CN105693178B - Quartzy Weathered Sand prepares the method for A3.5B05 level autoclave aerated concrete building blocks and its application on wall - Google Patents

Quartzy Weathered Sand prepares the method for A3.5B05 level autoclave aerated concrete building blocks and its application on wall Download PDF

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CN105693178B
CN105693178B CN201610057522.4A CN201610057522A CN105693178B CN 105693178 B CN105693178 B CN 105693178B CN 201610057522 A CN201610057522 A CN 201610057522A CN 105693178 B CN105693178 B CN 105693178B
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slurry
water
base substrate
cement
aerated concrete
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CN105693178A (en
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陈洁
陶加林
张晓东
钟颂
周宜
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Hubei Benefit Is Logical Builds Ltd Co
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Hubei Benefit Is Logical Builds Ltd Co
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    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
    • C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
    • C04B28/10—Lime cements or magnesium oxide cements
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
    • C04B40/02—Selection of the hardening environment
    • C04B40/024—Steam hardening, e.g. in an autoclave
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/20—Mortars, concrete or artificial stone characterised by specific physical values for the density
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/30—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values
    • C04B2201/32—Mortars, concrete or artificial stone characterised by specific physical values for heat transfer properties such as thermal insulation values, e.g. R-values for the thermal conductivity, e.g. K-factors
    • C—CHEMISTRY; METALLURGY
    • C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
    • C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
    • C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
    • C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Materials Engineering (AREA)
  • Structural Engineering (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Inorganic Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Curing Cements, Concrete, And Artificial Stone (AREA)

Abstract

The invention provides a kind of quartzy Weathered Sand to prepare the method for A3.5B05 level autoclave aerated concrete building blocks and its application on wall, is using quartzy Weathered Sand, cement, quick lime, industrial waste ardealite, aluminium powder cream and water as A3.5B05 levels high-performance autoclave aerated concrete building block made of raw material.Building block dry density 509kg/m3Cubic compressive strength average value 3.6MPa, single group minimum value 3.2Mpa, split pressure ratio 0.20, mass loss 2.8% after jelly, intensity 3.1Mpa after jelly, thermal conductivity factor (dry state) 0.1251W/ (mK), drying shrinkage value (standard law) 0.32mm/m, qualification rate ＞ 98%.Material handling procedures of the present invention are reasonable, and recipe calculation science, production procedure is succinct, reusable edible production waste material.The building block is applied on heat-preserving wall by the present invention.

Description

Quartzy Weathered Sand prepare A3.5B05 level autoclave aerated concrete building blocks method and its Application on wall
Technical field
The A3.5B05 levels autoclave aerated concrete building block prepared the present invention relates to a kind of quartzy Weathered Sand and its preparation side Method, belong to novel energy-saving environment-friendly materials for wall field.
Background technology
Quartzy Weathered Sand, it is that natural quartz is formed after weathering in millions upon millions of years, its former crystal habit converts, and becomes Tiny crystal grain, portions turn are noncrystal, and Main Ingredients and Appearance is silica (SiO2), contain small amounts aluminium (Al2O3), oxygen Change potassium (K2O), iron oxide (Fe2O3) and calcium oxide (CaO).Quartzy Weathered Sand is in autoclave aerated concrete building block production process master Act on and be to provide SiO2, its mineral constituent is complicated, content it is most be quartz, next to that feldspar, is also mingled with mica, carbonic acid Salt, clay etc., wherein also containing a number of Na2O and K2O, they generate soluble Na2SO4And K2SO4。
Influence of the clay impurity contained in quartzy Weathered Sand to autoclave aerated concrete building block performance is very big：On the one hand, Because clay is a kind of high dispersive material, water imbibition is strong, during too high levels, can increase phosphoric acid, if certain in order to ensure Viscosity and increase water consumption, then again extend base substrate firm time；On the other hand, a certain amount of Al is contained in clay2O3, it Promote the generation of steam-pressing aero-concrete hydrated product tobermorite (tobermorite) phase.
Tobermorite is the single-stranded layer structure formed with calcium oxide polyhedron of silicon-oxy tetrahedron, is contained between layer structure There is moisture, interlayer water unstable, easily dehydration cause volume contraction to deform.In order to obtain the excellent air entrained concrete of stable performance Product, it is necessary to be controlled by tobermorite.
