CN108558303A - A kind of regeneration concrete bulk and its production method - Google Patents
A kind of regeneration concrete bulk and its production method Download PDFInfo
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- CN108558303A CN108558303A CN201810043615.0A CN201810043615A CN108558303A CN 108558303 A CN108558303 A CN 108558303A CN 201810043615 A CN201810043615 A CN 201810043615A CN 108558303 A CN108558303 A CN 108558303A
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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
- C04B28/04—Portland 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
- C04B18/00—Use of agglomerated or waste materials or refuse as fillers for mortars, concrete or artificial stone; Treatment of agglomerated or waste materials or refuse, specially adapted to enhance their filling properties in mortars, concrete or artificial stone
- C04B18/04—Waste materials; Refuse
- C04B18/16—Waste materials; Refuse from building or ceramic industry
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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
- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/246—Cements from oil shales, residues or waste other than slag from waste building materials, e.g. waste asbestos-cement products, demolition waste
-
- 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
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/10—Production of cement, e.g. improving or optimising the production methods; Cement grinding
-
- 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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
- Processing Of Solid Wastes (AREA)
Abstract
The present invention provides a kind of formulas preparing regeneration concrete bulk using high activity regenerated powder and recycled aggregate.Invention further provides a kind of production methods based on regeneration concrete bulk under " regenerated powder regenerated coarse aggregate recycled fine aggregate " system.The present invention utilizes regeneration concrete bulk made from " regenerated powder regenerated coarse aggregate recycled fine aggregate " regeneration concrete system that there is excellent mechanical strength, strength grade range to meet the requirement of concrete bulk intensity under different operating modes from 5 50MPa.The present invention provides new development path for the recycling of building waste.Simultaneously, since the mineral admixtures performances such as regenerated powder performance and flyash are similar, there is higher activity, the secondary reaction of hydration of cement-based material can be promoted, and then alleviate the present situation of the mineral admixtures such as flyash insufficient supply at this stage, there is higher economic benefit and social benefit.
Description
Technical field
The invention belongs to civil engineering material technical fields, more particularly, to a kind of regeneration concrete bulk and its producer
Method.
Background technology
Waste concrete and useless common brick in building waste account for about the 80% of building waste total amount, to waste concrete and useless common brick
It is the effective way for reducing building waste total amount to carry out disposal of resources production regenerative raw materials.At this stage, the regeneration of China's production
Raw material be mainly grain size the recycled fine aggregate of 0.15-5mm and grain size 5-31.5mm regenerated coarse aggregate.That is, by useless coagulation
Native and useless common brick produces the recycled aggregate of different gradation after crushing, cleaning and grading, by regenerated coarse aggregate part or entirely
The concrete that portion replaces the natural aggregates such as sandstone to be configured to becomes regenerated aggregate concrete；Regenerated aggregate concrete is as novel green
Color environmental-friendly construction material reduces demand of the construction industry to natural resources, can effectively be expired using regenerated coarse aggregate concrete
The requirement of sufficient Sustainable Construction Industry.But since recycled aggregate adheres to the presence of old mortar and the old and new interfacial transition zone, drop
The low mechanical property and endurance quality of prepared regenerated aggregate concrete, recycled aggregate is mostly used for low-intensity in Practical Project
The preparation of concrete, added value are relatively low.At this stage, regenerative raw materials and regeneration of the research and development with high-performance high added value are badly in need of in China
Product, and then promote the fast development of construction refuse resource industry.
Moreover, China's waste material of buildings recycling efficiency, still in reduced levels, China in Recent Years waste material of buildings provides according to statistics
Source efficiency is about 5-10%, far below developed countries' (buildings and resources rate can reach 90%) such as American-European countries and Japan, institute
Urgently to develop a kind of building material product that can largely dissolve waste material of buildings recycling regenerative raw materials, changes existing utilize and regenerate
Aggregate substitution natural aggregate and then the recycling single-mode for preparing regeneration concrete.
