CN105693178A - Method for preparing A3.5B05-grade autoclaved aerated concrete block by quartz weathered sand and application thereof to wall - Google Patents
Method for preparing A3.5B05-grade autoclaved aerated concrete block by quartz weathered sand and application thereof to wall Download PDFInfo
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- CN105693178A CN105693178A CN201610057522.4A CN201610057522A CN105693178A CN 105693178 A CN105693178 A CN 105693178A CN 201610057522 A CN201610057522 A CN 201610057522A CN 105693178 A CN105693178 A CN 105693178A
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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
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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
- 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
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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
- 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
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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
- 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
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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
- 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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Abstract
The invention provides a method for preparing an A3.5B05-grade autoclaved aerated concrete block by quartz weathered sand and application thereof to a wall. The A3.5B05-grade high-performance autoclaved aerated concrete block is prepared by using the quartz weathered sand, cement, quick lime, industrial waste ardealite, aluminum powder paste and water as raw materials. The block has a dry density of 509kg/m<3>, a cube crushing strength average value of 3.6MPa, a single group minimum value of 3.2Mpa, a splitting pressure ratio of 0.20, post freezing mass loss of 2.8%, post freezing strength of 3.1Mpa, a heat conductivity coefficient (dry state) of 0.1251W/(m K), a drying shrinkage value (standardized method) of 0.32mm/m, and a qualified rate of over 98%. According to the method provided by the invention, a raw material treatment method is reasonable, a formula is scientific in calculation, the production flow is simple, and production waste can be recycled. According to the invention, the block is applied to a thermal-insulating wall.
Description
Technical field
The present invention relates to a kind of quartz A3.5B05 level autoclave aerated concrete building block of preparing of Weathered Sand and preparation method thereof, belong to novel energy-saving environment-friendly materials for wall field。
Background technology
Quartz Weathered Sand, is that natural quartz is formed after air slaking in millions upon millions of years, and its former crystal habit converts, and becomes tiny crystal grain, and portions turn is noncrystal, and Main Ingredients and Appearance is silicon dioxide (SiO2), containing small amounts aluminum (Al2O3), potassium oxide (K2O), ferrum oxide (Fe2O3) and calcium oxide (CaO)。Quartz Weathered Sand is to provide SiO at autoclave aerated concrete building block production process Main Function2, its mineral constituent is complicated, and what content was maximum is quartz, next to that Anhydrite, is also mingled with Muscovitum, carbonate, clay etc., wherein possibly together with a number of Na2O and K2O, they generate solubility Na2SO4And K2SO4。
The clay impurity contained in quartz Weathered Sand is very big on the impact of autoclave aerated concrete building block performance: on the one hand, owing to clay is a kind of high dispersive material, water absorption is strong, during too high levels, phosphoric acid can be made to increase, if the viscosity that guarantee is certain and increase water consumption, then extend again base substrate firm time；On the other hand, containing a certain amount of Al in clay2O3, it promotes the generation of steam-pressing aero-concrete hydrated product tobermorite (tobermorite) phase。
Tobermorite is silicon-oxy tetrahedron strand and the layer structure of calcium oxide polyhedron composition, and containing moisture between layer structure, intermediary water is unstable, and very easily dehydration causes volume contraction to deform。The aerated concrete products excellent in order to obtain stable performance, it is necessary to tobermorite is controlled by。
