CN103641393A - Steam-press air-entrainment concrete self-heat conserving building block by using sand of Yellow River and preparation method - Google Patents

Steam-press air-entrainment concrete self-heat conserving building block by using sand of Yellow River and preparation method Download PDF

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CN103641393A
CN103641393A CN201310566105.9A CN201310566105A CN103641393A CN 103641393 A CN103641393 A CN 103641393A CN 201310566105 A CN201310566105 A CN 201310566105A CN 103641393 A CN103641393 A CN 103641393A
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yellow river
building block
river sand
steam
heat insulation
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CN103641393B (en
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司政凯
邓小成
董恒瑞
荣爱琴
曹林方
王安会
陈晓飞
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HENAN XIAN NEW BUILDING MATERIALS Co Ltd
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HENAN XIAN NEW BUILDING MATERIALS Co Ltd
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Abstract

The invention relates to a steam-press air-entrainment concrete self-heat conserving building block by using sand of Yellow River, which comprises the Yellow River sand and waste fly ash after the coal is burned in a power plant; the concrete self-heat conserving building block comprises the following components by weight percentage: 55-63% of the Yellow River sand, 5-16% of fly ash, 12.5-15% of quicklime, 2.5-3.0% of slaked lime, 1.0-2.0% of desulfurized gypsum, 0.08-0.12% of aluminum powder paste, 0.02-0.04% of foam stabilizer and the balance of cement. The building block takes the cheap Yellow River sand as a raw material, and has the advantages of light unit weight, strong processability, low heat conduction coefficient and good self-heat conserving effect.

Description

A kind of steam-pressing aero-concrete heat insulation building block prepared by Yellow River Sand and preparation method thereof that utilizes
Technical field
The invention belongs to construction material technical field, be specifically related to a kind of steam-pressing aero-concrete heat insulation building block prepared by Yellow River Sand and preparation method thereof that utilizes.
Background technology
From social energy consumption structure, industry, traffic and energy for building be three minutes world substantially.Whole world energy for building has reached 1/3 left and right of total energy consumption; And China's energy for building has also reached 1/4 left and right of national total energy consumption, and along with the raising of people's living standard progressively increases.In all building energy consumptions, the energy consumption proportion of buildings exterior-protected structure is larger.China's building energy conservation has been listed in programmatic document and the rigid index of building, its core is exactly to architectural exterior-protecting construction and heating system reform, carrying out building heat preservation is the Important Action of current energy-saving and emission-reduction and Sustainable development from now on, and its developing direction is self-heat conserving.The utilization of steam-pressing aero-concrete heat insulation building block produces numerous micro-bubbles and realizes heat-insulating property in concrete, but there is defect in various degree in most autoclaved aerated building block product: or heat insulation effect is up to standard but intensity is not high, or building block is prone to breakage, or construction is inconvenient, therefore can not get better applying.The above-mentioned condition of heat insulation building block causes so far most buildings still to adopt passively secondary insulation, after building is built up, carries out the light heat insulation materials such as outer subsides or plug-in plastic foamboard and adhesive polystyrene plate again, causes great in constructing amountly, and building cost is high.Therefore the high-performance heat insulation building block that, development unit weight, intensity and thermal conductivity meet the demands is simultaneously current problem demanding prompt solution.
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 to overcome the shortcoming of prior art, a kind of steam-pressing aero-concrete heat insulation building block that utilizes Yellow River Sand to prepare is provided, this building block be take cheap Yellow River Sand as raw material, has the advantages such as unit weight is light, workability is strong, thermal conductivity is low, and self-heat conserving is effective.
The present invention also provides the preparation method of above-mentioned steam-pressing aero-concrete heat insulation building block.
