CN107290246A - A kind of servicing unit and method for being used to determine concrete mix apparent density - Google Patents

Abstract

The invention provides an auxiliary device for measuring the apparent density of concrete mixture, which includes a central annular vertical compression plate whose inner diameter matches the diameter of the apparent density bucket, a peripheral annular vertical baffle, and a certain outward slope. The inclined circular plate is angularly connected between the central annular vertical pressing plate and the peripheral annular vertical baffle plate, and the bottom of the inclined circular plate is hinged symmetrically through a rebound device to clamp the surface The supporting rod on the outer peripheral wall of the density barrel, and the contact surface between the central annular vertical pressing plate and the apparent density barrel is also provided with a stretchable annular rubber ring. The invention also provides a method for measuring the apparent density of the concrete mixture. The invention has the characteristics of simple structure and convenient operation, and eliminates the waste caused by scraping the excess concrete mixture and the complicated steps caused by cleaning the wall of the apparent density barrel, ensuring the accuracy of the final test results .

Description

An auxiliary device and method for measuring the apparent density of concrete mixture

technical field

The invention belongs to the field of concrete property test experiments, in particular to an auxiliary device and method for measuring the apparent density of concrete mixture.

Background technique

The apparent density test of concrete mixture is widely used as one of the basic performance testing tests of ordinary concrete. At present, there are 5L containers used to measure the apparent density of concrete mixtures. According to the "Standards for Test Methods of Performance of Ordinary Concrete Mixtures" (GB 50080-2016), after adding concrete mixtures into the container and vibrating it for compaction, it is necessary to Scrape excess concrete mix off the surface. However, in the process of leveling, excess concrete mixture will adhere to and remain on the outer surface of the container. If it is not cleaned, it will have an impact on the final weighed quality, which in turn will greatly affect the accuracy of the apparent density result. However, cleaning the concrete mixture on the outer surface of the container increases the loss of manpower and material resources, which makes the process of the apparent density test more complicated. Therefore, be badly in need of a kind of auxiliary device that can hold and level the concrete mixture and use method thereof when measuring apparent density now.

Contents of the invention

SUMMARY OF THE INVENTION Aiming at the above-mentioned problems existing in the prior art, an auxiliary device and method for measuring the apparent density of concrete mixture are provided.

The auxiliary device of the present invention is realized through the following technical solutions:

An auxiliary device for measuring the apparent density of concrete mixtures, including a central annular vertical compression plate whose inner diameter matches the diameter of the apparent density barrel, a peripheral annular vertical baffle, and connected outwards at a certain angle An inclined ring plate between the central annular vertical pressure plate and the peripheral annular vertical baffle plate, the bottom of the inclined ring plate is symmetrically hinged by a rebound device and is provided for clamping the outer circumference of the apparent density barrel The supporting rod of the wall, and a stretchable annular rubber ring is also arranged between the contact surface of the central annular vertical pressing plate and the apparent density bucket.

Further, the support rod is in the shape of a door, and is hinged to the bottom of the inclined circular plate through two rebound devices.

Further, the support rod is T-shaped, and is hinged to the bottom of the inclined circular plate through a rebound device.

Further, the support rod is I-shaped, and is hinged to the bottom of the inclined circular plate through two rebound devices.

Further, the contact portion between the support rod and the outer peripheral wall of the apparent density barrel is arc-shaped.

Further, the curvature of the contact portion matches the curvature of the outer peripheral wall of the apparent density barrel.

Further, the angle formed by the inclined circular plate and the central circular vertical pressure plate is 45°-75°.

Further, the materials of the central annular vertical pressing plate, the peripheral annular vertical baffle, the inclined annular plate and the support rod are all metal.

