CN104788063B - One kind is unburned to exempt from pressure brick made of mud and preparation method thereof - Google Patents

Abstract

The invention discloses a non-burning and pressure-free silt brick and a preparation method thereof. It is mainly made of the following components in mass fraction ratio: dredging silt 70-85%, cement 5-20%, gypsum 2-7%, Slag 0~20%, fly ash 0~20%, lime 0~10%, early strength agent 0~1%. The invention has the following advantages: (1) The invention adopts non-sintering technology, which can save energy and avoid air pollution and solid waste pollution caused by calcination; Excessive power input; (3) The dredged sludge used in the present invention does not need to be dehydrated, and the process is simple and easy; (4) The production process of the present invention is simple, does not require steam curing, uses less machinery, less investment, and less energy consumption; ( 5) The present invention uses dredging silt to produce brick masonry materials, which can not only dredge rivers, beautify waters, but also turn waste into treasure, and realize the recycling of resources.

Description

A fire-free and pressure-free silt brick and its preparation method

technical field

The present invention relates to the technical fields of civil engineering and environmental engineering. The present invention produces building materials by recycling renewable resources, thereby realizing the recycling of resources and achieving the purpose of saving energy. The present invention particularly relates to a non-burning and pressure-free silt brick and its preparation method .

Background technique

Sintered clay bricks, as a traditional wall material, have been used for a long time, and there are some problems: a large amount of clay is required, and a large amount of cultivated land needs to be destroyed in order to obtain clay; the preparation process requires high-temperature calcination, which consumes a lot of energy; A large amount of solid and gaseous wastes have caused serious pollution to the environment. Therefore, the country restricts the firing of solid clay bricks from soil taken from cultivated land.

There are many rivers, lakes and seas in our country, and a large amount of sediment is deposited. In order to play a good role in regulating and storing, supply water and fight drought, it is necessary to continuously dredge the rivers, lakes and seas. If a large amount of silt is not properly treated, it will not only occupy a large amount of farmland, but also cause serious environmental problems.

In the prior art, the use of silt to produce wall materials has been explored, and the common ones are sintered bricks from the Yellow River silt, and unburned bricks mixed with industrial waste. Chinese patent CN2009102194015 Yellow River silt sintered brick and its manufacturing method, which uses the Yellow River silt as the main production raw material, and is made through crushing and screening, batching, stirring, aging, molding, cutting, drying, roasting and other process steps. The advantage is that it can be used in large quantities. The Yellow River silt can be used for dredging in the Yellow River Basin. On the other hand, slag and coal gangue waste slag are used as ingredients, which has the advantages of energy saving, waste utilization, and rational allocation of resources. But there is also the deficiency of consuming a large amount of energy and causing pollution to the environment.

Most of the non-fired silt bricks need dehydration treatment of silt, using pressure forming and steam curing methods, compared with non-burning and pressure-free bricks, the relative investment is relatively large, especially the pressure forming machinery is expensive; the production process requires a lot of Large power input and more machinery are used; the production process requires dehydration treatment, and the process is complicated.

Contents of the invention

The purpose of the present invention is to overcome the disadvantages of high energy consumption and easy environmental pollution of building bricks in the prior art, and provide a non-burning and pressure-free mud brick and its preparation method, which are low in production cost, simple in production technology, and low in energy consumption. , Under the premise of not causing environmental pollution, the use of dredging silt to produce non-burning and pressure-free silt bricks that meet market demand can achieve the dual purpose of dredging rivers, beautifying the water environment, and turning waste into treasure.

To achieve the above object, the present invention adopts the following technical solutions:

A non-burning and pressure-free silt brick, mainly made of the following components in the mass fraction ratio: dredged silt 70-85%, cement 5-20%, gypsum 2-7%, slag 0-20%, pulverized coal Ash 0-20%, lime 0-10%, early strength agent 0-1%.

Preferably, the dredged silt is silt directly cleaned from the river without dehydration treatment, and its moisture content is 55-86%.

Preferably, the cement is composite Portland cement or ordinary Portland cement, and the cement strength is not lower than 42.5.

Preferably, the gypsum is building gypsum powder.

Preferably, the slag is the molten material obtained when the blast furnace smelts pig iron, and is quenched and granulated into active granulated blast furnace slag, and then dried and ground to obtain slag powder, the main components of which include silicate and silicon Aluminate.

Preferably, the lime is powdered quicklime obtained by grinding block quicklime and sieving.