For achieving the above object, the present invention adopts following technical scheme:
A steam-pressing aero-concrete heat insulation building block that utilizes Yellow River Sand to prepare, it comprises that Yellow River Sand and power plant burn the waste flyash after coal; By weight percentage, this Self-heat-insulating concrete building block comprises the component of following proportioning: Yellow River Sand 55 ~ 63 %, flyash 5 ~ 16%, unslaked lime 12.5 ~ 15 %, white lime 2.5 ~ 3.0%, desulfurated plaster 1.0 ~ 2.0 %, 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 be not less than 65 %, organism not higher than 2.5 %, silt content not higher than 2.0 %, all refer to weight percent.
Described cement is PO 42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
Described suds-stabilizing agent can be for 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, guarantees that cast is stable.
The above-mentioned preparation method who utilizes steam-pressing aero-concrete heat insulation building block prepared by Yellow River Sand, it comprises the following steps:
1) Yellow River Sand is dry grinded and tailed over and be not more than 10 % to fineness 0.08 mm square hole sieve with ball mill; Unslaked lime, with after the fragmentation of jaw crusher difference, is tailed over to the powder that is not more than 1 % with ball mill grinding to fineness 0.08 mm square hole sieve;
2) flyash and levigate Yellow River Sand are added to water mix and blend (consumption of water think that 30 ~ 45% of Yellow River Sand weight is advisable), in whipping process, add white lime and desulfurated plaster, control slurry diffusibleness at 25 ~ 32mm, proportion is 1.45 ~ 1.60, temperature is at 38 ~ 45 ℃, stir speed (S.S.) is at 120 ~ 140 r/min, churning time 2 ~ 3 h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stirred, stir speed (S.S.) is 220 ~ 250 r/min, standby;
4) cement, calcium lime powder are joined to step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16 ~ 19cm, temperature is at 38 ~ 50 ℃, stir speed (S.S.) 600 ~ 700 r/min; And then add step 3) gained material stirring 30 ~ 60 s to pour into a mould, after cast, sending in the chamber of resting of 45 ~ 50 ℃ of temperature, humidity 55 ~ 60 % static maintenance 90 ~ 120 min to makes its multiviscosisty (indoorly be provided with xeothermic pipeline, steam passes in xeothermic pipeline, by dry heat pipe, dispel the heat and add warm air, temperature-stable in holding chamber);
5) static maintenance is carried out the demoulding, is cut the base substrate that obtains required specification after finishing; Then base substrate is sent to maintenance 0.5 ~ 1.5 h in the precuring chamber of 80 ~ 85 ℃ of temperature, humidity 60 ~ 95 %, after finishing, is transferred to and in autoclave, carries out steam-curedly, go out check after still, packaging and warehousing, natural curing 5 days finished product.
Preferably, the conservation system in autoclave is: in 2 ~ 2.5 h, air inlet is boosted and is warming up to 1.10 ~ 1.25 MPa, 175 ~ 190 ℃; Constant voltage constant temperature keeps after 8 ~ 10 h; Exhaust cooling step-down in 1.5 ~ 2 h.Further preferably, before increasing temperature and pressure, vacuumize in advance 30 ~ 50 min so that in still vacuum keep at ﹣ 0.06 ~ ﹣ 0.07 MPa.
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 the aluminium powder condition of getting angry; Cement mainly, in order to guarantee the stability of cast, is accelerated base substrate sclerosis, improves base substrate performance, avoids shrinking, and guarantees between the suitable quiet stopping time.
The present invention adopts desulfurated plaster as conditioning agent, can effectively suppress the multiviscosisty of condensing with slip of clearing up of unslaked lime, makes it to get angry consistent with aluminium powder; Add desulfurated plaster can also improve the intensity of base substrate and goods, improve the performances such as contraction, at the quiet stage CaSO that stops 4participate in to generate hydrated calcium aluminate sulfate and C-S-H gel, blank strength is improved, strengthen the ability that base substrate adapts to temperature stress and humidity stress when steam-cured.But the add-on of desulfurated plaster can not be too many, in order to avoid the getting angry of severe inhibition aluminium powder, in the present invention, desulfurated plaster consumption is 1.0 ~ 2.0%.
