CN106187295A - The powder ash air-entrained concrete building block of a kind of low heat conduction and production method - Google Patents

Abstract

The present invention relates to powder ash air-entrained concrete building block and the manufacture method of a kind of low heat conduction, using acidic silicasol with MTES as silicon source, add part water and ethanol, make MTES hydrolyze to form colloidal sol；Colloidal sol is mixed homogeneously with porous inorganic filling materials, and colloidal sol forms silicon wet gel in porous inorganic filling materials, obtains the filling porous inorganic filler of half-dried silica aerogel through overaging, the dry ethanol that removes；Cement, quick lime, Gypsum Fibrosum, flyash, half-dried silica aerogel are processed porous inorganic filling materials and be added to the water and stir, adds aluminium powder, bubble stabilizer and stir, pour into a mould, quiet stop, cut, steam press maintenance.The present invention is easy to operate, and cost of manufacture is low, by adding the modified porous filler that heat insulation effect is good in air entrained concrete, reduces the heat conductivity of air entrained concrete, improves the heat-insulating property of air entrained concrete.

Description

The powder ash air-entrained concrete building block of a kind of low heat conduction and production method

Technical field

The present invention relates to a kind of low heat conduction powder ash air-entrained concrete building block and production method, be to existing air entrained concrete The improvement of building block production method, relates to a kind of silica aerogel and processes the preparation method of inorganic porous filler air entrained concrete, belong to Construction material production technical field.

Background technology

According to GB 11968-2006 standard, B06 level powder ash air-entrained concrete building block (unit weight≤625kg/m³) intensity Requiring more than A3.5 level, i.e. mean intensity 3.5MPa, more than minimum strength 2.8MPa, heat conductivity is 0.16W/(m K) with Under.Tradition powder ash air-entrained concrete building block can not meet construction demand, and therefore, exploitation high intensity low conductive powder coal ash adds Gas concrete segment is significant.

CN201510900518.5 disclosed in Cai Zhuoli, use aluminium powder and detergent as the air-entrainment of concrete segment, Optimizing materials proportioning, reduces cost and can prepare intensity height, and do not collapse mould, the steam-pressing aero-concrete block that sound-insulating and heat-insulating effect is good Block.

CN201510479765.2 disclosed in Ke Runming, introduces modified microdilatancy precious in powder ash air-entrained concrete slip Zhu Yan, develop B05, B06 grade self-energy-saving microdilatancy perlite air-entrained concrete wall material, it is achieved 240mm standard thickness from energy-conservation Aerated concrete wall directly meets the requirement of energy-conservation more than 65%.

CN201510263913.7 disclosed in Wang Bihai, by straw, corn cob, cement, quick lime, Gypsum Fibrosum, aluminium powder, hydrogen-oxygen Change sodium, sodium carbonate and clear water, through pulverizing, stir, heat up pressurization, screen, pour, hot cell is quiet the step such as stop after be fabricated to fine coal Ash autoclaved aerated concrete block.

CN201310130284.1 disclosed in Yin Minggan, the invention discloses the preparation of a kind of glass bead air entrained concrete Method, crosses and adds the glass bead that heat insulation effect is good in air entrained concrete, reduce the heat conductivity of air entrained concrete, carry The high heat-insulating property of air entrained concrete, it is provided that good heat insulating and the high glass bead air entrained concrete of intensity.

Existing powder ash air-entrained concrete and add the air entrained concrete of various filler for proof strength, it is necessary to strengthen Unit weight, such as B05, B06 level powder ash air-entrained concrete, but heat insulation effect is poor, as heat conductivity is typically greater than 0.12W/ More than (m K) so that single aerated concrete wall material is difficult to meet energy-conservation 65% requirement, it more difficult to meet northern frore area The requirement of building energy conservation 75%.

Summary of the invention

The present invention provides a kind of low thermal-conductivity aerated concrete and production method thereof, is not reducing the same of air entrained concrete intensity Time, the heat conductivity of air entrained concrete is greatly lowered, thus significantly improves building heat preservation performance, overcome existing flyash and add The performance of gas concrete segment is not enough.