Using method of the present invention is realized through following technical scheme:

A method for determining the apparent density of concrete mixtures, based on the auxiliary device as described, comprising the steps of:

₁ ) weigh the mass m of the apparent density bucket;

2) Put the stretchable rubber ring on the wall opening of the outer barrel of the apparent density barrel;

3) Pull apart the two support rods of the auxiliary device, and move the auxiliary device downwards so that the upper surface of the central circular vertical compression plate is flush with the upper surface of the edge of the apparent density barrel;

4) Loosen the support rod so that it clamps the outer wall of the apparent density barrel under the action of the spring return force to prevent the auxiliary device from falling;

5) Fill the apparent density bucket with the concrete mixture once (machine vibrating) or twice (manually inserting and tamping), so that there is a little surplus, and use manual or mechanical methods for tamping;

6) After tamping or vibrating, scrape the excess concrete mixture from the edge of the apparent density bucket into the auxiliary device to make the surface of the concrete mixture smooth, then pull the support rod, and slowly lift the auxiliary device to make it consistent with the apparent density. density bucket separation;

7) Remove the rubber ring and weigh the apparent density bucket and the mass _m2 of the concrete mixture. The apparent density of the concrete mixture is calculated according to the following formula:

ρ=1000(m ₂ -m ₁ )/V

In the formula:

ρ--apparent density of concrete mixture (kg/m ³ ),

V--apparent density barrel volume (L),

m ₂ -- mass of apparent density bucket and concrete mixture (kg),

m ₁ -- the apparent density barrel mass (kg).

Further, in the step 4),

When the manual tamping method is used for tamping, the concrete mixture is divided into two layers and put into the apparent density bucket, and each layer is tamped evenly from the edge to the center with a tamping rod for at least 25 times. Tap the rubber hammer along the outer wall of the container for 5 to 10 times. If the concrete mixture sinks below the barrel mouth during the second layer of tamping, add concrete mixture at any time;

When the mechanical vibration method is used for tamping, the concrete mixture is filled with the apparent density bucket together with the auxiliary device and vibrated on the vibration table for at least 10s. If the concrete mixture sinks below the mouth of the bucket during the vibration process, it should be Add concrete mix as you go.

The invention has the characteristics of simple structure and convenient operation, and eliminates the waste caused by scraping the excess concrete mixture and the complicated steps caused by cleaning the wall of the apparent density barrel, ensuring the accuracy of the final test result .

Description of drawings

Fig. 1 is a top view of an auxiliary device according to Embodiment 1 of the present invention.

Fig. 2 is a bottom view of the auxiliary device according to Embodiment 1 of the present invention.

Fig. 3 is a schematic diagram of the structure of the support rod according to the second embodiment of the present invention.

Fig. 4 is a schematic diagram of the structure of the supporting rod according to the third embodiment of the present invention.

Fig. 5 is a schematic diagram of the auxiliary device according to Embodiment 1 of the present invention when it is placed on the apparent density barrel.

In the figure: 1. Central circular vertical compression plate, 2. Inclined circular plate, 3. Peripheral circular vertical baffle, 4. Rebound device, 5. Support rod, 6. Rubber ring.

detailed description

The purpose of the invention of the present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, and the embodiments cannot be repeated here one by one, but the implementation of the present invention is not therefore limited to the following embodiments.

Embodiment one

As shown in Figures 1 to 2, an auxiliary device for measuring the apparent density of concrete mixtures includes a central annular vertical compression plate 1 whose inner diameter matches the diameter of the apparent density bucket, and a peripheral annular vertical The baffle plate 3, the inclined circular ring plate 2 connected outwardly at a certain angle between the central annular vertical compression plate 1 and the peripheral annular vertical baffle plate 3, the bottom of the inclined circular ring plate 2 passes through the back The elastic device 4 is symmetrically hinged and provided with a support rod 5 for clamping the outer peripheral wall of the apparent density barrel, and a telescopic annular ring is also arranged between the contact surface of the central annular vertical pressing plate 1 and the apparent density barrel. Rubber ring6.

The support rod 5 is in the shape of a door, and is hinged to the bottom of the inclined circular plate 2 through two rebound devices 4, and the distance between the centers of the two rebound devices 4 is 130 mm. The contact portion between the support rod 5 and the outer peripheral wall of the apparent density barrel is arc-shaped, and at the same time, the radian of the contact portion matches the arc of the outer peripheral wall of the apparent density barrel to increase the contact area and improve the stability of the clamping .

When not in use, the left and right support rods 5 will be compressed by the rebound device 4 to be in the closed state shown in Figures 1 and 2. The rebound device 4 generally includes a hinge pair and a torsion spring.