At present, with the fast development of steam pressure sand aerated concrete block industry technology and equipment, produce in enormous quantities The ability of B06, B07 level autoclaved aerated building block has become ripe.But it can suit measures to local conditions, with reference to local physical condition high-volume, Gao He The steam pressurized coagulation building block of lattice rate production A2.0B04, A3.5B05 level, thin piece of building materials enterprise are seldom.Production A2.0B04, The Major Difficulties of A3.5B05 level autoclave aerated concrete building blocks are, while product unit weight is reduced, ensure that product is strong again Degree.The quality of B04, B05 level steam pressurized foam concrete quality directly affects self heat insulation wall and beams of concrete, post and shearing The cold-heat bridge such as wall position isothermal holding.
The content of the invention
A3.5B05 level steam pressures sand aerated concrete is prepared it is an object of the invention to provide one kind using quartzy Weathered Sand to build Block.By strictly controlling each raw material quality, match ratio and accurate measurement are adjusted, improves process, improves the stabilization of base substrate Property, ensure that steam pressure sand aerated concrete block air hole structure is good, unit weight is low, intensity is high, thermal conductivity factor and drying shrinkage value are low, anti- Jelly property is good.
To achieve the above object, the present invention adopts the following technical scheme that：
A3.5B05 level autoclave aerated concrete building blocks prepared by a kind of quartzy Weathered Sand, the concrete segment include as follows The dry material composition of parts by weight：Quartzy Weathered Sand 55-70 parts, cement 12-30 parts, quick lime 10-28 parts, aluminium powder cream 0.10- 0.13 part, ardealite 3-6 parts；Wherein, the dry material component of the concrete segment also includes water, and the mass ratio of water and dry material is 0.67-0.72:1。
The dry material of above-mentioned concrete segment is more preferably the dry material composition for including following parts by weight：Quartzy weathering 62.4 parts of sand, 19.5 parts of cement, 13.6 parts of quick lime, 0.12 part of aluminium powder cream, 4.38 parts of ardealite；Wherein, the concrete segment Dry material component also include water, the mass ratio of water and dry material is 0.68:1.
The present invention also provides a kind of method that quartzy Weathered Sand prepares A3.5B05 level autoclave aerated concrete building blocks, including Following preparation process：
1) quartzy Weathered Sand and ardealite are delivered to ball mill by weight after mixing, by water, useless slurry using flow-rate ratio as 7:1 adds ball mill, mix grinding 10-30min, obtains the slurry that fineness is 25-28%, mass percent concentration is 58-65%；Powder Broken and ball milling quick lime, obtain the calcium lime powder that fineness is 10%-13%；By water and aluminium powder cream using mass ratio as 8-10:1 is mixed Close, stirring obtains aluminium paste；
2) cement, calcium lime powder, slurry, water are added in agitator tank, mixing, 25-35s is stirred, using 0.3-0.4MPa Be steam heated to 30-35 DEG C, stop heating, aluminium paste added into agitator tank, after continuing stirring 35-40s, by agitator tank Slurry be discharged into it is framed in, and by it is framed feeding room temperature be 48-52 DEG C precuring it is interior it is quiet stop, slurry is in framed interior expansion, 40- Form stable base substrate after 48min, base substrate without sink, collapse, bubbling and phenomena such as bleeding, cut after the 170-190min that continues to rest Cut, remove the leftover pieces after base substrate cutting, base substrate is sent into still kettle；
3) steam press maintenance is carried out by distribution system to the base substrate in kettle, base substrate is in still kettle successively by vacuumizing, rising A3.5B05 level autoclave aerated concrete building blocks are obtained after pressure, constant pressure and decompression.
In described step 1), described fineness is dry material by quality shared by the screen over-size of 180 mesh standard inspection sieves Percentage.
In described step 1), described useless slurry is warp after the leftover pieces in step 2) after base substrate cutting enter recirculated water The density that stirring is formed is 1.2-1.3g/cm3Mixture, the main component of the mixture includes water, quartzy Weathered Sand and water Calcium hydroxide, the hydrated calcium silicate that calcium oxide hydration reaction is formed in silica, lime and cement that mud provides.
In described step 2), cement, calcium lime powder, slurry, water are added in agitator tank, mixing, stir 30s, are used 0.35MPa's is steam heated to 31 DEG C, stops heating, aluminium paste is added into agitator tank, continues after stirring 40s, by agitator tank Slurry be discharged into framed, by precuring that framed feeding room temperature is 50 DEG C it is interior it is quiet stop, slurry in framed interior expansion of getting angry, Form stable base substrate after 45min, base substrate without sink, collapse, the wild effect such as bubbling and bleeding, after the 185min that continues to rest Cutting, the leftover pieces after base substrate cutting are removed, base substrate is sent into still kettle.