With the fast development of building trade, the demand of the mineral admixtures such as flyash is increased year by year, but I
The production capacity of state's flyash was held essentially constant in recent years, and flyash has been in the state that supply falls short of demand, need to develop it is a kind of with
Flyash has the mineral admixture of similar performance.To promote the development of green regenerating building materials, should develop a kind of can both replace
For cementitious material in concrete, and the regeneration concrete system of wherein aggregate can be substituted.Simultaneously, it is contemplated that China's brick and building block
Class bulk demand is huge, and simple production process, and the preparation that regenerative raw materials are applied to concrete bulk can be with maximum limit
Degree meets recycling requirement, realizes " regeneration " truly.
Invention content
In view of the foregoing deficiencies of prior art, insufficient in conjunction with China's construction refuse resource industry and flyash
Problem, the purpose of the present invention is to provide a kind of active regeneration powders prepared using building waste and regeneration coarse-fine aggregate, will
Active regeneration powder is used as cementitious material, and regeneration coarse-fine aggregate substitutes natural coarse-fine aggregate respectively, matches with other components
It closes, to prepare regeneration concrete bulk.Low, waste utilization rate that another object of the present invention is to provide a kind of production costs
Height, added value is high, simple for process, stress performance is good, the production method of environmentally protective regeneration concrete bulk.
The present invention adopts the following technical scheme that realize above-mentioned purpose：
The present invention provides a kind of formulas of regeneration concrete bulk, and in parts by weight, the formula includes following components：
Preferably, the formula of a kind of regeneration concrete bulk, in parts by weight, the formula includes following components：
It is highly preferred that the formula of the regeneration concrete bulk, in parts by weight, the formula includes following components：
Preferably, the regeneration concrete bulk is selected from regeneration brick or builds one kind in the block.
Preferably, any one of the cement in portland cement or Portland cement.The ordinary silicon
Made of acid salt cement is the mixing material that 6~20% are added in Portland clinker, proper amount of gypsum is levigate.It is described common
Portland cement because mixed mixing material is less, ingredient and portland cement relatively, so the performance of the two
Relatively, it can replace under certain conditions, will such as seek quickness hard, high-strength concrete, and ordinary priority uses silicate cement
Mud, can also be used Portland cement, and the scope of application of Portland cement is more extensive.
Preferably, strength grade >=32.5 grade of the cement.It is highly preferred that strength grade >=42.5 of the cement
Grade.
Preferably, the active regeneration powder is the fineness powder that building castoff is broken for grain size≤75 μm.
It is highly preferred that in the active regeneration powder, the active regeneration powder of grain size≤45 μm accounts for total active regeneration powder
Mass percent >=50% of body.
It is further preferred that in the active regeneration powder, the active regeneration powder of grain size≤45 μm accounts for total activity again
Mass percent >=88% of fecula body.
It is further preferred that in the active regeneration powder, the active regeneration powder of grain size≤30 μm accounts for total activity
Mass percent >=95% of regenerated powder.
Preferably, the active regeneration powder is in completely dried state, and the completely dried state is by active regeneration
Powder is placed in drying box at 100-110 DEG C drying for 24 hours and the mass change ＜ 0.1% of active regeneration powder.
Preferably, the natural fine aggregate is the natural river sand of grain size 0.15-5mm.
Preferably, the recycled fine aggregate is the building castoff that building castoff is broken for grain size 0.15-5mm
Grain.
Preferably, the fineness modulus of the natural fine aggregate and recycled fine aggregate is 2.3-3.0, clay content 0.8-
1.0%, clod content is 0.1-0.8%.
Preferably, the natural coarse aggregate is the basaltic broken stone or granite stones of grain size 5-31.5mm.
It is highly preferred that the grain size of the natural coarse aggregate is in 5-25mm continuous gradings.
Preferably, the regenerated coarse aggregate is the building castoff that building castoff is broken for grain size 5-31.5mm
Grain.
It is highly preferred that the regenerated coarse aggregate is in 5-25mm continuous gradings.
It is further preferred that the grain size of the regenerated coarse aggregate is in 5-20mm continuous gradings.
It is highly preferred that the building castoff includes waste concrete and useless common brick.
It is further preferred that the mass percent that the useless common brick accounts for building castoff is 10-80%.
It is further preferred that the mass percent that the useless common brick accounts for building castoff is 30-50%.
It is further preferred that green strength grade >=C20 of the waste concrete.