Aluminium powder cream as foaming agent, has been difficult for dirt, has not produced static, has not been afraid of and makes moist and have necessarily surely bubble effect, and for making slip form even air hole structure, aluminium powder cream tails over and is not more than 3 % and is advisable with 0.075 mm.
White lime in raw material is as thickening material and the levigate Yellow River Sand activity excitant in early stage, and adding of white lime can increase slurry denseness when 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 to produce with unslaked lime because making moist or second-rately making after treatment, can make so the defective and/or underproof unslaked lime of oxidation rate of digestion condition again utilize, and has saved cost.
Compared to the prior art, the advantage of steam-pressing aero-concrete heat insulation building block of the present invention:
1) using be regarded as siliceous solid waste Yellow River Sand as main siliceous material, be beneficial to yellow river regulation, improved husky enthusiasm for people's sand control, to protection of the environment, protection ecology play good action.
2) heat insulation building block of preparing gained has good physical and mechanical property and weather resistance (as light in unit weight, workability is strong etc.), and the thermal conductivity of product, lower than concerned countries standard, has good self-heat conserving performance.Can produce 05 grade, 06 grade, 07 grade heat insulation building block according to different proportionings and process system.
3) usining solid waste-Yellow River Sand replaces common natural sand to prepare air-entrained concrete building block as main siliceous material, raw materials for production have been expanded, gained gas concrete is except meeting the features such as general sand aerated concrete light weight, insulation, workability be strong, its thermal conductivity is low, meets the requirement of self-heat conserving.This building block belongs to green, energy-saving and environmental protection materials for wall, and added value of product is high, and the market competitiveness is strong.
For measuring the thermal property of heat insulation building block body of wall of the present invention, detect the Thermodynamic Criteria of 230 mm thick wall body (see figure 1)s, result is: supporting plastering mortar thermal conductivity λ is that 0.895 W/ (mK), steam-pressing aero-concrete heat insulation building block thermal conductivity λ are 0.11 W/ (mK), and wall total thermal resistance value R is 1.125 W/ (m 2k), Coefficient K is 0.889 W/ (m 2k).
Accompanying drawing explanation
Fig. 1 is the thermal property of heat insulation building block 230 mm thick wall bodies of the present invention;
Fig. 2 is 1 test block thermal conductivity curve of example;
Fig. 3 is 2 test block thermal conductivity curves of example;
Fig. 4 is 3 test block thermal conductivity curves of example;
Fig. 5 is 4 test block thermal conductivity curves of example.
Embodiment
By specific embodiment, technical scheme of the present invention is described below, but protection scope of the present invention is not limited to this.
embodiment 1:
A steam-pressing aero-concrete heat insulation building block that utilizes Yellow River Sand to prepare, comprises that Yellow River Sand and power plant burn the waste flyash after coal; By weight percentage, its component proportion is: Yellow River Sand 57%, flyash 16%, unslaked lime 12.5%, white lime 2.5%, desulfurated plaster 1.1 %, aluminium powder cream 0.12 %, Chinese honey locust powder 0.04 %, surplus is cement.SiO in described Yellow River Sand 2content be not less than 65 %, organism not higher than 2.5 %, silt content not higher than 2.0 %.Described cement is PO 42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
The above-mentioned preparation method who utilizes steam-pressing aero-concrete heat insulation building block prepared by Yellow River Sand, it comprises the following steps:
1) Yellow River Sand is dry grinded and tailed over and be not more than 10 % to fineness 0.08 mm square hole sieve with ball mill; Unslaked lime, with after jaw crushing crusher machine, is tailed over to the powder that is not more than 1 % with ball mill grinding to fineness 0.08 mm square hole sieve;
2) flyash and levigate Yellow River Sand are added to water mix and blend (consumption of water be Yellow River Sand weight 35%), in whipping process, add white lime and desulfurated plaster, control slurry diffusibleness at 30mm, proportion is 1.50, temperature is at 40 ℃, and stir speed (S.S.) is at 130 r/min, churning time 2 h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stirred, stir speed (S.S.) is 230 r/min, standby;