In described step 3), after being vacuumized in still kettle, pressure is -0.03MPa in still kettle；It is defeated into still kettle again Steam is sent, 0MPa is risen in 10-15min；Continue to boost, 0.45MPa is risen in 50-70min；Further boosting, in 25- 0.8MPa is risen in 35min；Boost again, 1.32MPa is risen in 25-35min；Steam is supplemented into still kettle in time, is kept Pressure is 1.31-1.33MPa in kettle, maintains 6-7h；Then exhaust decompression, is depressurized to 1.0MPa in 25-35min；Further Exhaust decompression, is depressurized to 0.65MPa in 25-35min；Continue exhaust decompression, pressure in still kettle is down to normal pressure.
Above-mentioned middle cement is the Portland cements of PO 42.5, and the portland cement is in the preparation of concrete segment Being reacted rapidly after mainly meeting water, produce substantial amounts of hydrated calcium silicate gel, phosphoric acid increases guarantee pouring stability rapidly, Base substrate forms rear and accelerates the hardening of base substrate, is advantageous to cut.Cement is also CaO supplier simultaneously.
The digestion rate of quick lime is 8-15min/ DEG C, and digestion temperature is 75-85 DEG C, and A (CaO+MgO) mass fraction is 68-80%, the quick lime mainly provides effective CaO and heat in the preparation of concrete segment, to slurry densification and base The early strength of body plays an important role.Heat caused by effective CaO hydration reaction, aluminium cream is promoted to get angry.
Ardealite, the content of its calcium sulphate dihydrate is 70-78%, and the ardealite is mainly in the preparation of concrete segment Suppression to quick lime resolution, extend the slurry thickening time, slurry temperature is increased gentle, aluminium cream is got angry uniformly, is advantageous to base Body forms good air hole structure, can provide product strength within the specific limits.It is strong to also assist in hydrothermal synthesis reaction raising product Degree, shrinkage value is reduced, improve frost resistance.When dosage is excessive, easily causes slurry and be thickened slow and caused bubbling and sinking, even Collapse mould.
The content of silica is 80-90% in quartzy Weathered Sand, and the quartzy Weathered Sand is in the preparation of concrete segment Primarily serve and siliceous material and skeletal support effect, SiO are provided2Reacted with the CaO in lime and cement, in steam press maintenance condition It is lower to produce new hydrated product, autoclave aerated concrete building block is reached intensity requirement.
Aluminium powder cream plays foaming agent in the preparation of concrete segment.Metallic aluminium in aluminium cream is with water in alkaline environment Lower reaction produces hydrogen, and hydrogen forms nuclei of bubbles on aluminium cream fine grained surface, and bubble parameters promote slurry expansion, form certain body Long-pending base substrate.
Water is to carry out hydrothermal synthesis reaction and aluminium powder cream to get angry the important component of reaction, and is well mixed each raw material With the necessary medium for carrying out complex chemical reaction.Appropriate ratio of water to material makes slurry have suitable denseness and mobility, makes to get angry Smooth, base substrate obtains good air hole structure.
The autoclave aerated concrete building block dry density ＜ 525kg/m prepared by above-mentioned steps3, cubic compressive strength is average Value ＞ 3.5MPa, single group minimum value ＞ 2.8Mpa, split pressure ratio ＞ 0.16, mass loss ＜ 5.0% after jelly, intensity ＞ after jelly 2.8Mpa, thermal conductivity factor (dry state) ＜ 0.14W/ (mK), drying shrinkage value (standard law) ＜ 0.50mm/m, reach national standard GB11968-2006《Autoclave aerated concrete building block》The requirement of A3.5B05 level autoclave aerated concrete building blocks.Qualification rate ＞ 98%.
Had the advantages that using technical scheme
The present invention can high-volume, high qualification rate production A3.5B05 level autoclave aerated concrete building blocks.With existing aerating coagulation Autochthonal production. art is compared, and has following remarkable advantage.