It is further preferred that green strength grade >=MU5.0 of the useless common brick.
It is further preferred that the impurity content ＜ 0.1% in the building castoff.
Preferably, the water is tap water.
Preferably, the water-reducing agent is polycarboxylate water-reducer.The polycarboxylate water-reducer can be efficient for slow setting, pump
It send.Specifically, the water-reducing agent is the SBTJM-10 type polycarboxylic acids produced by Jiangsu Subotexin Material Co., Ltd
Water-reducing agent.
It is highly preferred that the active regeneration powder when grain size≤45 μm accounts for active regeneration powder gross mass percentage >=50%
When, in the formula of regeneration concrete bulk, it need to additionally increase and account for the diminishing that active regeneration powder gross mass percentage is 0.5%
Agent.
It is further preferred that when grain size≤45 μm active regeneration powder account for active regeneration powder gross mass percentage >=
When 88%, in the formula of regeneration concrete bulk, it need to additionally increase and account for active regeneration powder gross mass percentage as 1.0%
Water-reducing agent.
It is further preferred that when grain size≤30 μm active regeneration powder account for active regeneration powder gross mass percentage >=
95%, in the formula of regeneration concrete bulk, it need to additionally increase that account for active regeneration powder gross mass percentage be 1.5% to subtract
Aqua.
Invention further provides a kind of production methods of regeneration concrete bulk, specifically include following steps：
1) each component is taken by formulation ratio, it is first that the cement in formula, active regeneration powder, natural fine aggregate, regeneration is thin
Aggregate, natural coarse aggregate, regenerated coarse aggregate are invested in blender after progress first time stirring, then water and water-reducing agent are invested in
It carries out stirring for second in blender, obtains mixture；
2) by mixture obtained by step 1), poured, be molded after demould, then to get required regeneration after being conserved
Concrete bulk.
Preferably, in step 1), the regenerated coarse aggregate is sieved after building castoff is carried out first break processing
It obtains.
It is highly preferred that the first break processing is crushed using jaw crusher.
Preferably, in step 1), the recycled fine aggregate is sieved after regenerated coarse aggregate is carried out second of break process
It obtains.
It is highly preferred that second of break process is crushed using impact breaker.
Preferably, in step 1), the active regeneration powder is to be ground after drying recycled fine aggregate, sieve and obtain
.
It is dried it is highly preferred that the drying is heat blowing.
It is highly preferred that described be ground to be ground using ball mill.
It is highly preferred that the screening is the high-strength shaking-sieving of machinery.
It is highly preferred that according to the grain size of the active regeneration powder, the additional dosage for increasing water-reducing agent is determined.
Preferably, in step 1), before the recycled fine aggregate and regenerated coarse aggregate progress mix, surface saturation plane is carried out
Dry-cure.The surface saturation plane dry-cure refers to, before mix, is satisfied to recycled fine aggregate and regenerated coarse aggregate with clear water
And surface treatment, so that its surface relative humidity is reached 100%.
Preferably, in step 1), the mixing time of the first time stirring is 1-3 minutes.It is highly preferred that the first time
The mixing time of stirring is 2 minutes.
Preferably, in step 1), mixing time >=2 minute of second of stirring.It is highly preferred that described second
The mixing time of stirring is 3 minutes.
Preferably, in step 1), the blender is conventional use of blender, commercially available acquisition.
Preferably, in step 1), the slump of the mixture is 10-200mm.It is highly preferred that the mixture collapses
Degree of falling is 50-150mm.It is further preferred that the slump of mixture is 80-120mm.
Preferably, in step 2), the molding mode is mechanical compression molding.
It is highly preferred that the mechanical pressure is 20-50kpa.
Preferably, in step 2), the temperature for pouring scene is not less than 10 DEG C, and relative humidity is not less than 50%.It is more excellent
Selection of land, the temperature for pouring scene are not less than 20 DEG C, and relative humidity is not less than 70%.
Preferably, in step 2), the maintenance is combined selected from one or both of natural curing or wet curing.
It is highly preferred that the temperature of the natural curing is not less than 5 DEG C, maintenance humidity (relative humidity) is not less than 60%, supports
The shield time is no less than 14 days.
