CN104153512A - Processing method for building waste foamed concrete composite heat preservation building blocks - Google Patents
Processing method for building waste foamed concrete composite heat preservation building blocks Download PDFInfo
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- CN104153512A CN104153512A CN201410383718.3A CN201410383718A CN104153512A CN 104153512 A CN104153512 A CN 104153512A CN 201410383718 A CN201410383718 A CN 201410383718A CN 104153512 A CN104153512 A CN 104153512A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/24—Structural elements or technologies for improving thermal insulation
- Y02A30/244—Structural elements or technologies for improving thermal insulation using natural or recycled building materials, e.g. straw, wool, clay or used tires
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
- Y02W30/50—Reuse, recycling or recovery technologies
- Y02W30/91—Use of waste materials as fillers for mortars or concrete
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Abstract
The invention discloses a processing method for building waste foamed concrete composite heat preservation building blocks. The invention provides a processing method for the building waste foamed concrete composite heat preservation building blocks. By virtue of the processing method, the performance of a recycled material can be optimized to the maximum extent, so that the compression strength, the shear strength and the heat preservation performance of a finished product can be guaranteed. Each building block comprises a base body and a heat preservation core body. A building block preparation process comprises base body forming, core body preparation, maintaining and drying working procedures; each base body comprises cement, an active mixed material, a modifier and a recycled aggregate. A processing method for the recycled aggregate comprises the steps of (1) classifying and initially sorting building waste; (2) roughly crushing building waste to prepare granular recycled coarse aggregates of which the dimension is smaller than 10mm; (3) performing mechanical enhancement on the recycled coarse aggregates, adding natural sand into the recycled coarse aggregates according to a weight ratio of 1:(0.2 to 1), and taking fine sand, which has the particle size of 0.25-0.5 mm, in the mechanically enhanced aggregates for later use. According to the method, the building blocks are high in bonding strength and uniform, the water absorption property of a single unit is reduced, the production cost is lowered, and the production technology is simple and feasible.
Description
Technical field
The present invention relates to adopt building waste to manufacture the method for building materials, relate in particular to a kind of method of utilizing building waste to prepare foam concrete block, belong to environmental protection and construction wall heat insulating material technical field.
Background technology
China is in the economic construction high-speed developing period, and the annual solid construction waste material producing has reached several hundred million tons, and the overwhelming majority, all without any processing, is air storage or landfill substantially, causes the wasting of resources and environment pollution.Building waste (waste concrete building waste and brick mixed building rubbish) proportion maximum in all kinds of building waste total amounts is the main object that current construction refuse resource is disposed and utilized.At present, waste concrete building waste and brick mixed building rubbish are mainly processed into regenerated coarse aggregate and recycled fine aggregate, for the production of the inorganic compound in concrete, mortar, concrete block, concrete brick and highway construction.Regeneration aggregate corner angle that simple crushing building waste obtains are many, also contain hardened cement mortar in rough surface, component, add concrete block in shattering process because damage accumulation causes a large amount of micro-cracks in inside, cause the porosity of construction refuse regenerated aggregate self large, water absorption rate is large, pile up that void content is large, crush index value is high, bulk density is little, performance is obviously inferior to natural aggregate.Limit the scope of application of construction refuse regenerated material, restricted development and the technical level of present stage construction refuse resource industry.
Along with the enforcement that deepens constantly of national environmental protection and sustainable development policy, how by construction refuse resource utilization, realize the strengthening of construction refuse regenerated aggregate, improve the high value added utilization of construction refuse regenerated aggregate, become great technology and society problem.
At present, the hollow brick using in China's building operations and building block are ordinary concrete hollow block mostly, and its heat insulating and sound insulating is poor, and in building construction, easily mortar is infiltrated hollow in, easily make body of wall bonding not full.Polyphenyl foam sandwich building block, because polyphenyl foam material exposes easy generation disaster hidden-trouble, and application life is generally shorter, promotes the use of and has obtained restriction.In addition, polyphenyl foam sandwich building block is generally that polyphenyl foam is first made into and the cylinder of the hollow cooperation of building-block, then clogs in the cavity of building block complicated construction technique.The foam concrete block that adopts physical blowing technique to prepare, exists early strength development compared with shortcomings such as slow, low strength, water absorption rate are large, easy to crack.Therefore building trade is badly in need of one and was both incubated, sound insulation, fire prevention again, durable, easily build by laying bricks or stones, building block that integrated cost is low.
