CN212228523U - Test device capable of automatically preparing specific saturation test piece - Google Patents
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Abstract
A test device capable of automatically preparing a test piece with specific saturation comprises: the test box is used for carrying out saturation test on a test piece placed in the test cavity; the humidity control unit comprises a humidity sensor, a humidifier, a humidity controller and a water tank and is used for controlling the humidity in the test chamber; the temperature control unit comprises a temperature sensor, an electric heating tube and a temperature controller and is used for controlling the temperature in the test cavity; the quality detection unit comprises a test base and a quality sensor and is used for transmitting a quality signal arranged on the test base to the saturation control unit; and the saturation control unit comprises a data processor and a signal converter and is used for controlling the temperature and the humidity in the test box and measuring the quality change of the test piece at the same time. The utility model has the advantages that: the concrete sample with the specific saturation can be prepared according to the requirements of scientific researchers.
Description
Technical Field
The utility model belongs to concrete test piece preparation field, concretely relates to test device that can prepare specific saturation test piece automatically.
Background
Migration processes such as permeation, capillary absorption and the like of harmful ions and other media in the environment where the concrete material is located in the material are closely related to the deterioration of the durability of the concrete material. The transport of harmful ions requires the liquid water present in the pores to migrate. The research on the migration of moisture is particularly important for the analysis of durability, when the water saturation is higher, harmful gases are difficult to migrate to the interior of a concrete material under the barrier effect of liquid water, and ions are easy to be transmitted like the interior of the concrete by virtue of more moisture-filled pores. Therefore, the mechanism process of the concrete durability deterioration is greatly influenced by the service environment, and the influence rule of the material durability is different under the environment with different water saturation.
In scientific research experiments, if a scientific researcher wants to test a concrete sample with a certain specific water saturation, the concrete sample with the specific water saturation is very difficult to prepare. However, no complete method is available for preparing concrete samples with specific saturation so far, and the problems of labor waste, low precision and uneven water distribution generally exist. Therefore, a relatively complete automatic method for preparing concrete test pieces with specific saturation is urgently needed.
The method for preparing concrete test pieces with different water saturation at present comprises the following steps: the concrete test piece is saturated by water, and then is put into a constant-temperature oven at 60 ℃ for baking, so that the concrete test piece is partially dehydrated to reach different water saturation degrees. However, this method has several major disadvantages: 1. the concrete sample is heated unevenly inside and outside, so that the water saturation inside and outside the concrete sample is inconsistent. 2. The concrete test piece needs to be taken out manually every several hours for weighing, so that the time and the labor are consumed, and the test piece is influenced when the concrete test piece is taken out.
Chinese patent publication No. CN 105115793 a, published on day 02/12/2015 entitled "a method for rapidly preparing samples of different water saturations" is a novel practical problem of rapidly preparing samples of different water saturations, but has the following problems: 1. the problem of how to accurately obtain a concrete test piece with a specific saturation degree is not solved, and the test piece with a specific saturation degree which is required by scientific research personnel cannot be met. 2. When test pieces with different water saturation degrees are prepared, the test pieces are required to be taken out every 12 hours and weighed, the influence on the test pieces is inevitable in the taking-out process, and the time and the labor are consumed.
Disclosure of Invention
An object of the utility model is to provide a can prepare test device of specific saturation test piece automatically, the concrete test piece moisture content of preparation distributes evenly to need not to take out the test piece at preparation test piece in-process and weigh labour saving and time saving.