It is highly preferred that the temperature of the wet curing be not less than 5 DEG C, maintenance humidity (relative humidity) be not less than 95%,
Curing time is not less than 14 days.
It is further preferred that the combination of the natural curing and wet curing, curing temperature is 20 ± 2 DEG C, maintenance humidity
(relative humidity) is >=95%, and curing time is 28 days.
Invention still further provides a kind of regeneration concrete bulk, by above-mentioned regeneration concrete bulk formula or on
The production method for stating regeneration concrete bulk prepares.
The regeneration concrete bulk prepared in the present invention has the following advantages：
1) change the single recycled aggregate concrete product production model of tradition, propose that " regenerated powder-recycled fine aggregate-is again
Raw coarse aggregate " regeneration concrete bulk preparation method.It is used as cementitious material using regenerated powder substitution cement, utilizes regeneration
Fine aggregate and regenerated coarse aggregate replace natural fine aggregate and natural coarse aggregate respectively, realize " regeneration " concrete truly
Product can further promote waste material of buildings resource utilization rate.
2) active regeneration powder prepared by the present invention can be used as cementitious material use, and the raw material for preparing active regeneration powder is equal
From building waste, and production cost is low, has higher environmental benefit and economic benefit；It is red in building waste by limiting
The content of brick and the fineness index of grinding ensure that the active regeneration powder prepared has higher activity.Active regeneration powder
It prepares and production, new recycling path is provided for China's construction refuse resource, by disposal of resources by traditional extensive
Type is changed into fining high value-added industries.
3) it is different from the lower characteristic of powder quality that traditional architecture changing waste into resources technique productions go out, it is produced by the invention
Active regeneration powder has the characteristics that high fineness and high activity, and integrated performance index is similar with flyash, can replace fine coal
Ash is used as mineral admixture, alleviates China's insufficient pressure of flyash production capacity at this stage.
4) additional water-reducing agent dosage adjustment is carried out by regenerated powder incorporation, and surface saturation is carried out to recycled aggregate
The dry disposition in face, mating blending craft ensure that regeneration concrete and normal concrete mix workability having the same,
And then ensure that regeneration concrete bulk intensity index is good.
5) simple production process of regeneration concrete bulk, and there is preferable mechanical property and endurance quality, activity is again
The incorporation of fecula body improves regeneration concrete bulk overall quality, before having higher added value and the application of wide market
Scape.
6) present invention provides new development path for the recycling of building waste；By single regenerated aggregate concrete block
Material is changed into the regeneration concrete bulk based on regenerative gel material and recycled aggregate system.Simultaneously as regenerated powder performance
It is similar with the mineral admixtures performance such as flyash, there is higher activity, the secondary reaction of hydration of cement-based material can be promoted,
And then alleviate the present situation of the mineral admixtures such as flyash insufficient supply at this stage, there is higher economic benefit and social benefit.
7) under performance uniform condition, the regeneration concrete bulk in the unit volume present invention is than natural concrete bulk valence
Lattice reduce about 10-20%, and energy consumption and carbon emission amount reduce 15-40%；The more traditional single recycled aggregate of resource utilization rate simultaneously
Concrete bulk can be improved about 30%, and regeneration concrete bulk meets the requirement of China's building material industry Green Sustainable.
Specific implementation mode
The present invention is described in further details with comparative example with reference to embodiment, the present invention can be by others not
The embodiment of its substantive characteristics is detached to realize.Therefore, scheme set forth below only illustrates to illustrate, embodiments of the present invention
It is not limited thereto.
1. raw material and mix-design are as follows used in following instance：
1) cement：P.O42.5 Portland cements.
2) active regeneration powder：I grades of active regeneration powders, the active regeneration powder of grain size≤45 μm are selected to account for active regeneration
Powder gross mass percentage >=88%.Specific performance index is shown in Table 1.From the data in the table, it is less than the tired of 45 μm of grain sizes
Product accounting >=92%, fineness index are better than the requirement of I grades of powders, have higher fineness activity index.
The experiment of table 1 is distributed with active regeneration diameter of particle
3) regenerated coarse aggregate：It is the construction waste composition granule of 5-25mm to select grain size, is met《Concrete regenerates thick bone
Material》The standard of (GB/T25177-2010).