Therefore, realize the intensive treatment of construction refuse regenerated aggregate, utilize the construction refuse regenerated aggregate after strengthening to prepare high performance composite heat insulation block, significant for the technological progress that promotes national sustainable development policy and building material industry.
For this reason, in the prior art, existing prepare with building waste the technology that regeneration aggregate carries out shaping and disclose.Title " construction refuse regenerated aggregate trimmer as disclosed in State Intellectual Property Office, application number: 201210377694.1, the applying date: 2012-09-27 " patented technology, the document discloses a kind of construction refuse regenerated aggregate trimmer, its mechanism is to utilize metal roller and helical blade wherein, building waste coarse aggregate is processed, aggregate is subject to the effect of variable-pitch auger blade in cylindrical drum, each other and and cylindrical drum inwall and blade between collision friction repeatedly, the cement mortar of removing the corner angle on it and not come off, realize the shaping strengthening of aggregate, flow out finally by taper discharge barrel.Find through test, this technology is for certain effect that truly has of the cement mortar adhering on removal aggregate body (monomer) corner angle, aggregate.But it is perhaps also not obvious to adopt this technology to prepare solid brick, but make the insulating brick of environment-friendly type and have following problem: adopt regeneration aggregate that this technology makes cannot meet the needs of foam process, its insulation blocks intensity of preparing is well below national standard.We find that main cause is that it (is mainly to rub between monomer and monomer that (passivation) processing is in fact effectively strengthened on regeneration aggregate entirety uniformity surface inadequate, aggregate body (monomer) by analysis, few with the monomer ratio that blade can contact with metal barrel), finally make the aggregate body that this kind of technique makes there will be stress concentration phenomenon (as shown in Figure 9 in the time of framework foamed bricks body microstructure, when the sharp corners of aggregate monomer is during towards bubble 7 and close together, very easily form stress and concentrate, form crack 8).In addition because surface does not obtain in fact Passivation Treatment, the water absorption rate of monomer is also higher, also can affect end properties.
Summary of the invention
The present invention is directed to above problem, provide one to maximize and optimized regrown material performance, and then guarantee the processing method of the building waste foamed concrete composite heat insulation block of finished product resistance to compression, shearing resistance, heat-insulating property.
Technical scheme of the present invention is: described building block comprises having the matrix of hollow cavity and be filled in the thermal-insulation core in described hollow cavity, described building block preparation process comprises matrix moulding, core body preparation, maintenance and drying process, the regeneration aggregate that described matrix includes cement, active mixed material, modifier and prepares taking building waste as raw material;
The processing method of described regeneration aggregate is:
1), the classification of building waste and tentatively sorting, retain wherein waste concrete building waste and brick mixed building rubbish, stand-by;
2), building waste thick broken, described waste concrete building waste and brick mixed building rubbish are slightly broken with jaw crusher, make the graininess regenerated coarse aggregate that size is less than 10mm;
3), regenerated coarse aggregate mechanical enhancer, to the weight ratio admixture natural sand of pressing 1:0.2-1 in regenerated coarse aggregate, described natural sand comprises the medium sand that is of a size of 0.35-0.5mm, utilize the hard sand grains of described natural sand as broken carrier, use stirring or shot blasting equipment that described regenerated coarse aggregate is carried out in small, broken bits together with natural sand, cement mortar and the grain corner of removing described regenerated coarse aggregate surface adhesion by mutual shock, ablation between granular material, make mechanical enhancer aggregate;
By stand-by the middle fine sand of particle diameter 0.25-0.5mm in described mechanical enhancer aggregate;
Particle diameter in described mechanical enhancer aggregate is greater than to the material repetitive cycling utilization of 0.5mm;
By stand-by the powder fine sand that is less than 0.25mm in described mechanical enhancer aggregate.