At present, along with the fast development of steam pressure sand aerated concrete block industry Technology and equipment, the ability producing B06, B07 level autoclaved aerated building block in enormous quantities has become ripe。But can treatment in accordance with local conditions, combine local physical condition high-volume, production A2.0B04, A3.5B05 level steam pressurized coagulation building block of high qualification rate, the building materials enterprise of thin piece little。The Major Difficulties producing A2.0B04, A3.5B05 level autoclave aerated concrete building block is in that, while reducing product unit weight, ensures product strength again。The quality of B04, B05 level steam pressurized foam concrete quality directly affects the cold-heat bridge position isothermal holding such as self heat insulation wall and beams of concrete, post and shear wall。
Summary of the invention
It is an object of the invention to provide a kind of employing quartz Weathered Sand and prepare A3.5B05 level steam pressure sand aerated concrete block。By strictly controlling each raw material quality, adjust match ratio and accurate measurement, improve process, improve the stability of base substrate, it is ensured that steam pressure sand aerated concrete block air hole structure is good, unit weight is low, intensity is high, heat conductivity and drying shrinkage value is low, frost resistance is good。
For achieving the above object, the present invention adopts the following technical scheme that
A3.5B05 level autoclave aerated concrete building block prepared by a kind of quartz Weathered Sand, this concrete segment includes the dry material composition of following weight portion: quartz Weathered Sand 55-70 part, cement 12-30 part, quick lime 10-28 part, aluminium powder cream 0.10-0.13 part, ardealite 3-6 part；Wherein, it is 0.67-0.72:1 that the dry material component of this concrete segment also includes the mass ratio of water, water and dry material。
The dry material of above-mentioned concrete segment more preferably includes the dry material composition of following weight portion: quartz Weathered Sand 62.4 parts, cement 19.5 parts, quick lime 13.6 parts, aluminium powder cream 0.12 part, ardealite 4.38 parts；Wherein, it is 0.68:1 that the dry material component of this concrete segment also includes the mass ratio of water, water and dry material。
The present invention also provides for a kind of method that quartz Weathered Sand prepares A3.5B05 level autoclave aerated concrete building block, including being made by step:
1) by quartz Weathered Sand and ardealite by weight after mix, being delivered to ball mill, for 7:1, water, useless slurry are added ball mill, mix grinding 10-30min with flow-rate ratio, obtaining fineness be 25-28%, mass percent concentration is the slip of 58-65%；Pulverize and ball milling quick lime, obtain the calcium lime powder that fineness is 10%-13%；Being mixed for 8-10:1 with mass ratio with aluminium powder cream by water, stirring obtains aluminium paste；
2) by cement, calcium lime powder, slip, water adds in agitator tank, mixing, stirring 25-35s, adopt 0.3-0.4MPa's to be steam heated to 30-35 DEG C, stop heating, aluminium paste is added in agitator tank, after continuing stirring 35-40s, slip in agitator tank is discharged into framed in, and stop quiet in precuring that framed feeding room temperature is 48-52 DEG C, slip is in framed interior expansion, stable base substrate is formed after 40-48min, base substrate is without sinking, subside, the phenomenon such as bubbling and bleeding, continue to rest cutting after 170-190min, remove the leftover pieces after base substrate cutting, base substrate is sent in still kettle；
3) by distribution system, the base substrate in still being carried out steam press maintenance, base substrate obtains A3.5B05 level autoclave aerated concrete building block after sequentially passing through evacuation, boosting, constant voltage and blood pressure lowering in still kettle。
Described step 1) in, described fineness is that dry material is through mass percent shared by the screen over-size of 180 order standard inspection sieves。
Described step 1) in, described useless slurry is step 2) in leftover pieces after base substrate cutting enter after recirculated water, the density being agitated to form is 1.2-1.3g/cm3Mixture, the main component of this mixture includes calcium hydroxide, the hydrated calcium silicate that in silicon dioxide that water, quartz Weathered Sand and cement provides, Calx and cement, calcium oxide hydration reaction is formed。
