CN111559889A - Self-repairing concrete, prefabricated recycled aggregate concrete composite floor slab and preparation method - Google Patents
Self-repairing concrete, prefabricated recycled aggregate concrete composite floor slab and preparation method Download PDFInfo
- Publication number
- CN111559889A CN111559889A CN202010217488.9A CN202010217488A CN111559889A CN 111559889 A CN111559889 A CN 111559889A CN 202010217488 A CN202010217488 A CN 202010217488A CN 111559889 A CN111559889 A CN 111559889A
- Authority
- CN
- China
- Prior art keywords
- concrete
- recycled
- aggregate
- self
- prefabricated
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000004567 concrete Substances 0.000 title claims abstract description 146
- 239000002131 composite material Substances 0.000 title claims abstract description 92
- 238000002360 preparation method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 38
- 238000002156 mixing Methods 0.000 claims abstract description 35
- 230000001580 bacterial effect Effects 0.000 claims abstract description 20
- 239000004615 ingredient Substances 0.000 claims abstract description 19
- 244000005700 microbiome Species 0.000 claims abstract description 12
- 230000000813 microbial effect Effects 0.000 claims abstract description 9
- 241000193469 Clostridium pasteurianum Species 0.000 claims abstract description 8
- 229910000831 Steel Inorganic materials 0.000 claims description 51
- 239000010959 steel Substances 0.000 claims description 51
- 241000606860 Pasteurella Species 0.000 claims description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 25
- 230000002787 reinforcement Effects 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 22
- 239000002245 particle Substances 0.000 claims description 22
- 239000004568 cement Substances 0.000 claims description 20
- 241000193830 Bacillus <bacterium> Species 0.000 claims description 18
- 239000004576 sand Substances 0.000 claims description 16
- 239000004575 stone Substances 0.000 claims description 16
- 230000008569 process Effects 0.000 claims description 8
- 238000003466 welding Methods 0.000 claims description 7
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000002791 soaking Methods 0.000 claims description 5
- 238000001179 sorption measurement Methods 0.000 claims description 4
- 238000007598 dipping method Methods 0.000 claims description 3
- 238000005470 impregnation Methods 0.000 claims description 2
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 20
- 238000005336 cracking Methods 0.000 description 16
- 230000000052 comparative effect Effects 0.000 description 14
- 238000010276 construction Methods 0.000 description 13
- 239000002699 waste material Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000008439 repair process Effects 0.000 description 8
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 description 6
- 230000008901 benefit Effects 0.000 description 6
- 239000004570 mortar (masonry) Substances 0.000 description 6
- 239000000047 product Substances 0.000 description 5
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- 241000193395 Sporosarcina pasteurii Species 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000011068 loading method Methods 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 239000011178 precast concrete Substances 0.000 description 3
- 238000004064 recycling Methods 0.000 description 3
- 229910000029 sodium carbonate Inorganic materials 0.000 description 3
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 239000000428 dust Substances 0.000 description 2
- 238000010891 electric arc Methods 0.000 description 2
- 229910052500 inorganic mineral Inorganic materials 0.000 description 2
- 239000011707 mineral Substances 0.000 description 2
- 235000010755 mineral Nutrition 0.000 description 2
- 239000010451 perlite Substances 0.000 description 2
- 235000019362 perlite Nutrition 0.000 description 2
- 102000004169 proteins and genes Human genes 0.000 description 2
- 108090000623 proteins and genes Proteins 0.000 description 2
- 230000008929 regeneration Effects 0.000 description 2
- 238000011069 regeneration method Methods 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910000030 sodium bicarbonate Inorganic materials 0.000 description 2
- 235000017557 sodium bicarbonate Nutrition 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- 241000179039 Paenibacillus Species 0.000 description 1
- 241001668579 Pasteuria Species 0.000 description 1
- 230000001133 acceleration Effects 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 238000004364 calculation method Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 229910001567 cementite Inorganic materials 0.000 description 1
- 230000001112 coagulating effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000001963 growth medium Substances 0.000 description 1
- 230000000887 hydrating effect Effects 0.000 description 1
- KSOKAHYVTMZFBJ-UHFFFAOYSA-N iron;methane Chemical compound C.[Fe].[Fe].[Fe] KSOKAHYVTMZFBJ-UHFFFAOYSA-N 0.000 description 1
- 238000009630 liquid culture Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007102 metabolic function Effects 0.000 description 1
- 238000006241 metabolic reaction Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000006911 nucleation Effects 0.000 description 1
- 238000010899 nucleation Methods 0.000 description 1
- 235000015097 nutrients Nutrition 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000004092 self-diagnosis Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Images
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B11/00—Apparatus or processes for treating or working the shaped or preshaped articles
- B28B11/24—Apparatus or processes for treating or working the shaped or preshaped articles for curing, setting or hardening
- B28B11/245—Curing concrete articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B19/00—Machines or methods for applying the material to surfaces to form a permanent layer thereon
- B28B19/0092—Machines or methods for applying the material to surfaces to form a permanent layer thereon to webs, sheets or the like, e.g. of paper, cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28B—SHAPING CLAY OR OTHER CERAMIC COMPOSITIONS; SHAPING SLAG; SHAPING MIXTURES CONTAINING CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28B23/00—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects
