All-solid waste steel slag pervious concrete and preparation method thereof

Abstract

The invention discloses all-solid waste steel slag pervious concrete and a preparation method thereof. The all-solid waste steel slag pervious concrete is prepared from the following components in parts by mass: 2800 to 3200 parts of steel slag aggregate, 50 to 200 parts of steel slag powder, 650 to 800 parts of slag powder, 120 to 180 parts of gypsum, 280 to 320 parts of water and 2 to 4 parts of water reducing agent. According to the invention, the steel slag is used as the aggregate, and the steel slag powder, the slag powder and the gypsum are used as the cementing materials, so that the use of all solid wastes is realized, the cost is reduced, and the obtained concrete has higher compressive strength and permeability coefficient, and meets the standard requirements of pervious concrete.

Description

Technical Field

[0001] The invention relates to the technical field of concrete, and in particular to a full-solid waste steel slag permeable concrete and a preparation method thereof. Background Art

[0002] Steel slag is a kind of industrial solid waste generated in the smelting production process of the steel industry, and its output accounts for about 15% of crude steel production. Due to the vigorous development of my country's steel industry, a large amount of steel slag is produced every year. If these steel slags are not recycled, they can only be stored, which will occupy a lot of land and cause environmental pollution. Therefore, the reduction and resource utilization of steel slag is imminent.

[0003] Concrete is a common building material and a good way to dispose of various solid wastes. Due to waterlogging problems in some cities, the concept of sponge city has gradually emerged. Ordinary concrete pavement does not have water permeability and is difficult to alleviate the waterlogging problem. Therefore, some cities prefer to use permeable concrete with certain water permeability to pave the road surface. Steel slag has good wear resistance and certain internal pores, so it can be used as aggregate for permeable concrete.

[0004] At present, steel slag permeable concrete mostly uses cement as the cementing material, and the proportion of steel slag used is limited. Therefore, in order to further increase the proportion of steel slag used and reduce production costs, it is of great significance to develop steel slag permeable concrete made of all solid waste. Summary of the invention

[0005] In view of the above-mentioned shortcomings, the purpose of the present invention is to provide a full-solid waste steel slag permeable concrete and a preparation method thereof, so as to solve the technical problems of low steel slag utilization and high production cost of existing concrete.

[0006] To achieve the above object, the present invention is implemented through the following technical solutions: In a first aspect, the present invention provides an all-solid waste steel slag permeable concrete, which comprises, by weight: 2800-3200 parts of steel slag aggregate, 50-200 parts of steel slag powder, 650-800 parts of slag powder, 120-180 parts of gypsum, 280-320 parts of water, and 2-4 parts of water reducing agent.

[0007] Steel slag contains a large amount of dicalcium silicate, dicalcium ferrite and tricalcium silicate, and its mineral composition has a certain similarity with the mineral composition of cement clinker, so it also has the potential to be used as a cementitious material. The present invention uses steel slag as aggregate, and uses steel slag powder, slag powder and gypsum as cementitious materials, which not only realizes the use of all solid waste and reduces costs, but also the obtained concrete has higher compressive strength and water permeability coefficient, meeting the standard requirements of permeable concrete.

[0008] Preferably, the above-mentioned all-solid waste steel slag permeable concrete includes, by mass: 3000 parts of steel slag aggregate, 100-150 parts of steel slag powder, 700-750 parts of slag powder, 150 parts of gypsum, 280-320 parts of water, and 2-4 parts of water reducing agent.

[0009] Preferably, the particle size of the steel slag aggregate is 5-10 mm.

[0010] Preferably, the specific surface area of ​​the steel slag powder is 450-600 m 2 / kg.

[0011] Preferably, the specific surface area of ​​the slag powder is 450-600 m 2 / kg.

[0012] Preferably, the activity level of the slag powder meets the S95 standard.

[0013] Preferably, the gypsum is one or more of hemihydrate gypsum, desulfurized gypsum, fluorinated gypsum and natural gypsum.