In order to realize the purpose of the utility model, the utility model adopts the following technical scheme:
the utility model provides a can prepare test device of specific saturation test piece automatically which characterized in that includes:
the test box comprises a box body shell of the test box, at least one test cavity is arranged in the inner cavity of the box body, and the test box is used for carrying out saturation test on a test piece placed in the test cavity;
the humidity control unit comprises a humidity sensor, a humidifier, a humidity controller and a water tank, the humidity sensor is arranged in the test cavity, and a signal transmission port of the humidity sensor is electrically connected with a signal input port of the saturation control unit and used for transmitting a humidity signal in the test cavity to the saturation control unit; the humidifier is hung on the top of the test chamber, a water inlet of the humidifier is communicated with a water outlet pipeline of the humidity controller, and a water inlet of the humidity controller is communicated with a water outlet pipeline of the water tank; the signal input end of the humidity controller is electrically connected with the humidity signal output port of the saturation control unit and is used for controlling the humidity in the test cavity;
the temperature control unit comprises a temperature sensor, an electric heating tube and a temperature controller, wherein the temperature sensor is arranged in the test cavity, and a signal transmission port of the temperature sensor is electrically connected with a signal input port of the saturation control unit and used for transmitting the detected temperature data in the test cavity to the saturation control unit; the signal output port of the temperature controller is electrically connected with the control port of the electric heating tube and is used for sending an instruction to the electric heating tube to control the electric heating tube to work; the signal input port of the temperature controller is electrically connected with the temperature signal output port of the saturation control unit and is used for transmitting temperature data to the saturation control unit or receiving a command of the saturation control unit and feeding back the temperature data to the electric heating tube so as to control the temperature in the test cavity;
the quality detection unit comprises a test base and a quality sensor, wherein the quality sensor is arranged between the test base and the bottom plate of the test cavity, and a signal transmission end of the quality sensor is electrically connected with a corresponding signal input end of the saturation control unit and is used for transmitting a quality signal arranged on the test base to the saturation control unit;
and the saturation control unit comprises a data processor and a signal converter, wherein the data processor is in signal connection with the humidity sensor, the temperature sensor and the quality sensor through the signal converter and is used for controlling the temperature and the humidity in the test box so as to control the saturation of the test piece.
The shell of the box body is of a sandwich structure and is divided into three layers, wherein the inner layer is made of stainless steel, the middle layer is made of heat insulation material, and the outermost layer is made of stainless steel; the heat insulation material is filled in the gap between the stainless steel plates.
The inner cavity of the box body is of a multi-layer structure from top to bottom, and the layers are isolated by stainless steel plates; the humidity installation base for installing the humidifier is arranged in the middle of the top of each layer of the box body, the humidifying head capable of atomizing water is arranged at the water outlet of the lower end of the humidifier, the humidifier is connected with the humidity installation base, the water inlet of the humidifier is communicated with one end of the water pipe through the humidity installation base, and the other end of the water pipe extends out of the test box and is communicated with the water outlet of the humidity controller.
The bottom middle position of every layer of box is equipped with a sensor base, install a humidity transducer and temperature sensor on the sensor base, and the center of sensor base with humidifier position projection coincidence, sensor base passes through bolted connection with the stainless steel board between the layer.
The left side wall and the right side wall of the box body are respectively provided with a buckle for fixing the electric heating tube; the electric heating tubes are uniformly distributed on the left side and the right side of the box body structure and are connected with the temperature controller through electric wires; the left side and the right side of the electric heating tube are respectively arranged on the left side wall and the right side wall of the box body through buckles.
A plurality of discs for placing test pieces are arranged on each layer of test cavity bottom plate, and an upward convex separation blade is arranged on the outer ring of each disc; and a mass sensor is arranged below the disc, and the upper end and the lower end of the mass sensor are respectively connected with the disc and the mounting base.
Four support legs are arranged at the bottom of the test box.
The signal converter comprises a temperature signal converter, a humidity signal converter and a quality signal converter, wherein:
the signal input end of the temperature signal converter is connected with the signal output end of the temperature sensor, and the signal output end of the temperature signal converter is electrically connected with the signal input end of the data processor and used for converting the temperature signal into an electric signal and transmitting the electric signal to the data processor;
the signal input end of the humidity signal converter is connected with the signal output end of the humidity sensor, and the signal output end of the humidity signal converter is electrically connected with the signal input end of the data processor and used for converting the humidity signal into an electric signal and transmitting the electric signal to the data processor;
the signal input end of the quality signal converter is connected with the signal output end of the quality sensor, and the signal output end of the quality signal converter is electrically connected with the signal input end of the data processor and used for converting the quality signal into an electric signal and transmitting the electric signal to the data processor.