The content of the accelerator is pure substance content.

A method for preparing fire-free and pressure-free mud bricks, comprising the following steps:

(1) Raw material preparation: take the dredged silt to measure the water content, and select the dredged silt with a water content between 55% and 86% for use; the molten material mainly composed of silicates and aluminosilicates produced during blast furnace smelting pig iron , through quenching, drying, grinding and sieving to prepare active granulated blast furnace slag powder; grinding block quicklime and passing through a sieve with an aperture of 2mm to obtain powdery quicklime material for subsequent use;

(2) Mixing and stirring: Put the prepared dredged silt, cement, gypsum, slag, fly ash, lime and early strength agent into the self-propelled mixer by manual feeding or automatic mechanical feeding, and mix and stir for 20 to 30 minutes ,well mixed;

(3) brick adobe: the mixed material obtained in the step (2) is evenly and densely placed in the brick mold, and the surface treatment is smooth;

(4) Form removal: place the brick mold on a horizontal surface and let it stand for 8 to 12 hours. After the brick is hardened, disassemble the mold and take out the finished brick;

(5) Curing: Place the prepared brick adobe at 20-25°C and 80-100% humidity for 10-28 days, and then you can make non-burning and pressure-free mud bricks.

The silt bricks prepared by the method of the invention can be used as filling foundations, laying roadbeds on both sides of roads, laying landscape river courses and the like.

Beneficial effect

Compared with the prior art, the present invention has the following beneficial effects:

(1) The present invention adopts non-sintering technology, which can save energy and avoid air pollution and solid waste pollution caused by calcination;

(2) The present invention adopts pressure-free technology, without pressure molding, and the production process does not require excessive power input;

(3) The dredging silt used in the present invention does not need to be dehydrated, and the operation is simple and easy;

(4) The production process of the present invention is simple, does not need steam curing, uses less machinery, invests less, and consumes less energy;

(5) The present invention uses dredging silt to produce brick masonry materials, which can not only dredge river courses, beautify water areas, but also turn waste into wealth and realize the recycling of resources.

Description of drawings

Fig. 1 is a process flow diagram of a method for preparing a non-burning and pressure-free mud brick according to the present invention.

detailed description

Example 1

A fire-free and pressure-free silt brick is made of the following components in mass fraction ratio: 82% of dredged silt, 12% of cement, 4% of fly ash, and 2% of gypsum. Among them, the dredged silt is the silt directly cleared from Lianyungang Port, without dehydration treatment, and its moisture content is 86%.

The cement is Conch brand composite Portland cement with a cement strength of 42.5.

The gypsum powder is gypsum powder for construction.

A method for preparing fire-free and pressure-free mud bricks, comprising the following steps:

(1) Raw material preparation: get the dredged silt to measure the water content, select the dredged silt with a water content of 86% for subsequent use;

(2) Mixing and stirring: Put the prepared dredging silt, cement, fly ash and gypsum into the self-contained mixer by manual feeding, mix and stir for 30 minutes, and mix evenly;

(3) brick adobe: the mixed material obtained in the step (2) is evenly and densely filled in a standard brick mold of 240mm * 115mm * 53mm, and the surface treatment is smooth, and the weight of each brick is controlled at 2.4kg;

(4) Form removal: place the brick mold on a horizontal surface and let it stand for 8 hours. After the brick is hardened, disassemble the mold and take out the finished brick;

(5) Curing: Place the prepared bricks at 20°C and 80% humidity for 10 days to make unfired and pressure-free mud bricks.

Example 2

A fire-free and pressure-free silt brick is made of the following components in mass fraction ratio: 82% of dredged silt, 15% of cement, 1% of lime and 2% of gypsum. Among them, the dredged silt is the silt directly cleared from Lianyungang Port, without dehydration treatment, and its moisture content is 55%.

The cement is Conch brand composite Portland cement with a cement strength of 42.5.

The lime is powdered quicklime obtained by grinding block quicklime and sieving.