- B28B23/02—Arrangements specially adapted for the production of shaped articles with elements wholly or partly embedded in the moulding material; Production of reinforced objects wherein the elements are reinforcing members
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B5/00—Floors; Floor construction with regard to insulation; Connections specially adapted therefor
- E04B5/02—Load-carrying floor structures formed substantially of prefabricated units
- E04B5/10—Load-carrying floor structures formed substantially of prefabricated units with metal beams or girders, e.g. with steel lattice girders
-
- 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
- C04B2111/72—Repairing or restoring existing buildings or building materials
-
- 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
Abstract
The invention discloses self-repairing concrete, a prefabricated recycled aggregate concrete composite floor slab and a preparation method thereof, wherein the self-repairing concrete is microbial self-repairing concrete and consists of concrete ingredients, recycled aggregate and bacillus pasteurianus bacterial liquid according to volume percentage; the volume mixing amount of the recycled aggregate is 15-45% of the total volume of the microorganism self-repairing concrete, and the volume mixing amount of the bacillus pasteurianus bacterial liquid is 40-50% of the total volume of the microorganism self-repairing concrete. According to the prefabricated recycled aggregate concrete composite floor slab, the microorganism self-repairing concrete is adopted for pouring the specific part, the cracked part of the concrete composite column can be reinforced in a targeted manner, the service performance of the composite floor slab is improved, the crack can be automatically repaired, and the service life is prolonged.
Description
Technical Field
The invention relates to a composite column in building engineering, relates to self-repairing concrete, a prefabricated recycled aggregate concrete composite floor slab and a preparation method thereof, and particularly relates to the self-repairing concrete and the preparation method thereof, the prefabricated recycled aggregate concrete composite floor slab and the preparation method thereof.
Background
The composite floor slab can be called a floor bearing plate, a floor cover plate and a steel bearing plate, and the composite floor slab is formed by the following steps that a profiled steel plate is used as a permanent template of a concrete floor slab, is used as a lower stressed steel bar of the floor slab, participates in stress calculation of the floor slab and works together with concrete.
With the acceleration of industrialization and urbanization, the construction industry is rapidly developed, and the quantity of the generated construction waste is increased. However, most of the construction wastes are transported to suburbs or villages without any treatment, and are piled or buried in the open air, so that a large amount of construction expenses such as land charge and garbage clearing and transporting expenses are consumed, and meanwhile, the problems of scattering, dust, sand flying and the like in the clearing and piling processes cause serious environmental pollution. In the prior art, the construction waste is sorted, removed or crushed by a construction waste recycling production line to obtain a part of recycled aggregate, and the recycled aggregate can replace natural aggregate to a certain extent. The recycled aggregate is reasonably utilized to replace the natural aggregate, so that the effects of changing waste into valuable, saving energy, reducing emission, having remarkable economic benefit and the like are achieved.
In recent years, the country vigorously develops assembly type buildings, wherein the composite floor slab is a necessary component in the building, all components of the composite floor slab are prefabricated in a factory and then transported to a construction site for assembly, so that time and labor are saved, and the composite floor slab has many incomparable advantages; the method has the advantages that templates do not need to be erected, watering and maintenance are not needed, water resources and maintenance time are saved, the construction period is greatly shortened, consumption of field materials and equipment is reduced, and harm of dust, noise and the like to the society caused by traditional building construction is reduced. But the prior composite floor slab inevitably generates cracks during the use process. The cracks of the composite floor slab are serious problems that the appearance is influenced even the use is influenced if the cracks are small, and the structure safety is influenced if the cracks are large, are the root of the cracks, and are not different from design factors, construction factors, material factors and use factors. And because the limitation of current detection technology, it still has great degree of difficulty to detect and repair these microcracks and adopt traditional artifical later stage to repair the maintenance method, and not only economic cost is high and the restoration effect can show the degradation with time for composite floor crack repair becomes the bottleneck problem that hinders composite floor wider application. Therefore, there is a need for a composite floor slab with self-diagnosis and self-repair of cracks, which meets the special requirements of the current building field for composite floor slabs.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides self-repairing concrete and a preparation method thereof, and a prefabricated recycled aggregate concrete composite floor slab and a preparation method thereof. The problems that inevitable cracks are generated in the using process of the existing composite floor slab, the micro cracks are still limited when being detected and repaired, the later repair cost is high and the like are solved.