The powder ash air-entrained concrete building block of a kind of low heat conduction of the present invention, it is characterised in that be by following raw material by Ratio of weight and number is made:

Portland cement 10 parts, quick lime 20 parts, 10 parts of Gypsum Fibrosum, 70 parts of flyash, acidic silicasol 2.5 parts～5 parts, methyl three Ethoxysilane silicon 2.5 parts～5 parts, porous inorganic filling materials 20 parts～40 parts, aluminium powder 0.06 part, lauroylamidopropyl betaine 0.06 part；

Described porous inorganic filling materials is selected from: expanded perlite or glass bead.

The manufacture method of the powder ash air-entrained concrete building block of a kind of low heat conduction of the present invention, comprises the following steps:

1) acidic silicasol and MTES are added in 5 parts～10 parts of water and 20 parts～40 parts of ethanol solution, in At 50 DEG C, stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；Porous inorganic filling materials is loaded evacuation in vacuum still, by molten Glue is mixed uniformly, makes colloidal sol be sufficiently impregnated with in porous inorganic filling materials；Being sealed by material, at 50 DEG C, aging 48h, makes colloidal sol Silicon wet gel is formed in porous inorganic filling materials；Being dried 5h at 50 DEG C, removing ethanol obtains half-dried silica aerogel and fills many Hole inorganic filler；

2) weigh quick lime, flyash, portland cement and Gypsum Fibrosum, add 60 ~ 70 parts of water mixing and produce mixed slurry, add The porous inorganic filling materials that step 1) silica aerogel processes, stirring after adding aluminium powder and lauroylamidopropyl betaine, it is mixed to make Closing slip, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3), during mixed slurry is poured into mould, temperature of resting controls at 40～45 DEG C, and the 1.5h ~ 2.0h that rests becomes at the beginning of base substrate, base substrate Phase intensity reaches 0.6MPa；

4) carry out base substrate overturning demoulding substep cutting；

5) being delivered in still kettle by the base substrate after cutting, boost 100～130 minutes, pressure rises to 1.1～1.2MPa, temperature 175 DEG C～200 DEG C, starting constant voltage, constant voltage 5.0 ~ 6.0 hours, start blood pressure lowering, blood pressure lowering 100～130 minutes, pressure is down to 0, whole Individual steam press maintenance process 10h, to obtain final product.

The invention have the benefit that the precursor silicon sol solution by inorganic porous material absorption silica aerogel, shape Become to fill the inorganic porous particles of sol solution, join in air entrained concrete system, and then press through journey at aerated concrete steam The Silica Aerogels of the nanoaperture that middle formation heat conductivity is extremely low, preparation one is incubated than existing powder ash air-entrained concrete The low thermal-conductivity aerated concrete building block that effect is more excellent.By adding the silicon airsetting that heat insulation effect is good in air entrained concrete Glue, greatly reduces the heat conductivity of air entrained concrete, greatly improves the heat-insulating property of air entrained concrete, preferably solves The problem that existing air entrained concrete heat insulation effect of having determined is the best.The present invention is easy to operate, and cost of manufacture is low, it is provided that heat insulating ability The powder ash air-entrained concrete that energy is good and intensity is high.

Detailed description of the invention

Further illustrate the present invention by the following examples.

Embodiment 1:

1) 2.5kg acidic silicasol and 2.5kg MTES are added in 5kg water and 20kg ethanol solution, in 50 At DEG C, stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；20kg glass bead is loaded evacuation in vacuum still, by colloidal sol Mixed uniformly, make colloidal sol be sufficiently impregnated with in porous glass bead；Material is sealed, aging 48h at 50 DEG C, make colloidal sol exist Silicon wet gel is formed in porous glass bead；At 50 DEG C, it is dried 5h, removes ethanol and obtain half-dried silica aerogel filling vitreous Microballon；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the glass bead that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg dodecanamide propyl Stirring after glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3), during mixed slurry is poured into mould, temperature of resting controls at 40～45 DEG C, 1.5h～2.0h that rest becomes at the beginning of base substrate, base substrate Phase intensity reaches 0.6MPa；

4) carry out base substrate overturning demoulding substep cutting；

5) being delivered in still kettle by the base substrate after cutting, boost 100～130 minutes, pressure rises to 1.1～1.2MPa, temperature 175 DEG C～200 DEG C, starting constant voltage, constant voltage 5.0 ~ 6.0 hours, start blood pressure lowering, blood pressure lowering 100～130 minutes, pressure is down to 0, whole Individual steam press maintenance process 10h, to obtain final product.

