CN101007723A - Concrete water-permeable brick using steel slag as aggregate - Google Patents

Abstract

A concrete permeable brick using steel slag as aggregate, characterized in that: the permeable brick contains the following components in weight percentage: 70-85% of steel slag with a crushing value of less than 5% and a free calcium oxide content of less than 3% ; 10-25% of C52.5 low-alkali cement; 0.5-6% of reinforcing agent; 0-3% of coloring powder; 3.5-5% of water. Steel slag, cement, reinforcing agent, coloring powder, and water are classified and mixed in two mixers, and then the secondary material distribution process is used to finally form the concrete permeable brick. The invention solves the problems of high cost and high energy consumption of the existing knot-type ceramic permeable bricks; the problem that the water permeability and compressive strength of the cement permeable bricks cannot be taken into account, and also utilizes metallurgical solid waste steel slag to solve the problems caused by steel slag Problems of waste of resources and environmental pollution. The all-ecological steel slag concrete permeable brick of the present invention not only has excellent water permeability, but also has high compressive strength.

Description

A concrete permeable brick using steel slag as aggregate

technical field

The invention belongs to the field of building materials, in particular to a permeable road brick formed by pressing waste steel slag and cement at normal temperature.

Background technique

At present, the common pavement permeable bricks are roughly divided into sintered ceramic permeable bricks and cement permeable bricks. However, sintered ceramic permeable bricks have high cost and high energy consumption, and cannot be widely promoted at present, while cement permeable bricks either have low water permeability. Either the water permeability is good, but the compressive strength is not high. It is difficult to balance the performance of these two aspects. Steel slag is a kind of metallurgical solid waste that is currently difficult to use with high added value. At present, a large amount of waste slag produced by steelmaking in major iron and steel plants in my country cannot be disposed of. , long-term land occupation, waste of resources and cause certain environmental pollution.

Contents of the invention

The purpose of the present invention is to process the waste steel slag, add a special reinforcing agent and high-strength cement, and adopt the secondary distribution vibration and pressure molding process to make a fully ecological steel slag concrete permeable brick with excellent water permeability and high compressive strength.

In order to achieve the above object, the technical means adopted by the present invention is: a concrete permeable brick using steel slag as aggregate, and the permeable brick contains the following components in weight percentage:

70-85% of steel slags with a crushing value of less than 5% and a free calcium oxide content of less than 3%;

10-25% C52.5 low-alkali cement;

0.5-6% enhancer;

0-3% coloring powder;

3.5-5% water.

The specifications of the steel slag are 5-8mm for the brick body, and 1-3mm for the upper surface of the brick body. The reinforcing agent is selected from ethylene vinyl acetate emulsion or polyvinyl alcohol emulsion. The permeable brick made of ethylene vinyl acetate emulsion has high strength, and the permeable brick made of polyvinyl alcohol emulsion has average strength, but the dosage is low and the cost is low.

The coloring powder is selected from iron oxide inorganic pigments, and all qualified products sold in the market can be used, but Bayferrox inorganic pigment products are the best.

After the steel slag, cement, reinforcing agent, coloring powder, and water described in the above claims are classified and mixed in two mixers, the secondary distribution process is adopted, and finally formed,

The main material of the brick accounts for 90% of the brick volume and the fabric accounts for 10% of the brick volume and is mixed separately according to different proportions. The main material that has been mixed is first injected into the brick mold, and then the mixed fabric is injected into the brick mold as the surface layer , and then press vibration molding.

The secondary material distribution process is adopted, in which the main body of the permeable brick uses steel slag with a particle size of 5-8mm as aggregate, and no colorant is added to the main body, while the surface layer with a thickness of 6mm uses steel slag with a particle size of 1-3mm as aggregate and colorant is added at the same time.

Only by using the pressurized belt vibration forming process can the formed permeable brick body have sufficient structural strength, and the forming excitation force is greater than 2 tons.

