CN103664073B - A kind of autoclave aerated concrete building block utilizing Yellow River Sand to prepare and preparation method thereof - Google Patents
A kind of autoclave aerated concrete building block utilizing Yellow River Sand to prepare and preparation method thereof Download PDFInfo
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Abstract
The present invention relates to a kind of autoclave aerated concrete building block utilizing Yellow River Sand to prepare, it comprises the component of following weight per-cent: Yellow River Sand 60 ~ 70%, unslaked lime 16 ~ 23%, white lime 2.0 ~ 3.0%, desulfurated plaster 1.0 ~ 1.5%, aluminium powder cream 0.08 ~ 0.12%, suds-stabilizing agent 0.02 ~ 0.03%, surplus is cement.After raw material is made into slip, through cast, quietly stop maintenance, the demoulding, cutting, precuring, steam-cured obtained building block.This building block is with the Yellow River Sand of cheapness for raw material, and cost is lower and performance good, and production technique is simple.
Description
Technical field
The invention belongs to construction material technical field, be specifically related to a kind of autoclave aerated concrete building block utilizing Yellow River Sand to prepare and preparation method thereof.
Background technology
Autoclave aerated concrete building block is for main raw material with siliceous material and calcareous material, mix foaming agent, through the stirring that adds water, form hole by chemical reaction, the light porous new construction material made by technological processs such as casting, precuring cutting, steam press maintenances.Steam-pressing aero-concrete has concurrently: 1) unit weight is light, and its weight only has 1/3 of clay brick, 1/5 of normal concrete, is the desirable light material of high level, high-rise building and large spatial structure building; 2) good heat insulating, thermal conductivity are low, meet the requirement of modern architecture to wall thermal insulating; 3) workability is strong, and air-entrained concrete building block has good Young's modulus, can saw, digs, bores, follow closely, and field fabrication is strong, provides favourable condition to building operation.
In recent years, cement-lime-sand, cement-lime-flyash, the large serial steam-pressing aero-concrete product of cement-slag-sand three is well developed and is applied.But along with the raising year by year of flyash, sand price, finding cheap new raw material has become a kind of inevitable trend.
Summary of the invention
The object of the invention is the shortcoming overcoming prior art, provides a kind of autoclave aerated concrete building block utilizing Yellow River Sand to prepare, and this building block is with the Yellow River Sand of cheapness for raw material, and cost is lower and performance good.
Present invention also offers the preparation method of above-mentioned autoclave aerated concrete building block.
For achieving the above object, the present invention adopts following technical scheme:
Utilize an autoclave aerated concrete building block prepared by Yellow River Sand, it comprises the component of following weight per-cent: Yellow River Sand 60 ~ 70%, unslaked lime 16 ~ 23%, white lime 2.0 ~ 3.0%, desulfurated plaster 1.0 ~ 1.5%, aluminium powder cream 0.08 ~ 0.12%, suds-stabilizing agent 0.02 ~ 0.04%, surplus is cement.Said components sum is 100%.
Concrete, SiO in described Yellow River Sand
2content between 61 ~ 75%, organism not higher than 2.5%, silt content not higher than 2.0%, all refer to weight percent.
Described cement is PO42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
Described suds-stabilizing agent can be Chinese honey locust powder, pull open powder, tea saponin or solvable wet goods, in order to reduce bubble surface tension force, reinforces bubble chamber film physical strength, ensures that cast is stable.
The preparation method of the above-mentioned autoclave aerated concrete building block utilizing Yellow River Sand to prepare, it comprises the following steps:
1) dry grinding of the Yellow River Sand ball mill of water ratio less than 4% is tailed over to fineness 0.08mm square hole sieve be not more than 10%; By unslaked lime with after jaw crushing crusher machine, tail over the powder being not more than 1% to fineness 0.08mm square hole sieve with ball mill grinding;
2) add water levigate Yellow River Sand mix and blend (consumption of water thinks that 24 ~ 35% of Yellow River Sand weight are advisable), white lime and desulfurated plaster is added in whipping process, control slurry diffusibleness at 25 ~ 32mm, proportion is 1.48 ~ 1.60, temperature is at 38 ~ 45 DEG C, stir speed (S.S.) at 120 ~ 140r/min, churning time 2 ~ 3h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stir, stir speed (S.S.) is 200 ~ 250r/min, for subsequent use;
4) cement, calcium lime powder are joined step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16 ~ 19cm, temperature at 38 ~ 50 DEG C, stir speed (S.S.) 600 ~ 700r/min; And then add step 3) gained material stirring 30 ~ 60s and namely pour into a mould, send static maintenance 90 ~ 120min in the room of resting of temperature 45 ~ 50 DEG C, humidity 55 ~ 60% after cast to make its multiviscosisty (indoor are provided with dry heat tunnel, steam passes in dry heat tunnel, warm air is added, temperature-stable in holding chamber) by dry heat pipe heat radiation;
5) base substrate that the demoulding is carried out in static maintenance after terminating, cutting obtains required specification; Then base substrate is sent to maintenance 0.5 ~ 1.5h in the precuring room of temperature 80 ~ 85 DEG C, humidity 60 ~ 95%, is transferred to after terminating and carries out steam-cured in autoclave, go out inspection, packaging and warehousing after still, natural curing 5 days finished product.
