse aggregateTiI is an integer which is more than or equal to 1 and less than or equal to N, and N is the total times of measuring the mass of the regenerated coarse aggregate in water; the water absorption time is TiWater absorption W of recycled coarse aggregateTi=（MTi+m2-m1-M1）/m1X is 100%; t is T1To TN-1At any one time point of, TN＝1440min。
It should be noted that, in order to ensure the validity of the data, the collection of the water quality of the regenerated coarse aggregate is required to be automatically stopped after 1440 min. T is required to obtain the water absorption 10min before the regeneration of the coarse aggregate1Less than or equal to 10 min.
For the regenerated coarse aggregate, the water absorption amount per unit time of the regenerated coarse aggregate gradually decreases as the water absorption time length increases. In order to simplify the program operation and accurately obtain the water absorption of the regenerated coarse aggregates in each time stage, the preset time sequence is divided into at least two time stages, and in the two adjacent time stages, the time interval of the mass in the two adjacent times of collecting the regenerated coarse aggregates in the previous time stage is smaller than the time interval of the mass in the two adjacent times of collecting the regenerated coarse aggregates in the next time stage.
In order to reduce data redundancy, the time interval of the mass of the regenerated coarse aggregate water collected twice in each time phase is required to be integral multiple of 0.5 min.
By testing the water absorption rate at different time of each time stage, a relation curve between the water absorption rate and the water absorption duration can be accurately drawn.
In this embodiment, the preset time sequence is divided into four time stages according to the time sequence, wherein the time stages are respectively 0min to 10min, 10min to 20min, 20min to 60min and 60min to 1440min, and the performance of the regenerated coarse aggregate can be evaluated by utilizing the water absorption within 0min to 10 min.
And furthermore, the intelligent terminal is also used for inputting and displaying the time interval of collecting the water quality of the regenerated coarse aggregates at two adjacent times, displaying the water quality of the regenerated coarse aggregates in real time, and automatically displaying the relation curve between the water absorption rate of the regenerated coarse aggregates and the water absorption duration after the test is finished. The device is convenient to operate, realizes intellectualization of the test of the water absorption of the regenerated coarse aggregate, and is convenient to check relevant information and modify relevant parameters at any time.
Specifically, weigh the quality of dry regeneration coarse aggregate through balance 2, all install the APP procedure on notebook computer 4 and cell-phone 5, the software interface of APP procedure is equipped with the display frame that shows dry regeneration coarse aggregate quality, shows the display frame of the regeneration coarse aggregate quality of the dry state of saturated face, and shows the display frame of the adjacent two time interval of gathering regeneration coarse aggregate aquatic quality. In this embodiment, the display frames for displaying the time intervals of collecting the mass of the regenerated coarse aggregate in water for two adjacent times are four, each time stage corresponds to one display frame, the mass of the dry regenerated coarse aggregate and the mass of the regenerated coarse aggregate in a saturated dry state can be directly input into the corresponding display frame after being weighed, and the time intervals of collecting the mass of the regenerated coarse aggregate in water for two adjacent times in each time stage can be directly input into the corresponding display frame according to actual requirements.
Preferably, a clear key, a confirmation key and a display frame for displaying a relation curve between the water absorption rate of the regenerated coarse aggregate and the water absorption duration are arranged on a software interface of the APP program, the clear key is used for clearing data displayed in each display frame, and the confirmation key is used for confirming after corresponding data is input.
In the embodiment, the time interval of collecting the mass in the regenerated coarse aggregate water in two adjacent times within 0-10 min is 0.5min, the time interval of collecting the mass in the regenerated coarse aggregate water in two adjacent times within 10-20 min is 1min, the time interval of collecting the mass in the regenerated coarse aggregate water in two adjacent times within 20-60 min is 5min, and the time interval of collecting the mass in the regenerated coarse aggregate water in two adjacent times within 60-1440 min is 60 min.