Mix 300 kg of C52.5 cement, 1,500 kg of 5-8MM steel slag, 1.5 kg of reinforcing agent and 80 kg of water in a forced mixer for 30-60 seconds, and spread them in permeable brick embryos as the main body; at the same time, mix C52. 50 kg of cement, 250 kg of 1-3MM steel slag, 0.25 kg of reinforcing agent, 1.5 kg of colorant, and 15 kg of water are mixed in a forced mixer for 30-60 seconds and spread on the main body of the permeable brick as the surface layer, that is, Dutch brick The secondary fabric technology, pressurization and vibration molding at the same time, the molding excitation force is greater than 2 tons, then demoulding, watering and curing for more than 7 days after 24 hours, the general specification is 20 cm long, 10 cm wide, and 6 cm thick. The volume of the brick body contains 20% of a large number of connected and evenly distributed permeable holes. Because the pores are large, the water will not stay in the brick in large quantities, so the bricks made by this technology will not be damaged by freezing at low temperatures. It does not contain water and will not freeze, so it has good frost resistance.

The beneficial effects of using the present invention are: 70% of the raw materials used in this permeable brick are scrap steel slag, which is a real ecological permeable brick that turns waste into ^treasure . s, the pavement paved with this product has no water accumulation during heavy rain, strong pressure resistance, no sintering required for normal temperature molding, and less energy consumption.

Detailed ways

A concrete permeable brick using steel slag as an aggregate is made of steel slag, cement, reinforcing agent, coloring powder and water as raw materials according to the following formula.

Raw material Specifications Consumption (kg)

Portland cement C52.5 conch 350

High-quality inorganic pigments Bayer 0～10.5

Ethylene polymer polymer emulsion Solid content 40% 1.75～21

Steel slag 1～3mm 150～300

Steel slag 5～8mm 1450～1600

Water Tap water 90～100

The method for producing steel slag concrete permeable bricks is carried out according to the following steps:

material selection

Thermally purify and adjust the waste steel slag to reduce the content of free calcium oxide in the steel slag to less than 3%, and the crushing value is less than 5%. Then, the scrap steel slag is crushed and classified into two specifications of 1-3mm and 5-8mm for use ;

Cement, C52.5 low-alkali cement is used to ensure the bonding strength between steel slag particles,

The reinforcing agent is selected from ethylene vinyl acetate emulsion or polyvinyl alcohol emulsion. The permeable brick made of ethylene vinyl acetate emulsion has higher strength as the preferred choice. The permeable brick made of polyvinyl alcohol emulsion has average strength, but the dosage is low and the cost is low;

The coloring powder is selected from iron oxide inorganic pigments. Qualified products sold in the market are all available, but the Bayferrox inorganic pigment products are the first choice;

Water is tap water.

craft

Mix 300 kg of C52.5 cement, 1,500 kg of 5-8MM steel slag, 1.5 kg of reinforcing agent and about 85 kg of water in a forced mixer for 30-60 seconds, and spread it into the mold of the Dutch brick; 50 kg of cement, 250 kg of 1-3mm steel slag, 0.25 kg of reinforcing agent, 1.5 kg of inorganic pigment, and about 10 kg of water, after stirring in a forced mixer for 30-60 seconds, spread on the surface layer of the above-mentioned 5-8mm material , that is, the secondary distribution process of Dutch bricks, simultaneously pressurized and vibrated (greater than 2 tons of exciting force), and then demoulded. After 24 hours, water and maintain for more than 7 days;

That is to say, the steel slag concrete permeable brick of this product is obtained. The general specification is 20 cm long, 10 cm wide, and 6 cm thick. The volume of the brick body contains 20% of a large number of connected and evenly distributed permeable holes. A large amount of water will not stay in the bricks, so the bricks made by this technology will not be damaged by freezing at low temperatures. In winter, the bricks will not freeze without water, so they have good frost resistance. The characteristics of this product are in terms of reinforcing agent, steel slag and selected ratio and process. The strength of permeable concrete permeable brick made of normal gravel cement can only be below 25Mpa, but it can be increased to 35Mpa with our reinforcing agent, and steel slag is used instead The stone strength can reach above 45Mpa.