1. the present invention adds the industrial waste ardealite and useless slurry mix grinding of suitable proportion in wet-milling slurrying.Addition industry Waste ardealite can effectively suppress the digestion reaction of quick lime, not only solve production quick lime because digestion rate is fast, disappears Change temperature height to cause the problem of unstable of getting angry, also alleviate the problem of trade waste comprehensive utilization to a certain extent.It is useless The incorporation of slurry and use mix grinding technique, overcome the problem of active low and its pulp viscosities of quartzy Weathered Sand are poor.
Useless slurry is that the waste material after Aerated concrete blank cutting stirs to be formed with water, and density domination is in 1.2~1.3g/cm3, Useless slurry is pumped into useless slurry tank by slurry and used for mix grinding slurrying.Because having higher basicity in useless slurry, and through for a long time After storage, each material has tentatively carried out hydration reaction, and number of gels is more.Mix grinding technique then makes partial material antedating response, has Hardened beneficial to base substrate, shorten the precuring time.
2. the present invention properly increases the fineness of slurry in mix grinding slurrying.The quartzy Weathered Sand SiO that the present invention uses2Content Up to 88.9%, 180 mesh sieve margins only 50~55%, clay content is up to 12%.Due to itself carefully collecting before making quartzy Weathered Sand ball milling Expect that content is more, specific surface area is big, SiO2Content is high, can guarantee that SiO2With CaO abundant reaction.If slurry fineness is relatively low, slurry Stickiness or denseness are excessive, and mobility is deteriorated, and expansion of getting angry is not smooth enough.
3. the present invention increases ratio of water to material, reduction pouring temperature in dispensing link.A3.5B05 level autoclave aerated concrete building blocks Relatively low with respect to B06, B07 level building block dry density, the dry material of unit volume is less, while to ensure that product reaches the strong of requirement Degree, should suitably increase calcium silicon ratio, generate more silico-calcium hydrated products.The increase of lime or cement cementitious material ratio, effectively Heat caused by CaO hydration reactions increases, and slurry bodying velocity is accelerated, and need to reduce warm-up time, reduces pouring temperature, reduces aluminium Cream raising rate.Ratio of water to material need to be increased simultaneously, suppress the thickening of slurry.Finally make slurry in expansion process of getting angry, speed of getting angry Degree is harmonious with bodying velocity, setting rate, and slurry is expanded into default volume, occurs without the mould that collapses, shrinks lower floor or bubbling Boiling phenomenon.
The present invention can significantly reduce product dry density, reduce thermal conductivity factor, improve intensity, strengthen frost resistance, reduce drying Shrinkage value, key are that production process determines the source material mixture ratio of suitable quartzy Weathered Sand, and by accurate measurement, control adds Hot temperature and mixing time, ensure the good stability of getting angry of slurry, and be expanded into the volume of setting, in the steam press maintenance of formulation Under the conditions of generate the hydrated calcium silicate and aquation calcium aluminosilicate crystallizable mineral of certain amount and form.
Brief description of the drawings
Fig. 1 is the process chart that quartzy Weathered Sand prepares A3.5B05 level autoclave aerated concrete building blocks.
Fig. 2,3,4 are the scanning for the examining report book that quartzy Weathered Sand prepares A2.0B04 level autoclave aerated concrete building blocks Part.
Embodiment
Quartzy Weathered Sand prepares A3.5B05 level autoclave aerated concrete building blocks, each raw-material weight percentage in total dry material Than：Cement 12~30%, quick lime 10~28%, quartzy Weathered Sand 55~70%, aluminium powder cream 0.10~0.13%, ardealite 3%~6%.Total water (comprising slurry is aqueous, external adding water, aluminium paste is aqueous, heating steam is aqueous) and total dry material ratio (water material Than) it is 0.67~0.72.Above-mentioned raw material stir by operating procedure, heat after, be cast into framed, precuring shaping, cutting Marshalling, steam press maintenance, go out kettle packing, A3.5B05 level steam pressure sand aerated concrete blocks are made.Product dry density ＜ 525kg/ m3, cubic compressive strength average value ＞ 3.5MPa, single group minimum value ＞ 2.8Mpa, split pressure ratio ＞ 0.16, mass loss after jelly ＜ 5.0%, intensity ＞ 2.8Mpa, thermal conductivity factor (dry state) ＜ 0.14W/ (mK) after jelly, drying shrinkage value (standard law) ＜ 0.50mm/m, qualification rate ＞ 98%.
