1. The utility model provides a quick detection device of aggregate moisture content, its characterized in that includes drum (1), sets up water hole (2) of crossing of drum (1) side, install cross elbow (3) of water hole (2) department, set up and be in drum (1) outer wall and with hyaline tube (4) that elbow (3) are linked together and be used for storing the terminal equipment who calculates the data that detect, the equipartition has scale mark (5) on hyaline tube (4), the axial of hyaline tube (4) with the axial direction parallel of drum (1), drum (1) with between elbow (3) with be sealing connection between hyaline tube (4).

2. The device for rapidly detecting the moisture content of the aggregates is characterized in that a level bubble (6) is arranged on the outer wall of the cylinder (1), and the level bubble (6) is perpendicular to the axial direction of the cylinder (1).

3. The rapid detection device for the moisture content of the aggregates according to claim 2, characterized in that a plurality of adjusting bolts (7) are arranged at the bottom end of the cylinder (1), and the plurality of adjusting bolts (7) are uniformly distributed at the bottom end of the cylinder (1).

4. The rapid detection device for the moisture content of the aggregates according to claim 1, characterized in that the cylinder (1) and the elbow (3) are made of stainless steel, and the minimum division value of the scale marks (5) on the transparent tube (4) is 0.5 mm.

5. The detection method of the rapid detection device for the moisture content of the aggregates according to any one of claims 1 to 4 is characterized by comprising the following steps:

s1: installing a detection device, leveling and checking the installed detection device, and controlling the temperature of a laboratory to be 20 +/-5 ℃;

s2: clean water is injected into the cylinder (1) of the detection device to ensure that the water level reaches the position of 0.0 scale mark (5) of the transparent tube (4), and the scale a of the water level is accurately observed and recorded₁(ii) a Measuring the temperature of the water body in the cylinder (1), and finding out the density rho of the water body under the temperature of the water body_w；

S3: in routine sampling inspection of raw material approach, the apparent density ρ and the saturation surface dry water absorption α of the batch of aggregates are measured₁Selecting a bone material sample from the sampled aggregate, weighing and sealing to obtain the mass G of the aggregate sample;

s4: slowly putting the weighed aggregate into a cylinder (1) of a detection device, and ensuring that water cannot splash to the outside of the cylinder (1) in the putting process;

s5: a stainless steel rod is inserted into the cylinder (1) to stir the aggregate repeatedly until no bubble is generated in the water; the water in the cylinder (1) is ensured not to splash to the outside of the cylinder (1) in the stirring process; after stirring is finished, returning water attached to the stainless steel bar and the inner wall of the cylinder (1) to the water at the bottom of the cylinder (1);

s6: recording the water level scale a after stirring and water level stabilization₂And recording the temperature of the water body at the moment;

s7: according to the scale a of the water level in S2₁And water level scale a in S6₂Calculating the volume V of the rising water surface in the cylinder (1);

s8: according to the apparent density rho of the aggregate, the mass G of the aggregate sample and the aggregate sampleThe sum V of the volume of the pure sand and the volume of the contained water and the density rho of the water body_wCalculating the moisture content m of the aggregate sample based on the dry aggregate₁；

S9: according to the water content m based on the dry aggregate in S8₁And saturated surface dry water absorption alpha₁Calculating the water content m based on the saturated surface dry aggregate₂；

S10: saturated surface dry water absorption alpha based on dry aggregate₁Calculating the saturated surface dry water absorption alpha based on the saturated surface dry aggregate₂；

S11: water content m based on dry aggregate of saturated surface₂And a saturated surface dry water absorption rate alpha based on the saturated surface dry aggregate₂Calculating the surface water content m of the aggregate_s；

S12: and carrying out error analysis on the detected aggregate moisture content.

6. The method as claimed in claim 5, wherein a calculation program is preset in the terminal device, the detection data in the above steps are input to the terminal device, and the terminal device automatically calculates the required data.