The self-repairing concrete is microbial self-repairing concrete, and consists of concrete ingredients, recycled aggregate and a bacillus pasteurianus bacterial liquid according to volume percentage;
the volume mixing amount of the recycled aggregate is 15-45% of the total volume of the microorganism self-repairing concrete, and the volume mixing amount of the bacillus pasteurianus bacterial liquid is 40-50% of the total volume of the microorganism self-repairing concrete;
the concrete ingredients comprise sand, stone, cement and water in percentage by volume, wherein the sand comprises the following components: stone: cement: water (3.0-3.2), (1.6-2.0), (1.00-1.3), (0.45-0.65);
the OD value of the pasteurella bacillus liquid is (1-1.2), and the thallus concentration is 2 × 109～ 2.4×109cfu/ml. According to the mass ratio, the recycled aggregate: dry powder of bacillus pasteurii is 1: (0.007-0.013).
The preparation method of the self-repairing concrete is used for preparing the self-repairing concrete, the regeneration aggregate is soaked with the pasteurella bacteria liquid and then is mixed with concrete ingredients, and the process of soaking the pasteurella bacteria liquid with the regeneration aggregate is as follows: and (3) placing the pasteurella bacillus liquid at the low temperature of-4-0 ℃ for 12 hours, then placing the recycled aggregate in a negative pressure vacuum pump, adding the pasteurella bacillus liquid for adsorption, and carrying out impregnation and adsorption for 30-40 min at the vacuum negative pressure of 0.6 Mpa.
Further, the cement is PO42.5 grade, and the density is 3100kg/m3(ii) a The fineness modulus of the sand is 3.0-2.3, and the average particle size is 0.23-0.50 mm; the apparent density of the stone is 2670-2800 kg/m3The water content is 3.35-3.48%, and the water absorption is 1.77-1.91%;
the recycled aggregate is composed of recycled coarse aggregate and recycled fine aggregate, the particle size of the recycled coarse aggregate is 5-10 mm, the particle size of the recycled fine aggregate is less than 5mm, and the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is (1-1.5): 2.8-3.2.
Further, the cement is PO42.5 grade, and the density is 3100kg/m3(ii) a The fineness modulus of the sand is 3.0-2.3, and the average particle size is 0.23-0.50 mm; the apparent density of the stone is 2670-2800 kg/m3The water content is 3.35-3.48%, and the water absorption is 1.77-1.91%;
the recycled aggregate is composed of recycled coarse aggregate and recycled fine aggregate, the particle size of the recycled coarse aggregate is 5-10 mm, the particle size of the recycled fine aggregate is less than 5mm, and the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is (1-1.5): (2-3.2)
A prefabricated recycled aggregate concrete composite floor comprises section steel beams, a prefabricated floor and a plurality of self-repairing concrete layers, wherein the prefabricated floor is arranged along the length direction of the section steel beams, the self-repairing concrete layers are arranged on the prefabricated floor, the prefabricated floor comprises a profiled steel plate and a prefabricated concrete layer, the profiled steel plate is horizontally preset, the prefabricated concrete layer is arranged on the profiled steel plate, and a reinforcement cage is arranged in the prefabricated concrete layer;
the self-repairing concrete layer comprises the self-repairing concrete.
Furthermore, the steel reinforcement cage comprises a plurality of steel reinforcement meshes, the steel reinforcement meshes comprise first steel reinforcements and second steel reinforcements which are perpendicular to each other and evenly distributed, and the first steel reinforcements are parallel to the length direction of the section steel beam.
Furthermore, prefabricated recycled aggregate concrete composite floor still set up the connecting piece, the connecting piece pass profiled sheet and precast concrete layer and shaped steel roof beam fixed connection in proper order, profiled sheet and shaped steel beam perpendicular setting.
Furthermore, the profiled steel sheet is an open floor support plate profiled steel sheet; the connecting piece is a cylindrical welding nail and is welded at the flange position on the section steel beam by adopting electric arc welding to penetrate through the profiled steel sheet.
A method for preparing a prefabricated recycled aggregate concrete composite floor slab comprises the steps of building each part of the prefabricated recycled aggregate concrete composite floor slab according to the structure of the prefabricated recycled aggregate concrete composite floor slab, pouring self-repairing concrete according to claim 1 after building is finished, curing and forming to obtain the prefabricated recycled aggregate concrete composite floor slab, wherein during pouring, a slab bottom is not supported, and other components are supported in a cross-center mode.