4) natural coarse aggregate：It is the basaltic broken stone of 5-25mm to select grain size, is met《Concrete regenerated coarse aggregate》
The standard of (GB/T25177-2010).
5) natural fine aggregate：It is the natural river sand of 0.15-5mm to select grain size, is met《Concrete and mortar regenerate thin bone
Material》(GB/T25176-2010) middle sand standard.
6) recycled fine aggregate：It is the construction waste composition granule of 0.15-5mm to select grain size, and clay content 0.9%, clod contains
Amount is 0.2%, is met《Concrete and mortar recycled fine aggregate》(GB/T25176-2010) middle sand standard.
5) water：It is tap water.
6) water-reducing agent：SBTJM-10 (slow setting, pumping) type water-reducing agent.
2. the mechanical test method that example is carried out is as follows：
1) compressive strength test
Regeneration concrete test specimen used in compression strength is the cube of 100mm, after test specimen reaches different curing ages, profit
Compressive strength test is carried out with omnipotent mechanics machine, loading speed is 0.5MPa each second, until test specimen destroys, and is recorded
Failing load value.Active regeneration powder concrete crushing strength value can be calculated by formula (1), f in formulacFor the compression strength of test specimen
It is worth (MPa), F is the failing load value (N) applied, AcFor test specimen bearing area (mm2) three test specimen measured values arithmetic average
Intensity value (being accurate to 0.1MPa) as this group of test specimen.
fc=F/Ac (1)
2) flexural strength is tested
Regeneration concrete test specimen used in compression strength is the cuboid of 100mm*100mm*400mm, waits for that test specimen reaches different
After curing age, compressive strength test is carried out using omnipotent mechanics machine, loading speed is 0.05MPa each second, until examination
Part destroys, and records failing load value.Active regeneration powder concrete splitting tensile strength values can be calculated by formula (2), formula
Middle ftFor regenerated powder concrete flexural strength (MPa)；F is test specimen failing load (N)；L span (300mm) between bearing；H is
Test specimen depth of section (100mm)；B is test specimen cross-sectional width (100mm).The arithmetic average of three test specimen measured values is as the group
The intensity value (being accurate to 0.01MPa) of test specimen.
ft=Fl/bh2 (2)
3) tensile splitting strength is tested
Regeneration concrete test specimen used in compression strength is the cube of 150mm, after test specimen reaches different curing ages, profit
Tensile splitting strength experiment is carried out with mechanics universal testing machine, loading speed is 0.05MPa each second, until test specimen destroys, and
Record failing load value.Active regeneration powder concrete splitting tensile strength values can be calculated by formula (3), f in formulatsFor splitting
Tensile strength values (MPa)；F is test specimen failing load (N)；A is test specimen splitting surface area (mm2).The calculation of three test specimen measured values
Intensity value (be accurate to 0.01MPa) of the number average value as this group of test specimen.
fts=0.637F/Ats (3)
Embodiment 1-3 and reference examples 1
By formulation ratio, it is horizontal strong accurately to weigh cement, active regeneration powder, recycled fine aggregate, regenerated coarse aggregate input
Uniform mix is carried out in blender processed, by above-mentioned siccative dry mixing 2min, is continued mix 2min after then mixing water and water-reducing agent, is obtained
Obtain mixture.Wherein, according to the grain size of active regeneration powder, the additional dosage for increasing water-reducing agent；Recycled fine aggregate and regeneration are thick
Surface saturation plane dry-cure is carried out before aggregate mix.
Then, mixture is poured, be molded using mechanical pressure after demould, then to get required after being conserved
Regeneration concrete bulk.Wherein, maintenance is combined selected from one or both of natural curing or wet curing.Finally regenerated
Concrete bulk has 100mm*100mm*100mm, 100mm*100mm*400mm and 150mm*150mm*150mm three types
Test specimen can be used for carrying out the varying strength test of regeneration concrete.Wherein recipe ingredient proportioning be shown in Table 2 in embodiment 1-3.It is synchronous
It takes the component for being not added with active regeneration powder to be mixed with, obtains reference substance, the recipe ingredient proportioning of reference substance is shown in Table in 2
Reference examples 1.