7. The method for detecting the moisture content of the aggregates according to claim 6, wherein m is calculated when the moisture content of the aggregates sample based on the dry aggregates is calculated in step S8₁Then, the equation is established according to the volume equivalence relation as follows:

Gm₁/[ρ_w(1+m₁)]+G/[ρ(1+m₁)]＝V；

the water content based on the dry aggregate was determined as follows:

m₁＝(V-G/ρ)/(G/ρ_w-V)。

8. the method for detecting the moisture content of the aggregate according to claim 6, wherein the moisture content m based on the saturated surface dry aggregate is calculated in step S9₂Then, the calculation is performed according to the following formula:

m₂＝m₁/(1+α₁)。

9. the method as claimed in claim 6, wherein the step S10 is performed by calculating the saturation surface dry water absorption rate α based on the saturation surface dry aggregate₂Then, the following formula is adopted for calculation:

α₂＝α₁/(1+α₁)。

10. the method for detecting the moisture content of the aggregate according to claim 6, wherein the moisture content m on the surface of the aggregate is calculated in step S11_sThen, the following formula is adopted for calculation:

m_s＝m₂-α₂

i.e. m_s＝m₁/(1+α₁)-α₁/(1+α₁)

m_s＝(m₁-α₁)/(1+α₁)。

Background

The concrete is a building base material which is prepared by mixing sand and stone as aggregate, cement and water according to a certain proportion. The existing concrete mixing plant generally comprises an aggregate proportioning machine, a mixing main machine, a finished product conveyor and a finished product bin. The aggregate moisture content is one of the key factors influencing the concrete quality, and the final over-dilution of the concrete is caused by the excessive aggregate moisture content, so that technical personnel need to know the moisture content condition of the aggregate in real time so as to conveniently configure the concrete meeting the standard. The water content of the engineering site sandstone aggregate is inevitably fluctuated greatly, and the water content is directly related to the water-cement ratio, so that the quality of a concrete finished product is greatly influenced. However, in the existing aggregate moisture content detection, most of the existing aggregate moisture content detection methods adopt indirect measurement methods of microwaves, electromagnetism and the like, the operation is complicated, the time consumption is too long, the detection error is large, meanwhile, in the detection process, the loss of water of a sample is large, the detection accuracy is low, the reliable reference cannot be provided, the precision of the online moisture content detection method in the current market is limited, the precision of the instruments is converted into the influence on the water consumption precision of each concrete, and the regulation that the water weighing error is less than or equal to 1% is generally exceeded.

Disclosure of Invention

In order to solve the technical problems, the invention provides a rapid detection device and a detection method for aggregate water content.

The technical scheme for solving the technical problems is as follows: the utility model provides a quick detection device of aggregate moisture content, includes the drum, set up the water hole of crossing in the drum side, install the elbow of crossing water hole department, set up at the drum outer wall and the hyaline tube that is linked together with the elbow and be used for storing the terminal equipment who calculates the data that detect, the equipartition has the scale mark on the hyaline tube, the axial of hyaline tube is parallel with the axial of drum, be sealing connection between drum and the elbow, between elbow and the hyaline tube.

Furthermore, the outer wall of the cylinder is provided with a level bubble which is vertical to the axial direction of the cylinder.

Further, the bottom of drum is provided with a plurality of adjusting bolt, and a plurality of adjusting bolt equipartitions are in the bottom of drum.

Furthermore, the cylinder and the elbow are both made of stainless steel, and the minimum division value of the scale marks on the transparent tube is 0.5 mm.