According to the utility model discloses an automatic preparation specific saturation test piece's test device's measuring method, its characterized in that, including following step:
1) preparing a test piece in an early stage: firstly, preparing concrete, pouring the prepared concrete into a PVC pipe die, and placing the PVC pipe die into a concrete curing chamber for curing; cutting the concrete test piece after the maintenance is finished to prepare a test piece to be prepared;
2) placing the cut test piece to be prepared into water to be saturated, taking out the concrete test piece after the test piece is saturated, wiping the surface moisture, placing the concrete test piece on a mass sensor in a test box for weighing, and recording the mass as m1；
3) Adjusting the temperature of the test box, closing the box door of the test box at the moment, drying the concrete sample after the temperature in the box rises until the quality of the concrete sample is stable and does not fall any more, and recording the quality of the concrete sample at the moment to be m2(ii) a At the moment, the adjustable humidifier starts to work; increasing the humidity from 0%, maintaining the current humidity after increasing a certain amount of humidity, and continuing to increase the humidity after waiting for the test piece to absorb water until the mass is constant;
4) the formula for calculating the water saturation of the concrete is as follows:
wherein m is1The mass (g) of the concrete sample after the concrete sample is saturated by water; m is2The mass (g) of the concrete specimen in a dried state; m ishTarget mass (g) required to be achieved for a certain concrete mix ratio;
if a concrete test piece with the target water saturation of a% needs to be prepared, the target mass of the concrete test piece to be prepared can be calculated through the formula as follows:
mh＝(m1-m2)×a％+m2 (2)；
5) the humidity of the test box is controlled by a humidity controller, the mass of the concrete test piece is increased due to water absorption, and the mass of the concrete in the preparation process of the reading mass sensor is mi；
When m isi＜mhWhen the water absorption capacity of the concrete test piece is increased, the humidity controller controls the humidifier to continuously increase the humidity so as to increase the water absorption capacity of the concrete test piece;
when m isi＞mhWhen the water absorption amount of the concrete test piece is reduced, the humidity controller controls the humidifier to continuously reduce the humidity so as to reduce the water absorption amount of the concrete test piece;
when in use
When the current humidity is maintained, the humidity controller controls the humidifier to maintain the current humidity, and the obtained test piece can be considered as a target test piece with water saturation of a%;
6) after the test is finished, taking out the prepared test piece, wrapping the test piece by using aluminum foil paper, and winding by using transparent adhesive tape to prevent water from losing;
wherein, in the step 3), when the mass of the test piece is continuously measured for a plurality of times at the same time interval, the quality is considered to be stable when the deviation range of the mass is within 0.03 g.
If the test piece is cuboid concrete, the side length of the bottom surface of the test piece can be adjusted at will between 0 and 106mm, and the height can be adjusted at will between 0 and 150 mm; if the test concrete test piece is a cylindrical test piece, the diameter of the bottom surface of the test piece can be adjusted randomly between 0mm and 150mm, and the height of the test piece can be adjusted randomly between 0mm and 150 mm.
The utility model discloses according to the balanced principle of the gas-liquid of solution, put into the environment of certain humidity with the test piece in the middle of, moisture in the test piece and moisture in the middle of the environment can reach a balanced state, and then make the moisture saturation of concrete test piece rise or reduce, when the humidity of invariable environment, the saturation of concrete will tend to the stability after a period, and then this concrete saturation under the current ambient humidity has been obtained.
The utility model discloses a control environment humidity adjusts the moisture saturation of concrete sample through humidity, compares the tradition like this and forces moisture to scatter and disappear through toasting, and the sample moisture distribution that this method made is even, and the moisture saturation is accurate high.
The utility model discloses characteristics: 1. automation: the concrete test piece does not need to be taken out at intervals manually to measure the weight, time and labor are saved, the influence on the concrete when the concrete is taken out and weighed is avoided, and the influence on the preparation of the test piece caused by human factors is reduced to the maximum extent. 2. Specific saturation test pieces can be prepared: concrete samples with specific saturation can be prepared according to the requirements of scientific research personnel. Compared with some conventional preparation methods, the method reasonably solves the problem of preparing the concrete test block with specific saturation required by the experiment, and greatly helps scientific research.
Drawings
Fig. 1 is a schematic view of the present invention.
FIG. 2 is a structural frame diagram of the present invention;
FIG. 3 is a front cross-sectional view of the test chamber of the present invention;
FIG. 4 is a side cross-sectional view of the test chamber of the present invention;
fig. 5 is a partial schematic view of the test chamber housing of the present invention;
FIG. 6 is a schematic view of the temperature and humidity sensor of the present invention;
fig. 7 is a schematic view of the humidifier of the present invention;
fig. 8 is a concrete placing and checking diagram of the present invention.
