阅读说明：本技术 干拌复合轻集料混凝土及其应用 (Dry mixing combined lightweight aggregate concrete and its application ) 是由 秦远 陈龙 王九飙 庄培 朱鹏 夏吉勇 于 2019-09-29 设计创作，主要内容包括：本发明提供了一种干拌复合轻集料混凝土及其制备方法。本发明提供的干拌复合轻集料混凝土包括水泥、活性再生微粉、组分A再生细骨料、干沙、聚氨酯颗粒、外加剂和水,所述组分A选自粉煤灰和矿粉中的一种或两种。本发明提供的干拌复合轻集料混凝土能够提升建筑垃圾资源利用效率,降低轻集料混凝土水泥用量,提升材料体系堆积密度,促进轻集料混凝土强度,并且有助于减少建筑业对天然集料的消耗,缓解生态环境的破坏。(The present invention provides a kind of dry mixing combined lightweight aggregate concretes and preparation method thereof.Dry mixing combined lightweight aggregate concrete provided by the invention includes that cement, active regeneration micro mist, component A recycled fine aggregate, dry sand, polyurethane particles, additive and water, the component A are selected from one or both of flyash and miberal powder.Dry mixing combined lightweight aggregate concrete provided by the invention is able to ascend the building waste level of resources utilization, reduce light aggregate concrete cement consumption, promote material system bulk density, promote light aggregate concrete intensity, and helps to reduce consumption of the construction industry to natural aggregate, alleviate the destruction of ecological environment.)

1. a kind of dry mixing combined lightweight aggregate concrete, including it is cement, active regeneration micro mist, component A recycled fine aggregate, dry husky, poly- Urethane particle, additive and water, the component A are selected from one or both of flyash and miberal powder.

2. concrete according to claim 1, which is characterized in that the concrete includes cement 130-450 parts by weight, work Property regenerative micro powder 15-95 parts by weight, the component A 12-55 parts by weight, recycled fine aggregate 10-75 parts by weight, dry sand 10-180 Parts by weight, polyurethane particles 30-100 parts by weight, additive 6-26 parts by weight and water 80-350 parts by weight, it is preferable that the work Property regenerative micro powder and the component A weight ratio be 0.5-10:1, preferably 0.5-2:1.

3. concrete according to claim 1 or 2, which is characterized in that the additive includes cellulose, rubber powder, powder Waterproofing agent, water-reducing agent and early strength agent, it is preferable that the additive include cellulose 1-3 parts by weight, rubber powder 1.5-5.5 parts by weight, Powder waterproofing agent 1.5-6 parts by weight, water-reducing agent 1.5-7.5 parts by weight and early strength agent 0.5-4 parts by weight.

4. concrete according to any one of claim 1-3, which is characterized in that the polyurethane particles include first poly- Urethane particle and the second polyurethane particles, wherein the partial size of the first polyurethane particles and the second polyurethane particles is different, it is preferable that The partial size of first polyurethane particles is 2-5mm, and the partial size of second polyurethane particles is 6-19mm.

5. concrete described in any one of -4 according to claim 1, which is characterized in that the concrete includes the first polyurethane Particle 10-45 parts by weight, the second polyurethane particles 10-55 parts by weight.

6. concrete according to any one of claims 1-5, which is characterized in that the grade of the recycled fine aggregate is 0.15-5mm。

7. concrete according to claim 1 to 6, which is characterized in that the partial size of the active regeneration micro mist exists 10 μm hereinafter, and/or the active regeneration micro mist specific surface area be greater than 1000m²/ kg, activity index are greater than 95%.

8. a kind of preparation method of concrete described in any one of -7 according to claim 1, comprising:

Step A: building waste is obtained into regenerative micro powder and recycled fine aggregate after processing；

Step B: regenerative micro powder physical excitation is obtained into active regeneration micro mist；

Step C: cement, active regeneration micro mist, component A, dry husky, recycled fine aggregate and additive are mixed, mixture is obtained；

Step D: the resulting mixture of step C is mixed with polyurethane particles, obtains dry mixing composite light aggregate；

Step E: the resulting dry mixing composite light aggregate of step D is mixed with water, obtains the dry mixing combined lightweight aggregate concrete.