The invention also provides a detection method of the rapid detection device adopting the aggregate moisture content, which comprises the following steps:

s1: installing a detection device, leveling and checking the installed detection device, and controlling the temperature of a laboratory to be 20 +/-5 ℃;

s2: clean water is injected into a cylinder of the detection device, so that the water surface reaches the position of 0.0 graduation line of the transparent pipe, and the graduation a of the water surface is accurately observed and recorded₁(ii) a Measuring the temperature of the water in the cylinder and finding out the density rho of the water at the temperature_w；

S3: in routine sampling inspection of raw material approach, the apparent density ρ and the saturation surface dry water absorption α of the batch of aggregates are measured₁Selecting a bone material sample from the sampled aggregate, weighing and sealing to obtain the mass G of the aggregate sample;

s4: slowly putting the weighed aggregate into a cylinder of a detection device, and ensuring that water cannot splash to the outside of the cylinder in the putting process;

s5: a stainless steel rod is used for extending into the cylinder to repeatedly stir the aggregate until no bubbles are generated in the water; the water in the cylinder is ensured not to splash to the outside of the cylinder in the stirring process; after stirring is finished, water attached to the stainless steel bar and the inner wall of the cylinder flows back to the water at the bottom of the cylinder;

s6: recording the water level scale a after stirring and water level stabilization₂And recordThe temperature of the water body at this time;

s7: according to the scale a of the water level in S2₁And water level scale a in S6₂Calculating the volume V of the water surface rising in the cylinder;

s8: according to the apparent density rho of the aggregate, the mass G of the aggregate sample, the sum V of the volume of pure sand and the volume of contained water in the aggregate sample and the density rho of the water body_wCalculating the moisture content m of the aggregate sample based on the dry aggregate₁；

S9: according to the water content m based on the dry aggregate in S8₁And saturated surface dry water absorption alpha₁Calculating the water content m based on the saturated surface dry aggregate₂；

S10: saturated surface dry water absorption alpha based on dry aggregate₁Calculating the saturated surface dry water absorption alpha based on the saturated surface dry aggregate₂；

S11: water content m based on dry aggregate of saturated surface₂And a saturated surface dry water absorption rate alpha based on the saturated surface dry aggregate₂Calculating the surface water content m of the aggregate_s；

S12: and carrying out error analysis on the detected aggregate moisture content.

Furthermore, a calculation program is preset in the terminal device, the detection data in each step is input into the terminal device, and the terminal device automatically calculates the required data.

Further, in step S8, m is calculated when the aggregate sample has a moisture content based on dry aggregate₁Then, the equation is established according to the volume equivalence relation as follows:

Gm₁/[ρ_w(1+m₁)]+G/[ρ(1+m₁)]＝V；

the water content based on the dry aggregate was determined as follows:

m₁＝(V-G/ρ)/(G/ρ_w-V)。

further, in step S9, the moisture content m based on the saturated surface dry aggregate is calculated₂Then, the calculation is performed according to the following formula:

m₂＝m₁/(1+α₁)

further, in step S10, the saturation surface dry water absorption α based on the saturation surface dry aggregate is calculated₂Then, the following formula is adopted for calculation:

α₂＝α₁/(1+α₁)

further, in step S11, the aggregate surface moisture content m is calculated_sThen, the following formula is adopted for calculation:

m_s＝m₂-α₂

i.e. m_s＝m₁/(1+α₁)-α₁/(1+α₁)

m_s＝(m₁-α₁)/(1+α₁)

Compared with the prior art, the invention has the following beneficial effects: the rapid detection device and the detection method for the aggregate moisture content provided by the invention have the advantages that the detection device is simple and reliable in structure and good in use performance, and can accurately detect the change of the water quantity in the cylinder to form a reliable water quantity volume detection assembly, so that a reliable basis is provided for the subsequent detection of the aggregate moisture content; in addition, the detection method is simpler and quicker, the method is based on a volume displacement method, the moisture content of the aggregate is directly measured, the calibration process of a detection instrument is omitted, the error accumulation in the detection process is avoided, meanwhile, the loss of the moisture of the aggregate sample is relatively reduced in the process from the sampling of the aggregate to the test, the accuracy of the detection result of the moisture content of the aggregate is effectively improved, and the detection reliability is high.