Detailed Description
The present invention will be further described with reference to the accompanying drawings.
With reference to the accompanying drawings:
embodiment 1 a but test device of automatic preparation specific saturation test piece, include:
the test box comprises a box body shell of the test box, at least one test cavity is arranged in the inner cavity of the box body, and the test box is used for carrying out saturation test on a test piece placed in the test cavity;
the humidity control unit comprises a humidity sensor 9, a humidifier 13, a humidity controller 18 and a water tank 17, wherein the humidity sensor 9 is arranged in the test chamber, and a signal transmission port of the humidity sensor 9 is electrically connected with a corresponding signal input port of the signal converter and used for transmitting a humidity signal in the test chamber to the saturation control unit; the humidifier 13 is hung on the top of the test chamber, the water inlet of the humidifier is communicated with the water outlet pipeline of the humidity controller 18, and the water inlet of the humidity controller 18 is communicated with the water outlet pipeline of the water tank 17; the signal input end of the humidity controller 18 is electrically connected with the humidity signal transmission port of the data processor 20 of the saturation control unit, and the humidity signal in the test chamber is transmitted to the humidity signal converter, then to the data processor and then to the humidity controller so as to control the humidity in the test chamber;
the temperature control unit comprises a temperature sensor 8, an electrothermal tube 1 and a temperature controller 19, wherein the temperature sensor 8 is arranged in the test cavity, and a signal transmission port of the temperature sensor 8 is electrically connected with a corresponding signal input port of the signal converter and is used for transmitting the detected temperature data in the test cavity to the saturation control unit; the control port of the temperature controller 19 is electrically connected with the control port of the electric heating tube 1 and is used for sending an instruction to the electric heating tube 1 to control the electric heating tube 1 to work; the signal input port of the temperature controller 19 is electrically connected with the temperature signal transmission port of the data processor 20 of the saturation control unit, and is used for transmitting temperature data to the saturation control unit or receiving a command of the saturation control unit and feeding back the temperature data to the electric heating tube so as to control the temperature in the test cavity;
the quality detection unit comprises a test base 5 and a quality sensor 25, wherein the quality sensor 25 is arranged between the test base and the bottom plate of the test cavity, and a signal transmission end of the quality sensor 25 is electrically connected with a corresponding signal input end of the saturation control unit and is used for transmitting a quality signal arranged on the test base to the saturation control unit; wherein the test cavity bottom plate refers to an interlayer stainless steel plate;
and the saturation control unit comprises a data processor 20 and a signal converter, wherein the data processor is in signal connection with the humidity sensor 9, the temperature sensor 8 and the quality sensor 25 through the signal converter and is used for measuring the temperature and humidity change in the test cavity so as to control the saturation of the test piece.
The signal converter comprises a temperature signal converter 14, a humidity signal converter 15 and a quality signal converter 16, wherein:
the signal input end of the temperature signal converter 14 is connected with the signal output end of the temperature sensor, and the signal output end of the temperature signal converter 14 is electrically connected with the signal input end of the data processor 20, and is used for converting the temperature signal into an electric signal and transmitting the electric signal to the data processor;
the signal input end of the humidity signal converter 15 is connected with the signal output end of the humidity sensor, and the signal output end of the humidity signal converter 15 is electrically connected with the signal input end of the data processor 20 and used for converting the humidity signal into an electric signal and transmitting the electric signal to the data processor;
the signal input end of the quality signal converter 16 is connected with the signal output end of the quality sensor 25, and the signal output end of the quality signal converter 16 is electrically connected with the signal input end of the data processor 20, and is used for converting the quality signal into an electric signal and transmitting the electric signal to the data processor.
The shell of the box body is of a sandwich structure and is divided into three layers, wherein the inner layer 10 is made of stainless steel, the middle layer 11 is made of heat insulation material, and the outermost layer 12 is made of stainless steel; the heat insulation material is filled in the gap between the stainless steel plates.
The inner cavity of the box body is of a multi-layer structure from top to bottom, and the layers are isolated by a stainless steel plate 26; the humidity installation base 23 used for installing the humidifier is arranged in the middle of the top of each layer of the box body, the humidifying head 24 capable of atomizing water is arranged at the water outlet of the lower end of the humidifier 13, the humidifier is connected with the humidity installation base 23, the water inlet of the humidifier 13 is communicated with one end of the water pipe 27 through the humidity installation base 23, and the other end of the water pipe 27 extends to the outside of the test box and is communicated with the water outlet of the humidity controller 18.
