The core technology

1. A series of products

1. Type A coagulant for standard bricks

2. Special C-type coagulant for shock-proof bricks 

               

3. Type B coagulant for hollow bricks

4. XC type coagulant for road construction and paving      

        

2. Product Features

"Qingdao Sidian Road Environmental Coagulant" is a patented product with the highest level of technology certified by Tsinghua University, Yale University in the United States, University of Cambridge in the United Kingdom, University of Sydney in Australia, and Hong Kong University. Adding 0.2-0.3% to various industrial solid waste and construction waste can condense the above-mentioned materials and harmful elements, and produce high-strength, non-secondary pollution-free building materials through pressure, and pave ecological and environmental protection roads.

"Qingdao Grace Road Patented Coagulant" is activated by sodium chloride and citric acid to activate and catalyze the active material, electrolyte and surface activity of raw materials. It can balance the charge on the particle surface of the raw material, reduce the thickness of the electric double layer, strengthen the chemical reaction and physical reaction process of the mixture, make the mixture form a stable complex structure, and improve the water stability and strength of the surface layer of the structure.

The China Academy of Building Materials used rock formation analysis, electron microscope scanning, X-ray diffraction, thermogravimetric and differential thermal analysis and other methods to analyze the solidification mechanism of the core samples of Grace Road's patented solidified raw materials. The solidification effect of the coagulant on the raw material is a comprehensive behavior. It has both physical adsorption and entanglement and chemical reaction. It is very effective for the securon effect of mixed raw materials, with excellent strength and water stability, and also has good freeze-thaw resistance.

3. Certification

The solid waste treatment technology of Qingdao Grace Road Environmental Protection Co., Ltd. has reached the international leading level. He has 2 Chinese invention patents, 5 new type and appearance patents, 3 European, American and British patents, and has won 5 awards.

4. Production equipment

(1) The output of the A-type automatic unsupported automatic packaging environmental protection brick production line: taking the standard brick (240×115×53mm) as an example, the molding time takes 20 seconds, and the number of each molding is 105. It can produce 18,900 standard bricks per hour. Each standard brick weighs 2.5 kilograms, and consumes industrial solid waste per hour: 47,250 kilograms or 47.25 tons. Working 10 hours a day, 330 days a year, can consume industrial solid waste: 155,925 tons per year. The entire production line requires 6 workers, 1 loader and 1 forklift.

(2) Output of B-type green brick production line: 10,800 standard bricks can be produced per hour with standard bricks (240*115*53MM). Each standard brick weighs 2.5 kilograms, and consumes industrial solid waste per hour: 27,000 kilograms or 27 tons. Working 10 hours a day, 330 days a year, can consume industrial solid waste: 89,100 tons per year. The entire line requires 8 workers, 1 loader and 2 forklifts.

(3) The advantages of the international patented intelligent new mixer:

1. It only takes 3.7 seconds to mix the mixture from the inlet to the outlet of the mixer, and the uniformity of the mixture is perfect. ***The interior of the international patented mixer consists of patented crushing teeth, patented stirring teeth and push teeth. The advanced intelligent control system automatically adjusts the speed of the mixer according to different brick types and output requirements. It can produce 200 cubic meters of raw materials per hour.                                      

2. The entire mixer system can automatically generate the operation data of the mixing system according to the automatically stored production data, which is convenient for workers to operate.

3. Each transmission point adopts advanced speed control system to realize flow control of various raw materials.

4. The dry humidity of the finished mixture is sent to the PLC by the advanced moisture detection system and compared with the set data. The flow rate of the high-pressure water pump is automatically adjusted in real time, and it can also be controlled manually.                                                        

5. The raw material storage of the mixer system fundamentally solves the problem of blockage of raw materials, and the vibration system runs automatically.

6. The unique mixer system can be used for two purposes, which can not only repair roads but also produce environmentally friendly bricks.

5. Solid waste recycling material pavement construction technology

The use of solid waste recycling materials to build roads does not require natural stones and sand, only coagulants and bulk solid wastes are used, which can well protect and improve the environment.