Described step 2) in, cement, calcium lime powder, slip, water adds in agitator tank, mixing, stirring 30s, adopt 0.35MPa's to be steam heated to 31 DEG C, stop heating, aluminium paste is added in agitator tank, after continuing stirring 40s, slip in agitator tank is discharged into framed in, stop quiet in precuring that framed feeding room temperature is 50 DEG C, slip is got angry in framed expansion, stable base substrate is formed after 45min, base substrate is without sinking, subside, the wild effect such as bubbling and bleeding, continue to rest cutting after 185min, remove the leftover pieces after base substrate cutting, base substrate is sent in still kettle。
Described step 3) in, in still kettle after evacuation, in still kettle, pressure is-0.03MPa；In still kettle, carry steam again, in 10-15min, rise to 0MPa；Continue boosting, in 50-70min, rise to 0.45MPa；Boosting, rises to 0.8MPa in 25-35min further；Again boost, in 25-35min, rise to 1.32MPa；Supplementing steam in time in still kettle, keeping pressure in still is 1.31-1.33MPa, maintains 6-7h；Then aerofluxus blood pressure lowering, is depressurized to 1.0MPa in 25-35min；Further aerofluxus blood pressure lowering, is depressurized to 0.65MPa in 25-35min；Continue aerofluxus blood pressure lowering, pressure in still kettle is down to normal pressure。
Above-mentioned middle cement is P O42.5 Portland cement, this portland cement reacts rapidly after mainly meeting water in the preparation of concrete segment, produce substantial amounts of hydrated calcium silicate gel, phosphoric acid increases guarantee pouring stability rapidly, base substrate forms hardening that is rear and that accelerate base substrate, is conducive to cutting。Cement is also the supplier of CaO simultaneously。
The digestion rate of quick lime is 8-15min/ DEG C, digestion temperature is 75-85 DEG C, the mass fraction of A (CaO+MgO) is 68-80%, and this quick lime is main in the preparation of concrete segment provides effective CaO and heat, and the early strength of slip densification and base substrate is played an important role。The heat that effective CaO hydration reaction produces, promotes that aluminum cream is got angry。
Ardealite, the content of its calcium sulphate dihydrate is 70-78%, the suppression that quick lime is mainly cleared up by this ardealite in the preparation of concrete segment, extend the slip thickening time, slurry temperature is made to increase mild, aluminum cream is got angry uniformly, is conducive to base substrate to form good air hole structure, is provided that product strength within the specific limits。Also assist in hydrothermal synthesis reaction and improve product strength, reduce shrinkage value, improve frost resistance。When consumption is too much, easily causing slip multiviscosisty and cross slow and cause bubbling and sinking, even collapse mould。
In quartz Weathered Sand, the content of silicon dioxide is 80-90%, and this quartz Weathered Sand primarily serves offer siliceous material and skeletal support effect, SiO in the preparation of concrete segment2React with the CaO in Calx and cement, produce new hydrated product when steam press maintenance, make autoclave aerated concrete building block reach requirement of strength。
Aluminium powder cream plays the effect of foaming agent in the preparation of concrete segment。Metallic aluminium in aluminum cream and water react generation hydrogen under alkaline environment, and hydrogen forms nuclei of bubbles on aluminum cream fine grained surface, and bubble parameters promotes slip to expand, and forms the base substrate of certain volume。
The important component of reaction that water is by hydrothermal synthesis reaction and aluminium powder cream is got angry, is also make each raw material mix homogeneously and carry out the necessary medium of complex chemical reaction。Appropriate ratio of water to material makes slip have suitable denseness and mobility, makes to get angry smooth and easy, and base substrate obtains good air hole structure。
By autoclave aerated concrete building block dry density < 525kg/m prepared by above-mentioned steps3, cubic compressive strength meansigma methods > 3.5MPa, single group minima > 2.8Mpa, split pressure ratio > 0.16, freeze rear mass loss < 5.0%, freeze rear intensity > 2.8Mpa, heat conductivity (dry state) < 0.14W/ (m K), drying shrinkage value (standard technique) < 0.50mm/m, reach the requirement of GB GB11968-2006 " autoclave aerated concrete building block " A3.5B05 level autoclave aerated concrete building block。Qualification rate > 98%。
Employing technical scheme has the advantages that
The present invention can high-volume, high qualification rate production A3.5B05 level autoclave aerated concrete building block。Compared with existing process for producing aerated concrete, there is following remarkable advantage。