9. preparation method according to claim 8, which is characterized in that in step A, the processing includes sorting, is sieved, and is broken Broken and grinding；And/or in step B, the step of physical excitation includes that the fine powder by partial size less than 0.15mm carries out grinding, excellent After powder mill 0.5 hour, then carrying out superfine grinding to fine powder partial size is 10 μm or less.

10. a kind of concrete described in any one of -7 or preparation side according to claim 8 or claim 9 according to claim 1 Application of the concrete that method obtains in building trade.

Technical field

The invention belongs to the field of building materials, and in particular to a kind of dry mixing composite light aggregate based on construction refuse resource Concrete and preparation method thereof.

Background technique

The resource utilization of building castoff is a hot spot at present in the world, and especially at home, even more practice follows One of the key areas of ring economic and energy saving emission reduction.About 1,000,000,000 tons of the building waste that China generates every year at present, and its utilization rate But less than 5%, a large amount of building waste destroys soil without the simple landfill of disposition, occupancy arable land, pollutes atmosphere and water source, Bring serious carrying capacity of environment.

Building waste has the attribute of recycling, and traditional land-fill method largely wastes the potential valence of material Value.Currently, disposition and utilization for building castoff, there have been many research and application practice in the country, and majority concentrates on Utilize discarded concrete production regenerated aggregate concrete and the various bricks of production etc..

In the building castoff that the country generates, the brick mixed building waste of material based on clay brick and a small amount of concrete Occupy major part.But the utilization about brick mixed building waste, domestic corresponding research and practice and few.It will building Waste is levigate to be made regenerative micro powder, application technology of this micro mist as mineral admixture in concrete is studied, for big Scale resource utilization building castoff is of great significance, it will has broad application prospects and huge economic benefit.

In view of the reproducibility and resource of the material of building waste, develops new available approach, improves building rubbish The utilization rate of rubbish, the more efficient propulsion building waste of energy extend from " building materials-building-rubbish-building materials " substance closed cycle Building waste Life cycle value chain all has preferably to the environmentally friendly, resource-conserving of creation and without abolished city city It influences.

Patent " a kind of dry mixing combined lightweight aggregate concrete and preparation method thereof application number CN104909632A Cheng Jinglong " is public A kind of preparation method of dry mixing combined lightweight aggregate concrete is opened.Wherein cement 100-350 parts, 50-150 parts of flyash, it is dry husky/ 100-250 parts of rock wool industrial residue, 6 parts of rubber powder, 2 parts of fiber and 25-70 parts of polyurethane particles.Not to polyurethane in this method The partial size of particle distinguishes, and is not directed to influence of the polyurethane particles grade matching to light aggregate concrete performance.In addition, should It is higher to cement and flyash use ratio in method.

A kind of patent " dry mixing combined lightweight aggregate concrete application number based on inorganic modified polyurethane particles CN108751827A " (substantive examination discloses) disclose a kind of side that light aggregate concrete is prepared using inorganic modified polyurethane particles Method.Wherein, inorganic modified polyurethane particles 38-135 parts by weight, cement 162-485 parts by weight, flyash 30-127 parts by weight, Miberal powder 23-50 parts by weight, silicon ash 3-50 parts by weight, dry sand 37-740 parts by weight, additive 4.6-19.7 parts by weight and water 105~ 380 parts by weight.This method proposes that the aggregate polyurethane particles progress to dry mixing composite light aggregate is inorganic modified, and optimizes particle Grade distribution.

Existing patented technology prepares light aggregate concrete, concrete system pair for waste polyurethane as aglite emphatically The demand of cementitious material is larger, causes production cost higher.

Summary of the invention

One of the technical problems solved by the present invention is to the brick in building waste be mixed rubbish regeneration activity micro mist application is made Into light-weight aggregate material concrete, the resource utilization of building waste is improved, meanwhile, the dosage of cement, flyash etc. is reduced, is reduced Cost.

Present invention solves the technical problem that recycled fine aggregate be made be applied to second is that the brick in building waste is mixed rubbish In light-weight aggregate material concrete, the resource utilization of building waste is improved, the dosage of inorganic fine aggregate (dry sand) is reduced, reduces production Cost.

Present invention solves the technical problem that third is that mixing the granular-grade that construction refuse regenerated micro mist optimizes powder body material again Match, reduce the porosity of cementitious material system, given full play to the activity of compound spike, has played good secondary hydration " synergistic effect " improves the intensity of dry mixing composite light aggregate.