(1) Solid waste recycled pavement material, structure and performance

Smelting slag, gasification slag, slag, coal gangue, desulfurization gypsum, tailings slag, fly ash, red mud, domestic sludge, chemical sludge, phosphogypsum, construction waste, domestic waste incineration slag, weathered soil, alkali The mixture of industrial solid waste such as slag, construction waste, etc., cement and coagulant in proportion, has certain strength and durability, and its anti-freezing performance, water penetration resistance, sulfate corrosion resistance, and carbonization resistance. All are higher than the relevant performance requirements of concrete.

The solid waste recycled pavement material structure layer is divided into road surface layer, base layer and sub-base. When the structural layer is constructed in special climatic environments such as winter and rainy seasons, a special construction plan shall be formulated according to the actual situation of the project.

(2) Coagulant

It is an additive used to strengthen the chemical reaction and physical winding of solid waste recycled pavement materials, so that solid waste recycled pavement materials can form a stable complex structure and improve the water stability and strength of the surface layer of the structure.

(3) Factory mixing method

The construction method is to set up a mixing base in a centralized manner, and use special equipment to mix and prepare the recycled mixture.

(4) Composition and design steps of solid waste recycled pavement materials:

1. Determine the moisture content and specific gravity of raw materials and other indicators

2. The amount of coagulant should be selected according to 0.2%.

3. The heavy-duty compaction test method should be used to determine the maximum water content and maximum dry density of different cement contents, mixtures.

4. Calculate the dry density of the specimens with different cement content according to the specified degree of compaction.

5. Prepare solid waste recycled pavement material test pieces, the size of the test piece is Φ150mm╳150mm, and the number of test pieces is not less than 9.

6. The maintenance and compressive strength measurement of the specimen should refer to the relevant requirements of JTG E51 "Test Regulations for Inorganic Binder Stabilizing Materials of Highway Engineering".

7. According to the results of the 7d unconfined compressive strength test, the cement content and the coagulant content are selected, and the minimum cement content should not be less than 3%; the interpolation method calculates the maximum dry density and maximum moisture content.

(5) Construction process and process requirements of solid waste recycled pavement materials

1. Mixing of solid waste recycled pavement materials

The production of solid waste recycled pavement materials adopts the intelligent patent mixer and supporting technology of Grace International Road.

The mixing shall be carried out according to the material specifications and proportions determined by the proportion design of solid waste recycled pavement materials.

The proportion of pellets in the raw materials is not less than 20%-30%, the size of the pellets is 5mm-8mm, and the base and low base layers can reduce the requirements.

The mixing plant shall provide the site with the product qualification certificate, the amount of cement, the amount of coagulant, the amount of solid waste admixture, the mixing ratio of the mixture, and the standard value of R7 strength.

2. Transportation of solid waste recycled pavement materials

A dump truck is used.

According to the size of the project and the length of the transportation distance, a sufficient number of transport vehicles are equipped. The compartment should be cleaned before loading, and there should be no sundries, and measures should be taken to prevent moisture loss after loading.

3. Paving of solid waste recycled pavement materials

(1) The stacking time of the mixture should not be too long, and it should not exceed 4 hours from the discharge of the mixer to the completion of paving and rolling. When the mixing plant is far away from the paving site, the amount of water used for mixing the mixture can be appropriately increased (generally controlled within 5%), and it should be covered during transportation to prevent water evaporation. The paver shall be paved in place as soon as possible according to the pre-set elevation and punctuation, and the corners that cannot be paved by the paver shall be paved in place manually at the same time and leveled to the specified elevation for paving.

(2) The compaction coefficient should be determined by test before construction. The compaction coefficient should be 1.10~1.33 (related to the material).

(3) The maximum compaction thickness of each layer of the mixture should not be greater than 200mm, and should not be less than 100mm.

(4) The mixture should not exceed 4h from stirring until the paving is completed. The amount of materials should be calculated according to the construction length of the shift.  

4. Rolling of solid waste recycled pavement materials

(1) When the compacted thickness of the road surface is 150mm-200mm, the large-scale retractable paver is used for paving, and the 22-26-ton rubber tire road roller and the 6--8-ton double steel wheel are used for rolling and forming.

(2) When the compacted thickness of the road surface is 100mm-150mm, the large-scale retractable paver should be used for paving, and the 22-ton rubber wheel roller and the 3-6-ton double steel wheel should be used for rolling and forming.

(3) Roll forming at one time within the specified time.