The bottom middle position of each layer of box is equipped with a sensor base 7, install a humidity transducer 9 and temperature sensor 8 on the sensor base 7, and the center of sensor base 7 with humidifier 13 position projection coincidence, sensor base 7 passes through bolted connection with interlaminar stainless steel 26.
The left side wall and the right side wall of the box body are respectively provided with a buckle 21 for fixing the electric heating tube 1; the electric heating tubes 1 are uniformly distributed on the left side and the right side of the box body structure, and the electric heating tubes 1 are connected with the temperature controller 19 through electric wires; the left side and the right side of the electric heating tube 1 are respectively arranged on the left side wall and the right side wall of the box body through buckles 21.
A plurality of discs 4 for placing test pieces are arranged on each layer of test cavity bottom plate, and the outer ring of each disc 4 is provided with a baffle plate 3 protruding upwards; a mass sensor 25 is arranged below the disc, and the upper end and the lower end of the mass sensor 25 are respectively connected with the disc 4 and the mass sensor base 5.
The bottom of the test chamber is provided with four support legs 6.
The inner cavity of the test box body is divided into four layers, and each layer is used as an independent test cavity; the layers are separated by stainless steel plates 26. The top middle position of each layer of test chamber is equipped with a humidifier 13, the humidifier lower extreme is equipped with one and can be with the water atomizing humidification head 24, the humidifier links to each other with humidity installation base 23, humidifier 13 is linked together through humidity installation base 23 and the one end of water pipe 27, water pipe 27 is made by the stainless steel, and the other end extends outside the proof box all the time with humidity controller 18 links to each other.
The bottom middle position of each layer of test chamber of box is equipped with a humidity transducer 9 and temperature sensor 8 respectively, and humidity transducer 9 and temperature sensor 8 are fixed on sensor base 7 simultaneously, the center of sensor base 7 with humidifier 13 position projection coincidence, sensor base 7 and interlaminar corrosion resistant plate 26 pass through bolted connection.
The left side wall and the right side wall of the box body are respectively provided with an electric heating tube 1, the electric heating tubes 1 are uniformly distributed on the left side and the right side of the box body structure, and the electric heating tubes 1 are electrically connected with the temperature controller 19 through cables. The left side and the right side of the electric heating tube 1 are respectively provided with a stainless steel buckle 21, and the electric heating tube 1 is connected with the inner side wall of the box body through the buckles 21.
Every layer of test chamber all is equipped with four discs 4 of placing cylindrical concrete test piece 2, the disc is made for stainless steel to the diameter of disc 4 is 150mm, the outer lane of disc is equipped with the bellied separation blade 3 that makes progress. A test piece 2 of concrete is placed centrally in the disc 4. A mass sensor 25 is arranged below the disc, and the upper end and the lower end of the mass sensor 25 are respectively connected with the disc 4 and the mass sensor base 5.
The box body shell of the test box is of a sandwich type and is divided into three layers. The inner layer 10 is made of stainless steel, the middle layer 11 is made of heat insulation material, and the outermost layer 12 is made of stainless steel. The heat insulation material fills the gaps among the stainless steel plates, and no gap is left.
The signal converter comprises a temperature signal converter 14, a humidity signal converter 15 and a quality signal converter 16. The function of the temperature signal converter 14 is to convert the temperature signal of the concrete sample 2 measured by the temperature sensor 8 in the test chamber into an electrical signal and further to transmit the electrical signal to the data processor 20. The function of the humidity signal converter 15 is to convert the quality signal of the concrete specimen 2 measured by the humidity sensor 9 in the test chamber into an electrical signal and further to transmit the electrical signal to the data processor 20. The function of the mass signal converter 16 is to convert the mass signal of the concrete specimen 2 measured by the mass sensor 25 in the test chamber into an electrical signal and further to transmit the electrical signal to the data processor 20.
The temperature controller 19 is connected with the electric heating tube 1 in the test box, and adjusts the temperature in the box body through temperature feedback information given by the data processor 20. Wherein one end of the humidity controller 18 is connected with the humidifier 13 in the test box, the other end is connected with the water tank 17, and the humidity in the box body is adjusted through temperature feedback information given by the data processor 20.