Further, the self-repairing concrete is prepared according to the following steps:
the method comprises the steps of dipping a pasteurella bacillus bacterial liquid into a recycled aggregate, and mixing the pasteurella bacillus bacterial liquid with concrete ingredients, wherein the recycled aggregate is composed of recycled coarse aggregate and recycled fine aggregate according to volume percentage, the particle size of the recycled coarse aggregate is 5-10 mm, the particle size of the recycled fine aggregate is smaller than 5mm, the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is 1:2, the volume mixing amount is 35%, the concrete ingredients are calculated according to volume percentage, the concrete ingredients are mixed according to the mixing ratio of sand, stone, cement and water of 3.10:1.75:1.00:0.50, and the volume mixing amount of the pasteurella bacillus bacterial liquid is 45%.
Compared with the prior art, the invention has the following technical effects:
the concrete layer of the composite floor slab adopts the self-made microbial self-repairing concrete to replace the conventional concrete, so that the problems that a large number of cracks are generated on the surface of the composite floor slab due to various reasons when the conventional composite floor slab is adopted, the high economic cost and the repairing effect are obviously degraded along with the service age due to the adoption of the traditional manual later-period repairing and maintaining method are solved; the recycled aggregate is used as a microbial carrier, on one hand, the recycled aggregate becomes a better carrier due to the porous property of the recycled aggregate compared with common aggregate, and on the other hand, the recycled aggregate is used as a product for recycling construction waste, so that the recycled aggregate has the effects of changing waste into valuable, carrying through national energy-saving and environment-friendly policies and the like. The microorganism self-repairing concrete is adopted to pour the specific part, and the cracked part of the concrete composite column can be reinforced in a targeted manner, so that the service performance of the composite floor slab is improved, the crack can be automatically repaired, and the service life is prolonged.
The present invention will be described in further detail with reference to specific embodiments.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic structural view of a self-repairing composite floor slab of an embodiment;
FIG. 2 is a comparison graph (b) of the self-repaired composite floor slab cracks of the example (a) and the repaired cracks after 14 days;
FIG. 3 is a comparison graph of the synchronous repair of cracks of the self-repairing composite floor slabs in the first comparative example (FIG. a), the second comparative example (FIG. b), the third comparative example (FIG. c) and the first example (d);
FIG. 4 is a schematic diagram of several common crack forms of a composite floor slab;
FIG. 5 is a schematic view of the self-repairing concrete poured area in a composite floor slab;
FIG. 6 is a schematic diagram of the crack generated by the test piece under the electron microscope in the first example.
In the drawings, the various reference numbers indicate:
1. profiled steel sheets; 2. a reinforcement cage; 3. reinforcing mesh sheets; 4. a section steel beam; 5. self-repairing concrete layer.
Detailed Description
The structures, proportions, sizes, and other dimensions shown in the drawings and described in the specification are for understanding and reading the present disclosure, and are not intended to limit the scope of the present disclosure, which is defined in the claims, and are not essential to the art, and any structural modifications, changes in proportions, or adjustments in size, which do not affect the efficacy and attainment of the same are intended to fall within the scope of the present disclosure. In addition, the terms "upper", "lower", "left", "right", "middle" and "one" used in the present specification are for clarity of description, and are not intended to limit the scope of the present invention, and the relative relationship between the terms and the terms is not to be construed as a scope of the present invention.
In order to provide a better understanding of the products and methods of the present invention to those skilled in the art, the following examples illustrate the preparation. And compared with comparative examples to illustrate the advantages of the present invention. The equipment used in the present invention is conventional in the art unless otherwise specified.
The recycled aggregate is taken from construction waste and is a product formed by hydrating and coagulating natural aggregate and cement base. Compared with natural aggregate, the surface characteristics of the recycled aggregate are greatly different: the recycled aggregate is coated with a certain amount of mortar and cementite (set cement), and the adhesion degree depends on the aggregate crushing process, equipment and the strength grade of the raw concrete. The crushed recycled aggregate particles have uneven surfaces, are very rough, porous and angular. Compared with natural aggregate, the recycled aggregate is complex in components, and contains a small amount of brick aggregate, mortar aggregate and cement stone aggregate besides the primary natural aggregate, wherein the recycled aggregate is wrapped by old mortar to be in a loose and porous state after being subjected to garbage grading and sorting. Therefore, the inherent porous property of the recycled aggregate adhering mortar enables the recycled aggregate adhering mortar to be feasible for preparing the self-repairing composite floor slab as reinforced recycled aggregate, and meanwhile, the higher strength of the recycled aggregate adhering mortar enables various performances of the self-repairing composite floor slab to be improved.