In this embodiment, the expanded size of the central circular vertical compression plate 1 is 596 mm (length)×20 mm (width)×2 mm (thickness).

The diameter (inner diameter) of the circle surrounded by the central annular vertical pressure plate 1 is 189 mm.

The dimension of the inclined ring plate 2 after unfolding is 973mm (outer side length)×596mm (inner side length)×60mm (width)×2mm (thickness).

The acute angle between the inclined circular plate 2 and the central circular vertical pressure plate 1 is 75°.

The expanded size of the peripheral annular vertical baffle 3 is 973mm (length)×40mm (width)×2mm (thickness).

The diameter of the support rod 5 is 5 mm, and the total length is 380 mm, wherein the contact part between the support rod 5 and the barrel wall is arc-shaped when in use. The materials of the auxiliary device are all metal.

The rubber ring 6 can expand and contract within a certain range without damage, and its size is determined by the flexibility of the rubber.

Embodiment two

As shown in Figure 3, the difference between this embodiment and Embodiment 1 is that the support rod 5 is T-shaped and hinged to the bottom of the inclined circular plate 2 through a rebound device 4, which has a simple structure and is easy to install. .

Embodiment three

As shown in FIG. 4 , the difference between this embodiment and Embodiment 1 is that the support rod 5 is I-shaped, and is hinged to the bottom of the inclined circular plate 2 through two rebound devices 4 .

Embodiment four

A method for measuring the apparent density of concrete mixture, based on the auxiliary device as described in embodiment one, comprising steps:

₁ ) weigh the mass m of the apparent density bucket;

2) Put the stretchable rubber ring 6 on the outer barrel wall of the apparent density barrel;

3) Pull apart the two support rods 5 of the auxiliary device, and move the auxiliary device downwards so that the upper surface of the central annular vertical compression plate 1 is flush with the upper surface of the edge mouth of the apparent density barrel;

4) Loosen the support rod 5 so that it clamps the outer wall of the apparent density barrel under the action of the spring return force to prevent the auxiliary device from falling;

5) Fill the apparent density bucket with the concrete mixture once (machine vibrating) or twice (manually inserting and tamping), so that there is a little surplus, and use manual or mechanical methods for tamping;

6) After tamping or vibrating, scrape the excess concrete mixture at the edge of the apparent density bucket into the auxiliary device to make the surface of the concrete mixture smooth, and the scraped concrete mixture will follow the inclined ring plate 2 Slide down and be blocked by the peripheral annular vertical baffle 3, then pull the support rod 5, and slowly lift the auxiliary device to separate it from the apparent density bucket;

7) Remove the rubber ring 6 and weigh the apparent density bucket and the mass _m2 of the concrete mixture. The apparent density of the concrete mixture is calculated according to the following formula:

ρ=1000(m ₂ -m ₁ )/V

In the formula:

ρ--apparent density of concrete mixture (kg/m ³ ),

V--apparent density barrel volume (L),

m ₂ -- mass of apparent density bucket and concrete mixture (kg),

m ₁ -- the apparent density barrel mass (kg).

Specifically, in the step 4),

When the manual tamping method is used for tamping, the concrete mixture is divided into two layers and put into the apparent density bucket, and each layer is tamped evenly from the edge to the center with a tamping rod for at least 25 times. Tap the rubber hammer along the outer wall of the container for 5 to 10 times. If the concrete mixture sinks below the barrel mouth during the second layer of tamping, add concrete mixture at any time;

When the mechanical vibration method is used for tamping, the concrete mixture is filled with the apparent density bucket together with the auxiliary device and vibrated on the vibration table for at least 10s. If the concrete mixture sinks below the mouth of the bucket during the vibration process, it should be Add concrete mix as you go.

