阅读说明：本技术 一种高强度高渗透全集料钢渣透水砖及其制备方法 (High-strength high-permeability full-aggregate steel slag water permeable brick and preparation method thereof ) 是由 于峰 尹珑龙 卜双双 秦尹 武萍 方圆 于 2020-08-03 设计创作，主要内容包括：本发明提供一种高强度高渗透全集料钢渣透水砖及其制备方法,涉及筑材料技术领域,包括如下重量份的组分：粗钢渣70～80份、钢渣砂7～8份、水泥15～20份、水3～5份、减水剂0.6～1.2份、丙烯酸树脂1～2份,该全集料钢渣透水砖强度等级为C40,透水系数为2.5mm/s以上。其制备方法包括以下步骤：1)将水泥、少量水和钢渣砂、粗钢渣混合搅拌均匀,得到混合料；2)将步骤1)拌制完成的混合料装入模具中,在混合料上表面施压1MPa压力,使混合料压实,稳压3分钟后,用抹刀修平表面,得到试块。本发明解决了现有钢渣透水砖在强度、透水系数和工程造价等方面难以兼顾的问题,促进钢渣大宗量利用,实现建筑资源环境的可持续发展,保护和改善城市生态环境。(The invention provides a high-strength high-permeability full aggregate steel slag water permeable brick and a preparation method thereof, which relate to the technical field of building materials and comprise the following components in parts by weight: 70-80 parts of coarse steel slag, 7-8 parts of steel slag sand, 15-20 parts of cement, 3-5 parts of water, 0.6-1.2 parts of water reducing agent and 1-2 parts of acrylic resin, wherein the strength grade of the full aggregate steel slag permeable brick is C40, and the water permeability coefficient is more than 2.5 mm/s. The preparation method comprises the following steps: 1) mixing and stirring cement, a small amount of water, steel slag sand and coarse steel slag uniformly to obtain a mixture; 2) and (2) filling the mixed material mixed in the step 1) into a mould, applying a pressure of 1MPa to the upper surface of the mixed material to compact the mixed material, stabilizing the pressure for 3 minutes, and then smoothing the surface by using a spatula to obtain a test block. The invention solves the problem that the existing steel slag water permeable brick is difficult to consider in the aspects of strength, water permeability coefficient, engineering cost and the like, promotes the utilization of a large amount of steel slag, realizes the sustainable development of building resource environment, and protects and improves the urban ecological environment.)

1. The high-strength and high-permeability full aggregate steel slag permeable brick is characterized by comprising the following components in parts by weight: 70-80 parts of coarse steel slag, 7-8 parts of steel slag sand, 15-20 parts of cement, 3-5 parts of water, 0.6-1.2 parts of water reducing agent and 1-2 parts of acrylic resin, wherein the strength grade of the full aggregate steel slag permeable brick is C40, and the water permeability coefficient is more than 2.5 mm/s.

2. The high-strength high-permeability full-aggregate steel slag permeable brick as claimed in claim 1, wherein the coarse steel slag has a particle size of 5-10mm, a basicity of 3.39, and an apparent density of 3350kg/m³The bulk density was 1750kg/m³The crush value was 11%.

3. The high-strength high-permeability full-aggregate steel slag permeable brick according to claim 1, wherein the fineness modulus of the steel slag sand is 2.41, the water content is 4.7%,the apparent density of the powder was 3457kg/m³Bulk density of 2160kg/m³The mud content is 0.4%, and the sand belongs to a medium sand III area.

4. The high-strength high-permeability full aggregate steel slag permeable brick as claimed in claim 1, wherein the acrylic resin has a viscosity of 45000-55000 MPa-s, a solid content of 55, an acidity of 2.0-5.0 and a Tg of 62 ℃.

5. The high-strength high-permeability full-aggregate steel slag permeable brick according to claim 1, wherein the water reducing agent is a naphthalene-based high-efficiency water reducing agent, and the water reducing rate is 20-22%.