The concrete sample 2 can be a cuboid, the side length of the bottom surface can be adjusted at will between 0 and 106mm, and the height can be adjusted at will between 0 and 150 mm; if the test concrete test piece is a cylindrical test piece, the diameter of the bottom surface can be adjusted randomly between 0mm and 150mm, and the height can be adjusted randomly between 0mm and 150 mm.
The bottom of the test box is provided with four support legs 6.
The test boxes are all made of 304 stainless steel.
Embodiment 3 a measuring method of a test apparatus for automatically preparing a test piece of a specific saturation according to embodiment 1, comprising the steps of:
1) preparing a test piece in an early stage: firstly, preparing concrete, pouring the prepared concrete into a PVC pipe die with the diameter of 105mm, and putting the PVC pipe die into a concrete curing chamber for curing for 28 days; cutting the concrete test piece after the maintenance is finished to prepare a test piece to be prepared, wherein the diameter of the test piece is 105mm, and the height of the test piece is 20 mm;
2) saturating the cut test piece to be prepared in water, taking out the concrete test piece after the test piece is saturated, wiping the surface moisture, putting the concrete test piece on a mass sensor in a multifunctional preparation box for weighing, and recording the mass as m1；
3) Adjusting the temperature of the multifunctional preparation box to 60 ℃, closing the box door of the test box at the moment, drying the concrete sample after the temperature in the box rises until the quality of the concrete sample is stable and does not fall any more, and recording that the mass of the concrete sample at the moment is m2(ii) a At the moment, the adjustable humidifier starts to work; increasing the humidity from 0%, maintaining the current humidity after increasing a certain amount of humidity, and continuing to increase the humidity after waiting for the test piece to absorb water until the mass is constant;
4) the formula for calculating the water saturation of the concrete is as follows:
wherein m is1The mass of the concrete test piece after being saturated with water is g; m is2G, the mass of the concrete sample in a drying state; m ishG, the target mass required to be achieved by a certain concrete mixing ratio;
if a concrete test piece with the target water saturation of a% needs to be prepared, the target mass of the concrete test piece to be prepared can be calculated through the formula as follows:
mh＝(m1-m2)×a％+m2 (2)；
5) by controlling the humidity of the test chamber, the concrete sample can be increased in mass due to water absorption, and the mass of the concrete in the preparation process on the reading mass sensor is mi；
When m isi＜mhWhen the water absorption capacity of the concrete test piece is increased, the humidity controller controls the humidifier to continuously increase the humidity so as to increase the water absorption capacity of the concrete test piece;
when m isi＞mhWhen the water absorption amount of the concrete test piece is reduced, the humidity controller controls the humidifier to continuously reduce the humidity so as to reduce the water absorption amount of the concrete test piece;
when in use
When the current humidity is maintained, the humidity controller controls the humidifier to maintain the current humidity, and the obtained test piece can be considered as a target test piece with water saturation of a%;
6) after the test is finished, taking out the prepared test piece, wrapping the test piece by using aluminum foil paper, and winding by using transparent adhesive tape to prevent water from losing;
wherein, in the step 3), when the mass of the test piece is continuously measured for 3 times at the same time interval, the quality is considered to be stable when the deviation range of the mass is within 0.03 g.
The temperature of the oven is adjusted to 60 ℃ so as to avoid damage to the microscopic structure of the test piece to be prepared due to overhigh temperature and reduce experimental errors.
The test piece is cuboid concrete, the side length of the bottom surface can be adjusted randomly between 0mm and 106mm, and the height can be adjusted randomly between 0mm and 150 mm; if the test concrete test piece is a cylindrical test piece, the diameter of the bottom surface can be adjusted randomly between 0mm and 150mm, and the height can be adjusted randomly between 0mm and 150 mm.
Example 4 this example is followed by the preparation of test specimens having a water saturation of 60% using as an example the proportioned concrete test pieces as described in table 1 below, and further illustrates the invention.
Table 1 concrete test piece composition table:
the concrete test blocks are manufactured according to the mixing proportion of the concrete in the table 1, after 28 days of maintenance in a standard curing room, a cylindrical concrete with the diameter of 50mm is drilled by a drilling and core-drilling machine, and the concrete is cut into a cylinder with the diameter of 50mm and the height of 50mm by a cutting machine to be used for preparing test pieces.
