CN108237615A - A kind of pervious concrete preparation system and its forming method - Google Patents

Abstract

The invention discloses a preparation system and a preparation method of permeable concrete. The invention belongs to the technical field of preparation and performance improvement of permeable concrete. The preparation system includes: forming device, compacting device and demoulding device. The molding device is used for forming permeable concrete, the compacting device is used for compacting pervious concrete, and the demoulding device is used for demoulding of permeable concrete. The preparation method includes the use of the preparation system and the adjustment of compaction times and compaction height, so that the comprehensive performance of the permeable concrete test block is improved. Beneficial effects of the present invention: the forming method and preparation system not only overcome the shortcomings of traditional forming methods (vibration, inserting and pounding, static pressure), improve the strength of permeable concrete, but also make the laboratory forming of permeable concrete have quantitative standards, and also provide On-site construction provides technical and data support, thereby optimizing the on-site construction process and improving the applicability and versatility of permeable concrete.

Description

A kind of permeable concrete preparation system and forming method thereof

technical field

The invention relates to the technical field of permeable concrete, in particular to a permeable concrete preparation system and molding method.

Background technique

At present, cities are mostly covered by reinforced concrete, and the road surface has poor water permeability and air permeability. Rainwater cannot penetrate into the ground in time, resulting in waterlogging and waterlogging on the road. The high temperature in summer makes the road temperature rise, which brings great inconvenience to people's life. Permeable concrete is an eco-friendly concrete. It is a concrete with continuous pores made through material screening and a special process. It has a certain strength and a certain degree of air and water permeability. Permeable concrete is a pavement material that can not only satisfy the road performance, but also coexist harmoniously with the natural environment, and construct a comfortable living environment for human beings. The circulation of water is of great significance to increasing groundwater resources in cities, alleviating the heat island effect, and improving the urban climate.

In recent years, although permeable concrete has made great progress, there is a big difference between the experimental molding method of pervious concrete and the pavement molding process. Sufficient research, especially the existing molding methods have many uncertain factors, and the influence of molding methods and molding equipment on the performance of pervious concrete cannot be clearly given.

Contents of the invention

The object of the present invention is to provide a pervious concrete preparation system and molding method to overcome the above-mentioned deficiencies in the prior art. The molding method and preparation system can not only provide quantifiable standards for the laboratory molding of pervious concrete, but also obtain the optimal strength of pervious concrete through standard compaction times, and provide technical and data support for on-site construction. The molding method and preparation system improve the strength of the pervious concrete, provide a standard for the molding method and compaction degree of the pervious concrete, further optimize the on-site construction technology, and improve the applicability and universality of the pervious concrete.

In order to achieve the above object, the present invention adopts the following technical solutions:

A permeable concrete preparation system includes: a forming device, a compacting device and a demoulding device. The forming device includes forming steel molds, bases, and steel loading molds; the compacting device includes compacting rods, drop hammers, round steel cylinders, and compacted steel blocks; the demoulding device includes demoulding steel molds and compacting steel blocks. Block, round steel ring.

The forming device is applied to the forming of permeable concrete.

The forming steel mold is buckled on the base through four steel blocks on the base; the charging steel mold is buckled on the forming steel mold through the steel blocks welded around the bottom; the inner diameter of the upper end of the forming steel mold is 99× 99mm square, the inner diameter of the lower end is a square of 101×101mm, the height is 100mm, and the thickness of the steel plate is 6mm; the inner diameter of the charging steel mold is a cuboid of 99×99×80mm, and the thickness of the steel plate is 6mm.

The compaction device is applied to the compaction of permeable concrete.

The drop hammer is a cylindrical steel block with a hole in the middle, the compaction rod is connected with the drop hammer through the gap of the drop hammer, the circular steel cylinder is buckled at the bottom of the compaction rod, and the compaction steel block passes through The upper circular steel ring is connected with the circular rigid cylinder; the inner diameter of the hole in the middle of the drop hammer is 22mm, the weight is 8kg, and there are handles on the left and right sides of the drop hammer; the compaction rod is a steel rod with a diameter of 30mm, the length 1m, marked with a centimeter scale; the size of the compacted steel block is a cuboid steel block of 98×98×12mm.

The demoulding device is applied to the demoulding of permeable concrete.

The stripping steel mold is buckled with the bottom of the forming steel mold during demoulding; the compacted steel block is aligned with the edge of the stripping steel mold; the upper surface of the compacted steel block is welded with a circular steel ring with an outer diameter of 40mm, Circular steel cylinders and circular steel rings can be socketed respectively; the upper end of the demoulding steel mold is a square of 103×103mm, the lower end is a square of 110×110mm, the height is 120mm, and the thickness of the steel plate is 6mm.