The contrast groups of embodiment 1

Weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 65kg water and produce mixing Slip, adds 20kg glass bead, adds the system of stirring after 0.06kg aluminium powder and 0.06kg lauroylamidopropyl betaine Become mixed slurry, cast blanking, rest, cut, the technique such as steam pressure is with embodiment 1.

Embodiment 2:

1) 2.5kg acidic silicasol and 2.5kg MTES are added in 5kg water and 20kg ethanol solution, in 50 At DEG C, stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；40kg glass bead is loaded evacuation in vacuum still, by colloidal sol Mixed uniformly, make colloidal sol be sufficiently impregnated with in porous glass bead；Material is sealed, aging 48h at 50 DEG C, make colloidal sol exist Silicon wet gel is formed in porous glass bead；At 50 DEG C, it is dried 5h, removes ethanol and obtain half-dried silica aerogel filling vitreous Microballon；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the glass bead that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg dodecanamide propyl Stirring after glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3) rest, cut, steam pressure technique is with embodiment 1.

The contrast groups of embodiment 2

Weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 70kg water and produce mixing Slip, adds 40kg glass bead, adds the system of stirring after 0.06kg aluminium powder and 0.06kg lauroylamidopropyl betaine Become mixed slurry, cast blanking, rest, cut, the technique such as steam pressure is with embodiment 1.

Embodiment 3:

1) 5kg acidic silicasol and 5kg MTES are added in 10kg water and 40kg ethanol solution, at 50 DEG C Stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；20kg glass bead is loaded evacuation in vacuum still, by colloidal sol and its Mix homogeneously, makes colloidal sol be sufficiently impregnated with in porous glass bead；Material is sealed, aging 48h at 50 DEG C, make colloidal sol in porous Silicon wet gel is formed in glass bead；At 50 DEG C, it is dried 5h, removes ethanol and obtain half-dried silica aerogel filling glass bead；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the glass bead that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg dodecanamide propyl Stirring after glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3) rest, cut, steam pressure technique is with embodiment 1.

Embodiment 4:

1) 5kg acidic silicasol and 5kg MTES are added in 10kg water and 40kg ethanol solution, at 50 DEG C Stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；40kg glass bead is loaded evacuation in vacuum still, by colloidal sol and its Mix homogeneously, makes colloidal sol be sufficiently impregnated with in porous glass bead；Material is sealed, aging 48h at 50 DEG C, make colloidal sol in porous Silicon wet gel is formed in glass bead；At 50 DEG C, it is dried 5h, removes ethanol and obtain half-dried silica aerogel filling glass bead；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the glass bead that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg dodecanamide propyl Stirring after glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3) rest, cut, steam pressure technique is with embodiment 1.

Embodiment 5:

1) 2.5kg acidic silicasol and 2.5kg MTES are added in 5kg water and 20kg ethanol solution, in 50 At DEG C, stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；20kg expanded perlite is loaded evacuation in vacuum still, by molten Glue is mixed uniformly, makes colloidal sol be sufficiently impregnated with in porous expanded perlite；Material is sealed, aging 48h at 50 DEG C, make molten Glue forms silicon wet gel in expanded perlite；Being dried 5h at 50 DEG C, removing ethanol obtains half-dried silica aerogel and fills swollen Swollen perlite；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the expanded perlite that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg lauramide third Stirring after base glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3) rest, cut, steam pressure technique is with embodiment 1.

The contrast groups of embodiment 5

Weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 65kg water and produce mixing Slip, adds 20kg expanded perlite, adds 0.06kg aluminium powder and stirs after 0.06kg lauroylamidopropyl betaine Make mixed slurry, pour into a mould afterwards, rest, cut, the technique such as steam pressure is with embodiment 1.

