CN102390963B - Recycled aggregate medium-dry hard concrete prepared by using building waste and preparation method of recycled aggregate medium-dry hard concrete - Google Patents
Recycled aggregate medium-dry hard concrete prepared by using building waste and preparation method of recycled aggregate medium-dry hard concrete Download PDFInfo
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- CN102390963B CN102390963B CN 201110239638 CN201110239638A CN102390963B CN 102390963 B CN102390963 B CN 102390963B CN 201110239638 CN201110239638 CN 201110239638 CN 201110239638 A CN201110239638 A CN 201110239638A CN 102390963 B CN102390963 B CN 102390963B
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Abstract
The invention discloses a recycled aggregate medium-dry hard concrete prepared by using building waste, which comprises the following raw materials of coarse aggregate, fine aggregate, a gelatinizing agent, a water reducing agent and water, wherein the gelatinizing agent comprises cement and coal ash, and the coarse aggregate comprises 50-100 percent of recycled coarse aggregate prepared from the building waste. A preparation method of the recycled aggregate medium-dry hard concrete comprises the following steps of: pretreating the building waste, removing impurities, remaining waste concrete, waste bricks and the like; crushing and screening to prepare the recycled coarse aggregate; mixing the recycled coarse aggregate, natural sand, cement and water according to the proportion, adding the coal ash and the water reducing agent, stirring uniformly to obtain a mixture; and squeezing and forming the mixture, curing for 2 days to obtain the recycled aggregate medium-dry hard concrete. The invention solves the problems of worsening ecological environment and the like caused by difficulty in treating the building waste; and the building wastes are used for manufacturing the recycled aggregate for replacing natural aggregate, the increasingly deficient natural aggregate and damage degree to the ecological environment are reduced, and the living environment of human beings is protected. The recycled aggregate medium-dry hard concrete prepared by using the method has high strength and high abrasive resistance, and can be used for building base installations such as city roads, housing constructions and the like.
Description
Technical field
The present invention relates to a kind of half lowslump concrete and preparation method thereof, specifically a kind of regeneration aggregate half lowslump concrete and method thereof of utilizing the building castoff preparation.
Background technology
Concrete divides by the workability of mix, has lowslump concrete, half lowslump concrete, plastic concrete, liquid concrete, high-flowing concrete and chutable concrete etc. several.Generally the call ultra-dry stiff concrete of mixing concrete thing consistometric value greater than 30s, to the lowslump concrete that is called between the 30s, consistometric value is less than half lowslump concrete that is called of 20s at 20s for consistometric value.The construction work normal concrete was called the normal concrete mixture before setting and harden not.It must have good denseness is workability, is convenient to the constructing operation such as mix, transportation, pouring, tamping, has the performance that quality is even, moulding is closely knit.After the normal concrete mix setting and harden, should have enough intensity, with the weather resistance of bearing design load and should have that guarantees that buildings can be safe.Workability is comprehensive technological property of normal concrete mix, and it comprises the implication of three aspects such as flowability, glutinous poly-property and full water-based.
Along with the quickening of the Development of Urban process of China's modernization construction, large-scale new town construction and reconstruction of the old city town cause the increasing of building castoff.The waste that building castoff refers to build, produce when repairerment and demolition of buildings has useless tile block, barren rock material, concrete blocks, sand-lime soil usually.Present most of waste concrete all is unprocessed direct stacking or landfill, has not only taken a large amount of soils, contaminate environment, and has caused a large amount of wastes of resource.Because China built in the last few years on a large scale, had expended the material of construction such as a large amount of sand, stone and cement always.The natural resource such as a large amount of exploitation sand, stone cause resource nervous, environmental degradation.People inquire into the waste concrete recycling, mainly are to be prepared as regeneration aggregate or building slab.Because the physicals of waste concrete and natural building material has larger difference, and is larger such as the waste concrete water-intake rate, is generally 3.6～8%, and the water-intake rate of natural aggregate can not guarantee construction quality and work-ing life less than 3% as adopting usual method.
" constructional method of lowslump concrete " patent No. 201010501877.0 of Chinese patent literature report, " a kind of preparation method of hard concrete sample " patent No. 201010501859, all are lowslump concrete constructional methods, half lowslump concrete is not also arranged, particularly the patent report of regeneration aggregate half lowslump concrete constructional method.Half lowslump concrete generally is used in foundation works, and usage quantity is very large.
Summary of the invention
The object of the invention is to for the building castoff resource utilization, be prepared as coarse aggregate with building castoff, prepare half lowslump concrete with this coarse aggregate, a kind of regeneration aggregate half lowslump concrete of building castoff preparation and technical scheme of method thereof utilized is provided.