Drawings

FIG. 1 is a schematic view of a detecting device according to the present invention;

FIG. 2 is a schematic view of the cylinder after water injection and addition of an aggregate sample in the cylinder according to the present invention;

FIG. 3 is a temperature and density comparison table of a water body in the present invention;

the reference numerals shown in fig. 1 to 3 are respectively expressed as: 1-cylinder, 2-water through hole, 3-elbow, 4-transparent tube, 5-graduation line, 6-level bubble and 7-adjusting bolt.

Detailed Description

The principles and features of this invention are described below in conjunction with the following drawings, which are set forth by way of illustration only and are not intended to limit the scope of the invention.

As shown in fig. 1-2, a rapid detection device for aggregate moisture content comprises a cylinder 1, a water passing hole 2 formed in the side surface of the cylinder 1, an elbow 3 installed at the water passing hole 2, a transparent tube 4 arranged on the outer wall of the cylinder 1 and communicated with the elbow 3, and a terminal device used for storing and calculating detected data, wherein scale marks 5 are uniformly distributed on the transparent tube 4, and the cylinder 1 and the elbow 3, and the elbow 3 and the transparent tube 4 are in sealing connection.

The volume change of water before and after the sample is placed can be accurately measured by the detection device; discharging air among aggregate particles in the aggregate sample by using water; measuring the volume sum of pure aggregate and contained moisture in the aggregate sample by using the volume change of water; the moisture content of the aggregate was calculated. The cylinder 1 is used for containing water, and the inner wall of the cylinder is a smooth round surface, so that water liquid adsorbed on the inner wall of the cylinder 1 can flow back into the cylinder 1. The cylinder 1 and the elbow 3 are made of stainless steel materials, so that the influence on detection precision caused by corrosion in a long-time detection process is avoided, and the service life is prolonged. The cylinder 1 is 480mm high, 180mm in inner diameter and 3mm in wall thickness. The graduation lines 5 on the transparent tube 4 are used for detecting the position of the water body, so that a worker can accurately observe the water amount in the cylinder 1, the inner diameter of the transparent tube 4 is 20mm, and the minimum division value of the graduation lines 5 is 0.5 mm.

The outer wall of the cylinder 1 is provided with a level bubble 6, and the level bubble 6 is perpendicular to the axial direction of the cylinder 1. The position of the bubble in the vial 6 determines whether the cylinder 1 is in a level condition, the centered condition of the vial 6 being the condition in which the axis of the cylinder 1 is vertical.

The bottom of drum 1 is provided with a plurality of adjusting bolt 7, and a plurality of adjusting bolt 7 equipartitions are in the bottom of drum 1. Preferably, three adjusting bolts 7 are used, and the leveling bolts are rotated to adjust the height position of the cylinder 1, so that the level bubble 6 is in a centered state, and the device is ensured to be in a leveling state.

The invention also provides a detection method of the rapid detection device adopting the aggregate moisture content, which comprises the following steps:

s1: and installing a detection device, leveling and checking the installed detection device, and controlling the temperature of the laboratory to be 20 +/-5 ℃. When the detection device is leveled, the leveling operation is completed by adjusting the height of the adjusting bolt 7 to enable the leveling bubble 6 to be in a centered state.

S2: injecting clear water into the cylinder 1 of the detection device to enable the water surface to reach the position of the 0.0 scale mark 5 of the transparent tube 4, and accurately observing and recording the scale a of the water surface₁(ii) a Measuring the temperature of the water in the cylinder 1, and finding out the water density rho under the water temperature according to the comparison table shown in figure 3_w。

S3: in routine sampling inspection of raw material approach, the apparent density ρ and the saturation surface dry water absorption α of the batch of aggregates are measured₁And selecting a bone material sample from the sampled bone materials, weighing and sealing to obtain the mass G of the bone material sample.

S4: slowly putting the weighed aggregate into the cylinder 1 of the detection device, and ensuring that water cannot splash to the outside of the cylinder 1 in the putting process.