1. the present invention adds the industrial waste ardealite of suitable proportion and useless slurry mix grinding in wet grinding slurrying。Add trade waste ardealite and can effectively suppress the digestion reaction of quick lime, not only solve production quick lime because digestion rate is fast, digestion temperature height causes unstable problem of getting angry, also alleviate a difficult problem for trade waste comprehensive utilization to a certain extent。Useless slurry mix and adopt mix grinding technique, overcome the problem that quartz Weathered Sand activity is low and pulp viscosities is poor。
The waste material that useless slurry is after Aerated concrete blank cutting is formed with water stirring, and density domination is at 1.2～1.3g/cm3, useless slurry is transported to useless slurry tank for mix grinding slurrying by Pulp pump。Because having higher basicity in useless slurry, and after long time stored, each material has tentatively carried out hydration reaction, and number of gels is more。Mix grinding technique then makes partial material antedating response, is conducive to base substrate to harden, and shortens the precuring time。
2. the present invention properly increases the fineness of slip in mix grinding slurrying。The quartzy Weathered Sand SiO that the present invention uses2Content is up to 88.9%, and 180 mesh sieve margins only 50～55%, clay content reaches 12%。Owing to before making quartz Weathered Sand ball milling, self fine aggregate content is many, specific surface area is big, SiO2Content is high, can guarantee that SiO2Abundant reaction with CaO。If slip fineness is relatively low, stickiness or the denseness of slip are excessive, and mobility is deteriorated, and expansion of getting angry is smooth and easy not。
3. the present invention increases ratio of water to material in dispensing link, reduces pouring temperature。A3.5B05 level autoclave aerated concrete building block is relatively low relative to B06, B07 level building block dry density, and the dry material of unit volume is less, to ensure that goods reach the intensity of requirement simultaneously, should suitably increase calcium silicon ratio, generates more silico-calcium hydrated product。The increase of Calx or cement cementitious material ratio, the heat that effective CaO hydration reaction produces increases, and slip bodying velocity is accelerated, and need to reduce warm-up time, reduces pouring temperature, reduces aluminum cream raising rate。Need to increase ratio of water to material, it is suppressed that the multiviscosisty of slip simultaneously。Finally making slip in expansion process of getting angry, raising rate and bodying velocity, setting rate are harmonious, and slip expand 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 heat conductivity, improve intensity, strengthen frost resistance, reduce drying shrinkage value, it is critical only that production process determines the source material mixture ratio being suitable for quartz Weathered Sand, through accurate measurement, control heating-up temperature and mixing time, it is ensured that stability that what slurry was good get angry, and it expand into the volume of setting, hydrated calcium silicate and the aquation calcium aluminosilicate crystallizable mineral of some and form is generated when the steam press maintenance formulated。
Accompanying drawing explanation
Fig. 1 is the process chart that quartz Weathered Sand prepares A3.5B05 level autoclave aerated concrete building block。
Fig. 2,3,4 are the scanned copy that quartz Weathered Sand prepares the examining report book of A2.0B04 level autoclave aerated concrete building block。
Detailed description of the invention
Quartz Weathered Sand prepares A3.5B05 level autoclave aerated concrete building block, each raw-material weight percentage ratio in total dry material: cement 12～30%, quick lime 10～28%, quartz Weathered Sand 55～70%, aluminium powder cream 0.10～0.13%, ardealite 3%～6%。Total water (comprise slip is moisture, external adding water, aluminium paste are moisture, steam of heating moisture) and total dry material ratio (ratio of water to material) are 0.67～0.72。Above-mentioned raw material stirs by operating procedure, heat after, be cast into framed, precuring molding, cutting marshalling, steam press maintenance, go out still and pack, make A3.5B05 level steam pressure sand aerated concrete block。Product dry density < 525kg/m3, cubic compressive strength meansigma methods > 3.5MPa, single group minima > 2.8Mpa, split pressure ratio > 0.16, freeze rear mass loss < 5.0%, freeze rear intensity > 2.8Mpa, heat conductivity (dry state) < 0.14W/ (m K), drying shrinkage value (standard technique) < 0.50mm/m, qualification rate > 98%。