When the framed volume of precuring is 3.44m3When, raw material components and its formula are：310~340kg of cement, lime 205~ 235kg, quartzy 1000~1100kg of Weathered Sand, 62~78kg of ardealite, 1.86~1.96kg of aqueous liquid aluminium powder cream, total water 1050 ~1150kg, wherein 330~420kg of external adding water.
The cement is the Portland cements of PO 42.5,8~15min of quicklime slaking speed, digestion temperature 75~ 85 DEG C, A (CaO+MgO) mass fraction 68~80%, ardealite is trade waste, calcium sulphate dihydrate (CaSO4·2H2O) quality Fraction 70~78%, sand are quartzy Weathered Sand, silica (SiO2) mass fraction 80~90%.Foaming agent is GLS-65 aquas Type aluminium powder cream.
The process chart that A3.5B05 level autoclave aerated concrete building blocks are prepared from Fig. 1 quartzy Weathered Sand can be seen that Lime is sent into lime powder bin after broken and ball milling, bulk cement is sent into cement bin；Quartzy Weathered Sand, ardealite, water, useless slurry are sent Enter ball mill mix grinding, slurry tank is sent into after wearing into slurry；Aluminium powder cream is sent into aluminium paste tank with water after measuring, mixing；Simultaneously Be sent into steam toward cast building agitator tank, by above-mentioned compound through measuring, pouring into a mould, getting angry, precuring, the demoulding, cutting, organize into groups, enter kettle, Go out kettle, torpedo, packing obtain product.During being somebody's turn to do, need to be passed through steam during cast heating, it is quiet to stop needing to be passed through during precuring Steam maintains room temperature, needs to be passed through steam steam press maintenance after entering kettle.The side plate after framed and cutting upset after the demoulding is by cleaning After assembling, casting process is sent into by track, recycled.Leftover pieces after cutting pour useless slurry pond by recirculated water, through filling Stirring is divided to form the useless slurry of certain density, feeding useless slurry storage tank is standby, and useless slurry is sent into ball mill with quartzy wind by slurry process processed Change sand, ardealite and water mix grinding.
Embodiment 1
By quartzy Weathered Sand and ardealite in mass ratio 100:6.2 use belt scale metering respectively, are transported to feeding of ball mill Mouthful, adding water and useless slurry, (flow-rate ratio of water and useless slurry is 7:1) mix grinding, obtain fineness be 26%, mass percent concentration be 62.0% slurry；Broken quick lime, ball milling prepare calcium lime powder, fineness 12%, digestion time 9min, digest temperature 81 DEG C, A (CaO+MgO) mass fraction 78%；By water and aluminium powder cream in mass ratio 9:1 stirs to form aluminium paste.Fineness is dry Material is by mass percent shared by the screen over-size of 180 mesh standard inspection sieves.Described useless slurry enters for the leftover bits in following After recirculated water, the density being agitated to form is 1.28g/cm3Mixture, the main component of the mixture includes water, quartzy wind Change calcium hydroxide, the hydrated calcium silicate that calcium oxide hydration reaction is formed in silica, lime and cement that sand and cement provide.
Feed proportioning system is automatically controlled using PLC, measures slurry 1733kg, external adding water 468kg, cement 320kg, lime respectively 220kg, start mixer discharging successively, stir 30s, heated using 0.35MPa steam, measure aluminium paste 19.4kg, tank to be mixed Interior temperature rises to 31 DEG C (outdoor environment temperature is 14~16 DEG C) and stops heating, will when temperature rises to 32 DEG C automatically in tank The aluminium paste measured is discharged into agitator tank, stirs 38s, opens casting valve, and slurry is all discharged into framed in agitator tank, will be framed Conveying and rested between the precuring that temperature is 48~52 DEG C, slurry goes up in 42min highly reaches 34.2cm, and billet surface is flat, Without sinking, collapse and phenomena such as bubbling, cut after 185min.The tailing of billet surface is removed, is organized into groups into kettle.