Preferably, the conservation system in autoclave is: in 2 ~ 2.5h air inlet be warming up to 1.10 ~ 1.25MPa, 175 ~ 190 DEG C; After constant voltage constant temperature keeps 8 ~ 10h; Exhaust cooling step-down in 1.5 ~ 2h.Further preferably, before increasing temperature and pressure, vacuumize 30 ~ 50min in advance and remain on ﹣ 0.06 ~ ﹣ 0.07MPa to make vacuum tightness in still.
Under normal temperature condition, Yellow River Sand is generally considered as relatively stable factor on cast is stable, and lime and cement are considered as major influence factors as calcareous material.Lime can provide base substrate heat, meets aluminium powder and to get angry condition; Cement, mainly in order to ensure the stability of cast, is accelerated base substrate sclerosis, is improved body crack defects, avoids shrinking.
Add desulfurated plaster in the present invention, desulfurated plaster has higher grade, can replace the plaster of paris as conditioning agent, effectively can suppress the condensation multiviscosisty with slip of clearing up of unslaked lime, makes it to get angry with aluminium powder consistent; Add the intensity that desulfurated plaster can also improve base substrate and goods, improve the performances such as contraction, at static maintenance stage CaSO
4participate in generating hydrated calcium aluminate sulfate and C-S-H gel, blank strength is improved, strengthen the ability of temperature stress and humidity modification when base substrate adapts to steam-cured.But the add-on of desulfurated plaster can not be too many, suppress getting angry of aluminium powder in order to avoid serious, in the present invention, desulfurated plaster consumption is 1.0 ~ 1.5%.
Foaming agent adopts aluminium powder cream, and not easily play dirt, do not produce electrostatic, be not afraid of and make moist and have certain steady bubble effect, for making slip form even air hole structure, aluminium powder cream 0.075mm tails over and is not more than 3%.
White lime in raw material is used as the activity excitant in thickening material and levigate Yellow River Sand early stage, and adding of white lime can increase slurry denseness while not improving slurry temperature, and the levigate Yellow River Sand steady surface that is situated between is corroded in advance.This white lime can be production unslaked lime because making moist or second-rately obtaining after treatment, the defective and/or underproof unslaked lime of oxidation rate of digestion condition can be made so again to utilize, saved cost.
Compared to the prior art, the advantage of autoclave aerated concrete building block of the present invention:
1) to be regarded as the Yellow River Sand of silica solid waste as main siliceous material, reduce production cost, and be beneficial to yellow river regulation, improve the enthusiasm that people's sand control is husky, good action is played to protection of the environment, protecting ecology.
2) concrete segment preparing gained has good physical and mechanical property and weather resistance, and Product checking result shows the performance that its performance meets or exceeds traditional similar building block.05 grade, 06 grade, 07 grade concrete segment can be produced according to different ratio and process system.
3) Yellow River Sand is adopted to replace common natural sand to produce autoclave aerated concrete building block as siliceous material, raw materials for production are expanded, while meeting the features such as general gas concrete light weight, insulation and workability are strong, there is considerable economic benefit, economy of resources, ecological benefits, social benefit, added value of product is higher, and the market competitiveness is stronger.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention.
Embodiment
Below by way of specific embodiment, technical scheme of the present invention is described, but protection scope of the present invention is not limited thereto.
