CN105367004A - C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method - Google Patents
C30 durable recycled shaping aggregate concrete prepared from construction wastes and preparation method Download PDFInfo
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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
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Abstract
The present invention belongs to the technical field of concrete used for a construction material and provides a C30 durable recycled shaping aggregate concrete prepared from construction wastes and a preparation method so as to solve the problems that construction wastes are difficult to recycle in China, the utilization rate of the concrete aggregates in the construction wastes is low, and the durability of the recycled aggregates is poor. The concrete is prepared by mixing cement, fly ash, ore powder, fine aggregates, coarse aggregates, an admixture and water according to a specific proportion, wherein the fine aggregates are a mixture of sand and recycled shaping fine aggregates, the weight of the recycled shaping fine aggregates accounts for 20-100% of the total weight of the fine aggregates, the coarse aggregates are a mixture of gravel and recycled shaping coarse aggregates, and the weight of the recycled shaping coarse aggregates accounts for 20-100% of the total weight of the coarse aggregates. Construction wastes are broken and particles are shaped to obtain the recycled shaping aggregates. On the premise that concrete blending proportion is not changed, natural aggregates are replaced into the recycled shaping aggregates, production costs are reduced, and a great economic benefit is generated. Energy is conserved, a demand for the natural aggregates is effectively reduced, and resources are effectively protected and conserved, thereby realizing environmental friendly construction.
Description
Technical field
The invention belongs to material of construction technical field of concrete, be specifically related to C30 weather resistance regeneration shaping aggregate concrete prepared by a kind of building waste and preparation method.
Background technology
Along with expanding economy, the scale in city is also in continuous expansion, and increasing suburb rural is included into city and becomes villages within the city.Apart from statistical calculation, between 2003-2012 10 years, about 4,660,000 square metres of area is removed by villages within the city of Taiyuan City.Taiyuan City in 2013 has 50 villages within the city and starts to remove, and by November, 2013, accumulative removal 458.19 ten thousand square metres, removes and create a large amount of building wastes.Building waste had both polluted that environment is a large amount of again takies limited soil, and the process of building waste is also a huge engineering, concrete is as the maximum material of construction of usage quantity, very large to the demand of resource, coarse aggregate as concrete raw material exploits massif, havoc ecotope in a large number due to needs.The area that fine aggregate output before some is larger has been exhausted trend now, and on market, natural fine aggregate quality significantly declines.
Along with the reinforcement of environmental consciousness, how everybody effectively can utilize this resource of building waste in consideration, large batch of discarded concrete not only can have been preserved the ecological environment but also reduced the waste of resource as regeneration aggregate.Many wastes in building castoff through torpedo, rejecting and pulverizing, and can re-use as renewable resource mostly through specific installation process.
Summary of the invention
The present invention is difficult to recycling to solve China's building waste, and aggregate utilization ratio in building castoff is low, the problem of regeneration aggregate poor durability, provides C30 weather resistance regeneration shaping aggregate concrete and preparation method prepared by a kind of building waste.
The present invention is realized by following technical scheme: C30 weather resistance regeneration shaping aggregate concrete prepared by a kind of building waste, be made up of the raw material of following weight part: cement 280 parts, 50 parts, flyash, breeze 80 parts, fine aggregate 800 parts, coarse aggregate 1020 parts, admixture 11.5 parts, 180 parts, water, described fine aggregate is that sand mixes with regeneration shaping fine aggregate, wherein regenerate the 20%-100% that shaping fine aggregate accounts for fine aggregate gross weight, described coarse aggregate is that rubble mixes with regeneration shaping coarse aggregate, wherein regenerates the 20-100% that shaping coarse aggregate accounts for coarse aggregate gross weight.
Preferred: described regeneration shaping fine aggregate accounts for 100% of fine aggregate gross weight, and described regeneration shaping coarse aggregate accounts for 100% of coarse aggregate gross weight.
The fineness modulus of described regeneration shaping fine aggregate is 2.9%, and apparent density is 2480kg/m
3, tap density is 1390kg/m
3, powder content is 3%, and clod content is 0.8%, the reclaimed sand of regeneration ratio of water dosage 1.15, and reclaimed rubber sand strength ratio is 1.00; Described regeneration shaping coarse aggregate is 5-20mm continuous size fraction rubble, and apparent density is 2660kg/m
3, tap density is 1470kg/m
3, silt content is 0.5%, and crush index is 7.4%; Described cement is P.O42.5 cement, and described flyash is I grade of flyash, and described breeze is S95 breeze, and described sand is washed-out sand, and described rubble is 5-20mm continuous size fraction rubble, and described admixture is efficient naphthalene water reducer.