Steam press maintenance is carried out by distribution system to entering the base substrate after kettle, wherein pressure and time requirement are pressed corresponding to each link This method is completed：1. closing still kettle door, vacuumize, pressure in kettle is reached -0.03Mpa；
2. boosting heating, uninterrupted by following boosting temperature-rise period successively：- 0.03Mpa -0Mpa (in 15 minutes, will Pressure boosts to 0MPa from -0.03MPa in kettle)；0Mpa -0.45Mpa (in 60 minutes, pressure in kettle is boosted to from 0MPa 0.45MPa)；Pressure in kettle (in 30 minutes, is boosted to 0.8MPa) by 0.45Mpa -0.8Mpa from 0.45MPa；0.8Mpa— Pressure in kettle (in 30 minutes, is boosted to 1.32MPa) by 1.32Mpa from 0.8MPa；
3. constant pressure constant temperature：Supplement steam in time, keep pressure 1.32Mpa in kettle (maintaining 6.5 hours)；
4. decompression cooling, uninterrupted by following decompression temperature-fall period successively：1.32-1.0Mpa is (in 30 minutes, by kettle Interior pressure is depressurized to 1.0MPa from 1.32MPa), 1.0-0.65Mpa (in 30 minutes, pressure in kettle is depressurized to from 1.0MPa 0.65MPa), 0.65Mpa-normal pressure.
Pressure and temperature in the step, it is by conveying steam or gas exhaust inspecting, through supplying gas or being vented, kettle to still kettle It is interior to form boosting heating, constant pressure constant temperature or decompression cooling.
Product qualification rate is 98.9% after going out kettle.After testing, the autoclave aerated concrete building block prepared by above-mentioned steps is done Density 518kg/m3, cubic compressive strength average value 3.5MPa, single group minimum value 2.9Mpa, mass loss 4.2% after jelly, freeze Intensity 2.9Mpa afterwards, thermal conductivity factor (dry state) 0.127W/ (mK), drying shrinkage value (standard law) 0.39mm/m, meet GB11968-2006《Autoclave aerated concrete building block》The requirement of A3.5B05 level autoclave aerated concrete building blocks.
Embodiment 2
By quartzy Weathered Sand and ardealite in mass ratio 100:6.5 use belt scale metering respectively, add water and useless slurry (water and useless The flow-rate ratio of slurry is 7.2:1) mix grinding, the slurry that fineness is 25%, mass percent concentration is 62.3% is obtained；Broken raw stone Ash, ball milling prepare calcium lime powder, fineness 12%, digestion time 12min, digest 82 DEG C of temperature, A (CaO+MgO) mass fraction 76%；By water and aluminium powder cream in mass ratio 9:1 stirs to form aluminium paste.Fineness is that dry material passes through 180 mesh standard inspection sieves Screen over-size shared by mass percent.After described useless slurry enters recirculated water for the leftover pieces in following, what is be agitated to form is close Spend for 1.25g/cm3Mixture, the main component of the mixture includes the titanium dioxide that water, quartzy Weathered Sand and cement provide Calcium hydroxide, the hydrated calcium silicate of calcium oxide hydration reaction formation in silicon, lime and cement.
Feed proportioning system is automatically controlled using PLC, measures slurry 1710kg, external adding water 485kg, cement 325kg, lime respectively 225kg, start mixer discharging successively, stir 30s, heated using 0.35MPa steam, measure aluminium paste 19.2kg, tank to be mixed Interior temperature rises to 30.8 DEG C (outdoor environment temperature is 10~12 DEG C) and stops heating, and temperature rises to 31.8 DEG C automatically in tank When, the aluminium paste measured is discharged into agitator tank, stirs 38s, opens casting valve, slurry is all discharged into framed in agitator tank, Framed convey between the precuring that temperature is 48~52 DEG C is rested, slurry goes up in 44min highly reaches 34.6cm, billet surface It is flat, without sinking, collapse and phenomena such as bubbling, cut after 190min.The tailing of billet surface is removed, is organized into groups into kettle.
Steam press maintenance, wherein constant pressure and constant thermophase are carried out according to distribution system in embodiment 1, keeps pressure in kettle 1.32Mpa, maintain 7.0 hours, other pressure and time control processes are the same as embodiment 1.
Product qualification rate is 98.7% after going out kettle.After testing, the autoclave aerated concrete building block prepared by above-mentioned steps is done Density 514kg/m3, cubic compressive strength average value 3.6MPa, single group minimum value 3.0Mpa, mass loss 3.6% after jelly, freeze Intensity 3.0Mpa afterwards, thermal conductivity factor (dry state) 0.126W/ (mK), drying shrinkage value (standard law) 0.35mm/m, meet GB11968-2006《Autoclave aerated concrete building block》The requirement of A3.5B05 level autoclave aerated concrete building blocks.
