CN102887670A - Production method of light foamed concrete block - Google Patents

Abstract

The invention relates to a production method of a light foamed concrete block. According to the production method, a sulfonated water reducer, a methylsilane water-blocking agent and a lignosulfonate enhancer are used for preparing the concrete block, so that the usage amount of cement is obviously reduced, the usage amount of fly ash is increased, and the purposes of light foaming and thermal insulation are achieved. The light foamed concrete block is specifically prepared by the following components in percentage by weight: 15-20% of cement, 30-40% of fly ash, 30-40% of aggregate, 0.2-1.0% of sulfonated water reducer, 5-10% of methyl silicone oil water-based water-blocking agent, 3-5% of lignosulfonate, and an appropriate amount of foaming agent. The light foamed concrete block prepared according to the proportion is high in compressive strength, has a thermal conductivity of 0.08-0.09w/m.K, and can be prepared into blocks with arbitrary density.

Description

A kind of production method of light foaming concrete building block

Under the field: the invention belongs to building material, specifically the present invention relates to a kind of lightweight, high-strength and have a production method of the foamed concrete bearing building block of heat insulating effect.

Prior art: since country issues an order against production and uses the vitrified bond common brick, the scientific research personnel just with the non-clay building block as research direction, so name is planted non-sintering cement works goods and is emerged in multitude, comprising: cement standard brick, hollow cement block, cement wall plate etc., straight must propose be: although cement products has advantage, but also there is inevitable shortcoming, that is exactly that the weight ratio tradition common brick of cement standard brick weighs 1/3, its contract with dry rate is large, rigidity absorbs water by force and not is difficult to mutually combine, when causing the phenomenon of cracking uneven in temperature and occur.In recent years developed again light foaming concrete building block and wallboard, this light-weight wall material and building block are applicable to Highrise buildings, and certain bearing capacity (ultimate compression strength≤5MPa), weight≤1000kg/m are arranged ³The good news is that more current product not merely only uses cement, for save energy and environmental requirement, reduced cement consumption, added in a large number flyash, slag, phosphogypsum, sulphur gypsum etc. and thought in the past the material of waste product, greatly saved cement and turn waste into wealth.

When exploitation light-weight foam materials for wall, what generally run into is that permeability rate is high, and intensity does not reach requirement, and cement consumption is high in the concrete (usually occupies 30～40% ratio, do not meet environmental requirement.Invention disclosed patent 200710019454.3 discloses a kind of method with the enhancing by polymer concrete aerated blocks: cement 300～310 (accounting for 30%), dry sand 600, flyash 90～95, water-holding agent 2, re-dispersible glue powder 20, water reducer 2～3, the shortcoming of patent is that cement consumption is too high, the rubber powder price eighteenth of the twenty is expensive, and density is excessive; The patent No.: 200810072390.8 disclose and have a kind ofly added the light block that whipping agent is made with haydite and cement, flyash, and wherein cement consumption has reduced, but has increased haydite, this haydite still adopts sintering process production, power consumption is polluted, and intensity is also unlike strong as described in the patent; The patent No.: 03126595.2 title " concrete segment " is used river sand, the load-bearing concrete building block of cement blowing agent production will be adopted high pressure (1MPa) steam-cured 8 hours, initial stage normal temperature (30～50 ℃) maintenance 8～12 hours, visible energy consumption is quite high.

Although the present invention utilizes cement as sizing material, sand and flyash are as aggregate and filler, at operation and water reducer, larger improvement has been done in the aspects such as waterproofing agent, thereby cement consumption is greatly reduced, and steam-cured pressure and temperature reduces, and service time shortens.

According to the many-side research to water reducer: it is considered herein that not to be that any water reducer all is fit to be used as the additive of foam concrete block, the additive that is suitable as foamed concrete of mentioning among the present invention be the sulfonated type water reducer: such as the EPN high efficiency water reducing agent---this is a kind of water reducer of making through sulfonation with waste polystyrene foam.Addition is 0.5～1.2% of cement amount, namely 0.2～1.0% of total amount, cement consumption reduces to 15～20%, not chloride ion-containing to reinforcing bar without corrosive nature; Another kind is the condenses of sulfonated acetone and formaldehyde, can make the intensity of cement improve 15～20%, as seen adds the sulfonated type water reducer and just can reach the effect that reduces cement consumption and increase concrete strength.It is 15～20% that the present invention uses EPN high efficiency water reducing agent or sulfonated acetone and formaldehyde condensation products (SAF high efficiency water reducing agent) cement consumption exactly; The water reducer consumption is 0.2～1.0%

The present invention is directed to the water-permeable of foam concrete block, increased the waterborne organic silicon waterproofing agent, such as dimethylsilane, methyl-monosilane etc. (general designation silicone oil); Consumption is 5～15%; Just can reach abundant resistance effect.