The preparation method of described regeneration shaping coarse aggregate and regeneration shaping fine aggregate is: first screen building waste, reject the large-scale impurity such as reinforcing bar, timber; The waste concrete refuse breaking selected is become to the bulk of 60mm, then pour shredder into and be processed into aggregate, obtain the original aggregate that particle diameter is 30-35mm, use 5mm screening plant, filter out original coarse aggregate and primary fine aggregate; The original coarse aggregate of screening is continued to grind to form the regenerated coarse aggregate that particle diameter is 5-20mm, the primary fine aggregate that particle diameter is less than 5mm is poured fine aggregate shredder into and is ground to form the recycled fine aggregate that fineness modulus is 2.9%, regenerated coarse aggregate and recycled fine aggregate water rinse, separating impurity, then dry acquisition regenerates shaping coarse aggregate and regeneration shaping fine aggregate.
The present invention uses cement to be the P.O42.5 cement that two good Cement Co., Ltd of making innovations produces, and admixture is fly in circles the efficient naphthalene water reducer that building material company limited produces in Shanxi.
Comparatively natural aggregate is thick for the grating of conventional regeneration aggregate; The outward appearance of regeneration aggregate is slightly flat, and simultaneously with some corner angle, profile is between rubble and cobble, and this profile will reduce the workability newly mixing regeneration concrete; The surface of regeneration aggregate is comparatively coarse, and space is more, the surface then relative smooth of natural aggregate, and naked eyes can see that sand-cement slurry more or less is mostly adhered on regeneration aggregate surface; The tap density of regeneration aggregate and apparent density comparatively natural aggregate are slightly lower; The 24h water-intake rate of regeneration aggregate is apparently higher than natural aggregate, and its porosity is large.Regeneration aggregate surface irregularity, porosity are high, and water-intake rate have impact on greatly and obviously the workability of fresh concrete.
The present invention analyzes and sums up domestic regenerated aggregate concrete weather resistance utilisation technology, and propose regenerated aggregate concrete weather resistance improving environment, scientific guidance China regeneration aggregate engineer applied, improves existing regenerated aggregate concrete application standard system.The use of regenerated aggregate concrete is made to enter practical stage.Realize goods and materials recycle in concrete production process and ensure the Sustainable development of building industry, effectively utilize this technology to solve the resource problem become increasingly conspicuous, there is social benefit and environmental benefit significantly.
The present invention has following characteristics by the regeneration shaping aggregate after particle shaping: 1, outward appearance is rounder and more smooth, similar to natural aggregate outward appearance; 2, the sand-cement slurry of surface attachment is removed; 3, the porosity of regeneration aggregate is reduced.Because shaping regeneration aggregate has above feature, so the serviceability of the regeneration concrete of shaping regeneration aggregate preparation is identical with normal concrete.Its compressive strength of concrete made all can reach the ultimate compression strength of normal concrete, and water resistant penetrating power is then suitable with normal concrete water resistant penetrating power.Concrete cube mass loss rate prepared by study on frost-resistance display regeneration shaping aggregate and relative dynamic elastic modulus can be suitable with relative dynamic elastic modulus with the mass loss rate of normal concrete, the anti-carbonation depth of concrete cube prepared by regeneration shaping aggregate differs very little with normal concrete, therefore use regeneration shaping aggregate not affect significantly the anti-carbonation properties in its chronicity and endurance quality in concrete.Regeneration shaping aggregate concrete is added by mix-proportion adjustment and admixture, anti-chlorine penetrating quality increases, not than the difference of normal concrete, and in early days resistance to cleavage is also better than normal concrete, after adopting saturation ratio to be respectively the regeneration shaping aggregate of the semi-saturation surface dry condition of 89.5% and 88.1%, the freeze-thaw resistance of regeneration concrete significantly improves.