6. The high-strength high-permeability full aggregate steel slag permeable brick according to claim 1, wherein the preparation method of the full aggregate steel slag permeable brick comprises the following steps:

1) firstly, mixing and stirring cement, a small amount of water and steel slag sand for 30-60 s, then adding coarse steel slag, stirring, adding a water reducing agent in the stirring process, adding water for 2-3 times, strictly controlling the water-cement ratio, and ensuring uniform stirring to obtain a mixture;

2) putting the mixed material prepared in the step 1) into a mould, applying a pressure of 1MPa to the upper surface of the mixed material to compact the mixed material, stabilizing the pressure for 3 minutes, and then leveling the surface by using a spatula to obtain a test block;

3) after the test block is manufactured, immediately covering a plastic film for maintenance;

4) and after the fully-integrated steel slag water permeable brick is demoulded, carrying out flattening treatment on the surface of the fully-integrated steel slag water permeable brick, and adding acrylic resin to complement the color according to the color requirement to obtain the fully-integrated steel slag water permeable brick.

7. The method for determining the content of each component in the high-strength high-permeability full aggregate steel slag permeable brick as claimed in claim 1, is characterized by comprising the following steps:

1) carrying out an orthogonal experiment of the compressive strength and the water permeability coefficient of the fully-integrated steel slag water permeable brick, namely carrying out multiple linear regression analysis on test data on the basis of a large amount of experimental researches, providing a calculation formula (I) of the compressive strength of the fully-integrated steel slag water permeable brick, and obtaining a calculated value of the compressive strength of the fully-integrated steel slag water permeable brick according to the obtained calculation formula;

f_c＝0.1666d²+129.9667w²-2.2598d-185.2813w+68.5609 (Ⅰ)

in the formula (f)_cThe compressive strength is obtained; d is the coarse steel slag substituted grain size; w is the water-cement ratio;

2) performing multivariate linear regression on a large number of test results as in the step 1), providing a calculation formula of the water permeability coefficient of the fully-integrated steel slag water permeable brick, and obtaining the water permeability coefficient of the fully-integrated steel slag water permeable brick according to the calculation formula (II);

k＝-0.2040d²+112.4081w²+3.1923d+25.1763w-17.7477 (Ⅱ)

in the formula, k is a water permeability coefficient; d is the coarse steel slag substituted grain size; w is the water-cement ratio;

3) in the actual engineering, firstly determining the compressive strength and the water permeability coefficient of the required water permeable brick, obtaining the initial mixing ratio of the all-steel slag aggregate slag water permeable brick according to a calculation formula, and then obtaining the all-aggregate steel slag water permeable brick meeting the engineering requirements by properly adjusting the water-cement ratio or the grain diameter of coarse steel slag;

4) determining the usage amount of the coarse steel slag, the cement, the water reducing agent, the acrylic resin, the water and the steel slag sand according to the steps 1) to 3), wherein the usage amount of the steel slag sand is 10% of the usage amount of the coarse steel slag.

8. The use of the high-strength high-permeability full aggregate steel slag permeable brick according to any one of claims 1 to 6 in permeable pavement structures of urban driveways, sidewalks, squares and parking lots.

Technical Field

The invention relates to the technical field of building materials, in particular to a high-strength high-permeability full aggregate steel slag water permeable brick and a preparation method thereof.

Background

The water permeable brick is a novel road paving material. The composite material has high porosity and excellent water permeability, can reduce dust pollution, absorb noise, supply underground water, reduce urban heat island effect, relieve pressure of urban flood control and drainage systems, and effectively overcome the defects of the traditional road paving material.