4) cement, calcium lime powder are joined to step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16 ~ 19cm, temperature is at 40 ℃, stir speed (S.S.) 650 r/min; And then add step 3) gained material stirring 45s to pour into a mould, after cast, sending in the chamber of resting of 48 ℃ of temperature, humidity 58 % static maintenance 100 min to makes its multiviscosisty (indoorly be provided with xeothermic pipeline, steam passes in xeothermic pipeline, by dry heat pipe, dispel the heat and add warm air, temperature-stable in holding chamber);
5) static maintenance is carried out the demoulding, is cut the base substrate that obtains required specification after finishing; Then base substrate is sent to maintenance 1 h in the precuring chamber of 82 ℃ of temperature, humidity 75 %, after finishing, is transferred to and in autoclave, carries out steam-curedly, go out check after still, packaging and warehousing, natural curing 5 days finished product.Wherein, the conservation system in autoclave is: vacuumize 40 min, make the interior vacuum keep of still at ﹣ 0.06 ~ ﹣ 0.07 MPa; Then in 2h, air inlet is boosted and is warming up to 1.2 MPa, 185 ℃; Constant voltage constant temperature keeps after 8h; Exhaust cooling step-down in 2 h.
Dry density with reference to the mensuration protective heat plate method > > test implementation example 1 gained autoclave aerated concrete building block of GB/T11969-2008 < < steam-pressing aero-concrete method for testing performance > > and GB/T10294-2008 < < Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics is 451 m 2/ kg, ultimate compression strength is 2.9 MPa, thermal conductivity is 0.09 W/ (mk).
embodiment 2:
A steam-pressing aero-concrete heat insulation building block that utilizes Yellow River Sand to prepare, comprises that Yellow River Sand and power plant burn the waste flyash after coal; By weight percentage, its component proportion is: Yellow River Sand 63%, flyash 5%, unslaked lime 13%, white lime 2.6%, desulfurated plaster 2.0 %, aluminium powder cream 0.11 %, tea saponin 0.02 %, surplus is cement.SiO in described Yellow River Sand 2content be not less than 65 %, organism not higher than 2.5 %, silt content not higher than 2.0 %.Described cement is PO 42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
The above-mentioned preparation method who utilizes steam-pressing aero-concrete heat insulation building block prepared by Yellow River Sand, it comprises the following steps:
1) Yellow River Sand is dry grinded and tailed over and be not more than 10 % to fineness 0.08 mm square hole sieve with ball mill; Unslaked lime, with after jaw crushing crusher machine, is tailed over to the powder that is not more than 1 % with ball mill grinding to fineness 0.08 mm square hole sieve;
2) flyash and levigate Yellow River Sand are added to water mix and blend, add white lime and desulfurated plaster in whipping process, control slurry diffusibleness at 26mm, proportion is 1.45, and temperature is at 38 ℃, and stir speed (S.S.) is at 120 r/min, churning time 3 h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stirred, stir speed (S.S.) is 220 r/min, standby;
4) cement, calcium lime powder are joined to step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16cm, temperature is at 38 ℃, stir speed (S.S.) 600 r/min; And then add step 3) gained material stirring 45s to pour into a mould, after cast, sending in the chamber of resting of temperature 45 C, humidity 55 % static maintenance 100 min to makes its multiviscosisty (indoorly be provided with xeothermic pipeline, steam passes in xeothermic pipeline, by dry heat pipe, dispel the heat and add warm air, temperature-stable in holding chamber);
5) static maintenance is carried out the demoulding, is cut the base substrate that obtains required specification after finishing; Then base substrate is sent to maintenance 1.5 h in the precuring chamber of 85 ℃ of temperature, humidity 80 %, after finishing, is transferred to and in autoclave, carries out steam-curedly, go out check after still, packaging and warehousing, natural curing 5 days finished product.Wherein, the conservation system in autoclave is: vacuumize 40 min, make the interior vacuum keep of still at ﹣ 0.06 ~ ﹣ 0.07 MPa; Then in 2 h, air inlet is boosted and is warming up to 1.25 MPa, 178 ℃; Constant voltage constant temperature keeps after 10 h; Exhaust cooling step-down in 2 h.