The principle of crack self-repairing of the self-repairing concrete is as follows: when the concrete layer has fine cracks, the regenerated aggregate particles near the crack parts are cracked due to the expansion of the cracks, water and oxygen in the air enter the concrete through the cracks to cause the dormant Paenibacillus pasteurianus spores to revive, the metabolic function is recovered, the calcium carbonate precipitates are formed to fill the cracks through chemical reaction or biological metabolic reaction with nutrient substances in the self-repairing concrete layer, and the purpose of repairing the cracks is achieved. The presence of the pasteuria bacillus can not only promote the formation of minerals, but also provide nucleation sites for the deposition of minerals.
Pasteurella (Latin's name Bacillus pasteurii) was purchased from Pasteurella strain from institute of microbiology, Shaanxi province. The equipment used in the present invention is conventional in the art unless otherwise specified. The materials used in the present invention are all commercially available unless otherwise specified.
Example 1:
the embodiment provides self-repairing concrete, which is microbial self-repairing concrete, and the microbial self-repairing concrete consists of concrete ingredients, recycled aggregate and a bacillus pasteurianus bacterial liquid according to volume percentage; wherein the volume ratio of the bacterial liquid to the water density value is converted into the mass ratio; the other components are weighed according to the converted mass ratio by volume ratio;
the volume mixing amount of the recycled aggregate is 15-45% of the total volume of the microorganism self-repairing concrete, and the volume mixing amount of the bacillus pasteurianus bacterial liquid is 40-50% of the total volume of the microorganism self-repairing concrete; the concrete ingredients comprise sand, stone, cement and water in percentage by volume, wherein the sand comprises the following components: stone: cement: water (3.0-3.2), (1.6-2.0), (1.00-1.3), (0.45-0.65);
the method specifically comprises the following steps: mixing sand, stone, cement and water according to the mixing ratio of 3.10:1.75:1.00:0.50, and adding a bacillus pasteurii bacterial liquid with the volume mixing amount of 45%, wherein the bacterial liquid volume ratio is converted into the mass ratio of the water density value; the mass ratio of the recycled aggregate to the bacteria is 1: 0.0025.
the OD value of the pasteurella bacillus liquid is 1.2, the mass mixing amount is 0.25 percent of the cement, and the thallus concentration is 2 × 109～2.4×109cfu/ml. The liquid culture medium is formed by mixing organic protein, a sodium carbonate solution and a sodium bicarbonate solution, wherein the mass ratio of the sodium carbonate solution to the sodium bicarbonate solution to the organic protein is 10-20%, and the baume degree of the sodium carbonate solution is 20-50 DEG Be.
The preparation method of the self-repairing concrete is used for preparing the self-repairing concrete, and is specifically formed by soaking a regenerated aggregate into a pasteurella bacteria liquid and then mixing the pasteurella bacteria liquid with concrete ingredients, wherein the process of soaking the regenerated aggregate into the pasteurella bacteria liquid is as follows: the method comprises the steps of placing a pasteurella bacillus liquid purchased from Shaanxi institute of microbiology at a low temperature of-4-0 ℃ for 12 hours, placing the recycled aggregate in a negative pressure vacuum pump, adding the liquid, vibrating and shaking uniformly to enable the liquid to be distributed on the surface of the recycled aggregate more uniformly, adsorbing for 35min under the condition that the vacuum negative pressure is 0.6Mpa, and transferring the recycled aggregate into an oven to dry for 24 hours at a constant temperature of 40 ℃.
The cement is PO42.5 grade, the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is (1-1.5) to (2-3.2), the recycled aggregate of the embodiment is formed by mixing the recycled coarse aggregate and the recycled fine aggregate according to the proportion of 1:2, and the volume mixing amount of the recycled aggregate is 35%; the particle size of the recycled coarse aggregate is 5-10 mm, and the particle size of the recycled fine aggregate is less than 5 mm; the recycled aggregate is formed by mixing recycled coarse aggregate and recycled fine aggregate according to different volume ratios; the recycled aggregate has an apparent density of not more than 1950kg/m3The crushing index was 18.0%, the water content was 1.68%, and the water absorption was 3.93%.
The embodiment also discloses a prefabricated recycled aggregate concrete composite floor slab, which comprises a section steel beam 4, a prefabricated floor slab arranged along the length direction of the section steel beams 4 and a plurality of self-repairing concrete layers 5 arranged on the prefabricated floor slab, wherein the prefabricated floor slab comprises a horizontally preset profiled steel sheet 1 and a prefabricated concrete layer arranged on the profiled steel sheet 1, and a reinforcement cage 2 is arranged in the prefabricated concrete layer;
the self-repairing concrete layer 5 comprises the self-repairing concrete, namely the microbial self-repairing concrete, and can also comprise common self-repairing concrete.