The common water permeable bricks on the market at present comprise ceramic water permeable bricks and steel slag water permeable bricks, the ceramic water permeable bricks are formed by high-temperature sintering, the performances of all aspects are superior, but the ceramic water permeable bricks are difficult to popularize comprehensively due to high cost and high energy consumption. The steel slag permeable brick has simple forming mode and low manufacturing cost, and is suitable for mass production. However, when the strength grade of the existing steel slag permeable brick reaches C40, the permeability coefficient of the existing steel slag permeable brick is generally low, and the existing steel slag permeable brick is difficult to meet the requirements on water permeability in the specification permeable brick (JC/T945-2005).

Therefore, in order to comprehensively improve the strength and the water permeability of the steel slag water permeable brick, researchers propose to use some novel cementing materials or additives, such as magnesium phosphate cement and active micro powder, in the steel slag water permeable brick. Although the strength and the water permeability of the steel slag permeable brick are obviously improved, the magnesium phosphate cement and the active micro-powder are high in price and difficult to popularize and use in a large range.

In order to overcome the defects of the conventional steel slag water permeable brick in the aspects of strength, water permeability coefficient, engineering cost and the like, the invention provides a high-strength high-permeability full-aggregate steel slag water permeable brick and a preparation method thereof.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a high-strength high-permeability full aggregate steel slag water permeable brick and a preparation method thereof, solves the problem that the conventional steel slag water permeable brick is difficult to consider the aspects of strength, water permeability coefficient, engineering cost and the like, promotes the utilization of a large amount of steel slag, realizes the sustainable development of building resource environment, and protects and improves the urban ecological environment.

(II) technical scheme

In order to achieve the purpose, the invention is realized by the following technical scheme:

a high-strength and high-permeability full aggregate steel slag permeable brick comprises the following components in parts by weight: 70-80 parts of coarse steel slag, 7-8 parts of steel slag sand, 15-20 parts of cement, 3-5 parts of water, 0.6-1.2 parts of water reducing agent and 1-2 parts of acrylic resin, wherein the strength grade of the full aggregate steel slag permeable brick is C40, and the water permeability coefficient is more than 2.5 mm/s.

Preferably, the particle size of the crude steel slag is 5-10mm, the alkalinity of the crude steel slag is 3.39, and the apparent density of the steel slag is 3350kg/m³The bulk density was 1750kg/m³The crush value was 11%.

Preferably, the steel slag sand has fineness modulus of 2.41, water content of 4.7% and apparent density of 3457kg/m³Bulk density of 2160kg/m³The mud content is 0.4%, and the sand belongs to a medium sand III area.

Preferably, the acrylic resin has the viscosity of 45000-55000 MPa-s, the solid content of 55, the acidity of 2.0-5.0 and the Tg of 62 ℃.

Preferably, the water reducing agent is a naphthalene-based high-efficiency water reducing agent, and the water reducing rate is 20-22%.

The preparation method of the high-strength and high-permeability full aggregate steel slag permeable brick comprises the following steps:

1) firstly, mixing and stirring cement, a small amount of water and steel slag sand for 30-60 s, then adding coarse steel slag, stirring, adding a water reducing agent in the stirring process, adding water for 2-3 times, strictly controlling the water-cement ratio, and ensuring uniform stirring to obtain a mixture;

2) putting the mixed material prepared in the step 1) into a mould, applying a pressure of 1MPa to the upper surface of the mixed material to compact the mixed material, stabilizing the pressure for 3 minutes, and then leveling the surface by using a spatula to obtain a test block;

3) after the test block is manufactured, immediately covering a plastic film for maintenance;

4) and after the fully-integrated steel slag water permeable brick is demoulded, carrying out flattening treatment on the surface of the fully-integrated steel slag water permeable brick, and adding acrylic resin to complement the color according to the color requirement so as to enhance the attractiveness and durability of the fully-integrated steel slag water permeable brick, thereby obtaining the fully-integrated steel slag water permeable brick.