When the framed volume of precuring is 3.44m3Time, raw material components and formula thereof be: cement 310～340kg, Calx 205～235kg, quartz Weathered Sand 1000～1100kg, ardealite 62～78kg, aqueous liquid aluminium powder cream 1.86～1.96kg, total water 1050～1150kg, wherein external adding water 330～420kg。
Described cement is P O42.5 Portland cement, and quicklime slaking speed 8～15min, digestion temperature 75～85 DEG C, A (CaO+MgO) mass fraction 68～80%, ardealite is trade waste, calcium sulphate dihydrate (CaSO4·2H2O) mass fraction 70～78%, sand is quartz Weathered Sand, silicon dioxide (SiO2) mass fraction 80～90%。Foaming agent is GLS-65 water aqua type aluminium powder cream。
The process chart of A3.5B05 level autoclave aerated concrete building block is prepared it can be seen that Calx is through crushing and send into after ball milling lime powder bin, bulk cement feeding cement bin from the quartzy Weathered Sand of Fig. 1；Ball mill mix grinding sent into by quartz Weathered Sand, ardealite, water, useless slurry, sends into slurry tank after wearing into slip；Aluminium powder cream and water send into aluminium paste tank after metering, mix and blend；Simultaneously send into steam toward cast building agitator tank, by above-mentioned compound through measuring, pour into a mould, getting angry, precuring, the demoulding, cutting, organize into groups, enter still, go out still, torpedo, packing obtain product。In this process, pouring into a mould and need to pass into steam in process of heating, quiet stopping needs in precuring process to pass into steam maintenance room temperature, needs to pass into steam steam press maintenance after entering still。The side plate after framed and cutting upset after the demoulding, after cleaning and assembling, is sent into casting process by track, is recycled。Leftover pieces after cutting are poured useless stock tank by recirculated water, through being sufficiently stirred for the useless slurry forming certain density, send into useless slurry storage tank standby, and useless slurry is sent into ball mill with quartz Weathered Sand, ardealite and water mix grinding by slip process processed。
Embodiment 1
Quartz Weathered Sand and ardealite 100:6.2 in mass ratio are used belt scale metering respectively, it is transported to feed inlet of globe mill, add water and give up slurry (flow-rate ratio of water and useless slurry is 7:1) mix grinding, obtain fineness be 26%, mass percent concentration be the slip of 62.0%；Broken quick lime, ball milling prepares calcium lime powder, and fineness is 12%, digestion time 9min, digests temperature 81 DEG C, A (CaO+MgO) mass fraction 78%；Stir formation aluminium paste by water and aluminium powder cream 9:1 in mass ratio。Fineness is that dry material is through mass percent shared by the screen over-size of 180 order standard inspection sieves。Described useless slurry be following in leftover bits enter after recirculated water, the density being agitated to form is 1.28g/cm3Mixture, the main component of this mixture includes calcium hydroxide, the hydrated calcium silicate that in silicon dioxide that water, quartz Weathered Sand and cement provides, Calx and cement, calcium oxide hydration reaction is formed。
Feed proportioning system adopts PLC to automatically control, metering slip 1733kg respectively, external adding water 468kg, cement 320kg, Calx 220kg, start blender discharging successively, stirring 30s, use the heating of 0.35MPa steam, metering aluminium paste 19.4kg, in tank to be mixed, temperature rises to 31 DEG C (outdoor environment temperature is 14～16 DEG C) stopping heating, when in tank, temperature rises to 32 DEG C automatically, the aluminium paste measured is discharged in agitator tank, stirring 38s, open casting valve, in agitator tank slurry be all discharged into framed in, it is delivered between the precuring that temperature is 48～52 DEG C rests framed, slurry goes up in 42min and highly reaches 34.2cm, billet surface is smooth, without sinking, subside and the phenomenon such as bubbling, cut after 185min。Remove the tailing of billet surface, organize into groups into still。
By distribution system, the base substrate after entering still is carried out steam press maintenance, and pressure and time requirement that wherein each link is corresponding complete in this way: 1. close still kettle door, evacuation, make pressure in still reach-0.03Mpa；