For achieving the above object, the present invention is achieved by the following technical solutions: regeneration aggregate half lowslump concrete that utilizes the building castoff preparation, it is characterized in that, raw material by following weight parts forms, coarse aggregate 1200～1320, fine aggregate 580～620, jelling agent 320～420, water reducer and water, described jelling agent is cement and flyash, cement accounts for 60～90% of jelling agent, flyash accounts for 10～40% of jelling agent, water reducer is cement amount 0.3～0.5%, water is 150 ± 10, contain 50～100% regenerated coarse aggregates of being made by building castoff in the described coarse aggregate, described fine aggregate is natural matter, the ultimate compression strength of half lowslump concrete is more than or equal to 30Mpa, and its slump value is less than 10mm, and consistometric value is less than 20s.
Described cement is general purpose portland cement strength grade 32.5, and water reducer is commercially available high efficiency water reducing agent.
Utilize the preparation method of regeneration aggregate half lowslump concrete of building castoff preparation, it is characterized in that, concrete steps are as follows:
1) building castoff is carried out pre-treatment, remove foreign material, keep waste concrete, useless brick, waste mortar;
2) to waste concrete, useless brick, waste mortar fragmentation, screening, making particle diameter is regenerated coarse aggregate in the particulate matter of 4.75～31.5mm;
3) according to proportioning regenerated coarse aggregate, natural sand, cement, water are mixed, other adds a small amount of flyash, water reducer, stirs to obtain mixture;
4) above-mentioned mixture is molded through shaking, maintenance in 28 days namely gets regeneration aggregate half lowslump concrete material.
Waste concrete, useless brick, waste mortar account for more than 70% in building castoff, these waste complicateds, and enormous amount is the Focal point and difficult point of processing building castoff.Half lowslump concrete foundation works in construction work is occupied significant proportion, and foundation works adopts half lowslump concrete usually.The present invention for the preparation of the coarse aggregate in half lowslump concrete, because foundation works materials amount is large, can consume a large amount of coarse aggregates with building castoff for the building castoff resource utilization.The coarse aggregate of building castoff preparation is compared with the coarse aggregate of natural materials preparation, has water-absorbent strong, the characteristics that ash is many, regeneration aggregate half lowslump concrete of the present invention is compared with common regenerated aggregate concrete, there is certain difference in intensity and aspect of performance, but the adding because of flyash and water reducer, water consumption and the cement consumption of regeneration aggregate half lowslump concrete are all less, ultimate compression strength and folding strength are higher, shrinkage strain is little, and disconnected plate rate is little, can be used to prepare pavement material, and the brick materials for wall, have highly application value.The present invention can substitute natural coarse aggregate 50～100% with the coarse aggregate of building castoff preparation, makes jelling agent 10-40% with coal ash instead cement.One aspect of the present invention has solved a large amount of building castoff difficult treatment, and by problems such as the ecotope that it causes go from bad to worse; On the other hand; make regeneration aggregate with building castoff and substitute natural aggregate; can reduce construction industry to natural resource consumption; thereby reduce the exploitation to natural sandstone; reduce the day by day deficient and a large amount of sandstones of natural aggregate and exploited the destructiveness that ecotope is caused; protect human living environment, guaranteed the Sustainable development of human society, met the requirement of Sustainable development.Regeneration aggregate half lowslump concrete that the present invention prepares has high strength, high-wearing feature, can be used for the construction of the Infrastructure such as urban road and building construction.
Embodiment
Below in conjunction with embodiment the present invention is done further detailed, complete explanation:
Utilize regeneration aggregate half lowslump concrete of building castoff preparation.According to " design of common concrete proportioning rules " (JGJ55-2000), take the C30 concrete mix as benchmark, with reference to " highway cement concrete pavement construction technique normalizing " (JTG F30-2003), " general purpose portland cement " (GB 175-2007) and " flyash concrete utilisation technology standard " (GBJ 146-90).
1, raw material
Raw material by following weight forms, coarse aggregate 1200～1320, fine aggregate 580～620, jelling agent 320～420, water reducer and water, described jelling agent is cement and flyash, cement account for jelling agent 60～90%, flyash accounts for 10～40% of jelling agent, water reducer is cement amount 0.3～0.5%, and water is 150 ± 10.The concrete raw material of each embodiment sees Table 1.Contain 50～100% regenerated coarse aggregates of being made by building castoff in the described coarse aggregate, described fine aggregate is natural matter, and the ultimate compression strength of half lowslump concrete is more than or equal to 30
Mpa, its slump value is less than 10mm, and consistometric value is less than 20s.Regeneration aggregate half lowslump concrete proportioning is calculated by " design of common concrete proportioning rules ", about 1 cube of concrete.