2 regeneration concrete bulk match ratio (kg/m of table3)
Embodiment 4-6
By formulation ratio, cement, active regeneration powder, natural fine aggregate, recycled fine aggregate, the thick bone of regeneration are accurately weighed
Material, natural coarse aggregate, which are put into horizontal forced stirrer, carries out uniform mix, by above-mentioned siccative dry mixing 2min, then mix water and
Continue mix 2min after water-reducing agent, obtains mixture.Wherein, according to the grain size of active regeneration powder, additionally increase water-reducing agent
Dosage；Surface saturation plane dry-cure is carried out before recycled fine aggregate and regenerated coarse aggregate mix.
Then, mixture is poured, be molded using mechanical pressure after demould, then to get required after being conserved
Regeneration concrete bulk.Wherein, maintenance is combined selected from one or both of natural curing or wet curing.Finally regenerated
Concrete bulk has 100mm*100mm*100mm, 100mm*100mm*400mm and 150mm*150mm*150mm three types
Test specimen can be used for carrying out the varying strength test of regeneration concrete.Wherein recipe ingredient proportioning be shown in Table 3 in embodiment 4-6.
3 regeneration concrete bulk match ratio (kg/m of table3) supplementary data
Embodiment 7- Compressive Strength of Recycled Concrete performances
Compressive strength determination is carried out to the sample obtained in above-described embodiment 1-3 and reference examples 1, concrete outcome is shown in Table 4.By
Table 4 show the compressive strength determination value of concrete under different activities regenerated powder incorporation efficiency and different curing ages.By in table 4
It is found that when water-cement ratio is 0.40, concrete crushing strength reduces data with the increase of active regeneration powder Replacement rate, but
It is the strength reduction unobvious when active regeneration powder Replacement rate is 15%-30%；When water-cement ratio is 0.50, curing age is
When 56d, the intensity for the embodiment 1 that active regeneration powder Replacement rate is 15% is slightly above the intensity value of reference examples 1 instead, and living
Property regenerated powder Replacement rate be 30% the intensity of intensity and reference examples 1 of embodiment 2 be not much different, but active regeneration powder
The intensity for the embodiment 3 that Replacement rate is 45% is far below the intensity of reference examples 1.For example, when water-cement ratio is 0.50, curing age is
When 56d, embodiment 1, embodiment 2, the compression strength value of embodiment 3 is the 1.04 of reference examples compression strength value, 0.93 He respectively
0.72 times.
According to 30% substitution of cement quality, and the compression strength value of 28d calculates activity index.It is found that when water-cement ratio is
When 0.40, the activity index of active regeneration powder is about 92%；When water-cement ratio is 0.5, the activity index of active regeneration powder
About 97%.Illustrate under different water-binder ratios, active regeneration powder proposed by the present invention all has higher activity, and activity index reaches
To 90% or more.
By test result in embodiment 7 it is found that active regeneration powder Replacement rate is less than 30% embodiment test specimen resistance to compression
Intensity and same water-cement ratio reference examples test piece intensity difference are little, but regenerated powder Replacement rate reaches 45% embodiment test specimen resistance to compression
Intensity is far below the reference examples test piece intensity with water-cement ratio.Moreover, embodiment test specimen compression strength Later development is tried compared with reference examples
Part intensity is fast, illustrates that active regeneration powder has higher fineness activity, can promote pozzolanic reaction between cement-based material and
Secondary hydration, and then the later strength development for mixing the concrete sample of active regeneration powder is quick.Meanwhile determining embodiment
The compression strength of 4-6, find for " regenerated powder-regenerated coarse aggregate-recycled fine aggregate " system regeneration concrete have with
The similar compression strength value of 1 normal concrete of reference examples.