embodiment 1:
Utilize an autoclave aerated concrete building block prepared by Yellow River Sand, by weight percentage, its component proportion is: Yellow River Sand 70%, unslaked lime 16%, white lime 3.0%, desulfurated plaster 1.0%, aluminium powder cream 0.12%, Chinese honey locust powder 0.04%, and surplus is cement.SiO in described Yellow River Sand
2content between 61 ~ 75%, organism not higher than 2.5%, silt content is higher than 2.0%.Described cement is PO42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
The preparation method of the above-mentioned autoclave aerated concrete building block utilizing Yellow River Sand to prepare, it comprises the following steps:
1) dry grinding of the Yellow River Sand ball mill of water ratio less than 4% is tailed over to fineness 0.08mm square hole sieve be not more than 10%; After unslaked lime jaw crushing crusher machine, tail over the powder being not more than 1% to fineness 0.08mm square hole sieve with ball mill grinding;
2) add water levigate Yellow River Sand mix and blend (consumption of water is 30% of Yellow River Sand weight), adds white lime and desulfurated plaster in whipping process, controls slurry diffusibleness at 30mm, proportion is 1.50, temperature at 42 DEG C, stir speed (S.S.) at 130r/min, churning time 2.5h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stir, stir speed (S.S.) is 200r/min, for subsequent use;
4) cement, calcium lime powder are joined step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 19cm, temperature at 42 DEG C, stir speed (S.S.) 650r/min; And then add step 3) gained material stirring 45s and namely pour into a mould, send static maintenance 105min in the room of resting of temperature 47 DEG C, humidity 58% after cast to and make its multiviscosisty;
5) base substrate that the demoulding is carried out in static maintenance after terminating, cutting obtains required specification; Then base substrate is sent to maintenance 1h in the precuring room of temperature 83 DEG C, humidity 75%, is transferred to after terminating and carries out steam-cured in autoclave, go out inspection, packaging and warehousing after still, natural curing 5 days finished product.Wherein, the conservation system in autoclave is: vacuumize 40min, makes vacuum tightness in still remain on ﹣ 0.06 ~ ﹣ 0.07MPa; Then in 2h air inlet be warming up to 1.2MPa, 185 DEG C; After constant voltage constant temperature keeps 8h; Exhaust cooling step-down in 2h.
Dry density with reference to GB/T11969-2008 " steam-pressing aero-concrete method for testing performance " and GB/T10294-2008 " the mensuration Guarded hot plate of Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics " testing example 1 gained autoclave aerated concrete building block is 510m
2/ kg, ultimate compression strength is 3.1MPa, and drying shrinkage value is 0.45mm/m, and frost resistance mass loss is 1.5%, and thermal conductivity is 0.11W/ (mk).
embodiment 2:
Utilize an autoclave aerated concrete building block prepared by Yellow River Sand, by weight percentage, its component proportion is: Yellow River Sand 65%, unslaked lime 20%, white lime 2.5%, desulfurated plaster 1.1%, aluminium powder cream 0.11%, tea saponin 0.03%, and surplus is cement.SiO in described Yellow River Sand
2content between 61 ~ 75%, organism not higher than 2.5%, silt content is higher than 2.0%.Described cement is PO42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
The preparation method of the above-mentioned autoclave aerated concrete building block utilizing Yellow River Sand to prepare, it comprises the following steps:
1) dry grinding of the Yellow River Sand ball mill of water ratio less than 4% is tailed over to fineness 0.08mm square hole sieve be not more than 10%; After unslaked lime jaw crushing crusher machine, tail over the powder being not more than 1% to fineness 0.08mm square hole sieve with ball mill grinding;
2) add water levigate Yellow River Sand mix and blend, adds white lime and desulfurated plaster in whipping process, controls slurry diffusibleness at 28mm, proportion 1.52, temperature at 39 DEG C, stir speed (S.S.) at 125r/min, churning time 3h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stir, stir speed (S.S.) is 200r/min, for subsequent use;
4) cement, calcium lime powder are joined step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16cm, temperature at 42 DEG C, stir speed (S.S.) 650 ~ 700r/min; And then add step 3) gained material stirring 45s and namely pour into a mould, send static maintenance 97min in the room of resting of temperature 45 C, humidity 55 ~ 60% after cast to and make its multiviscosisty;
5) base substrate that the demoulding is carried out in static maintenance after terminating, cutting obtains required specification; Then base substrate is sent to maintenance 1h in the precuring room of temperature 85 DEG C, humidity 85%, is transferred to after terminating and carries out steam-cured in autoclave, go out inspection, packaging and warehousing after still, natural curing 5 days finished product.Wherein, the conservation system in autoclave is: vacuumize 40min, makes vacuum tightness in still remain on ﹣ 0.06 ~ ﹣ 0.07MPa; Then in 2h air inlet be warming up to 1.10MPa, 180 DEG C; After constant voltage constant temperature keeps 10h; Exhaust cooling step-down in 2h.
Dry density with reference to GB/T11969-2008 " steam-pressing aero-concrete method for testing performance " and GB/T10294-2008 " the mensuration Guarded hot plate of Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics " testing example 2 gained autoclave aerated concrete building block is 594m
2/ kg, ultimate compression strength is 4.3MPa, and drying shrinkage value is 0.4mm/m, and frost resistance mass loss is 1.2%, and thermal conductivity is 0.14W/ (mk).