Fig. 5 is a graph showing a relationship between water absorption duration and water absorption within 0min to 10min, which is obtained by using the method for testing water absorption of regenerated coarse aggregates provided in this embodiment, fig. 6 is a graph showing a relationship between water absorption duration and water absorption within 0min to 60min, which is obtained by using the method for testing water absorption of regenerated coarse aggregates provided in this embodiment, and fig. 7 is a graph showing a relationship between water absorption duration and water absorption within 0min to 1440min, which is obtained by using the method for testing water absorption of regenerated coarse aggregates provided in this embodiment.
Further, the controller further comprises a data storage module for storing the water absorption duration and the corresponding water absorption rate so as to facilitate later-stage calling. Table 1 is a data table of water absorption and water absorption duration in another embodiment of the present invention, in which the time interval between two adjacent times of collecting the mass in the regenerated coarse aggregate water within 0min to 10min is 0.5min, the time interval between two adjacent times of collecting the mass in the regenerated coarse aggregate water within 10min to 20min is 1min, the time interval between two adjacent times of collecting the mass in the regenerated coarse aggregate water within 20min to 60min is 5min, and the time interval between two adjacent times of collecting the mass in the regenerated coarse aggregate water within 60min to 1440min is 180 min.
TABLE 1 data sheet for water absorption and water absorption duration
The method for testing the water absorption of the regenerated coarse aggregate provided by the embodiment can realize uninterrupted testing from 0min to 1440min, obtain a relation curve between the water absorption of the regenerated coarse aggregate from 0min to 1440min and the water absorption duration, and accurately obtain a relation curve and detailed data between the water absorption of the regenerated coarse aggregate from 0min to 10min, which cannot be accurately measured by the existing aggregate water absorption testing method, so that a convenient way for testing the water absorption characteristics of the regenerated aggregate is provided for test researchers, and the early water absorption characteristics of different regenerated coarse aggregates are quantitatively evaluated and mastered by engineering technicians, thereby providing a possibility for predicting the working performance of concrete.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Wherein the terms "first position" and "second position" are two different positions.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Claims (4)
1. A method for testing the water absorption of regenerated coarse aggregates is characterized by comprising the following steps:
measuring the mass m of the dried reclaimed coarse aggregate1；
Placing the net basket (1) containing the regenerated coarse aggregate in water with a preset temperature to enable the regenerated coarse aggregate to stand still in the water for 1440min, and respectively collecting the mass M of the regenerated coarse aggregate in the water with the water absorption time length T and 1440minTAnd M1,0min＜T＜1440min；
Taking out the regenerated coarse aggregate, wiping the regenerated coarse aggregate to a saturated surface dry state, and measuring the mass m of the regenerated coarse aggregate in the saturated surface dry state2；
Calculating the water absorption W of the regenerated coarse aggregate when the water absorption time is TT=（MT+m2-m1-M1）/m1×100%；
Collecting water absorption time length T according to a preset time sequenceiMass M in water of time-regenerated coarse aggregateTiI is an integer which is more than or equal to 1 and less than or equal to N, and N is the total times of measuring the mass of the regenerated coarse aggregate in water;
the water absorption time is TiWater absorption W of recycled coarse aggregateTi=（MTi+m2-m1-M1）/m1X 100%, T is T1To TN-1At any one time point of, TN1440min, said T1≤10min。
2. A method for testing water absorption of reclaimed coarse aggregates according to claim 1, wherein the preset time sequence is divided into at least two time stages according to the time sequence, and the time interval between two adjacent reclaimed coarse aggregate water masses in the former time stage is smaller than the time interval between two adjacent reclaimed coarse aggregate water masses in the latter time stage.
3. The method for testing water absorption of regenerated coarse aggregates according to claim 2, characterized in that the preset time sequence is divided into four time stages according to the time sequence, and the time stages are respectively 0min to 10min, 10min to 20min, 20min to 60min and 60min to 1440 min.
4. The method for testing water absorption of reclaimed coarse aggregates according to claim 1, wherein the dried reclaimed coarse aggregates are in at least two portions;
the water absorption of the regenerated coarse aggregates when the water absorption duration is T is the average value of the water absorption of all the regenerated coarse aggregates when the water absorption duration is T.
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| CN211602783U (en) * | 2019-11-21 | 2020-09-29 | 中国水利水电科学研究院 | Grit aggregate saturated surface dry water absorption rate survey device |
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