A method for preparing fire-free and pressure-free mud bricks, comprising the following steps:

(1) Raw material preparation: get the dredged silt to measure the water content, select the dredged silt with a water content of 55% for subsequent use; grind the massive quicklime, pass through a sieve with an aperture of 2mm, and obtain the powdery quicklime material for subsequent use;

(2) Mixing and stirring: Put the prepared dredged silt, cement, lime and gypsum into the self-propelled mixer by manual feeding or mechanical automatic feeding, and mix and stir for 20 minutes until they are evenly mixed;

(3) brick adobe: the mixed material obtained in the step (2) is evenly and densely filled in a standard brick mold of 240mm * 115mm * 53mm, and the surface treatment is smooth, and the weight of each brick is controlled at 2.4kg;

(4) Form removal: place the brick mold on a horizontal surface and let it stand for 12 hours. After the brick is hardened, disassemble the mold and take out the finished brick;

(5) Curing: Place the prepared bricks at 22°C and 100% humidity for 28 days to make unfired and pressure-free mud bricks.

Example 3

A non-burning and pressure-free silt brick is made of the following components in mass fraction ratio: 82% of dredged silt, 8% of cement, 2% of gypsum, and 8% of slag.

Among them, the dredged silt is the silt directly cleared from Lianyungang Port, without dehydration treatment, and its moisture content is 62%.

The cement is composite Portland cement or ordinary Portland cement, and the cement strength is not lower than 42.5.

The gypsum is construction gypsum powder.

The slag is the molten material obtained when the blast furnace smelts pig iron, and is quenched and granulated into active granulated blast furnace slag, and then dried and ground to obtain slag powder, and its main components include silicate and aluminosilicate .

A method for preparing fire-free and pressure-free mud bricks, comprising the following steps:

(1) Raw material preparation: take the dredged silt to measure the moisture content, and select the dredged silt with a moisture content of 62% for use; the molten material with silicates and aluminosilicates as the main components produced when the blast furnace smelts pig iron is quenched , drying, grinding and sieving to prepare active granulated blast furnace slag powder;

(2) Mixing and stirring: Put the prepared dredged silt, cement, gypsum and slag into the self-propelled mixer by manual feeding or automatic mechanical feeding, and mix and stir for 25 minutes until they are evenly mixed;

(3) brick adobe: the mixed material obtained in the step (2) is evenly and densely placed in the brick mold, and the surface treatment is smooth;

(4) Form removal: place the brick mold on a horizontal surface and let it stand for 10 hours. After the brick is hardened, disassemble the mold and take out the finished brick;

(5) Curing: Place the prepared bricks at 23°C and 90% humidity for 22 days to make unfired and pressure-free mud bricks.

Example 4

A fire-free and pressure-free silt brick is made of the following components in mass fraction ratio: 82% of dredged silt, 4% of cement, 2% of gypsum, and 12% of slag.

Among them, the dredged silt is the silt directly cleared from Lianyungang Port, without dehydration treatment, and its moisture content is 68%.

The cement is composite Portland cement or ordinary Portland cement, and the cement strength is not lower than 42.5.

The gypsum is construction gypsum powder.

The slag is the molten material obtained when the blast furnace smelts pig iron, and is quenched and granulated into active granulated blast furnace slag, and then dried and ground to obtain slag powder, and its main components include silicate and aluminosilicate .

A method for preparing fire-free and pressure-free mud bricks, comprising the following steps:

(1) Raw material preparation: get the dredged silt to measure the water content, select the dredged silt with a water content between 68% for subsequent use; produce the melt with silicate and aluminosilicate as the main components when the blast furnace smelts pig iron, after Active granulated blast furnace slag powder is prepared by quenching, drying, grinding and sieving;

(2) Mixing and stirring: Put the prepared dredged silt, cement, gypsum and slag into the self-propelled mixer by manual feeding or automatic mechanical feeding, and mix and stir for 25 minutes until they are evenly mixed;

(3) brick adobe: the mixed material obtained in the step (2) is evenly and densely placed in the brick mold, and the surface treatment is smooth;

(4) Form removal: place the brick mold on a horizontal surface and let it stand for 9 hours. After the brick is hardened, disassemble the mold and take out the finished brick;

(5) Curing: Place the prepared bricks at 24°C and 85% humidity for 25 days to make unfired and pressure-free mud bricks.

Example 5

A fire-free and pressure-free silt brick is made of the following components in mass proportion: 81% of dredged silt, 16% of cement, 2% of gypsum, and 1% of early strength agent.

Among them, the dredged silt is the silt directly cleared from Lianyungang Port, without dehydration treatment, and its moisture content is 72%.

The cement is composite Portland cement or ordinary Portland cement, and the cement strength is not lower than 42.5.

The gypsum is construction gypsum powder.

The content of the accelerator is pure substance content.