S5: a stainless steel rod is used for extending into the cylinder 1 to stir the aggregate repeatedly until no bubble is generated in the water; the water in the cylinder 1 is ensured not to splash to the outside of the cylinder 1 in the stirring process; when the stirring is completed, the water attached to the stainless steel rod and the inner wall of the cylinder 1 is returned to the water at the bottom of the cylinder 1.

S6: recording the water level scale a after stirring and water level stabilization₂And recording the temperature of the water body at the moment.

S7: according to the scale a of the water level in S2₁And water level scale a in S6₂The volume V of the water level rise in the cylinder 1 is calculated. The formula for calculating the volume V of the water surface rise is as follows: v3.14159 × (0.9)²+0.1²)×(a₂-a₁)×10^-2＝0.025761(a₂-a₁) L in units of volume.

S8: according to the apparent density rho of the aggregate, the mass G of the aggregate sample, the sum V of the volume of pure sand and the volume of contained water in the aggregate sample and the density rho of the water body_wCalculating the moisture content m of the aggregate sample based on the dry aggregate₁。

In the step, m is calculated when the moisture content of the aggregate sample based on dry aggregate is taken as a reference₁Then, the equation is established according to the volume equivalence relation as follows:

Gm₁/[ρ_w(1+m₁)]+G/[ρ(1+m₁)]＝V；

the water content based on the dry aggregate was determined as follows:

m₁＝(V-G/ρ)/(G/ρ_w-V)。

s9: according to the water content m based on the dry aggregate in S8₁And saturated surface dry water absorption alpha₁Calculating the water content m based on the saturated surface dry aggregate₂。

In this step, the moisture content m based on the saturated surface dry aggregate is calculated₂Then, the calculation is performed according to the following formula:

m₂＝m₁/(1+α₁)。

s10: saturated surface dry water absorption alpha based on dry aggregate₁Calculating the saturated surface dry water absorption alpha based on the saturated surface dry aggregate₂。

In the step, the saturated surface dry water absorption alpha based on the saturated surface dry aggregate is calculated₂Then, the following formula is adopted for calculation:

α₂＝α₁/(1+α₁)

s11: water content m based on dry aggregate of saturated surface₂And a saturated surface dry water absorption rate alpha based on the saturated surface dry aggregate₂Calculating the surface water content m of the aggregate_s。

In the step, the surface moisture content m of the aggregate is calculated_sThen, the following formula is adopted for calculation:

m_s＝m₂-α₂

i.e. m_s＝m₁/(1+α₁)-α₁/(1+α₁)

m_s＝(m₁-α₁)/(1+α₁)

S12: and carrying out error analysis on the detected aggregate moisture content. All the above calculations can be completed in the terminal device. And presetting a calculation program in the terminal equipment, inputting the detection data in each step into the terminal equipment, and automatically calculating the required data through the terminal equipment. The terminal equipment adopts a computer.

When the error analysis is carried out on the detection result in the step, as the minimum division value of the scale of the detector is 0.5mm, the reading error is less than 0.25mm, and the error V caused by the sum of the volume of the pure sand and the volume of the contained water is less than: 3.14159X 0.25X (0.9)²+0.1²)×10^-2＝6.44×10^-2(L); the water content of the sand used for mixing the concrete is generally about 3 percent, and the influence of the error on the water content detection result is calculated according to three conditions of 2 percent, 3 percent and 4 percent of real water content respectively.