[0014] Preferably, the specific surface area of ​​gypsum is 360-600 m 2 / kg.

[0015] Preferably, the water reducer is a polycarboxylic acid high-efficiency water reducer.

[0016] In a second aspect, the present invention provides a method for preparing all-solid waste steel slag permeable concrete, comprising the following steps: Weighing steel slag powder, slag powder and gypsum according to the ratio and mixing the powders evenly to obtain a full-solid waste cementitious material; The water reducing agent is mixed evenly with water to obtain a water reducing agent solution; The steel slag aggregate, all-solid waste cementitious material and water reducing agent solution are evenly mixed to obtain the all-solid waste steel slag permeable concrete.

[0017] The beneficial effects of the present invention are: Compared with conventional cement-based permeable concrete, the present invention uses steel slag as aggregate and adopts steel slag powder, slag powder and gypsum system as cementitious materials without any external alkaline activators such as water glass and caustic soda, thereby realizing the use of all solid waste to replace cement in the preparation of concrete, which not only reduces the production cost, but also the obtained concrete has higher compressive strength and permeability coefficient, meeting the standard requirements of permeable concrete. DETAILED DESCRIPTION

[0018] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] The particle size of the steel slag aggregate used in the following examples and comparative examples is 5-10 mm; the specific surface area of ​​the steel slag powder is 450-600 m 2 / kg; the specific surface area of ​​slag powder is 450-600 m 2 / kg, and its activity level meets the S95 standard; the gypsum is semi-hydrated gypsum from power plants, and after drying and grinding, the specific surface area is 360-600m 2 / kg; the water reducer is polycarboxylic acid high-efficiency water reducer.

[0020] Example 1 1) Take 150 parts of steel slag powder, 700 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a fully solid waste cementitious material.

[0021] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0022] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0023] Example 2 1) Take 100 parts of steel slag powder, 750 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a fully solid waste cementitious material.

[0024] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0025] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0026] Example 3 1) Take 200 parts of steel slag powder, 650 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a full-solid waste cementitious material.

[0027] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0028] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0029] Example 4 1) Take 50 parts of steel slag powder, 800 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a full-solid waste cementitious material.

[0030] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0031] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0032] Example 5 1) Take 100 parts of steel slag powder, 750 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a fully solid waste cementitious material.

[0033] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0034] 3) Add 3200 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are uniformly stirred to obtain all-solid waste steel slag permeable concrete.

[0035] Example 6 1) Take 100 parts of steel slag powder, 750 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a fully solid waste cementitious material.

[0036] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0037] 3) Add 2800 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are uniformly stirred to obtain all-solid waste steel slag permeable concrete.

[0038] Example 7 1) Take 100 parts of steel slag powder, 750 parts of slag powder, and 120 parts of hemihydrate gypsum and mix them evenly to obtain a full-solid waste cementitious material.

[0039] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0040] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0041] Example 8 1) Take 100 parts of steel slag powder, 750 parts of slag powder, and 180 parts of hemihydrate gypsum and mix them evenly to obtain a full-solid waste cementitious material.

[0042] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0043] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0044] Example 9 1) Take 100 parts of steel slag powder, 650 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a full-solid waste cementitious material.

[0045] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0046] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0047] Example 10 1) Take 100 parts of steel slag powder, 800 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a fully solid waste cementitious material.

[0048] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0049] 3) Add 3000 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly stirred to obtain all-solid waste steel slag permeable concrete.

[0050] Comparative Example 1 1) Take 150 parts of steel slag powder, 700 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a fully solid waste cementitious material.

[0051] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0052] 3) Add 3500 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are uniformly stirred to obtain all-solid waste steel slag permeable concrete.

[0053] Comparative Example 2 1) Take 150 parts of steel slag powder, 700 parts of slag powder, and 150 parts of hemihydrate gypsum and mix them evenly to obtain a fully solid waste cementitious material.