embodiment 3:
Utilize an autoclave aerated concrete building block prepared by Yellow River Sand, by weight percentage, its component proportion is: Yellow River Sand 60%, unslaked lime 23%, white lime 2.5%, desulfurated plaster 1.5%, and aluminium powder cream 0.08% pulls open powder 0.02%, and surplus is cement.SiO in described Yellow River Sand
2content between 61 ~ 75%, organism not higher than 2.5%, silt content is higher than 2.0%.Described cement is PO42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
The preparation method of the above-mentioned autoclave aerated concrete building block utilizing Yellow River Sand to prepare, it comprises the following steps:
1) dry grinding of the Yellow River Sand ball mill of water ratio less than 4% is tailed over to fineness 0.08mm square hole sieve be not more than 10%; After unslaked lime jaw crushing crusher machine, tail over the powder being not more than 1% to fineness 0.08mm square hole sieve with ball mill grinding;
2) add water levigate Yellow River Sand mix and blend, adds white lime and desulfurated plaster in whipping process, controls slurry diffusibleness at 27mm, proportion 1.60, temperature at 38 DEG C, stir speed (S.S.) at 130r/min, churning time 2h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stir, stir speed (S.S.) is 250r/min, for subsequent use;
4) cement, calcium lime powder are joined step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16cm, temperature at 40 DEG C, stir speed (S.S.) 700r/min; And then add step 3) gained material stirring 45s and namely pour into a mould, send static maintenance 95min in the room of resting of temperature 45 C, humidity 55 ~ 60% after cast to and make its multiviscosisty;
5) base substrate that the demoulding is carried out in static maintenance after terminating, cutting obtains required specification; Then base substrate is sent to maintenance 1h in the precuring room of temperature 85 DEG C, humidity 85%, is transferred to after terminating and carries out steam-cured in autoclave, go out inspection, packaging and warehousing after still, natural curing 5 days finished product.Wherein, the conservation system in autoclave is: vacuumize 40min, makes vacuum tightness in still remain on ﹣ 0.06 ~ ﹣ 0.07MPa; Then in 2.5h air inlet be warming up to 1.20MPa, 187 DEG C; After constant voltage constant temperature keeps 8h; Exhaust cooling step-down in 2h.
Dry density with reference to GB/T11969-2008 " steam-pressing aero-concrete method for testing performance " and GB/T10294-2008 " the mensuration Guarded hot plate of Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics " testing example 3 gained autoclave aerated concrete building block is 634m
2/ kg, ultimate compression strength is 5.9MPa, and drying shrinkage value is 0.37mm/m, and thermal conductivity is 0.15W/ (mk).
Claims (2)
1. the preparation method of an autoclave aerated concrete building block, it is characterized in that, this concrete segment comprises the component of following weight per-cent: Yellow River Sand 60 ~ 70%, unslaked lime 16 ~ 23%, white lime 2.0 ~ 3.0%, desulfurated plaster 1.0 ~ 1.5%, aluminium powder cream 0.08 ~ 0.12%, suds-stabilizing agent 0.02 ~ 0.03%, surplus is cement; SiO in described Yellow River Sand
2content between 61 ~ 75%, organism not higher than 2.5%, silt content is higher than 2.0%; Comprise the following steps:
1) dry grinding of the Yellow River Sand ball mill of water ratio less than 4% is tailed over to fineness 0.08mm square hole sieve be not more than 10%; By unslaked lime, white lime with after jaw crusher respectively fragmentation, tail over the powder being not more than 1% to fineness 0.08mm square hole sieve with ball mill grinding;
2) add water the Yellow River Sand that ball milling is crossed mix and blend, adds dry hydrate and desulfurated plaster in whipping process, controls slurry diffusibleness at 25 ~ 32mm, proportion 1.48 ~ 1.60, temperature at 38 ~ 45 DEG C, stir speed (S.S.) at 120 ~ 140r/min, churning time 2 ~ 3h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stir, stir speed (S.S.) is 200 ~ 250r/min, for subsequent use;
4) cement, calcium lime powder are joined step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16 ~ 19cm, temperature at 38 ~ 50 DEG C, stir speed (S.S.) 600 ~ 700r/min; And then add step 3) gained material stirring 30 ~ 60s and namely pour into a mould, send static maintenance 90 ~ 120min in the room of resting of temperature 45 ~ 50 DEG C, humidity 55 ~ 60% after cast to and make its multiviscosisty;
5) base substrate that the demoulding is carried out in static maintenance after terminating, cutting obtains required specification; Then base substrate is sent to maintenance 0.5 ~ 1.5h in the precuring room of temperature 80 ~ 85 DEG C, humidity 60 ~ 95%, is transferred to after terminating and carries out steam-cured in autoclave, go out inspection, packaging and warehousing after still, natural curing 5 days finished product.
2. the preparation method of autoclave aerated concrete building block as claimed in claim 1, is characterized in that: the conservation system in autoclave is: in 2 ~ 2.5h air inlet be warming up to 1.10 ~ 1.25MPa, 175 ~ 190 DEG C; After constant voltage constant temperature keeps 8 ~ 10h; Exhaust cooling step-down in 1.5 ~ 2h.
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