According to the specification of composite floor slab design and construction Specifications (CECS-2732010), sand, stone, cement, water and microorganism-impregnated recycled aggregate in a specific ratio are mixed and stirred to prepare the self-repairing concrete for pouring the self-repairing concrete layer.
The reinforcement cage 2 comprises a plurality of reinforcement meshes 3, the reinforcement meshes 3 comprise first reinforcements and second reinforcements which are perpendicular to each other and evenly distributed, and the first reinforcements are parallel to the length direction of the section steel beam 4. The reinforcing mesh 3 is arranged at the same height.
Prefabricated recycled aggregate concrete composite floor still sets up connecting piece 3, and connecting piece 3 passes profiled sheet 1 and precast concrete layer and shaped steel beam 4 fixed connection in proper order, and profiled sheet 1 sets up with shaped steel beam 4 is perpendicular, and is optional, and profiled sheet 1 is opening floor carrier plate profiled sheet 1. The connecting piece 3 is a cylindrical welding nail and is welded at the flange position on the section steel beam 4 by adopting electric arc welding to penetrate through the profiled steel sheet 1.
Therefore, the embodiment also provides a preparation method of the prefabricated recycled aggregate concrete composite floor slab, each part of the prefabricated recycled aggregate concrete composite floor slab is built according to the structure of the prefabricated recycled aggregate concrete composite floor slab, after the building is finished, the self-repairing concrete is poured, the profiled steel plate and the reinforcement cage are poured into a whole by the self-repairing concrete layer 5, the floor slab width, the slab span, the steel beam support, the beam height, the flange width and the like are selected according to the actual situation on the premise of meeting the composite floor slab design and construction specification (CECS 273:2010), and the profiled steel beam is perpendicular to the slab ribs of the floor slab. And cylindrical head welding nails are adopted to sequentially penetrate through the profiled steel sheet 1 and the precast concrete layer to be fixedly connected with the section steel beam 4 to form the precast recycled aggregate concrete composite floor slab, the slab bottom is not supported during pouring, and other components are supported in a span-in mode.
As one of the preferred embodiments, the self-repairing concrete is prepared by the following steps:
the method comprises the steps of dipping a pasteurella bacillus bacterial liquid into a recycled aggregate, and mixing the pasteurella bacillus bacterial liquid with concrete ingredients, wherein the recycled aggregate is composed of recycled coarse aggregate and recycled fine aggregate according to volume percentage, the particle size of the recycled coarse aggregate is 5-10 mm, the particle size of the recycled fine aggregate is smaller than 5mm, the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is 1:2, the volume mixing amount is 35%, the concrete ingredients are calculated according to volume percentage, the concrete ingredients are mixed according to the mixing ratio of sand, stone, cement and water of 3.10:1.75:1.00:0.50, and the volume mixing amount of the pasteurella bacillus bacterial liquid is 45%.
The cracking form of the composite floor under various loads is realized, and the generation of cracks and the tendency of further cracking are reduced by adopting a mode of pouring microorganism self-repairing concrete at the position easy to crack. According to different loads, different crack cracking positions can be estimated, and the self-repairing concrete pouring areas are different.
Under the preparation conditions of example 1, the composite floor slab exhibited the following cracking patterns: the cracks appear on the whole face, the direction of the cracks is vertical to the plate ribs sometimes, but basically on a straight line, the adjacent cracks are in a parallel state, and the concrete within the range of about 20mm on two sides of the cracks looks drier. As shown in fig. 4 (d). For the crack cracking form, a pouring mode shown as fig. 5(c) is adopted, wherein the shaded part represents the self-repairing concrete pouring area.
The ultimate load bearing capacity of the composite floor is controlled by the longitudinal shear resistance of the composite face. The load test is carried out on the self-repairing composite floor slab taking the recycled aggregate as the carrier, the existing self-repairing composite floor slab taking the expanded perlite as the carrier and the common concrete composite floor slab, and the ultimate bearing capacity of the single-span simply-supported composite floor slab is researched. Test piece 1, test piece 2 and test piece 3 represent the different individualities of the same batch of test pieces respectively, reduce the error that concrete discreteness caused.
The test results are shown in table 1, from which it can be seen that: the ultimate bearing capacity of the repaired self-repairing composite floor slab taking the recycled aggregate as the carrier is higher than that of a self-repairing composite floor slab taking the expanded perlite as the carrier and a common concrete composite floor slab, and the ultimate bearing capacity is respectively improved by 6.63% and 11.52%.
TABLE 1 ultimate bearing capacity of different concrete composite floorslab
Fig. 6 is a schematic diagram of the product of the prefabricated recycled aggregate concrete composite floor slab in example 1 at the crack under the electron microscope.
Example 2 (comparative example 1):
the embodiment provides an assembled prefabricated recycled aggregate self-repairing concrete composite floor slab, and the preparation method is the same as that of embodiment 1; except that no recycled aggregate was added in this comparative example.