The method for determining the content of each component in the high-strength and high-permeability full aggregate steel slag water permeable brick comprises the following steps:

1) carrying out an orthogonal experiment of the compressive strength and the water permeability coefficient of the fully-integrated steel slag water permeable brick, namely carrying out multiple linear regression analysis on test data on the basis of a large amount of experimental researches, providing a calculation formula (I) of the compressive strength of the fully-integrated steel slag water permeable brick, and obtaining a calculated value of the compressive strength of the fully-integrated steel slag water permeable brick according to the obtained calculation formula;

f_c＝0.1666d²+129.9667w²-2.2598d-185.2813w+68.5609 (Ⅰ)

in the formula (f)_cThe compressive strength is obtained; d is the coarse steel slag substituted grain size; w is the water-cement ratio;

2) performing multivariate linear regression on a large number of test results as in the step 1), providing a calculation formula of the water permeability coefficient of the fully-integrated steel slag water permeable brick, and obtaining the water permeability coefficient of the fully-integrated steel slag water permeable brick according to the calculation formula (II);

k＝-0.2040d²+112.4081w²+3.1923d+25.1763w-17.7477 (Ⅱ)

in the formula, k is a water permeability coefficient; d is the coarse steel slag substituted grain size; w is the water-cement ratio;

3) in the actual engineering, firstly determining the compressive strength and the water permeability coefficient of the required water permeable brick, obtaining the initial mixing ratio of the all-steel slag aggregate slag water permeable brick according to a calculation formula, and then obtaining the all-aggregate steel slag water permeable brick meeting the engineering requirements by properly adjusting the water-cement ratio or the grain diameter of coarse steel slag; for example: the compressive strength of the full-aggregate steel slag permeable brick is increased by 1MPa, the water-cement ratio of 0.0054 can be correspondingly reduced, the water permeability coefficient of the full-aggregate steel slag permeable brick is increased by 0.1mm/s, and the water-cement ratio of 0.0344 can be correspondingly increased;

4) determining the usage amount of the coarse steel slag, the cement, the water reducing agent, the acrylic resin, the water and the steel slag sand according to the steps 1) to 3), wherein the usage amount of the steel slag sand is 10% of the usage amount of the coarse steel slag.

The high-strength high-permeability full-aggregate steel slag permeable brick prepared by the invention can be used for permeable pavement structures such as urban lanes, sidewalks, squares and parking lots.

(III) advantageous effects

The invention provides a high-strength high-permeability full aggregate steel slag water permeable brick and a preparation method thereof, and the high-strength high-permeability full aggregate steel slag water permeable brick has the following beneficial effects:

1. the steel slag is solid waste generated in steel making, is screened and graded to replace coarse and fine aggregates in common water permeable bricks, and can promote the reutilization of the solid waste, protect the environment and natural resources and realize the sustainable development of the resource environment when being applied to the water permeable bricks.

2. The full-aggregate steel slag water permeable brick has high strength and good water permeable effect, and can be suitable for a water permeable pavement structure which has high strength requirement and is easy to cause waterlogging.

3. The invention solves the problem that the compressive strength and the water permeability coefficient of the existing steel slag water permeable brick can not be considered at the same time, the compressive strength of the full-aggregate steel slag water permeable brick reaches 40MPa, and the water permeability coefficient is more than 2.5 mm. The invention utilizes the waste steel slag as the aggregate, not only has simple manufacturing method, but also obviously reduces the construction cost, can promote the wide application of the steel slag permeable brick, and has obvious economic benefit and social benefit.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

On the basis of determining the characteristics of all materials in the full aggregate steel slag permeable brick, the water-cement ratio of the full aggregate steel slag permeable brick is 0.2 and the particle size of the steel slag aggregate is 5-10mm by adopting formula (I) and formula (II) according to the requirements that the compressive strength of the steel slag permeable brick is 40MPa and the water permeability coefficient is 2.5 mm/s. The full-aggregate steel slag permeable brick is basically prepared from the following components in parts by weight: 70-80 parts of crude steel slag; 7-8 parts of steel slag sand; 15-20 parts of cement; 3-5 parts of water; 0.6-1.2 parts of a water reducing agent; 1-2 parts of acrylic resin.