Embodiment 3
By quartzy Weathered Sand and ardealite in mass ratio 100:7 use belt scale metering respectively, are transported to feed inlet of globe mill, Adding water and useless slurry, (flow-rate ratio of water and useless slurry is 7.5:1) mix grinding, obtain fineness be 27%, mass percent concentration 62.2% Slurry；Broken quick lime, ball milling prepare calcium lime powder, fineness 11%, digestion time 12min, digest 81 DEG C of temperature, A (CaO+MgO) mass fraction 80%；By water and aluminium powder cream in mass ratio 9:1 stirs to form aluminium paste.Fineness passes through for dry material Cross mass percent shared by the screen over-size of 180 mesh standard inspection sieves.Described useless slurry enters recirculated water for the leftover pieces in following Afterwards, the density being agitated to form is 1.26g/cm3Mixture, the main component of the mixture include water, quartzy Weathered Sand and Calcium hydroxide, the hydrated calcium silicate that calcium oxide hydration reaction is formed in silica, lime and cement that cement provides.
Feed proportioning system is automatically controlled using PLC, measures slurry 1702kg, external adding water 490kg, cement 330kg, lime respectively 230kg, start mixer discharging successively, stir 30s, heated using 0.35MPa steam, measure aluminium paste 19.5kg, tank to be mixed Interior temperature rises to 31 DEG C (outdoor environment temperature is 12~14 DEG C) and stops heating, will when temperature rises to 32 DEG C automatically in tank The aluminium paste measured is discharged into agitator tank, stirs 40s, opens casting valve, and slurry is all discharged into framed in agitator tank, will be framed Convey and rested between the precuring that temperature is 48-52 DEG C, slurry goes up in 45min highly reaches 35.4cm, and billet surface is flat, nothing Sink, collapse and phenomena such as bubbling, cut after 185min.The tailing of billet surface is removed, is organized into groups into kettle.
Steam press maintenance is carried out by distribution system to entering the base substrate after kettle, wherein pressure and time requirement are pressed corresponding to each link This method is completed：1. closing still kettle door, vacuumize, pressure in kettle is reached -0.03Mpa；
2. boosting heating, uninterrupted by following boosting temperature-rise period successively：- 0.03Mpa -0Mpa (in 15 minutes, will Pressure boosts to 0MPa from -0.03MPa in kettle)；0Mpa -0.45Mpa (in 65 minutes, pressure in kettle is boosted to from 0MPa 0.45MPa)；Pressure in kettle (in 35 minutes, is boosted to 0.8MPa) by 0.45Mpa -0.8Mpa from 0.45MPa；0.8Mpa— Pressure in kettle (in 35 minutes, is boosted to 1.32MPa) by 1.32Mpa from 0.8MPa；
3. constant pressure constant temperature：Supplement steam in time, keep pressure 1.32Mpa in kettle (maintaining 6.5 hours)；
4. decompression cooling, uninterrupted by following decompression temperature-fall period successively：1.32-1.0Mpa is (in 35 minutes, by kettle Interior pressure is depressurized to 1.0MPa from 1.32MPa), 1.0-0.65Mpa (in 35 minutes, pressure in kettle is depressurized to from 1.0MPa 0.65MPa), 0.65Mpa-normal pressure.
Pressure and temperature in the step, it is by conveying steam and gas exhaust inspecting, through supplying gas or being vented, kettle to still kettle It is interior to form boosting heating, constant pressure constant temperature, decompression cooling or normal temperature and pressure.
Product qualification rate is 99.0% after going out kettle.After testing, the autoclave aerated concrete building block prepared by above-mentioned steps is done Density 509kg/m3, cubic compressive strength average value 3.6MPa, single group minimum value 3.2Mpa split pressure ratio 0.20, quality after jelly Loss 2.8%, intensity 3.1Mpa after jelly, thermal conductivity factor (dry state) 0.1251W/ (mK), drying shrinkage value (standard law) 0.32mm/m, meet GB11968-2006《Autoclave aerated concrete building block》A3.5B05 level autoclave aerated concrete building blocks are wanted Ask.