The present invention adopts Qi Tough of sulfonated lignin increase to be called toughener; Addition 3～5%;

Aspect production method: must grind by advanced road wheel for the flyash that uses, the best is the planetary type wheel mill, rolling speed is: 40～64 rev/mins, time is 5～10 minutes, purpose is to remove the floating dust that new and old flyash outside coats, increase its activity, can reduce pressure, temperature and steam-cured time for later high-temperature steam curing.Utilize prescription provided by the present invention as follows:

The title weight percent, %	The title weight percent, %	The title weight percent, %
			Cement 15～20%	Sand material 30～40%	Sulfonated lignin 3～5%
Flyash 30～40%	Sulfonated type water reducer 0,2～1.0	Methyl-silicone oil (alkane) 5～10%
			Whipping agent 0.5～1.5kg/m 3

Best proportioning is:

Cement: 20%; (425# silicate cement)

Flyash: 34%; (meeting GB1596-91)

Sand material: 37%; (meeting GB/T14684-2001) is by 0.01～0.2 granularity proportioning.

Methyl-silicone oil: 5%; (water-based)

Sulfonated type water reducer: 1%;

Sulfonated lignin 3%;

Whipping agent adds by production weight.

As one embodiment of the present of invention:

Make 800kg/m ³The method of light foaming concrete building block: first cement 160kg and flyash 272kg are put into the planetary type wheel mill and roll until cement and flyash fully mix with 40 rev/mins of speed, be about 5～8min, pour with sand 280kg that (standard of sand should meet: GB/T14684-2001 in the stirrer into, the flyash standard should meet GB1596-91) add entry 140kg pulp, stirring velocity 40～70 turns/min, about 8～10min; The raw material that adds simultaneously other: methyl-silicone oil (alkane), 40kg, sulfonated water reducing agent 8kg, sulfonated lignin 24kg etc. form mortar;

500g animal-type whipping agent is added 20kg water inflate with the foaming machine foaming, and pass in the mortar, pressure 0.5～0.8MPa, produce even bubble this moment in mortar, and constantly stir to stop ventilation about 20min, and discharge unnecessary gas,

The foaming mortar is slowly poured in the mould that scribbles releasing agent, natural curing 1～2 hour (shut-down operation below 5 ℃), piling after the demoulding advances autoclave, and vapor pressure is 1.1MPa, 90～105 ℃ of temperature, steam-cured 6～8 hours; Slowly decompression can obtain hard and high-intensity foaming lightweight concrete building block is arranged.

After the steam-cured dehydration, building block can reach 6 product, dry density 780～820kg/m ³Ultimate compression strength 〉=5MPa after 28 days; Thermal conductivity reaches 0.085W/mK

EPN high-efficiency sulfonation water reducer leading indicator: outward appearance: oyster white transparent liquid;

Concentration: 42%;

Relative density: 1.4;

Water-reducing rate: 15～20;

Air content :≤3%;

pH 7～9；

Presetting period: 60～90min;

SAF sulfonated acetone and formaldehyde condensation products water reducer: outward appearance: brown liquid:

Solid content: 〉=30%;

Water-reducing rate: 〉=12%;

Air content: 〉=3%;

Presetting period: 120min;

Reach enterprise's required standard by the aerated-block of this patent production or the building block quality of cutting type production.

Claims (5)

1. the production method of a light foaming concrete building block is comprised of cement, sand material, flyash, water reducer and whipping agent etc., it is characterized in that proportioning is cement: 15～20%; Flyash: 30～40%; Sand material: 30～40%; Sulfonated type water reducer: 0.2～1.0%; Toughener is sulfonated lignin: 3～5%; Waterproofing agent is methyl-silicone oil (alkane) 5～10%

2. according to claim 1, it is characterized in that: flyash should roll in wheel roller before feeding intake, in order to remove the floating dust on raw material surface, made it to activate.

3. said water reducer according to claim 1 is characterized in that: be the sulfonated type water reducer.

4. according to claim 1,3 said water reducers is characterized in that: should be the SAF high efficiency water reducing agent that the EPN high efficiency water reducing agent made of useless granular polystyrene or sulfonated acetone and formaldehyde condensation products are made.

5. according to claim 1, described toughener is characterized in that: be sulfonated lignin, described waterproofing agent is aqueous dimethylformamide silicone oil (alkane), or water-based dimethyl silicone oil (alkane).