The present invention is used among engineering, can reach the weather resistance of normal concrete, can economize on resources, the energy, not welding, is conducive to environment, meets the strategic requirement of Sustainable development.In actual production, the discarded concrete produced, buildings can be broken into regeneration aggregate, obtain shaping regeneration aggregate by particle shaping in production.Under the prerequisite that concrete mix is constant, natural aggregate is all replaced to shaping regeneration aggregate, can production cost be reduced, produce great economic benefit.Adopt regenerated aggregate concrete weather resistance control techniques save energy, effectively reduce the demand to natural aggregate, available protecting and saved resource, realize green, environmental protection.Achieve green construction, avoid the waste to resource, win consistent favorable comment socially.
Accompanying drawing explanation
Fig. 1 is embodiment 5 and normal concrete carbonation depth influence curve figure, and X-coordinate is 28d concrete carbonization depth (mm), and ordinate zou is water-cement ratio; Fig. 2 be cement consumption to carbonation depth influence curve figure, X-coordinate is 28d concrete carbonization depth (mm), and ordinate zou is cement consumption (kg).
Embodiment
Embodiment 1: C30 weather resistance regeneration shaping aggregate concrete prepared by a kind of building waste, be made up of the raw material of following weight: cement 280kg, flyash 50kg, breeze 80kg, fine aggregate 800kg, coarse aggregate 1020kg, admixture 11.5kg, water 180kg, described fine aggregate is that sand mixes with regeneration shaping fine aggregate, wherein regenerate shaping fine aggregate and account for 20% of fine aggregate gross weight, described coarse aggregate is that rubble mixes with regeneration shaping coarse aggregate, wherein regenerates shaping coarse aggregate and accounts for 20% of coarse aggregate gross weight.
The fineness modulus of described regeneration shaping fine aggregate is 2.9%, and apparent density is 2480kg/m
3, tap density is 1390kg/m
3, powder content is 3%, and clod content is 0.8%, the reclaimed sand of regeneration ratio of water dosage 1.15, and reclaimed rubber sand strength ratio is 1.00; Described regeneration shaping coarse aggregate is 5-20mm continuous size fraction rubble, and apparent density is 2660kg/m
3, tap density is 1470kg/m
3, silt content is 0.5%, and crush index is 7.4%; Described cement is P.O42.5 cement, and described flyash is I grade of flyash, and described breeze is S95 breeze, and described sand is washed-out sand, and described rubble is 5-20mm continuous size fraction rubble, and described admixture is efficient naphthalene water reducer.
The preparation method of described regeneration shaping coarse aggregate and regeneration shaping fine aggregate is: first screen building waste, reject the large-scale impurity such as reinforcing bar, timber; The waste concrete refuse breaking selected is become to the bulk of 60mm, then pour shredder into and be processed into aggregate, obtain the original aggregate that particle diameter is 30-35mm, use 5mm screening plant, filter out original coarse aggregate and primary fine aggregate; The original coarse aggregate of screening is continued to grind to form the regenerated coarse aggregate that particle diameter is 5-20mm, the primary fine aggregate that particle diameter is less than 5mm is poured fine aggregate shredder into and is ground to form the recycled fine aggregate that fineness modulus is 2.9%, regenerated coarse aggregate and recycled fine aggregate water rinse, separating impurity, then dry acquisition regenerates shaping coarse aggregate and regeneration shaping fine aggregate.
Embodiment 2: C30 weather resistance regeneration shaping aggregate concrete prepared by a kind of building waste, be made up of the raw material of following weight: cement 280kg, flyash 50kg, breeze 80kg, fine aggregate 800kg, coarse aggregate 1020kg, admixture 11.5kg, water 180kg, described fine aggregate is that sand mixes with regeneration shaping fine aggregate, wherein regenerate shaping fine aggregate and account for 40% of fine aggregate gross weight, described coarse aggregate is that rubble mixes with regeneration shaping coarse aggregate, wherein regenerates shaping coarse aggregate and accounts for 40% of coarse aggregate gross weight.All the other methods are with method described in embodiment 1.
Embodiment 3: C30 weather resistance regeneration shaping aggregate concrete prepared by a kind of building waste, be made up of the raw material of following weight: cement 280kg, flyash 50kg, breeze 80kg, fine aggregate 800kg, coarse aggregate 1020kg, admixture 11.5kg, water 180kg, described fine aggregate is that sand mixes with regeneration shaping fine aggregate, wherein regenerate shaping fine aggregate and account for 60% of fine aggregate gross weight, described coarse aggregate is that rubble mixes with regeneration shaping coarse aggregate, wherein regenerates shaping coarse aggregate and accounts for 60% of coarse aggregate gross weight.All the other methods are with method described in embodiment 1.