Present invention solves the technical problem that fourth is that making full use of the multi-angular shape characteristic of recycled fine aggregate, not with partial size Regular waste polyurethane particle, which is easier to overlap, is cross-linked to form firm spacial framework, improves material system consistency, The intensity stabilization of the light aggregate concrete of guarantee.Meanwhile useless construction refuse regenerated aggregate has pozzolanic activity, hydrated cementitious produces Ca (OH) in object₂It can be used as the SiO in exciting agent and brick₂、Al₂O₃Secondary reaction of hydration occurs, generates the new hydraulicity and produces Object further improves the boundary strength between recycled fine aggregate and cement slurry, promotes the intensity of light aggregate concrete.

In a first aspect, the present invention provides a kind of dry mixing combined lightweight aggregate concrete, including cement, active regeneration are micro- Powder, component A recycled fine aggregate, dry sand, polyurethane particles, additive and water, the component A in flyash and miberal powder one Kind or two kinds.

According to certain embodiments of the present invention, the concrete includes cement 130-450 parts by weight, active regeneration micro mist 15-95 parts by weight, component A12-55 parts by weight, recycled fine aggregate 10-75 parts by weight, dry sand 10-180 parts by weight, polyurethane Grain 30-100 parts by weight, additive 6-26 parts by weight and water 80-350 parts by weight.

According to the preferred embodiment of the present invention, in the concrete, the weight of regeneration activity fine powder is no more than 25%, then The weight of raw fine aggregate is no more than 30%.If adding proportion is higher, the intensity of concrete can be declined.

Concrete according to the present invention, to guarantee that dry mixing combined lightweight aggregate concrete has certain fluidity and construction Performance, additive used are that cellulose, rubber powder, powder waterproofing agent, polycarboxylic acids high-effect water-proof agent etc. are used in combination with certain proportion, Ensure construction refuse regenerated micro mist, recycled fine aggregate and waste polyurethane power applications into light aggregate concrete.

According to certain embodiments of the present invention, the additive includes cellulose, rubber powder, powder waterproofing agent, water-reducing agent And early strength agent.

According to certain embodiments of the present invention, the additive includes cellulose 1-3 parts by weight, rubber powder 1.5-5.5 weight Measure part, powder waterproofing agent 1.5-6 parts by weight, water-reducing agent 1.5-7.5 parts by weight and early strength agent 0.5-4 parts by weight.

The concrete according to the present invention, to guarantee that dry mixing combined lightweight aggregate concrete meets lightweight and certain compression strength Requirement, certain grain class distribution optimization must be carried out to waste polyurethane, while being mixed with construction refuse regenerated fine aggregate, So that dry mixing composite light aggregate aggregate forms stable bulk density, dry mixing combined lightweight aggregate concrete performance is further ensured that Stability.

According to certain embodiments of the present invention, the polyurethane particles include the first polyurethane particles and the second polyurethane Particle, wherein the partial size of the first polyurethane particles and the second polyurethane particles is different.

According to the preferred embodiment of the present invention, the partial size of first polyurethane particles is 2-5mm, the second poly- ammonia The partial size of ester particle is 6-19mm.

According to certain embodiments of the present invention, the concrete include the first polyurethane particles 10-45 parts by weight, second Polyurethane particles 10-55 parts by weight.

Concrete according to the present invention, construction refuse regenerated fine aggregate and waste polyurethane surface layer are porous knots Structure, using as aggregate has biggish water imbibition, causes dry mixing composite light aggregate water consumption larger.To control light-weight aggregate coagulation Native water-cement ratio stablizes gelling system hydration reaction, promotes light aggregate concrete intensity, and the present invention is used powder waterproofing agent and glue Gel material and aggregate are mixed, and the water-cement ratio effectively reduced guarantees it within 0.55.

According to certain embodiments of the present invention, the grade of the recycled fine aggregate is 0.15-5mm.

According to certain embodiments of the present invention, the partial size of the active regeneration micro mist is at 10 μm or less.

According to certain embodiments of the present invention, the specific surface area of the active regeneration micro mist is greater than 1000m²/ kg, activity Index is greater than 95%.