Further, the crack form basically appears at the corner where the composite floor slab and the column intersect under the condition, the column corner generates a state that the crack extends to the rear of the composite floor slab, the crack is in a T shape, the transverse crack of the T-shaped crack develops around the edge of the column, the vertical crack and the transverse crack develop at a certain included angle, the development direction is deviated to the main beam along the direction of the plate rib, but not develops along the direction of 45 degrees, the crack in the form generally appears in a smaller range, and the influence on the structure is not great.
The composite floor slab has a crack cracking form as shown in fig. 4(a), and a pouring mode as shown in fig. 5(a) is adopted for the crack cracking form, wherein the shaded part represents the self-repairing concrete pouring area.
Example 3 (comparative example 2):
the embodiment provides an assembled prefabricated recycled aggregate self-repairing concrete composite floor slab, and the preparation method is the same as that of embodiment 1; except that the amount of the recycled aggregate was 15%.
Under the condition, the crack forms appear on the whole board surface, the crack trend is parallel to the board ribs, the concrete looks drier in a certain width range at two sides of the crack, and the drying belt is wider than those of other crack forms. This form of cracking does not generally affect the structural load bearing capacity.
The composite floor slab has a crack cracking form as shown in fig. 4(b), and a pouring mode as shown in fig. 5(b) is adopted for the crack cracking form, wherein the shaded part represents the self-repairing concrete pouring area.
Example 4 (comparative example 3):
the embodiment provides an assembled prefabricated recycled aggregate self-repairing concrete composite floor slab, and the preparation method is the same as that of embodiment 1; except that the amount of the recycled aggregate added was 25%.
The crack form appears on following the girder axis of plate rib direction under this condition, and cracked width and length are general great, and a large amount, and the structure is not changed in the appearance of the crack of this kind of form, generally can not reduce the structure bearing capacity, but this crack if not in time control, can produce a large amount of cracks, finally influences structure normal use.
The composite floor slab has a crack cracking form as shown in fig. 4(c), and a pouring mode as shown in fig. 5(c) is adopted for the crack cracking form, wherein the shaded part represents the self-repairing concrete pouring area.
Example 5 (comparative example 4):
the comparative example provides an assembled prefabricated recycled aggregate self-repairing concrete composite floor slab, and the preparation method is the same as that of the embodiment 1; the difference is that the recycled aggregate is formed by mixing recycled coarse aggregate and recycled fine aggregate according to the proportion of 1: 1.
The composite floor slab has a crack cracking form as shown in fig. 4(d), and a pouring mode as shown in fig. 5(c) is adopted for the crack cracking form, wherein the shaded part represents the self-repairing concrete pouring area.
Example 6 (comparative example 5):
the comparative example provides an assembled prefabricated recycled aggregate self-repairing concrete composite floor slab, and the preparation method is the same as that of the embodiment 1; the difference is that the recycled aggregate is formed by mixing recycled coarse aggregate and recycled fine aggregate according to the proportion of 1: 3.
The composite floor slab has a crack cracking form as shown in fig. 4(d), and a pouring mode as shown in fig. 5(c) is adopted for the crack cracking form, wherein the shaded part represents the self-repairing concrete pouring area.
The test piece of the embodiment is placed still for 48 hours after being poured and molded, and is demoulded, and cracks are preset after the test piece is cured for 7 days under the conditions of 85 +/-5% RH and 22 +/-2 ℃. The test adopts a reaction frame, a 300KN hydraulic jack is fixed on a box-shaped steel beam of the reaction frame, equivalent uniform load is acted on a floor slab through a secondary loading distribution beam, the pre-pressure is applied by 5KN in each test, the test is repeated twice, and then the zero position is reset. The load is gradually increased by 5KN per level, and when fine cracks appear in the span of the floor slab, the increment of the load level is reduced to 2KN, and the load is gradually increased until expected cracks appear. Observing the development condition of the side cracks through a 150X crack observer in the loading process, measuring and recording the width of the cracks developed on each pressed surface of each test piece, stopping loading when the side surface of each test piece has a crack of 0.2-0.5 mm, unloading after the test piece holds the load for 90s, and selecting 3 cracks with the crack width of 0.25-0.40 mm from each test piece for marking after the test pieces are taken down; and then, the test piece is watered and maintained, the performance and the specific components of the product after 0 day, 7 days, 14 days, 21 days and 28 days of repair are respectively measured by a 150X crack observer and an electron scanning microscope (10000X), and the measurement of the residual crack width value is the average value of the measurement of 3 cracks. The measurement results are shown in tables 2 and 3:
TABLE 2 fracture repair procedure at different substitution rates
Through test comparison, the closing degree of the crack of the self-repairing composite floor slab with the replacement rate of 35% of the recycled aggregate carrier in the comparative example is optimal compared with the repairing effect of the crack of the self-repairing composite floor slab with other replacement rates at the same time, the self-repairing composite floor slab with the recycled aggregate carrier poured on the basis of the replacement rate can achieve the best self-repairing efficiency, the mechanical property of the self-repairing composite floor slab is guaranteed, and the self-repairing composite floor slab has high practicability and economy.