Claims (6)

1. a kind of method that quartzy Weathered Sand prepares A3.5B05 level autoclave aerated concrete building blocks, it is characterised in that including as follows Preparation process：
（1）Quartzy Weathered Sand is delivered to ball mill, by water, useless slurry using flow-rate ratio as 7 with ardealite by weight after mixing:1 Ball mill is added, mix grinding 10-30min, obtains the slurry that fineness is 25-28%, mass percent concentration is 58-65%；Crush simultaneously Ball milling quick lime, obtain the calcium lime powder that fineness is 10%-13%；By water and aluminium powder cream using mass ratio as 8-10:1 mixing, stirring Aluminium paste is obtained, described fineness is dry material by mass percent shared by the screen over-size of 180 mesh standard inspection sieves；
（2）Cement, calcium lime powder, slurry, water are added in agitator tank, mixing, 25-35s is stirred, using 0.3-0.4MPa steaming Vapour is heated to 30-35 DEG C, stops heating, aluminium paste is added into agitator tank, continues after stirring 35-40s, by the slurry in agitator tank Be discharged into it is framed in, and by it is framed feeding room temperature be 48-52 DEG C precuring it is interior it is quiet stop, slurry is in framed interior expansion, 40-48min Form stable base substrate afterwards, base substrate without sink, collapse, bubbling and excreting water phenomenon, cut after the 170-190min that continues to rest, remove Leftover pieces after base substrate cutting, base substrate is sent into still kettle；
（3）Steam press maintenance is carried out by distribution system to the base substrate in still kettle, base substrate is in still kettle successively by vacuumizing, rising A3.5B05 level autoclave aerated concrete building blocks are obtained after pressure, constant pressure and decompression；
By weight, quartzy Weathered Sand 55-70 parts, cement 12-30 parts, quick lime 10-28 parts, aluminium powder cream 0.10-0.13 parts, Ardealite 3-6 parts；Wherein, the dry material component of the concrete segment also includes water, and the mass ratio of water and dry material is 0.67- 0.72：1；
Step（1）In, described useless slurry is step（2）After leftover pieces after middle base substrate cutting enter recirculated water, it is agitated to form Density be 1.2-1.3g/cm3Mixture, the main component of the mixture includes what water, quartzy Weathered Sand and cement provided Calcium hydroxide, the hydrated calcium silicate of calcium oxide hydration reaction formation in silica, lime and cement.
2. according to the method for claim 1, it is characterised in that step（2）Middle cement, calcium lime powder, slurry, water are added and stirred Mix in tank, mix, stir the 30s seconds, be steam heated to 31 DEG C using 0.35MPa, stop heating, in-tank mixing thing temperature to be mixed Degree rises to 32 DEG C, and aluminium paste is added into agitator tank, continues after stirring 40s, the slurry in agitator tank is discharged into framed, by mould Frame be sent into precuring that room temperature is 48-52 DEG C it is interior it is quiet stop, slurry forms base substrate stably in framed interior expansion of getting angry after 45min, Base substrate without sink, collapse, bubbling and bleeding wild effect, cut after the 185min that continues to rest, remove the side after base substrate cutting Corner material, base substrate is sent into still kettle.
3. according to the method for claim 1, it is characterised in that described step（3）In, after being vacuumized in still kettle, steam It is-0.02-- 0.03MPa to press pressure in kettle；Steam is conveyed into still kettle again, 0MPa is risen in 12-18min；Continue to rise Pressure, rises to 0.45MPa in 50-70min；Further boosting, rises to 0.8MPa in 25-35min；Boost again, 25- 1.32MPa is risen in 35min；Steam is supplemented into still kettle in time, it is 1.31-1.33MPa to keep pressure in kettle, maintains 6- 7h；Then exhaust decompression, is depressurized to 1.0MPa in 25-35min；Further exhaust decompression, is depressurized in 25-35min 0.65MPa；Continue exhaust decompression, pressure in still kettle is down to normal pressure.
4. according to the method for claim 1, it is characterised in that by weight, the concrete segment includes following weight The dry material composition of part：Quartzy 62.4 parts of Weathered Sand, 19.5 parts of cement, 13.6 parts of quick lime, 0.12 part of aluminium powder cream, ardealite 4.38 part；Wherein, the dry material component of the concrete segment also includes water, and the mass ratio of water and dry material is 0.68：1.
5. according to the method for claim 1, it is characterised in that by weight, cement is the normal silicates of PO 42.5 Cement；The digestion rate of quick lime is 8-15min/ DEG C, and digestion temperature is 75-85 DEG C, and A (CaO+MgO) mass fraction is 68- 80%；Ardealite, the content of its calcium sulphate dihydrate is 70-78%；The content of silica is 80-90% in quartzy Weathered Sand.
6. A3.5B05 level autoclave aerated concrete building blocks are in heat-preserving wall made from the method described in claim any one of 1-5 On application.
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