In described natural sand, also comprise the coarse sand that is of a size of 0.5-3mm.
Further carry out chemical enhanced to described middle fine sand, describedly chemical enhancedly be: utilize organic slurry to process recycled fine aggregate, after adopting organic slurry to regeneration aggregate dipping, drain or organic slurry is sprayed to regeneration aggregate surface, make slurry infiltration in the gap and micro gap of regenerated coarse aggregate surface course, produce mechanical engagement and tessellation, by microscopic checks filling, bonding, after solidifying, combination firmly, and after air-dry, be solidified into one deck organic film at aggregate surface, reduce the water absorbing properties of regeneration aggregate; Described organic slurry is a kind of or several composite arbitrarily in acrylic resin, vinyl acetate-ethylene copolymerization emulsions or styrene-butadiene emulsion.
Described matrix molding procedure is: by recycled fine aggregate 15-40 weight portion, cement 20-30 weight portion, active mixed material 10-40 weight portion, modifier 0.5-1.2 weight portion and water 20-30 weight portion mixing and stirring after strengthening, after adding blowing agent, stir again, be poured into mould, excision " crust " after chemical blowing completes, the hollow matrix of producing foamed concrete block;
Described active mixed material is one or any several mixtures such as flyash, silicon ash, ground slag, kaolin;
Described modifier is one or any several mixtures such as early strength admixture, accelerating admixture, foam stabilizer, waterproof agent, reinforcing agent, antimitotic agent.
Described " crust " pulverized to the multiplexing powder that is less than 0.25mm for particle diameter, stand-by.
Core body preparation section is:
By described powder fine sand 5-10 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.5 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.
Core body preparation section is:
By described multiplexing powder 5-15 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.0 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.
Core body preparation section is:
By described multiplexing powder 5-12 weight portion, powder fine sand 5-18 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.0 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.
Described maintenance operation is: adopt natural curing or stream curing;
Described stream curing curing temperature is 40 DEG C-90 DEG C, and curing time is 4h-12h, and then natural curing is to 25-28 days;
Described natural curing is maintenance 25-28 days under field conditions (factors).
Described drying process is: by overdue maintenance building waste foamed concrete composite heat insulation block in forced air drying indoor seasoning, drying room temperature is 40 DEG C-90 DEG C, drying time reaches respective country with the relative moisture content of building waste foamed concrete composite heat insulation block or industry standard is as the criterion, cooled building waste foamed concrete composite heat insulation block adopts Polypropylence Sheet packaging, when stacking, should have rainproof, moisture preventive measure.
The present invention compared with prior art, has the following advantages:
1), regeneration aggregate is mixed and carries out mechanical enhancer with the natural aggregate of hard, utilize organic slurry to infiltrate pretreatment to regeneration aggregate, the surface texture that has improved regeneration aggregate makes its basic mechanical properties approach natural aggregate.Especially mechanical enhancer measure of the present invention, adopt hardness, the higher natural sand of intensity is as carrier (last part natural sand is as one of component of building block of the present invention), with respect in prior art being mainly the phase mutual friction utilizing between material of the same race, clash into, the present invention utilizes the passivation (sclerosis of the natural gravel of hard to regeneration aggregate monomer surface, polishing) process, make each surface of every monomer all have an opportunity to accept the friction of natural gravel, clash into, make every monomer not only surface blemish processed, surface has obtained effective Passivation Treatment simultaneously, make the bond strength of monomer and cement higher, more even, the water imbibition of monomer reduces.
2), utilize the solid waste such as building waste, useless brick and tile to prepare foam concrete block matrix, significantly reduce cost of production, saved because of building waste and piled up the soil taking, reduced environment pollution, realize the recycling of building waste, saved natural resource.After " crust " excision of foam concrete block matrix, pulverizing is used for preparing foaming cement thermal insulation core body again, and secondary utilizes building waste, further realizes the recycling of building waste.