Saturating the cut test piece to be prepared in water, taking out the concrete test piece after the test piece is saturated, wiping the surface moisture, putting the concrete test piece on a mass sensor in a multifunctional preparation box for weighing, and recording the mass as m by a data processor1＝109.93g。
The temperature of the multifunctional preparation box is adjusted to be 60 ℃, the box door of the test box is closed at the moment, the concrete sample is dried after the temperature in the box rises, and until the quality of the concrete sample is stable and does not fall, the data processor records that the quality of the concrete sample at the moment is m2＝100.37g。
The formula for calculating the water saturation of the concrete is as follows:
according to the formula (1), the mass m to be achieved for the concrete specimen with a water saturation of 60% is to be preparedh＝(m1-m2)×a％+m2＝106.1g。
At this time, the data processor controls the adjustable humidifier to start working. Humidity increased from 0%. And after a certain amount of humidity is increased, maintaining the current humidity, and continuing to increase the humidity after the test piece absorbs water until the quality is constant.
The mass m of the cylindrical concrete test piece can be recorded in real time by a mass sensor in the test boxi。
To 60% water contentAfter the concrete sample of saturation is prepared, checking that the current concrete quality is mi106.05 g. According to the discrimination condition, the quality satisfies the formula:
namely, the obtained concrete sample is the concrete sample with the water saturation of 60 percent.
The door of the test box is opened by an experimenter, the prepared test piece is taken out, the test block is wrapped by the aluminum foil paper, and the transparent adhesive tape is wound to prevent the water from losing.
The temperature of the oven is adjusted to 60 ℃ so as to avoid damage to the microscopic structure of the test piece to be prepared due to overhigh temperature and reduce experimental errors.
When the corresponding test piece is prepared, the concrete test piece does not need to be taken out at intervals manually to measure the weight, so that time and labor are saved, the influence on the concrete when the concrete is taken out and weighed is avoided, and the influence on the preparation of the test piece caused by human factors is reduced to the maximum extent; and 60% specific saturation test pieces required by the experiment can be prepared, and the reasonability and the help of the experiment are great.
When specifically realizing, the utility model discloses do not restrict specific device model, as long as can accomplish the components and parts of above-mentioned function all can.
The embodiments described in this specification are merely illustrative of implementations of the inventive concepts, and the scope of the invention should not be considered limited to the specific forms set forth in the embodiments, but rather the scope of the invention includes equivalent technical means that can be conceived by those skilled in the art based on the inventive concepts.
Claims (8)
1. The utility model provides a can prepare test device of specific saturation test piece automatically which characterized in that includes:
the test box comprises a box body shell of the test box, at least one test cavity is arranged in the inner cavity of the box body, and the test box is used for carrying out saturation test on a test piece placed in the test cavity;
the humidity control unit comprises a humidity sensor, a humidifier, a humidity controller and a water tank, the humidity sensor is arranged in the test cavity, and a signal transmission port of the humidity sensor is electrically connected with a signal input port of the saturation control unit and used for transmitting a humidity signal in the test cavity to the saturation control unit; the humidifier is hung on the top of the test chamber, a water inlet of the humidifier is communicated with a water outlet pipeline of the humidity controller, and a water inlet of the humidity controller is communicated with a water outlet pipeline of the water tank; the signal input end of the humidity controller is electrically connected with the humidity signal output port of the saturation control unit and is used for controlling the humidity in the test cavity;
the temperature control unit comprises a temperature sensor, an electric heating tube and a temperature controller, wherein the temperature sensor is arranged in the test cavity, and a signal transmission port of the temperature sensor is electrically connected with a signal input port of the saturation control unit and used for transmitting the detected temperature data in the test cavity to the saturation control unit; the signal output port of the temperature controller is electrically connected with the control port of the electric heating tube and is used for sending an instruction to the electric heating tube to control the electric heating tube to work; the signal input port of the temperature controller is electrically connected with the temperature signal output port of the saturation control unit and is used for transmitting temperature data to the saturation control unit or receiving a command of the saturation control unit and feeding back the temperature data to the electric heating tube so as to control the temperature in the test cavity;
the quality detection unit comprises a test base and a quality sensor, wherein the quality sensor is arranged between the test base and the bottom plate of the test cavity, and a signal transmission end of the quality sensor is electrically connected with a corresponding signal input end of the saturation control unit and is used for transmitting a quality signal arranged on the test base to the saturation control unit;
and the saturation control unit comprises a data processor and a signal converter, wherein the data processor is in signal connection with the humidity sensor, the temperature sensor and the quality sensor through the signal converter and is used for controlling the temperature and the humidity in the test box so as to control the saturation of the test piece.