(4) During the rolling process, the surface of the mixture should always be kept moist. The straight section of the road surface is rolled from the shoulders on both sides to the center of the road; the flat curve section is rolled from the inner shoulder to the outer shoulder. When rolling, the rear wheel should overlap 1/2 of the wheel width and must exceed the seam between the two sections. When the rear wheel compacts the full width of the road, it is one pass, and the rolling is carried out until the required compactness. The two sides of the road should be pressed twice more. destroy. Small-scale road rollers should be used for the corners that cannot be rolled by the road roller, and the workers should roll them in place, generally 2 to 3 times more than the road surface, until they are compacted and reach the specified elevation. After compaction, the surface should be flat without wheel traces or bulges, and the cross section should be correct, and the road arch should meet the requirements.

(5) When the compaction thickness of the paved roadbed exceeds 20 cm, it should be paved in layers of 20 cm per layer, and the minimum compaction thickness of each layer is 10 cm. When the paving layer is more than one layer, first lay one layer, if the next layer is laid on the same day, it needs to be completed within 6 hours, otherwise the next layer needs to be laid after 2 days.

5. Stubble connection and maintenance of the base of the mixture

After the road is compacted and formed, cover it with plastic film for 2-7 days. When the temperature is above 30°C, the construction joint will be cut finally. When the temperature is lower than 30°C, the construction joint will be cut after 2-3 days. In order to ensure the quality, it is not allowed below 0°C. construction. The pavement construction joints are set at 3 times the road width, and the joint width is 10-15mm. When the strength reaches about 10Mpa, use a slitter to cut the construction seam. When the front and rear construction joints are connected, the hardened road surface should be cut neatly with a cutting machine, and the hardened road surface should not be damaged during subsequent construction and rolling. The side slopes on both sides of the road shall be compacted in place simultaneously with the road surface by manual manual small drum rollers, and the construction shall be in place according to the elevation and size required by the drawings, and the roadbed slopes shall be reasonably connected. It can be put into use after 3-7 days of road maintenance.

Title VI Features and Advantages

1. Technical features: The integrated solution for the treatment of industrial solid waste and construction waste using Qingdao Grace Road's "environmentally friendly coagulant" and "energy-saving intelligent brick making machine and international patented intelligent mixing system" has the following unique advantages:

More: The consumption rate of industrial waste and construction waste reaches 91.6%;

Fast: The road can pass after 2 days of rolling and forming, and the strength reaches C30 in 10 days; the patented brick making machine produces 18,900 standard bricks per hour;

Good: road and building materials products meet or exceed relevant national quality standards;

Province: a large amount of solid waste is added, and a small amount of "environmentally friendly coagulant" is added (0.2%); the brick making machine is fed from a single warehouse and occupies a small area. Road paving adopts mobile mixer for batching and feeding, and rolling and forming with paving. The construction process is short, the equipment investment is low, the construction personnel are few, and the construction efficiency is high.

2. Comparison of road paving technologies

Three, various types of environmentally friendly bricks

4. Test report

The 28-day unconfined compressive strength of the road built by Qingdao Grace Road Company using ferrochromium slag is 33.7MPa, and the strength reaches the strength of C30 cement concrete, but the cost is much lower than the cost of cement road construction.

Qingdao Grace Road Company uses domestic waste incineration slag, construction waste, gasification slag, slag, coal gangue, sticky red mud, smelting slag, desulfurization gypsum, tailings slag, fly ash, domestic sludge chemical sludge, phosphogypsum, The strength of various types of environmentally friendly bricks produced from solid wastes such as weathered soil and alkali slag has reached or far exceeds the national standard.

Grace Road environmental protection technology treats solid waste, which has the characteristics of large amount of solid waste and low cost. The test report shows that the content of ferrochromium slag in environmentally friendly bricks exceeds 90%, and the strength level, wear resistance, frost resistance, slip resistance, and radionuclide limits are limited. All comply with GB/T25993-20 standard.

Grace Road environmental protection technology treats solid waste. The core coagulant is added at 0.2% and the cement is added at about 8%. The coagulant has a very significant comprehensive coagulation effect on various solid waste raw materials. Compared with ordinary non-burning bricks, it has the characteristics of high strength, good frost resistance and no secondary pollution.