A method for using a preparation system of permeable concrete, comprising the following steps:

A. When forming, install the forming steel mold on the base, the lower end of the forming steel mold is on the upper end and the lower end, and put the configured permeable concrete into the forming steel mold, and fill it up;

B. Install the charging steel mold on the forming steel mold, determine a certain height according to the loose laying coefficient, and fill the concrete to the required height;

C. Put the compacted steel block into the charging steel mold, pass the compacting rod through the hole left by the drop hammer, the lower end of the compacted rod is connected with the compacted steel block through a circular steel cylinder, and lift the drop hammer to a certain height, Falling, repeat this process to the required number of times;

D. After the compaction is completed, remove the compaction bar, remove the charging steel mold, and remove the forming steel mold from the base for maintenance. At this point, a permeable concrete specimen is formed, and this process is repeated to form multiple specimens;

E. After three days of standard maintenance, the mold is demoulded. When demolding, the demoulding steel mold is connected to the forming steel mold through the welding iron blocks around the upper end. Sleeved on the steel ring on the upper part of the compacted steel block, the press exerts pressure on the compacted steel block through a circular steel cylinder, so that the permeable concrete block is released from the forming steel mold.

The beneficial effects of the present invention are:

1. Plastic molds are generally used for the molding of concrete specimens. Although the plastic molds are easy to demould, they deform greatly and are easy to break during the compaction process. There will be no damage to the mold during the process;

2. The forming device adopts a steel mold with no bottom and no cover, and the inner diameter of the upper end of the steel mold is 2mm smaller than the inner diameter of the lower end, which makes demoulding easier;

3. The charging mold of this forming device can be docked with the forming mold, and the material is loaded to a certain height according to the loose laying coefficient for compaction, which avoids the error in the size of the compaction work caused by multiple loadings and improves the compaction process. The accuracy of compaction work provides reliable technical and data support for on-site construction;

4. The height of the falling hammer of this compaction device is adjustable, and the number of compactions is variable. It simulates the on-site construction machinery. The test data and conclusions can be directly used to guide the on-site construction, avoiding the inapplicability of the laboratory forming method and process to the on-site construction. .

Description of drawings

Fig. 1 is a structural schematic diagram of the forming device of the permeable concrete preparation system of the present invention:

1. Base; 2. Forming steel mold; 3. Loading steel mold; 4. Compacting steel block; 5. Round steel cylinder; 6. Compacting rod; 7. Dropping hammer.

2 is a structural schematic diagram of the demoulding device of the permeable concrete preparation system of the present invention: 2. forming steel mold; 4. compacting steel block; 5. circular steel cylinder; 8. demoulding steel mold; 9. circular steel ring.

Fig. 3 is the relationship curve between the number of compactions and the 7-day compressive strength in the permeable concrete forming method of the present invention. It can be seen from the figure that the 7d compressive strength first increases and then decreases with the increase of the compaction times, and the 7d compressive strength is the highest when the compaction times are 40 times.

Fig. 4 is the statistical table of compaction times and 7-day compressive strength values in the permeable concrete molding method of the present invention, the experiment is divided into 5 groups altogether, each group has 3 test pieces, and each group compacts 10, 20, 30, 40, 50 respectively times, and measured its 7-day compressive strength value in the table.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

A kind of forming equipment of permeable concrete preparation system is shown in Fig. 1, forming steel mold 2 is fixed on the base 1 by four welding iron blocks on the base 1, and the charging steel mold 3 is passed four welding iron blocks around its bottom The block and the forming steel mold 2 are butted together. After charging, the compacted steel block 4 is put into the charging steel mold 3. The compacting rod 6 is connected with the compacted steel block 4 through the circular steel cylinder 5. The compacting rod 6. The bottom is a tapered column head whose outer diameter is smaller than the inner diameter of the circular steel cylinder 5. The upper end of the compacted steel block 4 is welded with a circular steel ring whose outer diameter is smaller than the inner diameter of the circular steel cylinder 5. The compacting rod 6 passes through the The circular hole in the middle of the hammer 7 allows the drop hammer 7 to freely fall along the compacting rod 6.

A demoulding device for a permeable concrete preparation system is shown in Figure 2. The demoulding steel mold 8 is docked with the forming steel mold 2 through welding iron blocks around the upper end, and the lower part of the forming steel mold 2 is aligned with the outer edge of the upper part of the demoulding steel mold 8. , the compacted steel block 4 is aligned with the inner edge of the formed steel mold 2 during demoulding, the circular steel ring 9 is sleeved on the steel ring on the upper part of the compacted steel block 4, and the press press passes the circular steel ring 9 to compact the steel The block 4 applies pressure, and the steel block 4 is compacted to separate the permeable concrete test block from the formed steel mold 2 .