Embodiment 6:

1) 2.5kg acidic silicasol and 2.5kg MTES are added in 5kg water and 20kg ethanol solution, in 50 At DEG C, stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；40kg expanded perlite is loaded evacuation in vacuum still, by molten Glue is mixed uniformly, makes colloidal sol be sufficiently impregnated with in porous expanded perlite；Material is sealed, aging 48h at 50 DEG C, make molten Glue forms silicon wet gel in expanded perlite；Being dried 5h at 50 DEG C, removing ethanol obtains half-dried silica aerogel and fills swollen Swollen perlite；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the expanded perlite that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg lauramide third Stirring after base glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3) rest, cut, steam pressure technique is with embodiment 1.

The contrast groups of embodiment 6

Weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 70kg water and produce mixing Slip, adds 40kg expanded perlite, adds 0.06kg aluminium powder and stirs after 0.06kg lauroylamidopropyl betaine Make mixed slurry, pour into a mould afterwards, rest, cut, the technique such as steam pressure is with embodiment 1.

Embodiment 7:

1) 5kg acidic silicasol and 5kg MTES are added in 10kg water and 40kg ethanol solution, at 50 DEG C Stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；20kg expanded perlite is loaded evacuation in vacuum still, by colloidal sol with Its mix homogeneously, makes colloidal sol be sufficiently impregnated with in porous expanded perlite；Material is sealed, aging 48h at 50 DEG C, make colloidal sol exist Silicon wet gel is formed in expanded perlite；At 50 DEG C, it is dried 5h, removes ethanol and obtain half-dried silica aerogel filling expansion treasure Zhu Yan；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the expanded perlite that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg lauramide third Stirring after base glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3) rest, cut, steam pressure technique is with embodiment 1.

Embodiment 8:

1) 5kg acidic silicasol and 5kg MTES are added in 10kg water and 40kg ethanol solution, at 50 DEG C Stirring hydrolyzes to form colloidal sol；PH5-7 is regulated with ammonia；40kg expanded perlite is loaded evacuation in vacuum still, by colloidal sol with Its mix homogeneously, makes colloidal sol be sufficiently impregnated with in porous expanded perlite；Material is sealed, aging 48h at 50 DEG C, make colloidal sol exist Silicon wet gel is formed in expanded perlite；At 50 DEG C, it is dried 5h, removes ethanol and obtain half-dried silica aerogel filling expansion treasure Zhu Yan；

2) weigh 20kg quick lime, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water and produce mixed Close slip, add the expanded perlite that step 1) silica aerogel processes, add 0.06kg aluminium powder and 0.06kg lauramide third Stirring after base glycine betaine and make mixed slurry, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3) rest, cut, steam pressure technique is with embodiment 1.

Blank group embodiment

By the 20kg quick lime of accurate measurement, 70kg flyash, 10kg portland cement and 10kg Gypsum Fibrosum, add the mixing of 60kg water Produce mixed slurry, add 0.06kg aluminium powder and 0.06kg lauroylamidopropyl betaine, stir afterwards, pour into a mould, rest, cut, The techniques such as steam pressure are with embodiment 1.

Tests below is provided to show to prove further the positive effect of the present invention

Embodiment 1-8, steam-cured after finished product place finished product stockyard after a week, take sample and carry out intensity, Density Detection, heat conductivity Detection, aggregative indicator is shown in Table 1.

The performance data of table 1 embodiment of the present invention 1-8

Performance indications	Embodiment 1	Example 1 contrast groups	Embodiment 2	Example 2 contrast groups	Embodiment 3	Embodiment 4	Embodiment 5	Example 5 contrast groups	Embodiment 6	Example 6 contrast groups	Embodiment 7	Embodiment 8	Blank group
														Density/kg/m3	464	450	420	406	439	405	460	448	415	410	432	400	600
Compressive strength/MPa	4.9	4.8	4.7	4.5	4.8	4.6	5.1	4.9	5.0	4.8	5.1	5.0	5.2
														Heat conductivity W/(m K)	0.097	0.14	0.090	0.12	0.083	0.074	0.10	0.14	0.091	0.13	0.086	0.076	0.16

Conclusion:

Embodiment 1～embodiment 4 are separately added into 2.5kg～5kg acidic silicasol and 2.5kg～5kg methyltriethoxy silane, Mix with 20kg or 40kg glass bead respectively, and then addition air entrained concrete system obtains goods.By during steam pressure Form silica aerogel, so that air entrained concrete heat conductivity has significantly reduction, from the 0.16W/(m K of blank group) drop to 0.074W/(m K).Embodiment 1 does not add silica aerogel in the contrast groups of embodiment 2, then more blank group of heat conductivity changes Kind inconspicuous.