Concrete according to the present invention, the active regeneration fine powder are the warp of regenerative micro powder made of brick mixed building rubbish The activation fine powder obtained after physical excitation is crossed, specific surface area is greater than 1000m²/ kg, so that 28 days activity of regeneration activity fine powder Index is more conducive to hydration reaction close to S95 grades of miberal powder activity (activity index is greater than 95%).And common brick mixed building regeneration 28 days activity indexs of fine powder are only 60-65%, compared with regeneration activity fine powder, cannot promote late strength of concrete.This hair Bright regeneration activity micro mist fineness is smaller, can preferably be scattered in cementitious material system, reduces cementitious material voidage；Regeneration Fine aggregate and waste polyurethane belong to irregular shape, and needing to carry out gradation just can be such that light aggregate concrete performance stablizes, both Keep lightweight that there is certain heat insulation effect again.

Concrete according to the present invention, must be by building waste activity again in the dry mixing combined lightweight aggregate concrete Raw micro mist and flyash or miberal powder mix uses again, by building waste active regeneration fine powder and flyash or miberal powder with certain proportion into Row mixes in multiple admixture light aggregate concrete system, and the disadvantage that both can have effectively overcome simple building waste micro mist intrinsic may be used also More preferably to play the microparticle effect and aquation synergistic effect of composite granule, cementitious material system hydration activity is promoted, is being promoted Material cost is reduced while intensity.

According to certain embodiments of the present invention, the compound proportion of the active regeneration micro mist and component A are 0.5-10:1.

According to the preferred embodiment of the present invention, the compound proportion of the active regeneration micro mist and component A are 0.5-2:1.

In second aspect, the present invention provides a kind of preparation methods of concrete according to first aspect, comprising:

Step A: building waste is obtained into regenerative micro powder and recycled fine aggregate after processing；

Step B: regenerative micro powder physical excitation is obtained into active regeneration micro mist；

Step C: cement, active regeneration micro mist, component A, dry husky, recycled fine aggregate and additive are mixed, mixed Object；

Step D: the resulting mixture of step C is mixed with polyurethane particles, obtains dry mixing composite light aggregate.

Step E: the resulting dry mixing composite light aggregate of step D is mixed with water, obtains the dry mixing composite light aggregate coagulation Soil.

According to certain embodiments of the present invention, in step A, the processing includes sorting, screening, broken and grinding.

According to certain embodiments of the present invention, in step B, the step of physical excitation includes being less than partial size The fine powder of 0.15mm carries out grinding, and after preferably grinding 0.5 hour, then carrying out superfine grinding to fine powder partial size is 10 μm or less.Object The principle of reason excitation is that powder is milled to certain partial size, increases specific surface area, increases reactivity.Combination grinding can improve ratio Surface area and increase defect or activated centre quantity, distortion of lattice occurs for grain surface layer, active site increases, thus improve Activity.

In the third aspect, the present invention provides a kind of concrete according to first aspect or according to second aspect Application of the obtained concrete of preparation method in building trade.

What the present invention obtained has the technical effect that following several respects:

1, building waste resource reutilization new way has been widened, the building waste level of resources utilization is improved.

2, by mixing building waste active regeneration micro mist again, light aggregate concrete cement consumption 5-25% can be reduced.

3, the certain ratio of building waste active regeneration fine powder and flyash or miberal powder is mixed again, can effectively promotes work Change reaction.

4, by mixing construction refuse regenerated fine aggregate, it is possible to reduce normal sand dosage 10-30%, and and waste polyurethane Particle forms good gradation.The intrinsic irregular shape of construction refuse regenerated aggregate and be in porous structure, can with it is waste and old poly- Urethane particle effectively forms stable grade distribution structure, promotes material system bulk density, promotes light aggregate concrete intensity.

5, active regeneration micro mist is made using building waste and recycled fine aggregate is added in light aggregate concrete, facilitate Consumption of the construction industry to natural aggregate is reduced, the exploitation of the energy and ore in sand form is reduced, alleviates pressure and drop because of raw material scarcity The low destruction because of ecological environment caused by a large amount of minings.

Detailed description of the invention

Fig. 1 is the preparation flow figure according to the dry mixing combined lightweight aggregate concrete of an embodiment of the invention.

Specific embodiment

The present invention will be described further by specific embodiment below, it should be appreciated that the scope of the present invention is not It is limited to this.