The first embodiment is as follows: for true water cut m₁For 2% sand, if the apparent density of the sand is 2.7g/cm³The density of water is measured as 0.998g/cm at 20 deg.C³And (4) calculating, wherein the true value of the sum V of the volume of the pure sand and the volume of the contained water is as follows: 10/[2.7 × (1+ 2%)]+10×2％[0.998×(1+2％)]3.8276 (L); if the reading error is 6.44X 10^-3(L), whereby the calculated moisture content value is: m is₁′＝(v′-G/ρ)/(G/ρ_w-V)＝(3.8276+0.00644-10/2.7)/(10/0.998-3.8276-0.00644)＝0.021＝2％。m′-m₁2.1% -2% ═ 0.1%. Because the maximum value of reading error does not exceed + 6.44X 10^-3(L), therefore, the error of the water content calculated by the above method does not exceed 0.1%.

If the reading error is-6.44X 10^-3(L), whereby the calculated moisture content value is: m is₁′＝(v′-G/ρ)/(G/ρ_w-V)＝(3.8276-0.00644-10/2.7)/(10/0.998-3.8276+0.00644)＝0.019＝1.9％。m′-m₁1.9% -2% — 0.1%, since the minimum value of the reading error does not exceed-6.44 × 10^-3(L), therefore, the absolute value of the error of the water content calculated thereby does not exceed 0.1%.

Example two:for true water cut m₁For 3% sand, if the apparent density of the sand is 2.7g/cm³The density of water is measured as 0.998g/cm at 20 deg.C³And (4) calculating, wherein the true value of the sum V of the volume of the pure sand and the volume of the contained water is as follows: 10/[2.7 × (1+ 3%)]+10×3％[0.998×(1+3％)]＝3.8877(L)；

If the reading error is + 6.44X 10^-3(L), whereby the calculated moisture content value is: m is₁′＝(v′-G/ρ)/(G/ρ_w-V)＝(3.8877+0.00644-10/2.7)/(10/0.998-3.8276-0.00644)＝0.031＝3.1％。m′-m₁3.1% -3% ═ 0.1%, since the maximum value of the reading error does not exceed +6.44 × 10^-3(L), therefore, the error of the water content calculated by the above method does not exceed 0.1%.

If the reading error is-6.44X 10^-3(L), whereby the calculated moisture content value is: m is₁′＝(v′-G/ρ)/(G/ρ_w-V)＝(3.8877-0.00644-10/2.7)/(10/0.998-3.8276+0.00644)＝0.029＝2.9％，m′-m₁2.9% -3% — 0.1%. Because the minimum value of reading error does not exceed-6.44X 10^-3(L), therefore, the absolute value of the error of the water content calculated thereby does not exceed 0.1%.

Example three: for true water cut m₁For 4% sand, if the apparent density of the sand is 2.7g/cm³The density of water is measured as 0.998g/cm at 20 deg.C³And (4) calculating, wherein the true value of the sum V of the volume of the pure sand and the volume of the contained water is as follows: 10/[2.7 × (1+ 4%)]+10×4％[0.998×(1+4％)]＝3.9466(L)；

If the reading error is + 6.44X 10^-3(L), whereby the calculated moisture content value is: m is₁′＝(v′-G/ρ)/(G/ρ_w-V)＝(3.9466+0.00644-10/2.7)/(10/0.998-3.9466-0.00644)＝0.041＝4.1％。m′-m₁4.1% -4%, 0.1%. Because the maximum value of reading error does not exceed +6.44 x cm³(L), therefore, the error of the water content calculated by the above method does not exceed 0.1%.

If the reading error is-6.44X 10^-3(L), whereby the calculated moisture content value is: m is₁′＝(v′-G/ρ)/(G/ρ_w-V)＝(3.9466-0.00644-10/2.7)/(10/0.998-3.9466+0.00644)＝0.039＝3.9％。m′-m₁3.9% -4% — 0.1%. Because the minimum value of reading error does not exceed-6.44X 10^-3(L), therefore, the absolute value of the error of the water content calculated thereby does not exceed 0.1%.

Through the calculation in the first to third embodiments, it can be seen that, under the three conditions that the real water content is 2%, 3% and 4%, the influence of the reading error of the detector on the detection result of the water content is within 0.1%. The aggregate moisture content detected by the method has high accuracy.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.