Embodiment 4: C30 weather resistance regeneration shaping aggregate concrete prepared by a kind of building waste, be made up of the raw material of following weight: cement 280kg, flyash 50kg, breeze 80kg, fine aggregate 800kg, coarse aggregate 1020kg, admixture 11.5kg, water 180kg, described fine aggregate is that sand mixes with regeneration shaping fine aggregate, wherein regenerate shaping fine aggregate and account for 80% of fine aggregate gross weight, described coarse aggregate is that rubble mixes with regeneration shaping coarse aggregate, wherein regenerates shaping coarse aggregate and accounts for 80% of coarse aggregate gross weight.All the other methods are with method described in embodiment 1.
Embodiment 5: C30 weather resistance regeneration shaping aggregate concrete prepared by a kind of building waste, be made up of the raw material of following weight: cement 280kg, flyash 50kg, breeze 80kg, fine aggregate 800kg, coarse aggregate 1020kg, admixture 11.5kg, water 180kg, described fine aggregate is regeneration shaping fine aggregate, and described coarse aggregate is regeneration shaping coarse aggregate.All the other methods are with method described in embodiment 1.
After being marched into the arena by starting material, make concrete test block in proportion, adopt axle horizontal type forced stirrer to stir, various material is poured in stirrer in order, Keep agitation 2min, goes out hand mixing 1min after machine.The concrete serviceability of Observe and measure, 100mm × 100mm × 100mm the test cube in indwelling 3d, 7d, 28d length of time, 100mm × 100mm × 400mm prism freeze-thaw-test specimen, the Rotary-table impervious test piece of 175mm × 185mm × 150mm, carries out simultaneous test.
Experimental example 1: concrete work performance test verification: after concrete mix goes out machine, uses the slump of orifice tube test mixture, and the divergence of record concrete mix, observes the serviceability of concrete mix.Detailed results is in table 1.
Table 1: concrete work performance detected result
Can be drawn the following conclusions by table 1: the serviceability of the regeneration concrete of the regeneration shaping aggregate preparation obtained through particle shaping is identical with normal concrete serviceability.Owing to having following characteristics by the regeneration aggregate after particle shaping: 1, outward appearance is rounder and more smooth, similar to natural aggregate outward appearance; 2, the sand-cement slurry of surface attachment is removed; 3, the porosity of regeneration aggregate is reduced.Because shaping regeneration aggregate has above feature, so the serviceability of the regeneration concrete of regeneration shaping aggregate preparation is identical with normal concrete.
Experimental example 2: concrete crushing strength is checked: the ultimate compression strength test block of indwelling is leave standstill diel in the environment of 20 ± 5 DEG C in temperature, numbering, putting into temperature after form removal is immediately 20 ± 2 DEG C, relative humidity is maintenance in the standard curing room of more than 95%, and the length of time of normal curing is 28d(timing from stirring adds water).Reach after test specimen takes out from maintenance place by curing age and carry out compression tests.During strength grade of concrete < C30, loading speed gets 0.3-0.5MPa/m; Strength grade of concrete >=C30 and < C60 time, loading speed gets 0.5-0.8MPa/m.Test-results is in table 2, and the compressive strength of concrete that result display regeneration shaping aggregate is made all can reach the ultimate compression strength of normal concrete.
Table 2: concrete crushing strength test-results
Experimental example 3: agent on crack resistance of concrete water permeation performance: the day before yesterday reaching the test length of time at the impervious test piece of indwelling, takes out test specimen from curing room, and wiped clean, after surface of test piece is dried, test specimen is sealed.After test specimen is ready to, starts Anti-leakage instrument, and open the valve under 6 test specimens, water is oozed out from 6 holes, water should be full of hole, examination position, the test specimen of good seal should be arranged on Anti-leakage instrument after the valve under closedown 6 examination position.After test specimen installs, open the valve under 6 examination positions immediately, hydraulic pressure from 0.1Mpa, should increase 0.1Mpa hydraulic pressure every 8h later, and should observe test specimen end face infiltration situation at any time.When there being 3 surface of test piece to occur infiltration in 6 test specimens, or when adding to specified pressure (design seepage-resistant grade) in 6 test specimens, surface infiltration test specimen is less than 3 in 8h, test can being stopped, and write down water pressure now.In process of the test, when finding that water oozes out from test specimen periphery, sealing should be re-started by standard regulation.Examination is joined concrete impermeability and be the results are shown in Table 3, and the water resistant penetrating power of result display regeneration shaping aggregate concrete is suitable with normal concrete water resistant penetrating power.