A method for preparing fire-free and pressure-free mud bricks, comprising the following steps:

(1) Raw material preparation: get the dredged silt to measure the water content, select the dredged silt with the water content between 72% for subsequent use;

(2) Mixing and stirring: Put the prepared dredged silt, cement, gypsum and early strength agent into the self-propelled mixer by manual feeding or automatic mechanical feeding, and mix and stir for 30 minutes until they are evenly mixed;

(3) brick adobe: the mixed material obtained in the step (2) is evenly and densely placed in the brick mold, and the surface treatment is smooth;

(4) Form removal: place the brick mold on a horizontal surface and let it stand for 12 hours. After the brick is hardened, disassemble the mold and take out the finished brick;

(5) Curing: Place the prepared bricks at 25°C and 85% humidity for 18 days to make unfired and pressure-free mud bricks.

Example 6

A fire-free and pressure-free silt brick is made of the following components in mass proportion: 82% of dredged silt, 12% of cement, 2% of gypsum, and 4% of lime.

Among them, the dredged silt is the silt directly cleaned from Lianyungang Port, without dehydration treatment, and its moisture content is 80%.

The cement is composite Portland cement or ordinary Portland cement, and the cement strength is not lower than 42.5.

The gypsum is construction gypsum powder.

The lime is powdered quicklime obtained by grinding block quicklime and sieving.

A method for preparing fire-free and pressure-free mud bricks, comprising the following steps:

(1) Raw material preparation: get the dredged silt to measure the water content, select the dredged silt with a water content between 72% for subsequent use; grind the massive quicklime, pass through a sieve with an aperture of 2mm, and obtain the powdery quicklime material for subsequent use;

(2) Mixing and stirring: Put the prepared dredged silt, cement, gypsum and lime into the self-propelled mixer by manual feeding or mechanical automatic feeding, and mix and stir for 30 minutes until they are evenly mixed;

(3) brick adobe: the mixed material obtained in the step (2) is evenly and densely placed in the brick mold, and the surface treatment is smooth;

(4) Form removal: place the brick mold on a horizontal surface and let it stand for 12 hours. After the brick is hardened, disassemble the mold and take out the finished brick;

(5) Curing: Place the prepared bricks at 25°C and 85% humidity for 25 days to make unfired and pressure-free mud bricks.

The various physical parameters of the silt bricks prepared in Examples 1 to 6 are detected, and the results are shown in the table below:

The present invention is tested and verified repeatedly, and satisfactory effect has been obtained. The ratio of materials in the present invention, that is, the proportion of dredging silt, cement, gypsum, slag, fly ash, lime and early strength agent and related process parameters can be flexibly combined within the given range.

Claims (3)

1. A fire-free and pressure-free silt brick, characterized in that it is made of the following components in mass fraction ratio: 70-85% of dredging silt, 5-20% of cement, 2-7% of gypsum, 0-7% of slag 20%, fly ash 0~20%, lime 0~10%, early strength agent 0~1%; the water content of the dredged silt is 55~86%; the non-burning and pressure-free silt brick is made by the following method Obtained: (1) Raw material preparation: take the dredged silt to measure the water content, select the dredged silt with a water content between 55% and 86% for later use; use silicate and aluminosilicate as the main components produced during blast furnace smelting pig iron The molten material is quenched, dried, ground and sieved to prepare active granulated blast furnace slag powder; the lump quicklime is ground and passed through a sieve with an aperture of 2mm to obtain powdery quicklime for later use; (2) mixing and stirring: Put the prepared dredged silt, cement, gypsum, slag, fly ash, lime and early strength agent into the self-propelled mixer by manual feeding or mechanical automatic feeding, and mix for 20 to 30 minutes until evenly mixed; (3) Brick making: Place the mixed material obtained in step (2) evenly and densely in the brick mold, and make the surface smooth; (4) Remove the mold: place the brick mold on a horizontal surface and let it stand for 8 to 12 hours. After the brick is hardened, disassemble the abrasive tool and take out the finished brick; (5) Curing: place the finished brick at 20-25°C and 80-100% humidity for 10-28 days to make a free Fired pressure-free silt bricks. 2. The non-burning and pressure-free silt brick according to claim 1, wherein the cement is composite Portland cement or ordinary Portland cement, and the cement strength is not less than 42.5. 3. The non-burning and pressure-free mud brick according to claim 1, wherein the gypsum is construction gypsum powder.