The above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, rather than limiting the implementation of the present invention. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. All modifications, equivalent replacements and improvements made within the spirit and principles of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (10)

1. An auxiliary device for measuring the apparent density of concrete mixture, characterized in that: comprise a central annular vertical compression plate (1) whose inner diameter matches the diameter of the apparent density bucket, a peripheral annular vertical retaining plate Plate (3), an inclined circular ring plate (2) connected outwardly at a certain angle between the central annular vertical pressing plate (1) and the peripheral annular vertical baffle (3), the inclined circular The bottom of the ring plate (2) is symmetrically hinged with a support rod (5) for clamping the outer peripheral wall of the apparent density barrel through a rebound device (4), and the central annular vertical pressing plate (1) is connected with the surface A stretchable annular rubber ring (6) is also arranged between the contact surfaces of the bulk density bucket. 2. a kind of auxiliary device for measuring concrete mixture apparent density according to claim 1, it is characterized in that: described support bar (5) is gate shape, by two rebounding devices (4) Hinged on the bottom of the inclined ring plate (2). 3. a kind of auxiliary device for measuring concrete mixture apparent density according to claim 1, it is characterized in that: described support rod (5) is T-shaped, is hinged by a rebound device (4) At the bottom of the inclined ring plate (2). 4. a kind of auxiliary device for measuring concrete mixture apparent density according to claim 1, it is characterized in that: described support bar (5) is I-shaped, by two springback devices (4) Hinged on the bottom of the inclined ring plate (2). 5. a kind of auxiliary device for measuring the apparent density of concrete mixture according to any one of claims 1 to 4, it is characterized in that: described support bar (5) and apparent density barrel peripheral wall The contact portion is arc-shaped. 6. a kind of auxiliary device for measuring concrete mixture apparent density according to claim 5, is characterized in that: the radian of described contact portion matches with the radian of apparent density barrel peripheral wall. 7. a kind of auxiliary device for measuring the apparent density of concrete mixture according to claim 1, is characterized in that: described inclined circular plate (2) and central circular vertical compression plate angle are 45°～75°. 8. A kind of auxiliary device for measuring concrete mixture apparent density according to claim 1, it is characterized in that: described central annular vertical compression plate (1), peripheral annular vertical baffle plate ( 3), the material of inclined ring plate (2), support bar (5) is metal. 9. A method for measuring the apparent density of concrete mixture, based on the auxiliary device according to any one of claims 1 to 8, characterized in that, comprising the steps: ₁ ) weigh the mass m of the apparent density bucket; 2) Put the stretchable rubber ring (6) on the outer barrel wall of the apparent density barrel; 3) Pull apart the two support rods (5) of the auxiliary device, and move the auxiliary device downwards so that the upper surface of the central annular vertical pressure plate (1) is flush with the upper surface of the edge of the apparent density barrel; 4) Loosen the support rod (5) so that it clamps the outer wall of the apparent density barrel under the action of the spring return force to prevent the auxiliary device from falling; 5) Fill the apparent density bucket with the concrete mixture once or twice, so that there is a little surplus, and compact it manually or mechanically; 6) After tamping or vibrating, scrape the excess concrete mixture at the edge of the apparent density bucket into the auxiliary device to make the surface of the concrete mixture smooth, then pull the support rod (5) and slowly lift the auxiliary device to make it separated from the apparent density bucket; 7) Remove the rubber ring (6) and weigh the apparent density bucket and the mass _m2 of the concrete mixture. The apparent density of the concrete mixture is calculated according to the following formula: ρ=1000(m ₂ -m ₁ )/V In the formula: ρ--apparent density of concrete mixture (kg/m ³ ), V--apparent density barrel volume (L), m ₂ -- mass of apparent density bucket and concrete mixture (kg), m ₁ -- the apparent density barrel mass (kg). 10. The method according to claim 9, characterized in that: in the step 4), When the manual tamping method is used for tamping, the concrete mixture is divided into two layers and put into the apparent density bucket, and each layer is tamped evenly from the edge to the center with a tamping rod for at least 25 times. Tap the rubber hammer along the outer wall of the container for 5 to 10 times. If the concrete mixture sinks below the barrel mouth during the second layer of tamping, add concrete mixture at any time; When the mechanical vibration method is used for tamping, the concrete mixture is filled with the apparent density bucket together with the auxiliary device and vibrated on the vibration table for at least 10s. If the concrete mixture sinks below the mouth of the bucket during the vibration process, it should be Add concrete mix as you go.