2. boosting heats up, uninterrupted through the temperature-rise period that boosts as follows successively: pressure in still (in 15 minutes, is boosted to 0MPa from-0.03MPa) by-0.03Mpa 0Mpa；Pressure in still (in 60 minutes, is boosted to 0.45MPa from 0MPa) by 0Mpa 0.45Mpa；Pressure in still (in 30 minutes, is boosted to 0.8MPa from 0.45MPa) by 0.45Mpa 0.8Mpa；Pressure in still (in 30 minutes, is boosted to 1.32MPa from 0.8MPa) by 0.8Mpa 1.32Mpa；
3. constant voltage constant temperature: supplement steam in time, keep pressure 1.32Mpa (maintaining 6.5 hours) in still；
4. blood pressure lowering cooling, uninterrupted through following blood pressure lowering temperature-fall period successively: 1.32 1.0Mpa are (in 30 minutes, pressure in still is depressurized to 1.0MPa from 1.32MPa), 1.0 0.65Mpa are (in 30 minutes, pressure in still is depressurized to 0.65MPa from 1.0MPa), 0.65Mpa normal pressure。
Pressure and temperature in this step, is by still kettle is carried steam or gas exhaust inspecting, through supplying gas or aerofluxus, forms boosting intensification, constant voltage constant temperature or blood pressure lowering cooling in still。
After going out still, conforming product rate is 98.9%。After testing, the autoclave aerated concrete building block dry density 518kg/m prepared by above-mentioned steps3Cubic compressive strength meansigma methods 3.5MPa, single group minima 2.9Mpa, freeze rear mass loss 4.2%, freeze rear intensity 2.9Mpa, heat conductivity (dry state) 0.127W/ (m K), drying shrinkage value (standard technique) 0.39mm/m, meets the requirement of GB11968-2006 " autoclave aerated concrete building block " A3.5B05 level autoclave aerated concrete building block。
Embodiment 2
By quartz Weathered Sand and ardealite 100:6.5 in mass ratio respectively with belt scale metering, the slurry that adds water and give up (water and the flow-rate ratio starched of giving up are 7.2:1) mix grinding, obtain fineness be 25%, mass percent concentration be the slip of 62.3%；Broken quick lime, ball milling prepares calcium lime powder, and fineness is 12%, digestion time 12min, digests temperature 82 DEG C, A (CaO+MgO) mass fraction 76%；Stir formation aluminium paste by water and aluminium powder cream 9:1 in mass ratio。Fineness is that dry material is through mass percent shared by the screen over-size of 180 order standard inspection sieves。Described useless slurry be following in leftover pieces enter after recirculated water, the density being agitated to form is 1.25g/cm3Mixture, the main component of this mixture includes calcium hydroxide, the hydrated calcium silicate that in silicon dioxide that water, quartz Weathered Sand and cement provides, Calx and cement, calcium oxide hydration reaction is formed。
Feed proportioning system adopts PLC to automatically control, metering slip 1710kg respectively, external adding water 485kg, cement 325kg, Calx 225kg, start blender discharging successively, stirring 30s, use the heating of 0.35MPa steam, metering aluminium paste 19.2kg, in tank to be mixed, temperature rises to 30.8 DEG C (outdoor environment temperature is 10～12 DEG C) stopping heating, when in tank, temperature rises to 31.8 DEG C automatically, the aluminium paste measured is discharged in agitator tank, stirring 38s, open casting valve, in agitator tank slurry be all discharged into framed in, it is delivered between the precuring that temperature is 48～52 DEG C rests framed, slurry goes up in 44min and highly reaches 34.6cm, billet surface is smooth, without sinking, subside and the phenomenon such as bubbling, cut after 190min。Remove the tailing of billet surface, organize into groups into still。
Steam press maintenance is carried out according to distribution system in embodiment 1, wherein constant pressure and constant thermophase, keep pressure 1.32Mpa in still, maintain 7.0 hours, other pressure and time control process with embodiment 1。
After going out still, conforming product rate is 98.7%。After testing, the autoclave aerated concrete building block dry density 514kg/m prepared by above-mentioned steps3Cubic compressive strength meansigma methods 3.6MPa, single group minima 3.0Mpa, freeze rear mass loss 3.6%, freeze rear intensity 3.0Mpa, heat conductivity (dry state) 0.126W/ (m K), drying shrinkage value (standard technique) 0.35mm/m, meets the requirement of GB11968-2006 " autoclave aerated concrete building block " A3.5B05 level autoclave aerated concrete building block。
Embodiment 3