3), the processing method of building block of the present invention is for first preparing the hollow matrix of foam concrete block, then makes thermal-insulation core to filling-foam cement in foam concrete block cavity, make the two effectively cementing being integrated, and production technology is simple.
4), compared with the building block of other kinds, prepare building block matrix and thermal-insulation core owing to all adopting chemical blowing method, the features such as this building block has that lightweight, intensity are high, good heat insulating, durable and good application property are a kind of novel wall building materials of structure-function integration.
After testing, the building waste foam concrete block matrix dry apparent density making according to technical solution of the present invention is 1200kg/m
3, cubic compressive strength 12.0MPa, coefficient of thermal conductivity 0.2755W/ (mk).Foaming cement thermal insulation core body dry apparent density 230kg/m
3, cubic compressive strength is 0.24MPa, coefficient of thermal conductivity is 0.0550W/ (mK).Building waste foamed concrete composite heat insulation block dry apparent density of the present invention is 750kg/m
3, strength grade reaches MU3.5, and average thermal resistance is 1.520 (m
2k)/W.
Brief description of the drawings
Fig. 1 is the structural representation of manufactured goods of the present invention,
Fig. 2 is the schematic diagram of matrix molding procedure one in the present invention,
Fig. 3 is the schematic diagram of matrix molding procedure two in the present invention,
Fig. 4 is the schematic diagram of matrix molding procedure three in the present invention,
Fig. 5 is the schematic diagram of core forming technique one in the present invention,
Fig. 6 is the schematic diagram of core forming technique two in the present invention,
Fig. 7 is the schematic diagram of regenerated coarse aggregate mechanical enhancer in the present invention,
Fig. 8 is the microstructure schematic diagram of manufactured goods of the present invention,
Fig. 9 is the microstructure schematic diagram of prior art products of the present invention;
In figure, 1 is matrix, the 11st, and crust, the 2nd, core body, the 21st, core body crust, the 3rd, matrix moulding form, the 4th, regenerated coarse aggregate, the 41st, middle fine sand, the 5th, natural sand, the 6th, mixing plant, the 7th, bubble, the 8th, crack.
Detailed description of the invention
The present invention is as shown in Fig. 1-8, building block comprises having the matrix 1 of hollow cavity and be filled in the thermal-insulation core (as Fig. 1) 2 in hollow cavity 1, described building block preparation process comprises matrix moulding, core body preparation, maintenance and drying process, the regeneration aggregate that described matrix includes cement, active mixed material, modifier and prepares taking building waste as raw material;
The processing method of described regeneration aggregate is:
1), the classification of building waste and tentatively sorting, retain wherein waste concrete building waste and brick mixed building rubbish, stand-by;
2), building waste thick broken, described waste concrete building waste and brick mixed building rubbish are slightly broken with jaw crusher, make the graininess regenerated coarse aggregate that size is less than 10mm;
3), regenerated coarse aggregate mechanical enhancer, to the weight ratio admixture natural sand 5 of pressing 1:0.2-1 in regenerated coarse aggregate 4, described natural sand 5 comprises the medium sand that is of a size of 0.35-0.5mm, utilize the hard sand grains of described natural sand as broken carrier, use stirring or shot blasting equipment (taking mixing plant 6 as example) that described regenerated coarse aggregate 4 is carried out in small, broken bits together with natural sand 5, cement mortar and the grain corner of removing described regenerated coarse aggregate surface adhesion by mutual shock, ablation between granular material, make mechanical enhancer aggregate; As shown in Figure 7;
Herein, natural sand can fully contact with building waste therein, its effect is: remove the corner angle of granular building waste, in conjunction with after loose material (as cement mortar), after guaranteeing that manufactured goods solidify, bond strength between particle, cement, avoid stress to concentrate, and then improve the mechanical strength (resistance to compression, anti-shearing) of building block entirety; In addition, the natural gravel of hard plays induration to building waste surface (such as the particle after fragment of brick division), and then reduces its water absorption rate;
By stand-by the middle fine sand 41 of particle diameter 0.25-0.5mm in described mechanical enhancer aggregate;
Particle diameter in described mechanical enhancer aggregate is greater than to the material repetitive cycling utilization of 0.5mm;
By stand-by the powder fine sand that is less than 0.25mm in described mechanical enhancer aggregate.