Concrete crushing strength value (MPa) under 4 different activities regenerated powder Replacement rate of table
Embodiment 8- regeneration concrete flexural strength performances
Fracture resistance is the important indicator for evaluating the flexural members safety of structure such as beams of concrete-plate, to above-described embodiment
The sample obtained in 1-3 and reference examples 1 carries out flexural strength measurement, and concrete outcome is shown in Table 5.As shown in Table 5, different activities are provided
Concrete flexural strength value (curing age 56d) under regenerated powder Replacement rate.By data in table 5 it is found that when water-cement ratio is
0.40, active regeneration powder Replacement rate is 15-30%, and embodiment flexural strength value is not much different with reference examples intensity value, strictly according to the facts
The intensity value for applying example 1 and embodiment 2 is respectively 0.99 and 0.97 times of 1 intensity value of reference examples.When water-cement ratio is 0.50, activity is again
Fecula body Replacement rate is 15-30%, and embodiment flexural strength is higher than reference examples intensity value, and as active regeneration powder replaces
The increase of rate, concrete flexural strength value increases, if the flexural strength value of embodiment 1 and embodiment 2 is respectively 1 intensity of reference examples
1.05 and 1.02 times of value.This is because after mixing active regeneration powder appropriate, active regeneration powder microparticle can fill
Inside concrete hole keeps it more closely knit, and active regeneration powder promotes the pozzolanic reaction and two between cementitious material
Secondary hydration reaction improves the overall performance of concrete.
But when active regeneration powder Replacement rate reaches 45%, embodiment flexural strength value is remote under different water-binder ratios
Less than reference examples intensity value.As water-cement ratio be 0.40 and 0.50 when, the flexural strength value of embodiment 3 is 1 intensity value of reference examples
0.79 and 0.86 time.This is because with the increase of active regeneration powder Replacement rate, cement content is reduced, so inside concrete
Hydrated product is reduced, and when active regeneration powder Replacement rate is higher, concrete performance deterioration is more obvious, and then the anti-folding of intensity is strong
Degree significantly reduces.Meanwhile the flexural strength of embodiment 4-6 is determined, it finds for " regenerated powder-regenerated coarse aggregate-regeneration is thin
The regeneration concrete bulk of aggregate " system has flexural strength value similar with 1 normal concrete of reference examples.
Concrete flexural strength value (MPa) under 5 different activities regenerated powder Replacement rate of table
Embodiment 9- regeneration concrete tensile splitting strength performances
Tensile splitting strength measurement is carried out to the sample obtained in above-described embodiment 1-3 and reference examples 1, concrete outcome is shown in Table
6.As shown in Table 6, it is the tensile splitting strength of concrete 56d under different activities regenerated powder Replacement rate.It can by data in table 6
Know, when water-cement ratio be 0.40 when, active regeneration powder Replacement rate between 15-30%, embodiment test specimen tensile splitting strength with
Reference examples intensity difference is little, if the intensity of embodiment 1 and embodiment 2 is respectively 1.00 and 0.89 times of 1 intensity of reference examples；When
When water-cement ratio is 0.50, active regeneration powder Replacement rate is real with the increase of active regeneration powder Replacement rate between 15-30%
It applies a test specimen splitting-tensile strength to increase compared with reference examples intensity, if the intensity of embodiment 1 and embodiment 2 is respectively reference examples
1.18 and 1.12 times of 1 intensity.
But when active regeneration powder Replacement rate reaches 45%, the embodiment tensile splitting strength value under different water-binder ratios
It is far below reference examples intensity value, such as when water-cement ratio is 0.40 and 0.50, the tensile splitting strength value of embodiment 3 is pair respectively
0.71 and 0.83 time of 1 as usual.Meanwhile the tensile splitting strength of embodiment 4-6 is determined, it finds for " regenerated powder-regeneration
The regeneration concrete bulk of coarse aggregate-recycled fine aggregate " system has Split-tension of Rolled similar with 1 normal concrete of reference examples strong
Degree.
Concrete splitting tensile strength values (MPa) under 6 different activities regenerated powder Replacement rate of table
Measurement based on Compressive Strength of Recycled Concrete, flexural strength and tensile splitting strength in above-mentioned case study on implementation.Knot
Fruit shows that, when active regeneration powder incorporation efficiency is no more than 30%, the incorporation of active regeneration powder influences not concrete strength
Big or slightly raising；But when active regeneration powder incorporation efficiency is more than 45%, concrete strength is substantially reduced, but still meets brick
With the intensity requirement of building block.The Strength Safety of concrete can be ensured by mixing the active regeneration powder of appropriate ratio, while by
Waste concrete and useless common brick in building waste are derived from the raw material for preparing of active regeneration powder, and then promotes active regeneration
The production of concrete has preferable environmental benefit.