2. The test device for automatically preparing the test piece with the specific saturation as claimed in claim 1, wherein: the shell of the box body is of a sandwich structure and is divided into three layers, wherein the inner layer is made of stainless steel, the middle layer is made of heat insulation material, and the outermost layer is made of stainless steel; the heat insulation material is filled in the gap between the stainless steel plates.
3. The test device for automatically preparing the test piece with the specific saturation as claimed in claim 2, wherein: the inner cavity of the box body is of a multi-layer structure from top to bottom, and the layers are isolated by stainless steel plates; the top intermediate position of every layer of box is equipped with a humidity installation base that is used for installing the humidifier, humidifier lower extreme delivery port is equipped with one and can be with the atomizing humidification head of water, the humidifier links to each other with humidity installation base, and the water inlet of humidifier is linked together through the one end of humidity installation base with the water pipe, the other end of water pipe extend to the multifunctional test case outside always with humidity controller's delivery port is linked together.
4. A test apparatus for automatically preparing a specimen of a specific saturation according to claim 3, wherein: the bottom middle position of every layer of box is equipped with a sensor base, install a humidity transducer and temperature sensor on the sensor base, and the center of sensor base with humidifier position projection coincidence, sensor base and layer stainless steel baffle pass through bolted connection.
5. The test device for automatically preparing the test piece with the specific saturation as set forth in claim 4, wherein: the left side wall and the right side wall of the box body are respectively provided with a buckle for fixing the electric heating tube; the electric heating tubes are uniformly distributed on the left side and the right side of the box body structure and are connected with the temperature controller through electric wires; the left side and the right side of the electric heating tube are respectively arranged on the left side wall and the right side wall of the box body through buckles.
6. A test apparatus for automatically preparing a specimen of a specific saturation according to claim 3, wherein: a plurality of discs for placing test pieces are arranged on each layer of test cavity bottom plate, and an upward convex separation blade is arranged on the outer ring of each disc; and a mass sensor is arranged below the disc, and the upper end and the lower end of the mass sensor are respectively connected with the disc and the mounting base.
7. The test device for automatically preparing the test piece with the specific saturation as claimed in claim 1, wherein: the signal converter comprises a temperature signal converter, a humidity signal converter and a quality signal converter, wherein:
the signal input end of the temperature signal converter is connected with the signal output end of the temperature sensor, and the signal output end of the temperature signal converter is electrically connected with the signal input end of the data processor and used for converting the temperature signal into an electric signal and transmitting the electric signal to the data processor;
the signal input end of the humidity signal converter is connected with the signal output end of the humidity sensor, and the signal output end of the humidity signal converter is electrically connected with the signal input end of the data processor and used for converting the humidity signal into an electric signal and transmitting the electric signal to the data processor;
the signal input end of the quality signal converter is connected with the signal output end of the quality sensor, and the signal output end of the quality signal converter is electrically connected with the signal input end of the data processor and used for converting the quality signal into an electric signal and transmitting the electric signal to the data processor.
8. A test apparatus for automatically preparing a specimen of a specific saturation according to claim 3, wherein: four support legs are arranged at the bottom of the test box.
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| CN202020231569.XU CN212228523U (en) | 2020-02-28 | 2020-02-28 | Test device capable of automatically preparing specific saturation test piece |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111337320A (en) * | 2020-02-28 | 2020-06-26 | 浙江工业大学 | Test device and test method capable of automatically preparing specific saturation test piece |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111337320A (en) * | 2020-02-28 | 2020-06-26 | 浙江工业大学 | Test device and test method capable of automatically preparing specific saturation test piece |
| CN111337320B (en) * | 2020-02-28 | 2024-06-11 | 浙江工业大学 | Test device and test method capable of automatically preparing test piece with specific saturation |
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