The main technical indication test results of the steel slag concrete permeable brick are as follows:

The water permeability coefficient of this permeable brick reaches 5～10×10 ^-2 cm/s

The highest strength of permeable bricks reaches 35-45MPa

Process This permeable brick uses C52.5 cement to form at room temperature without sintering and less energy consumption.

Claims (8)

1, a kind of concrete permeable brick that utilizes slag as aggregate, it is characterized in that: described permeable brick comprises the following component of weight percent meter:

The crush values of 70-85% less than 5% simultaneously free calcium oxide content less than 3% slag;

The C52.5 low alkali cement of 10-25%;

The toughener of 0.5-6%;

The pigment of 0-3%;

The water of 3.5-5%.

2, the concrete permeable brick that utilizes slag as aggregate according to claim 1 is characterized in that: the specification of slag be particle diameter 5-8mm be used for the brick body, particle diameter be 1-3mm be used for brick body upper surface.

3, according to each described concrete permeable brick that utilizes slag as aggregate of claim 1-2, it is characterized in that: toughener is selected from ethylene-vinyl acetate emulsion or polyvinyl alcohol emulsion, the permeable brick intensity that the ethylene-vinyl acetate emulsion is made is higher, it is general that the polyvinyl alcohol emulsion is made permeable brick intensity, but the volume lower cost is also low.

4, according to each described concrete permeable brick that utilizes slag as aggregate of claim 1-3, it is characterized in that: pigment is selected from the iron oxides mineral dye, and the qualified product of market sale are all available, but is that the happy mineral dye product of Bayer is best.

5, a kind of each described method of utilizing slag as the concrete permeable brick of aggregate of claim 1-4 for preparing is characterized in that:

Aforesaid right is required described slag, cement, toughener, pigment, water, after classification mixes in two stirrers, adopts secondary material distributing technology, last moulding and getting;

The main body material of brick is accounted for 90% of brick volume to be accounted for 10% of brick volume with lining and separately stirs by different proportionings, the main body material that stirs is injected stock mould earlier, again the lining that stirs is injected stock mould as surface layer, pressurization and vibration moulding again, the permeable hole that in brick body volume, contained for 20% a large amount of the connection and be evenly distributed, because the hole in hole is bigger, so moisture content can not be detained in the brick in a large number, so the brick that present technique is made at low temperatures can be not freezing, not moisturely in the winter brick can not freeze, so good frost resistance is arranged.

6, the concrete permeable brick preparation method who utilizes slag as aggregate according to claim 5, it is characterized in that: adopt secondary material distributing technology, wherein permeable brick main body 5-8mm particle diameter steel slag as aggregate, do not add tinting material in the main body simultaneously, and the surface layer of thick 6mm adopts 1-3mm particle diameter steel slag as aggregate to add tinting material simultaneously.

7, according to each described concrete permeable brick preparation method who utilizes slag as aggregate of claim 5-6, it is characterized in that: use to add the permeable brick body that the pressure zone vibro-moulding process could guarantee moulding enough structural strengths are arranged, the moulding exciting force is greater than 2 tons.

8, according to each described concrete permeable brick preparation method who utilizes slag as aggregate of claim 5-7, it is characterized in that: with 80 kilograms in 300 kilograms of C52.5 cement, 1500 kilograms in 5-8MM slag, 1.5 kilograms of tougheners and water, in forced mixer, stir 30-60 after second, pave in permeable brick embryo as main body; Simultaneously 50 kilograms of C52.5 cement, 250 kilograms in 1-3MM slag, 0.25 kilogram of toughener, 1.5 kilograms of tinting materials, water are stirred 30-60 for 15 kilograms and paves after second on permeable brick main body as surface layer in forced mixer, be the secondary material distributing technology of Dutch brick, pressurization and vibration moulding simultaneously, the moulding exciting force is greater than 2 tons, the demoulding then, water seasoning is more than 7 days after 24 hours.