Claims (10)
1. a kind of formula of regeneration concrete bulk, in parts by weight, including following components：
2. a kind of formula of regeneration concrete bulk according to claim 1, which is characterized in that the component includes following
Any one of condition is multinomial：
A1) any one of the cement in portland cement or Portland cement；
A2) the active regeneration powder is the fineness powder that building castoff is broken for grain size≤75 μm；
A3) the natural fine aggregate is the natural river sand of grain size 0.15-5mm；
A4) recycled fine aggregate is the construction waste composition granule that building castoff is broken for grain size 0.15-5mm；
A5) natural coarse aggregate is the basaltic broken stone or granite stones of grain size 5-31.5mm；
A6) regenerated coarse aggregate is the construction waste composition granule that building castoff is broken for grain size 5-31.5mm；
A7) water is tap water；
A8) water-reducing agent is polycarboxylate water-reducer.
3. a kind of formula of regeneration concrete bulk according to claim 2, which is characterized in that the building castoff packet
Waste concrete and useless common brick are included, the mass percent that the useless common brick accounts for building castoff is 10-80%.
4. a kind of formula of regeneration concrete bulk according to claim 2, which is characterized in that the active regeneration powder
In, the active regeneration powder of grain size≤45 μm accounts for mass percent >=50% of total active regeneration powder.
5. a kind of formula of regeneration concrete bulk according to claim 4, which is characterized in that when the work of grain size≤45 μm
Property regenerated powder when accounting for active regeneration powder gross mass percentage >=50%, in the formula of regeneration concrete bulk, need additional
Increase and accounts for the water-reducing agent that active regeneration powder gross mass percentage is 0.5%.
6. a kind of production method of regeneration concrete bulk, specifically includes following steps：
1) take each component by formulation ratio, first by formula cement, active regeneration powder, natural fine aggregate, recycled fine aggregate,
Natural coarse aggregate, regenerated coarse aggregate are invested in blender after progress first time stirring, then water and water-reducing agent are invested in stirring
It carries out stirring for second in machine, obtains mixture；
2) by mixture obtained by step 1), poured, be molded after demould, then to get required regeneration coagulation after being conserved
Soil block material.
7. a kind of production method of regeneration concrete bulk according to claim 6, which is characterized in that in step 1), institute
It is to sieve acquisition after building castoff is carried out first break processing to state regenerated coarse aggregate；The recycled fine aggregate is will to regenerate
Coarse aggregate sieves acquisition after carrying out second of break process；The active regeneration powder is ground after drying recycled fine aggregate
Mill, screening obtain.
8. a kind of production method of regeneration concrete bulk according to claim 6, which is characterized in that in step 1), also
Including any one of the following conditions or multinomial：
B1 before) recycled fine aggregate and regenerated coarse aggregate carry out mix, surface saturation plane dry-cure is carried out；
B2) mixing time of the first time stirring is 1-3 minutes；
B3) mixing time >=2 minute of second of stirring；
B4) slump of the mixture is 10-200mm.
9. a kind of production method of regeneration concrete bulk according to claim 6, which is characterized in that in step 2), packet
Include any one of the following conditions or multinomial：
C1) the molding mode is mechanical compression molding；
C2) temperature for pouring scene is not less than 10 DEG C, and relative humidity is not less than 50%；
C3) maintenance is combined selected from one or both of natural curing or wet curing.
10. a kind of regeneration concrete bulk, by the formula or root according to any regeneration concrete bulks of claim 1-5
It is prepared according to the production method of any regeneration concrete bulks of claim 6-9.
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| CN109437692A (en) * | 2018-12-10 | 2019-03-08 | 武汉轻工大学 | Noise abatement insulating wall material and preparation method thereof and noise abatement insulation blocks and preparation method thereof |
| CN110218034A (en) * | 2019-06-20 | 2019-09-10 | 贵州工程应用技术学院 | A kind of method of building waste recovery processing |
| CN110590294A (en) * | 2019-10-29 | 2019-12-20 | 福州大学 | Regenerated powder concrete with good durability and preparation method thereof |
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