Quartz Weathered Sand and ardealite 100:7 in mass ratio are used belt scale metering respectively, it is transported to feed inlet of globe mill, add water and give up slurry (flow-rate ratio of water and useless slurry is 7.5:1) mix grinding, obtain fineness be 27%, mass percent concentration be the slip of 62.2%；Broken quick lime, ball milling prepares calcium lime powder, and fineness is 11%, digestion time 12min, digests temperature 81 DEG C, A (CaO+MgO) mass fraction 80%；Stir formation aluminium paste by water and aluminium powder cream 9:1 in mass ratio。Fineness is that dry material is through mass percent shared by the screen over-size of 180 order standard inspection sieves。Described useless slurry be following in leftover pieces enter after recirculated water, the density being agitated to form is 1.26g/cm3Mixture, the main component of this mixture includes calcium hydroxide, the hydrated calcium silicate that in silicon dioxide that water, quartz Weathered Sand and cement provides, Calx and cement, calcium oxide hydration reaction is formed。
Feed proportioning system adopts PLC to automatically control, metering slip 1702kg respectively, external adding water 490kg, cement 330kg, Calx 230kg, start blender discharging successively, stirring 30s, use the heating of 0.35MPa steam, metering aluminium paste 19.5kg, in tank to be mixed, temperature rises to 31 DEG C (outdoor environment temperature is 12～14 DEG C) stopping heating, when in tank, temperature rises to 32 DEG C automatically, the aluminium paste measured is discharged in agitator tank, stirring 40s, open casting valve, in agitator tank slurry be all discharged into framed in, it is delivered between the precuring that temperature is 48-52 DEG C rests framed, slurry goes up in 45min and highly reaches 35.4cm, billet surface is smooth, without sinking, subside and the phenomenon such as bubbling, cut after 185min。Remove the tailing of billet surface, organize into groups into still。
By distribution system, the base substrate after entering still is carried out steam press maintenance, and pressure and time requirement that wherein each link is corresponding complete in this way: 1. close still kettle door, evacuation, make pressure in still reach-0.03Mpa；
2. boosting heats up, uninterrupted through the temperature-rise period that boosts as follows successively: pressure in still (in 15 minutes, is boosted to 0MPa from-0.03MPa) by-0.03Mpa 0Mpa；Pressure in still (in 65 minutes, is boosted to 0.45MPa from 0MPa) by 0Mpa 0.45Mpa；Pressure in still (in 35 minutes, is boosted to 0.8MPa from 0.45MPa) by 0.45Mpa 0.8Mpa；Pressure in still (in 35 minutes, is boosted to 1.32MPa from 0.8MPa) by 0.8Mpa 1.32Mpa；
3. constant voltage constant temperature: supplement steam in time, keep pressure 1.32Mpa (maintaining 6.5 hours) in still；
4. blood pressure lowering cooling, uninterrupted through following blood pressure lowering temperature-fall period successively: 1.32 1.0Mpa are (in 35 minutes, pressure in still is depressurized to 1.0MPa from 1.32MPa), 1.0 0.65Mpa are (in 35 minutes, pressure in still is depressurized to 0.65MPa from 1.0MPa), 0.65Mpa normal pressure。
Pressure and temperature in this step, is by still kettle is carried steam and gas exhaust inspecting, through supplying gas or aerofluxus, forms boosting intensification, constant voltage constant temperature, blood pressure lowering cooling or normal temperature and pressure in still。
After going out still, conforming product rate is 99.0%。After testing, the autoclave aerated concrete building block dry density 509kg/m prepared by above-mentioned steps3Cubic compressive strength meansigma methods 3.6MPa, single group minima 3.2Mpa, split pressure ratio 0.20, freeze rear mass loss 2.8%, freeze rear intensity 3.1Mpa, heat conductivity (dry state) 0.1251W/ (m K), drying shrinkage value (standard technique) 0.32mm/m, meet the requirement of GB11968-2006 " autoclave aerated concrete building block " A3.5B05 level autoclave aerated concrete building block。
Claims (9)
1. the method that a quartzy Weathered Sand prepares A3.5B05 level autoclave aerated concrete building block, it is characterised in that include being made by step:
(1) by quartz Weathered Sand and ardealite by weight after mix, being delivered to ball mill, for 7:1, water, useless slurry are added ball mill, mix grinding 10-30min with flow-rate ratio, obtaining fineness be 25-28%, mass percent concentration is the slip of 58-65%；Pulverize and ball milling quick lime, obtain the calcium lime powder that fineness is 10%-13%；Being mixed for 8-10:1 with mass ratio with aluminium powder cream by water, stirring obtains aluminium paste；
(2) by cement, calcium lime powder, slip, water adds in agitator tank, mixing, stirring 25-35s, adopt 0.3-0.4MPa's to be steam heated to 30-35 DEG C, stop heating, aluminium paste is added in agitator tank, after continuing stirring 35-40s, slip in agitator tank is discharged into framed in, and stop quiet in precuring that framed feeding room temperature is 48-52 DEG C, slip is in framed interior expansion, stable base substrate is formed after 40-48min, base substrate is without sinking, subside, the phenomenon such as bubbling and bleeding, continue to rest cutting after 170-190min, remove the leftover pieces after base substrate cutting, base substrate is sent in still kettle；