The circular steel cylinder 5 has an inner diameter of 43mm, the upper part of the compacted steel block 4 is welded with a steel ring with an outer diameter of 40mm, the lower part of the compacted rod 6 is welded with a circular tray with an outer diameter of 50mm, the outer diameter of the round column head of the lower part of the compacted rod 6 is 40mm, and the middle part of the drop hammer Round hole, inner diameter 35mm. The drop hammer 7 can move freely up and down through the compaction rod 6, and the circular tray at the lower part of the compaction rod 6 transmits the gravitational potential energy of the drop hammer to the compacted steel block 4 through the circular rigid cylinder, and the compacted steel block 4 transfers the potential energy Concrete test piece; the inner diameter of the upper part of the loading steel mold 3 is the same as that of the forming steel mold 2, which is 99×99mm, and the thickness of the steel plate is the same, which is 6mm, and the edges of the two should be aligned during use; The inner diameter of the upper part of the mold steel mold is 103 × 103mm, and the thickness of the steel plate is the same, which is 6mm. When in use, the lower part of the forming steel mold is aligned with the upper outer edge of the demoulding steel mold.

A method for forming permeable concrete, comprising the steps of:

A. First apply a layer of engine oil to the forming steel mold, base and compacted steel block, put a layer of plastic paper on the base, and install the forming steel mold on the base;

B. Put the configured permeable concrete into the forming steel mold, insert half of it into the mold and pound it 10 times with a metal rod, and then fill it up;

C. Install the charging steel mold on the forming steel mold, determine a certain height according to the loose laying coefficient, fill the concrete to the required height, and insert and pound it with a metal rod 10 times. If the aggregate is lower than the calibrated height, you need to Feed again to level the aggregate surface;

D. Put the compacted steel block into the charging steel mold, pass the compacting rod through the hole of the drop hammer, the lower end of the compacted rod is connected with the compacted steel block through a circular steel cylinder, and lift the drop hammer to a certain height ( Can be 20cm, 40cm, 60cm), drop, repeat this process to the required number of times (can be 10, 20, 30, 40 respectively);

E. After the compaction is completed, remove the compaction rod, remove the charging steel mold, press the cardboard to form the aggregate, turn over the forming steel mold and the base, remove the base, and perform maintenance. So far, one permeable concrete specimen has been formed, and this process is repeated to form multiple specimens.

Specific examples:

Using this molding method, lift the drop hammer to a height of 40cm, compact it 10, 20, 30, 40, and 50 times respectively, and measure its 7d compressive strength, as shown in Figure 4; and obtain its 7d compressive strength curve, as shown in Figure 4. 3;

It can be seen from Figure 3 that when the compaction height is 40cm and the compaction times are 40 times, the compressive strength is the highest.

Although the specific implementation of the present invention has been described above in conjunction with the accompanying drawings, it does not limit the protection scope of the present invention. Those skilled in the art should understand that on the basis of the technical solution of the present invention, those skilled in the art do not need to pay creative work Various modifications or variations that can be made are still within the protection scope of the present invention.

Claims (6)

1. A permeable concrete preparation system is characterized in that it comprises: forming device, compacting device and demoulding device; forming device has forming steel mold, base, charging steel mold; compacting device has compacting rod, Dropping hammer, circular steel cylinder, compacted steel block; demoulding device, including demoulding steel mold, compacted steel block, circular steel ring; the forming device is applied to the forming of permeable concrete, and the compacting device is applied For the compaction of permeable concrete, the demoulding device is applied to the demoulding of permeable concrete. 2. A permeable concrete preparation system according to claim 1, characterized in that, the forming steel mold is buckled on the base through four steel blocks on the base. 3. The permeable concrete preparation system according to claim 1, wherein the charging steel mold is buckled on the forming steel mold through steel blocks welded around the bottom. 4. A permeable concrete preparation system according to claim 1, wherein one end of the circular steel cylinder is buckled on the bottom of the compacting rod, and the other end is connected to the circular steel ring on the upper part of the compacting steel block . 5. A kind of permeable concrete preparation system as claimed in claim 1, is characterized in that, described stripping steel mold is buckled with forming steel mold bottom when demoulding; Described compacted steel block and demoulding steel mold interior Align the edges. 6. A forming method of permeable concrete as claimed in claim 1, characterized in that, comprising the following steps: A. First apply a layer of engine oil to the forming steel mold, base and compacted steel block, put a layer of plastic paper on the base, and install the forming steel mold on the base; B. Put the configured permeable concrete into the forming steel mold, insert half of it into the mold and pound it 10 times with a metal rod, and then fill it up; C. Install the charging steel mold on the forming steel mold, determine the height according to the loose laying coefficient, fill the concrete to the required height, insert and pound it with a metal rod 10 times, if the aggregate is lower than the calibrated height, it needs to be replenished again material to level the aggregate surface; D. Put the compacted steel block into the charging steel mold, pass the compacting rod through the hole of the drop hammer, the lower end of the compacted rod is connected with the compacted steel block through a circular steel cylinder, and lift the drop hammer to a certain height ( Can be 20cm, 40cm, 60cm), drop, repeat this process to the required number of times (can be 10, 20, 30, 40 respectively); E. After the compaction is completed, remove the compaction rod, remove the charging steel mold, press the cardboard to form the aggregate, turn over the forming steel mold and the base, remove the base, and perform maintenance; So far, one permeable concrete specimen has been formed, and this process is repeated to form multiple specimens.