Table 3: impermeability detected result
Experimental example 4: concrete antifreezing performance: the freeze-thaw-test specimen of indwelling when curing age reaches 28d in water, takes out test specimen, measures, and number with wet cloth after wiping surface-moisture to apparent size, weighing test specimen initial mass; Then the initial value of the horizontal fundamental frequency of test specimen is measured.Test specimen is put into test specimen box, test specimen should be positioned at test specimen box center, then test specimen box is put into the test-piece stand of freeze thawing case, and to injected clear water in test specimen box.In whole process of the test, in box, elevation of water surface should remain and at least exceed test specimen end face 5mm.The horizontal fundamental frequency of test specimen should be measured every 25 freeze-thaw cycle, should first surface of test piece scum silica frost be cleaned up and dry surface-moisture before measurement, then detector outer damage weigh the quality of test specimen, measure the horizontal fundamental frequency of test specimen subsequently.After having surveyed, should test specimen to be turned around to reload rapidly in test specimen box and to add clear water, continuing test.The measurement of test specimen, weighing and visual inspection should be rapid, and the wet cloth of test specimen application to be measured covers.When freeze-thaw cycle occurs that following situations for the moment, can stop test: the freezing-thawing cycles reaching regulation; The relative dynamic elastic modulus of test specimen drops to 60%; The mass loss rate of test specimen reaches 5%.After 150 freeze-thaw cycle are carried out to the agent on crack resistance of concrete freeze thawing test specimen of indwelling, examination is joined concrete anti-freezing property and be the results are shown in Table 4, and result shows: the regeneration concrete mass loss rate of shaping and relative dynamic elastic modulus can be suitable with relative dynamic elastic modulus with the mass loss rate of normal concrete.
Table 4: anti-freezing property freezes test-results
Experimental example 5: agent on crack resistance of concrete carbonation properties: the CO in air
2constantly to inside concrete diffusion, cause the pH value of concrete hole solution to reduce, this phenomenon is called carbonization.As concrete pH<10, the passive film of reinforcing bar is destroyed, and reinforcing bar generation corrosion, volumetric expansion 2.5 times, concrete cracking, reduce with the cohesive force of reinforcing bar, concrete cover peels off, and area of reinforement defect, has a strong impact on weather resistance.This experimental study carbonization speed of regeneration concrete, and to contrast with the normal concrete of identical proportioning.Test conditions is temperature 20 DEG C, relative humidity 60%, and the concentration of carbonic acid gas is 20%, and regeneration aggregate is processed by carbonated concrete.Agent on crack resistance of concrete carbonation properties proportioning selects proportioning described in embodiment 5 to carry out, in addition based on embodiment 5 proportioning, water-cement ratio is constant, changes cement consumption, the substitution rate of regeneration shaping aggregate is 100% to test, and analyzes the difference of cement consumption to the impact of agent on crack resistance of concrete carbonation properties.
Concrete carbonization sample dimensions is 100mm × 100mm × 100mm.Form removal after the concrete 24h prepared, puts into the indoor maintenance 28d of normal curing afterwards by test specimen.Carbonization test specify to carry out in test basis GB50082-2009 " normal concrete long-term behaviour and endurance quality test method standard ", carries out the measurement of carbonation depth when to test the length of time be 3d, 7d, 28d.Its carbonation properties data in table 5, table 6, analytic curve Fig. 1, Fig. 2.Result shows: water-cement ratio is similar with the impact of regeneration shaping aggregate on normal concrete, and carbonation depth is all along with the change of water-cement ratio is large and elongated.This is because water-cement ratio increases, concrete degree of compactness is deteriorated, CO
2velocity of diffusion is accelerated, and carbonation depth increases.
When water-cement ratio is certain, change cement consumption, concrete carbonation depth also changes thereupon.When cement consumption increases, concrete carbonation depth reduces.This is because water-cement ratio is constant, cement consumption becomes large, and concrete is more closely knit, makes CO
2velocity of diffusion reduces, and carbonation depth reduces.The concrete anti-carbonation depth of regeneration shaping aggregate differs very little with normal concrete, therefore use regeneration shaping aggregate not affect significantly the anti-carbonation properties in its chronicity and endurance quality in concrete.