Dry density with reference to the mensuration protective heat plate method > > test implementation example 2 gained autoclave aerated concrete building blocks of GB/T11969-2008 < < steam-pressing aero-concrete method for testing performance > > and GB/T10294-2008 < < Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics is 504 m 2/ kg, ultimate compression strength is 3.3 MPa, thermal conductivity is 0.10 W/ (mk).
embodiment 3:
A steam-pressing aero-concrete heat insulation building block that utilizes Yellow River Sand to prepare, comprises that Yellow River Sand and power plant burn the waste flyash after coal; By weight percentage, its component proportion is: Yellow River Sand 58%, flyash 6%, unslaked lime 13.5%, white lime 2.7%, desulfurated plaster 1.6 %, aluminium powder cream 0.09 %, pull open powder 0.03 %, surplus is cement.SiO in described Yellow River Sand 2content be not less than 65 %, organism not higher than 2.5 %, silt content not higher than 2.0 %.Described cement is PO 42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
The above-mentioned preparation method of steam-pressing aero-concrete heat insulation building block prepared by Yellow River Sand that utilizes is with reference to embodiment 1.
Dry density with reference to the mensuration protective heat plate method > > test implementation example 3 gained autoclave aerated concrete building blocks of GB/T11969-2008 < < steam-pressing aero-concrete method for testing performance > > and GB/T10294-2008 < < Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics is 594 m 2/ kg, ultimate compression strength is 4.2 MPa, and drying shrinkage value is 0.3 mm/m, and frost resistance mass loss is 1.6 %, and thermal conductivity is 0.11 W/ (mk).
embodiment 4:
A steam-pressing aero-concrete heat insulation building block that utilizes Yellow River Sand to prepare, comprises that Yellow River Sand and power plant burn the waste flyash after coal; By weight percentage, its component proportion is: Yellow River Sand 56%, flyash 12%, unslaked lime 15%, white lime 3.0%, desulfurated plaster 1.0%, aluminium powder cream 0.08 %, Chinese honey locust powder 0.02 %, surplus is cement.SiO in described Yellow River Sand 2content be not less than 65 %, organism not higher than 2.5 %, silt content not higher than 2.0 %.Described cement is PO 42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
The above-mentioned preparation method of steam-pressing aero-concrete heat insulation building block prepared by Yellow River Sand that utilizes is with reference to embodiment 2.
Dry density with reference to the mensuration protective heat plate method > > test implementation example 4 gained autoclave aerated concrete building blocks of GB/T11969-2008 < < steam-pressing aero-concrete method for testing performance > > and GB/T10294-2008 < < Technology of Steady State Thermal Resistance of Thermal Insulating Material and related characteristics is 633 m 2/ kg, ultimate compression strength is 5.9 MPa, and drying shrinkage value is 0.37 mm/m, and thermal conductivity is 0.13 W/ (mk).

Claims (6)

1. a steam-pressing aero-concrete heat insulation building block that utilizes Yellow River Sand to prepare, is characterized in that: comprise that Yellow River Sand and power plant burn the waste flyash after coal; By weight percentage, this Self-heat-insulating concrete building block comprises the component of following proportioning: Yellow River Sand 55 ~ 63 %, flyash 5 ~ 16%, unslaked lime 12.5 ~ 15 %, white lime 2.5 ~ 3.0%, desulfurated plaster 1.0 ~ 2.0 %, aluminium powder cream 0.08 ~ 0.12 %, suds-stabilizing agent 0.02 ~ 0.04 %, surplus is cement.