(3) by distribution system, the base substrate in still kettle being carried out steam press maintenance, base substrate obtains A3.5B05 level autoclave aerated concrete building block after sequentially passing through evacuation, boosting, constant voltage and blood pressure lowering in still kettle。
2. method according to claim 1, it is characterised in that in step (1), described fineness is that dry material is through mass percent shared by the screen over-size of 180 order standard inspection sieves。
3. method according to claim 1, it is characterised in that in step (1), described useless slurry is that in step (2), leftover pieces after base substrate cutting enter after recirculated water, and the density being agitated to form is 1.2-1.3g/cm3Mixture, the main component of this mixture includes calcium hydroxide, the hydrated calcium silicate that in silicon dioxide that water, quartz Weathered Sand and cement provides, Calx and cement, calcium oxide hydration reaction is formed。
4. method according to claim 1, it is characterized in that, cement in step (2), calcium lime powder, slip, water adds in agitator tank, mixing, the stirring 30s second, adopt 0.35MPa's to be steam heated to 31 DEG C, stop heating, in-tank mixing thing temperature to be mixed rises to 32 DEG C, aluminium paste is added in agitator tank, after continuing stirring 40s, slip in agitator tank is discharged into framed in, stop quiet in precuring that framed feeding room temperature is 48-52 DEG C, slip is got angry in framed expansion, stable base substrate is formed after 45min, base substrate is without sinking, subside, the wild effect such as bubbling and bleeding, continue to rest cutting after 185min, remove the leftover pieces after base substrate cutting, base substrate is sent in still kettle。
5. method according to claim 1, it is characterised in that in described step (3), in still kettle after evacuation, in still kettle, pressure is-0.02-0.03MPa；In still kettle, carry steam again, in 12-18min, rise to 0MPa；Continue boosting, in 50-70min, rise to 0.45MPa；Boosting, rises to 0.8MPa in 25-35min further；Again boost, in 25-35min, rise to 1.32MPa；Supplementing steam in time in still kettle, keeping pressure in still is 1.31-1.33MPa, maintains 6-7h；Then aerofluxus blood pressure lowering, is depressurized to 1.0MPa in 25-35min；Further aerofluxus blood pressure lowering, is depressurized to 0.65MPa in 25-35min；Continue aerofluxus blood pressure lowering, pressure in still kettle is down to normal pressure。
6. method according to claim 1, it is characterised in that by weight, quartz Weathered Sand 55-70 part, cement 12-30 part, quick lime 10-28 part, aluminium powder cream 0.10-0.13 part, ardealite 3-6 part；Wherein, it is 0.67-0.72:1 that the dry material component of this concrete segment also includes the mass ratio of water, water and dry material。
7. method according to claim 1, it is characterised in that by weight, this concrete segment includes the dry material composition of following weight portion: quartz Weathered Sand 62.4 parts, cement 19.5 parts, quick lime 13.6 parts, aluminium powder cream 0.12 part, ardealite 4.38 parts；Wherein, it is 0.68:1 that the dry material component of this concrete segment also includes the mass ratio of water, water and dry material。
8. the method according to claim 6 or 7, it is characterised in that by weight, cement is P O42.5 Portland cement；The digestion rate of quick lime is 8-15min/ DEG C, and digestion temperature is 75-85 DEG C, and the mass fraction of A (CaO+MgO) is 68-80%；Ardealite, the content of its calcium sulphate dihydrate is 70-78%；In quartz Weathered Sand, the content of silicon dioxide is 80-90%。
9. the quartzy Weathered Sand described in any one of right 1-8 prepares the application on heat-preserving wall of the A3.5B05 level autoclave aerated concrete building block。
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| CN116587409A (en) * | 2023-06-15 | 2023-08-15 | 江苏宇航板业有限公司 | Autoclaved curing method for calcium silicate slab |
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| CN105753420B (en) * | 2015-04-03 | 2017-11-14 | 湖北益通建设股份有限公司 | A3.5 B05 levels autoclave aerated concrete building blocks and its application on wall prepared by a kind of quartzy Weathered Sand |
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