In described natural sand, also comprise the coarse sand that is of a size of 0.5-3mm.Add the object of coarse sand and be mainly the linear velocity solving while interaction between hard abrasive material (being natural gravel) and material (building waste monomer) and there is certain velocity interval, and then can carry out comprehensive processing to the different flaws of material.Such as, corner angle need the CONTACT WITH FRICTION of fast speed, and crack need to be compared with jogging speed, the contact of large " moment of torsion ", and the attachment (cement mortar) on material needs impact, the vibration of friction speed.
Further carry out chemical enhanced to described middle fine sand, describedly chemical enhancedly be: utilize organic slurry to process recycled fine aggregate, after adopting organic slurry to regeneration aggregate dipping, drain or organic slurry is sprayed to regeneration aggregate surface, make slurry infiltration in the gap and micro gap of regenerated coarse aggregate surface course, produce mechanical engagement and tessellation, by microscopic checks filling, bonding, after solidifying, combination firmly, and after air-dry, be solidified into one deck organic film at aggregate surface, reduce the water absorbing properties of regeneration aggregate; Described organic slurry is a kind of or several composite arbitrarily in acrylic resin, vinyl acetate-ethylene copolymerization emulsions or styrene-butadiene emulsion.Make slurry infiltration in the gap and micro gap of regenerated coarse aggregate surface course, produce mechanical engagement and tessellation, by microscopic checks filling, bonding, after solidifying, combination firmly, and after air-dry, be solidified into one deck organic film at aggregate surface, reduce the water absorbing properties of regeneration aggregate.Slurries by aggregate microscopic checks fill, bonding, be solidified into one deck organic film at aggregate surface after air-dry, reduce the water absorbing properties of regeneration aggregate.Because water absorption rate directly affects the workability of mixture and the drying shrinkage of later stage building block is played to decisive influence, so the reduction of water absorption rate is the important indicator of evaluating treatment effect.
The good fluidity of acrylic resin itself, at room temperature can solidify in the shorter time, regeneration aggregate is infiltrated to acrylic resin slurries 0.5 h, then air-dry at ambient temperature, membrane structure even thickness after solidifying, energy and closely combination of aggregate, obviously reduce aggregate water absorption rate to 2.63%, approaches natural aggregate water absorption rate.
Vinyl acetate-ethylene copolymerization emulsions, because viscosity is too high, mobility is poor, therefore mix 10% water dilution, adds 0.1-0.5% cellulose, and cellulose has good adhesion effect, can keep even, the stability of aqueous polymer dispersion.Regeneration aggregate is infiltrated in the emulsion after dilution and soaks 2h, then air-dry at ambient temperature.Vinyl acetate-ethylene copolymerization emulsions has good film forming, and the membrane structure after solidifying is evenly good.Reduce aggregate water absorption rate to 6.75%.
The good fluidity of styrene-butadiene emulsion itself, infiltrates regeneration aggregate in emulsion and soaks 2h, then air-dry at ambient temperature.Membrane structure after solidifying is evenly good.
For the consumption of above chemical enhanced reagent, when those skilled in the art can be according to practical application, aridity, the climatic factor of material are selected, and repeat no more herein.
Described matrix molding procedure is: by recycled fine aggregate 15-40 weight portion, cement 20-30 weight portion, active mixed material 10-40 weight portion, modifier 0.5-1.2 weight portion and water 20-30 weight portion mixing and stirring after strengthening, after adding blowing agent, stir again, be poured into mould (being matrix moulding form 3), excision " crust " 11 after chemical blowing completes, the hollow matrix of producing foamed concrete block, as in Figure 2-4;
Described active mixed material is one or any several mixtures such as flyash, silicon ash, ground slag, kaolin;
Described modifier is one or any several mixtures such as early strength admixture, accelerating admixture, foam stabilizer, waterproof agent, reinforcing agent, antimitotic agent.