2. the steam-pressing aero-concrete heat insulation building block that utilizes as claimed in claim 1 Yellow River Sand to prepare, is characterized in that, SiO in described Yellow River Sand 2content be not less than 65 %, organism not higher than 2.5 %, silt content not higher than 2.0 %.
3. the steam-pressing aero-concrete heat insulation building block that utilizes as claimed in claim 1 Yellow River Sand to prepare, is characterized in that: described cement is PO 42.5 cement; Described aluminium powder cream is water aqua type aluminium powder cream.
4. the steam-pressing aero-concrete heat insulation building block that utilizes as claimed in claim 1 Yellow River Sand to prepare, is characterized in that: described suds-stabilizing agent is Chinese honey locust powder, pull open powder, tea saponin or soluble oil.
5. the preparation method of the arbitrary described steam-pressing aero-concrete heat insulation building block of claim 1 to 4, is characterized in that, comprises the following steps:
1) Yellow River Sand is dry grinded and tailed over and be not more than 10 % to fineness 0.08 mm square hole sieve with ball mill; Unslaked lime, with after jaw crushing crusher machine, is tailed over to the powder that is not more than 1 % with ball mill grinding to fineness 0.08 mm square hole sieve;
2) flyash and levigate Yellow River Sand are added to water mix and blend, in whipping process, add white lime and desulfurated plaster, control slurry diffusibleness at 25 ~ 32mm, proportion is 1.45 ~ 1.60, temperature is at 38 ~ 45 ℃, and stir speed (S.S.) is at 120 ~ 140 r/min, churning time 2 ~ 3 h;
3) aluminium powder cream and suds-stabilizing agent are added in aluminium powder stirred pot and stirred, stir speed (S.S.) is 220 ~ 250 r/min, standby;
4) cement, calcium lime powder are joined to step 2) stirring and evenly mixing in gained material, control slurry diffusibleness at 16 ~ 19cm, temperature is at 38 ~ 50 ℃, stir speed (S.S.) 600 ~ 700 r/min; And then add step 3) gained material stirring 30 ~ 60 s to pour into a mould, after cast, send static maintenance 90 ~ 120 min in the chamber of resting of 45 ~ 50 ℃ of temperature, humidity 55 ~ 60 % to and make its multiviscosisty;
5) static maintenance is carried out the demoulding, is cut the base substrate that obtains required specification after finishing; Then base substrate is sent to maintenance 0.5 ~ 1.5 h in the precuring chamber of 80 ~ 85 ℃ of temperature, humidity 60 ~ 95 %, after finishing, is transferred to and in autoclave, carries out steam-curedly, go out check after still, packaging and warehousing, natural curing 5 days finished product.
6. the preparation method of steam-pressing aero-concrete heat insulation building block as claimed in claim 5, is characterized in that: the conservation system in autoclave is: in 2 ~ 2.5 h, air inlet is boosted and is warming up to 1.10 ~ 1.25 MPa, 175 ~ 190 ℃; Constant voltage constant temperature keeps after 8 ~ 10 h; Exhaust cooling step-down in 1.5 ~ 2 h.
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CN105645991A (en) * 2016-01-05 2016-06-08 重庆建工新型建材有限公司 High-doping-amount furnace slag aerated concrete building block and preparation method thereof
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CN106242613A (en) * 2016-07-28 2016-12-21 河南兴安新型建筑材料有限公司 A kind of molybdic tailing, Yellow River Sand steam-pressing aero-concrete and preparation method thereof
CN107352871A (en) * 2017-07-29 2017-11-17 芜湖富创新型建材有限公司 A kind of production technology of air-entrained concrete building block
CN107602000A (en) * 2017-10-31 2018-01-19 广西中裕新型建材有限公司 A kind of high-strength light autoclave aerated concrete building block
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