Embodiment 5～embodiment 8 are separately added into 2.5kg～5kg acidic silicasol and 2.5kg～5kg methyl three ethoxy Base silicon, mixes with 20kg or 40kg expanded perlite respectively, and then obtains goods in addition air entrained concrete system.By in steam pressure During form silica aerogel, so that air entrained concrete heat conductivity has significantly reduction, from the 0.16W/(m of blank group K) 0.076W/(m K is dropped to).Embodiment 5 does not add silica aerogel in the contrast groups of embodiment 6, then heat conductivity is more empty White group is improved inconspicuous.

Micro analysis shows: glass bead or expanded perlite absorption silicon sol solution, joins fine coal after removing ethanol In ash aerated concrete, and then during steam pressure, form the nanovoids silica aerogel that heat insulation effect is splendid, thus prepare one Plant the low thermal-conductivity aerated concrete building block more excellent than existing powder ash air-entrained concrete heat insulation effect.Existing B06 level flyash Although air entrained concrete intensity is higher, but heat conductivity is the biggest so that single aerated concrete wall material is difficult to full Podomere energy 65% requirement, it more difficult to meet the requirement of northern frore area building energy conservation 75%.A kind of low heat conduction aerating coagulation of the present invention Soil and preparation method thereof, while not reducing air entrained concrete intensity, is greatly lowered the heat conductivity of air entrained concrete, from And significantly improve building heat preservation performance.Additionally, the present invention is easy to operate, cost of manufacture is low, it is provided that good heat insulating and intensity High powder ash air-entrained concrete.

Claims (2)

1. the powder ash air-entrained concrete building block of a low heat conduction, it is characterised in that be made up of following raw materials by weight portion ratio :

Portland cement 10 parts, quick lime 20 parts, 10 parts of Gypsum Fibrosum, 70 parts of flyash, acidic silicasol 2.5 parts～5 parts, methyl three Ethoxysilane silicon 2.5 parts～5 parts, porous inorganic filling materials 20 parts～40 parts, aluminium powder 0.06 part, lauroylamidopropyl betaine 0.06 part；

Described porous inorganic filling materials is selected from: expanded perlite or glass bead.

The manufacture method of the powder ash air-entrained concrete building block of a kind of low heat conduction the most according to claim 1, including following Step:

1) acidic silicasol and MTES are added in 5 parts～10 parts of water and 20 parts～40 parts of ethanol solution, in At 50 DEG C, stirring hydrolyzes to form colloidal sol；PH 5-7 is regulated with ammonia；Porous inorganic filling materials is loaded evacuation in vacuum still, by molten Glue is mixed uniformly, makes colloidal sol be sufficiently impregnated with in porous inorganic filling materials；Being sealed by material, at 50 DEG C, aging 48h, makes colloidal sol Silicon wet gel is formed in porous inorganic filling materials；Being dried 5h at 50 DEG C, removing ethanol obtains half-dried silica aerogel and fills many Hole inorganic filler；

2) weigh quick lime, flyash, portland cement and Gypsum Fibrosum, add 60 ~ 70 parts of water mixing and produce mixed slurry, add The porous inorganic filling materials that step 1) silica aerogel processes, stirring after adding aluminium powder and lauroylamidopropyl betaine, it is mixed to make Closing slip, pouring temperature controls, at 45 DEG C, to start to pour into a mould blanking；

3), during mixed slurry is poured into mould, temperature of resting controls at 40～45 DEG C, and the 1.5h ~ 2.0h that rests becomes at the beginning of base substrate, base substrate Phase intensity reaches 0.6MPa；

4) carry out base substrate overturning demoulding substep cutting；

5) being delivered in still kettle by the base substrate after cutting, boost 100～130 minutes, pressure rises to 1.1～1.2MPa, temperature 175 DEG C～200 DEG C, starting constant voltage, constant voltage 5.0 ~ 6.0 hours, start blood pressure lowering, blood pressure lowering 100～130 minutes, pressure is down to 0, whole Individual steam press maintenance process 10h, to obtain final product.