Wherein:
(1) coarse aggregate is, the building castoff of reconstruction of village-in-city grades technique and the regenerated coarse aggregate of particle diameter in 4.75mm～31.5mm scope that obtain through artificial separation, jaw crushing, vibratory screening apparatus, and major ingredient is waste concrete, useless brick, waste mortar.The regenerated coarse aggregate grating is, particle diameter 4.75 mm～9.5 mm account for 22%, and particle diameter 9.5mm～19.0mm accounts for 53%, and particle diameter 19.0mm～31.5 mm account for 25%.Natural aggregate is cobble, rubble.Grating such as the table 1 of coarse aggregate,
(2) the natural fine aggregate is common building with river sand, mountain sand or stone flour, maximum particle diameter 4.75mm, and continuous grading, it is 2.500,1.250,0.630,0.315 and the summation of the sieve accumulated retained percentage in five kinds of apertures such as 0.160mm.
(3) cement is Portland blastfurnaceslag cement, strength grade 32.5,28 days ultimate compression strength of cement is 32.5 Mpa, cement is as concrete gelling material, the solidifying slurry of cement plays conclusive effect to concrete quality, and its Main Function is: the hole that is wrapped in aggregate surface and filler aggregate; Be lubricant lubricate between gathering materials at concrete coagulation sclerosis previous crops, make the mixing concrete thing have the workability that is suitable for constructing; When concrete coagulation hardens, strengthen the cohesive force between the aggregate, make mixed mirror soil reach needed intensity, weather resistance etc.
(4) flyash is the ash discharge of the Yang Zonghai of Yunnan Province power plant dry.Flyash mixes in the concrete in right amount, can partly replace cement, can not only save cement consumption, reduce Cost of Concrete, and can also improve the workability of mixing concrete thing, because flyash has activation, the hydration reaction of regeneration aggregate surface residual cement mortar can be strengthened, the performances such as concrete density, impermeability and chemical resistance can also be improved.
(5) water reducer is, the good growing concrete admixture in Kunming is sold the sky skill board FDN-2 high efficiency water reducing agent that limited liability company sells, and major ingredient is: the high condenses of β-naphthalenesulfonateformaldehyde formaldehyde.Water reducer can be saved mixing water content, increases concrete flowability, improves concrete workability, the reduction of erection time, accelerate works progress, and also can save the engineered cementitious consumption, have good economic benefit.Simultaneously can also strengthen concrete intensity.
2, preparation method:
(1) regenerated coarse aggregate, fine aggregate, cement, water are mixed, other adds a small amount of flyash, water reducer, stirs, and wherein: water-cement ratio is 0.3～0.5, the water reducer volume is cement amount 0.3～0.5%.
(2) adopt the molded technique of shaking, frequency is 2860 minutes/time, and amplitude is 0.5mm, and upper surface pressure is 0.6Mpa, and time of vibration is under the condition of 15s, carries out maintenance, namely can obtain regeneration aggregate half lowslump concrete.
(3) check: before maintenance, detect the slump, denseness.Prepared 28 days compression strength value 39.54Mpa of regeneration aggregate half lowslump concrete, its slump value 8mm, consistometric value 14s.
3, purposes
Utilize regeneration aggregate half lowslump concrete of building castoff preparation to can be used to prepare ultimate compression strength at regenerated aggregate concrete pavement material and the regenerated aggregate concrete brick of C30 and following requirement of strength.
Table 1
Table 2
Claims (1)
1. utilize regeneration aggregate half lowslump concrete of building castoff preparation, it is characterized in that, raw material by following weight parts forms, coarse aggregate 1200～1320, fine aggregate 580～620, jelling agent 320～420, water reducer and water, described jelling agent is cement and flyash, cement accounts for 60～90% of jelling agent, flyash accounts for 10～40% of jelling agent, water reducer is cement amount 0.3～0.5%, water is 150 ± 10, contain 50～100% regenerated coarse aggregates of being made by building castoff in the described coarse aggregate, described building castoff is concrete, useless brick, waste mortar, described fine aggregate is natural matter, the ultimate compression strength of half lowslump concrete is more than or equal to 30MPa, and its slump value is less than 10mm, and consistometric value is less than 20s.
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| CN 201110239638 CN102390963B (en) | 2011-08-19 | 2011-08-19 | Recycled aggregate medium-dry hard concrete prepared by using building waste and preparation method of recycled aggregate medium-dry hard concrete |
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| CN1562858A (en) * | 2004-03-25 | 2005-01-12 | 同济大学 | Mix material of zoology concrete in use for bearing structure and preparation method |
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