In view of the use amount of other component in aforementioned substrates moulding, those skilled in the art can independently adjust according to requirements in above-mentioned scope, repeat no more herein.
Described " crust " pulverized to the multiplexing powder that is less than 0.25mm for particle diameter, stand-by.
Core body preparation section has following three kinds of embodiment (as shown in Figure 5,6):
First:
By described powder fine sand 5-10 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.5 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.The leftover materials of the present embodiment after to building waste mechanical enhancer have carried out sufficient utilization.
Second:
By described multiplexing powder 5-15 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.0 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.The crushed material of the crust of the present embodiment after to matrix moulding has carried out sufficient utilization.
The 3rd:
By described multiplexing powder 5-12 weight portion, powder fine sand 5-18 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.0 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.The crushed material of the leftover materials of the present embodiment after to building waste mechanical enhancer and the crust after matrix moulding fully utilizes.
Control to blowing agent when above three kinds of embodiment key points are to operate, solidifies rear core body density as using the standard of blowing agent to control.This point, those skilled in the art, according to enlightenment of the present invention, can obtain after testing.
Described maintenance operation is: adopt natural curing or stream curing;
Described stream curing curing temperature is 40 DEG C-90 DEG C, and curing time is 4h-12h, and then natural curing is to 25-28 days;
Described natural curing is maintenance 25-28 days under field conditions (factors).
Described drying process is: by overdue maintenance building waste foamed concrete composite heat insulation block in forced air drying indoor seasoning, drying room temperature is 40 DEG C-90 DEG C, drying time reaches respective country with the relative moisture content of building waste foamed concrete composite heat insulation block or industry standard is as the criterion, cooled building waste foamed concrete composite heat insulation block adopts Polypropylence Sheet packaging, when stacking, should have rainproof, moisture preventive measure.
The present invention is directed to the weak point of lower, the existing heat insulating type concrete one hand tile of China's building waste level of comprehensive utilization and production technology thereof, provide a kind of thermal property good, do not fire, good endurance, economic and practical building waste foamed concrete composite heat insulation block and processing method thereof, to improve the added value of building waste comprehensive utilization, improve China's building waste in walling industry level of comprehensive utilization, realize the utilization of construction refuse resource scale.The effect of performance energy-saving and emission-reduction, protection of the environment, meet develop a circular economy, low-carbon economy and social sustainable development strategic demand.Compared with prior art have the following advantages: after adopting regeneration aggregate to mix with natural aggregate, infiltrate pretreated method through mechanical enhancer and organic slurry and improve the surface texture of regeneration aggregate and make its basic mechanical properties approach natural aggregate; After the solid waste break process such as building waste, useless brick and tile, prepare foam concrete block matrix, after " crust " excision of foam concrete block matrix, pulverizing is used for preparing foaming cement thermal insulation core body again, secondary utilizes building waste, significantly reduce cost of production, save and piled up the soil taking because of building waste, reduce environment pollution, realized the recycling of building waste.The advantages such as building block of the present invention has that lightweight, intensity are high, good heat insulating and good application property.Can be widely used in building frame structure external and internal wall, villages and small towns Discussion on architecture body of wall etc.
Claims (10)
1. the processing method of a building waste foamed concrete composite heat insulation block, described building block comprises having the matrix of hollow cavity and be filled in the thermal-insulation core in described hollow cavity, described building block preparation process comprises matrix moulding, core body preparation, maintenance and drying process, the regeneration aggregate that described matrix includes cement, active mixed material, modifier and prepares taking building waste as raw material;
It is characterized in that, the processing method of described regeneration aggregate is:
1), the classification of building waste and tentatively sorting, retain wherein waste concrete building waste and brick mixed building rubbish, stand-by;
2), building waste thick broken, described waste concrete building waste and brick mixed building rubbish are slightly broken with jaw crusher, make the graininess regenerated coarse aggregate that size is less than 10mm;
3), regenerated coarse aggregate mechanical enhancer, to the weight ratio admixture natural sand of pressing 1:0.2-1 in regenerated coarse aggregate, described natural sand comprises the medium sand that is of a size of 0.35-0.5mm, utilize the hard sand grains of described natural sand as broken carrier, use stirring or shot blasting equipment that described regenerated coarse aggregate is carried out in small, broken bits together with natural sand, cement mortar and the grain corner of removing described regenerated coarse aggregate surface adhesion by mutual shock, ablation between granular material, make mechanical enhancer aggregate;
By stand-by the middle fine sand of particle diameter 0.25-0.5mm in described mechanical enhancer aggregate;
Particle diameter in described mechanical enhancer aggregate is greater than to the material repetitive cycling utilization of 0.5mm;
By stand-by the powder fine sand that is less than 0.25mm in described mechanical enhancer aggregate.
2. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 1, is characterized in that, also comprises the coarse sand that is of a size of 0.5-3mm in described natural sand.
3. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 1 and 2, it is characterized in that, further carry out chemical enhanced to described middle fine sand, describedly chemical enhancedly be: utilize organic slurry to process recycled fine aggregate, after adopting organic slurry to regeneration aggregate dipping, drain or organic slurry is sprayed to regeneration aggregate surface, make slurry infiltration in the gap and micro gap of regenerated coarse aggregate surface course, produce mechanical engagement and tessellation, microscopic checks is filled, bonding, after solidifying, combination firmly, and be solidified into one deck organic film at aggregate surface after air-dry, reduce the water absorbing properties of regeneration aggregate, described organic slurry is a kind of or several composite arbitrarily in acrylic resin, vinyl acetate-ethylene copolymerization emulsions or styrene-butadiene emulsion.
4. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 1 and 2, it is characterized in that, described matrix molding procedure is: by recycled fine aggregate 15-40 weight portion, cement 20-30 weight portion, active mixed material 10-40 weight portion, modifier 0.5-1.2 weight portion and water 20-30 weight portion mixing and stirring after strengthening, after adding blowing agent, stir again, be poured into mould, excision " crust " after chemical blowing completes, the hollow matrix of producing foamed concrete block;
Described active mixed material is one or any several mixtures such as flyash, silicon ash, ground slag, kaolin;
Described modifier is one or any several mixtures such as early strength admixture, accelerating admixture, foam stabilizer, waterproof agent, reinforcing agent, antimitotic agent.
5. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 4, is characterized in that, described " crust " is pulverized to the multiplexing powder that is less than 0.25mm for particle diameter, stand-by.
6. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 1 and 2, is characterized in that, core body preparation section is:
By described powder fine sand 5-10 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.5 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.
7. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 5, is characterized in that, core body preparation section is:
By described multiplexing powder 5-15 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.0 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.
8. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 5, is characterized in that, core body preparation section is:
By described multiplexing powder 5-12 weight portion, powder fine sand 5-18 weight portion, cement 70-85 weight portion, active mixed material 10-20 weight portion and modifier 0.5-1.0 weight portion mixing and stirring, after adding blowing agent, stir again, inject the hollow cavity of described matrix, again must be contour and smooth with described matrix end face by surfacing, make described core body and matrix cementing as a whole; The addition of described blowing agent is no more than 300 kg/m to control the density of described core body
3be as the criterion.
9. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 1, is characterized in that, described maintenance operation is: adopt natural curing or stream curing;
Described stream curing curing temperature is 40 DEG C-90 DEG C, and curing time is 4h-12h, and then natural curing is to 25-28 days;
Described natural curing is maintenance 25-28 days under field conditions (factors).
10. the processing method of a kind of building waste foamed concrete composite heat insulation block according to claim 1, it is characterized in that, described drying process is: by overdue maintenance building waste foamed concrete composite heat insulation block in forced air drying indoor seasoning, drying room temperature is 40 DEG C-90 DEG C, drying time reaches respective country with the relative moisture content of building waste foamed concrete composite heat insulation block or industry standard is as the criterion, cooled building waste foamed concrete composite heat insulation block adopts Polypropylence Sheet packaging, when stacking, should have rainproof, moisture preventive measure.
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