[0054] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0055] 3) Add 2500 parts of steel slag aggregate, the all-solid waste cementitious material obtained in step 1), and the water reducing agent solution obtained in step 2) into a mixer until they are evenly mixed to obtain all-solid waste steel slag permeable concrete.

[0056] Comparative Example 3 1) Take 1000 parts of PO42.5 ordinary Portland cement.

[0057] 2) Completely dissolve 3 parts of polycarboxylic acid high-efficiency water reducer in 300 parts of water to obtain a water reducer solution.

[0058] 3) Add 3,000 parts of steel slag aggregate, cement and water reducing agent solution into a mixer until they are mixed evenly to obtain all-solid waste steel slag permeable concrete.

[0059] The concrete mixture samples prepared in Examples 1-10 and Comparative Examples 1-3 were subjected to standard curing according to the curing conditions in GB / T 50081-2019 "Test Method for Mechanical Properties of Ordinary Concrete", and were taken out after curing to the corresponding age to test their strength and water permeability. The strength test was carried out according to T0553-2005 "Test Method for Compressive Strength of Concrete Cube". The water permeability test was carried out according to CJJ / T135-2009 "Technical Specification for Permeable Cement Concrete Pavement". The test results are shown in Table 1.

[0060] Table 1

[0061] As can be seen from Table 1, the all-solid waste steel slag permeable concrete provided by the present invention can still achieve good strength indicators and good permeability without adding cement or other alkaline activators, and has good application prospects. Compared with Example 1, it can be seen from Comparative Example 1 and Comparative Example 2 that when the amount of steel slag aggregate increases, the concrete permeability coefficient increases significantly, but the compressive strength decreases significantly, and it is impossible to meet the TC15 and permeable concrete strength requirements; when the amount of steel slag aggregate is reduced, the 28-day compressive strength is significantly improved, but the permeability coefficient decreases significantly, and the permeability capacity is greatly weakened. Compared with Example 1, Comparative Example 3 shows that the present invention can use all-solid waste cementitious materials to replace the more expensive silicate cement to achieve the preparation of permeable concrete.

[0062] It should be noted that the above embodiments all belong to the same inventive concept, and the description of each embodiment has its own focus. For matters that are not described in detail in some embodiments, reference may be made to the description in other embodiments.

[0063] The above-mentioned embodiments only express the implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A full solid waste steel slag permeable concrete, characterized in that: Calculated by mass, it includes: 2800-3200 parts of steel slag aggregate, 50-200 parts of steel slag powder, 650-800 parts of slag powder, 120-180 parts of gypsum, 280-320 parts of water, and 2-4 parts of water reducing agent.

2. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: Calculated by mass, it includes: 3000 parts of steel slag aggregate, 100-150 parts of steel slag powder, 700-750 parts of slag powder, 150 parts of gypsum, 280-320 parts of water, and 2-4 parts of water reducing agent.

3. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: The particle size of the steel slag aggregate is 5-10 mm.

4. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: The specific surface area of ​​the steel slag powder is 450-600 m 2 / kg.

5. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: The specific surface area of ​​the slag powder is 450-600 m 2 / kg.

6. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: The activity grade of the slag powder meets the S95 standard.

7. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: The gypsum is one or more of hemihydrate gypsum, desulfurized gypsum, fluorinated gypsum and natural gypsum.

8. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: The specific surface area of ​​the gypsum is 360-600 m 2 / kg.

9. The all-solid waste steel slag permeable concrete according to claim 1, characterized in that: The water reducer is a polycarboxylic acid high efficiency water reducer.

10. The method for preparing all-solid waste steel slag permeable concrete according to any one of claims 1 to 9, characterized in that: The following steps are involved: Weigh and mix steel slag powder, slag powder and gypsum according to the ratio to obtain a solid waste cementitious material; The water reducing agent is mixed evenly with water to obtain a water reducing agent solution; The steel slag aggregate, the all-solid waste cementitious material and the water reducing agent solution are evenly mixed to obtain the all-solid waste steel slag permeable concrete.

Images