Table 5: the concrete carbonizing performance data prepared by embodiment 5
Table 6: different cement addition is to the experimental data of concrete carbonizing performance
Experimental example 6: Sulfate Resistance of Concrete energy: concrete hydrating effect product, as C3AH, Ca (OH)
2after reacting with C-S-H gel and vitriol, will swelling salt be generated, thus cause and expand and cause crack of surface layer or softening.Crack has encouraged again containing the infiltration of vitriol with the eroding water of other ions, accelerates concrete destruction further, and has influence on the adhesive property of cement-hydrate, finally have influence on intensity.About the research of regeneration concrete sulphate-corrosion resistance, test employing test block is the prism of 100mm × 100mm × 500mm.Sulfate liquor comprises two kinds, and one is Na
2sO
4and MgSO
4solution, its concentration is 7.5%; Another is the H of pH=2
2sO
4solution.Test-results shows, the sulphate-corrosion resistance of regeneration shaping aggregate concrete is substantially identical with normal concrete.
Ion penetration resistance of concrete energy and concrete early anti-cracking behavior can study display, regeneration shaping aggregate concrete is added by mix-proportion adjustment and admixture, anti-chlorine penetrating quality is higher than normal concrete Anti-Chloride Ion Penetration, and regeneration shaping aggregate concrete is also better than normal concrete in splitting resistance aspect in early days.
Claims (4)
1. the C30 weather resistance regeneration shaping aggregate concrete prepared with building waste, it is characterized in that: be made up of the raw material of following weight part: cement 280 parts, 50 parts, flyash, breeze 80 parts, fine aggregate 800 parts, coarse aggregate 1020 parts, admixture 11.5 parts, 180 parts, water, described fine aggregate is that sand mixes with regeneration shaping fine aggregate, wherein regenerate the 20%-100% that shaping fine aggregate accounts for fine aggregate gross weight, described coarse aggregate is that rubble mixes with regeneration shaping coarse aggregate, wherein regenerates the 20-100% that shaping coarse aggregate accounts for coarse aggregate gross weight.
2. the C30 weather resistance that prepared by a kind of building waste according to claim 1 regenerates shaping aggregate concrete, it is characterized in that: described regeneration shaping fine aggregate accounts for 100% of fine aggregate gross weight, and described regeneration shaping coarse aggregate accounts for 100% of coarse aggregate gross weight.
3. the C30 weather resistance that prepared by a kind of building waste according to claim 1 regenerates shaping aggregate concrete, it is characterized in that: the fineness modulus of described regeneration shaping fine aggregate is 2.9%, and apparent density is 2480kg/m
3, tap density is 1390kg/m
3, powder content is 3%, and clod content is 0.8%, the reclaimed sand of regeneration ratio of water dosage 1.15, and reclaimed rubber sand strength ratio is 1.00; Described regeneration shaping coarse aggregate is 5-20mm continuous size fraction rubble, and apparent density is 2660kg/m
3, tap density is 1470kg/m
3, silt content is 0.5%, and crush index is 7.4%; Described cement is P.O42.5 cement, and described flyash is I grade of flyash, and described breeze is S95 breeze, and described sand is washed-out sand, and described rubble is 5-20mm continuous size fraction rubble, and described admixture is efficient naphthalene water reducer.
4. the C30 weather resistance that prepared by a kind of building waste according to claim 1 regenerates shaping aggregate concrete, it is characterized in that: the preparation method of described regeneration shaping coarse aggregate and regeneration shaping fine aggregate is: first screen building waste, reject the large-scale impurity such as reinforcing bar, timber; The waste concrete refuse breaking selected is become to the bulk of 60mm, then pour shredder into and be processed into aggregate, obtain the original aggregate that particle diameter is 30-35mm, use 5mm screening plant, filter out original coarse aggregate and primary fine aggregate; The original coarse aggregate of screening is continued to grind to form the regenerated coarse aggregate that particle diameter is 5-20mm, the primary fine aggregate that particle diameter is less than 5mm is poured fine aggregate shredder into and is ground to form the recycled fine aggregate that fineness modulus is 2.9%, regenerated coarse aggregate and recycled fine aggregate water rinse, separating impurity, then dry acquisition regenerates shaping coarse aggregate and regeneration shaping fine aggregate.
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