TABLE 3 crack repair procedure at different mix ratios
The test comparison shows that the self-repairing composite floor slab with the mixing ratio of the recycled coarse and fine aggregates of 1:2 in the comparative example has the optimal crack closing degree compared with the repairing effect under other mixing ratios in the same time, and the self-repairing composite floor slab with the recycled aggregate carrier poured on the basis of the mixing ratio can achieve the optimal self-repairing efficiency, ensure the mechanical property of the self-repairing composite floor slab, and has extremely high practicability and economical efficiency.
The self-repairing composite floor slab with the recycled aggregate carrier provided by the embodiment has the advantages that the service performance is improved, the crack can be automatically repaired, the service life is prolonged, and the effects of building waste recycling and good performance of the microorganism self-repairing concrete structure are achieved.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, it should be noted that the above-mentioned embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
The preferred embodiments of the present disclosure are described in detail with reference to the accompanying drawings, however, the present disclosure is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present disclosure within the technical idea of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
It should be noted that, in the foregoing embodiments, various features described in the above embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, various combinations that are possible in the present disclosure are not described again.
In addition, any combination of the various embodiments of the present disclosure can be made, and the same should be considered as the inventive content of the present disclosure, as long as the combination does not depart from the spirit of the present disclosure.
Claims (10)
1. The self-repairing concrete is characterized by being microbial self-repairing concrete, wherein the microbial self-repairing concrete consists of concrete ingredients, recycled aggregate and a bacillus pasteurianus bacterial liquid according to volume percentage;
the volume mixing amount of the recycled aggregate is 15-45% of the total volume of the microorganism self-repairing concrete, and the volume mixing amount of the bacillus pasteurianus bacterial liquid is 40-50% of the total volume of the microorganism self-repairing concrete;
the concrete ingredients comprise sand, stone, cement and water in percentage by volume, wherein the sand comprises the following components: stone: cement: water (3.0-3.2), (1.6-2.0), (1.00-1.3), (0.45-0.65);
the OD value of the pasteurella bacillus liquid is (1-1.2), and the thallus concentration is 2 × 109～2.4×109cfu/ml。
2. The preparation method of the self-repairing concrete is characterized in that the self-repairing concrete is prepared by soaking a recycled aggregate into a pasteurella bacteria liquid and then mixing the pasteurella bacteria liquid with concrete ingredients, and the process of soaking the pasteurella bacteria liquid by the recycled aggregate is as follows: and (3) placing the pasteurella bacillus liquid at the low temperature of-4-0 ℃ for 12 hours, then placing the recycled aggregate in a negative pressure vacuum pump, adding the pasteurella bacillus liquid for adsorption, and carrying out impregnation and adsorption for 30-40 min at the vacuum negative pressure of 0.6 Mpa.
3. The self-repairing concrete according to claim 1, characterized in that the cement is PO42.5 grade and has a density of 3100kg/m3(ii) a The fineness modulus of the sand is 3.0-2.3, and the average particle size is 0.23-0.50 mm; the apparent density of the stone is 2670-2800 kg/m3The water content is 3.35-3.48%, and the water absorption is 1.77-1.91%;
the recycled aggregate is composed of recycled coarse aggregate and recycled fine aggregate, the particle size of the recycled coarse aggregate is 5-10 mm, the particle size of the recycled fine aggregate is less than 5mm, and the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is (1-1.5): 2-3.2.
4. The method for preparing the self-repairing concrete according to claim 2, wherein the cement is PO42.5 grade and has a density of 3100kg/m3(ii) a The fineness modulus of the sand is 3.0-2.3, and the average particle size is 0.23-0.50 mm; the apparent density of the stone is 2670-2800 kg/m3The water content is 3.35-3.48%, and the water absorption is 1.77-1.91%;
the recycled aggregate is composed of recycled coarse aggregate and recycled fine aggregate, the particle size of the recycled coarse aggregate is 5-10 mm, the particle size of the recycled fine aggregate is less than 5mm, and the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is (1-1.5): 2-3.2.
5. The prefabricated recycled aggregate concrete composite floor is characterized by comprising section steel beams (4), a prefabricated floor arranged along the length direction of the section steel beams (4) and a plurality of self-repairing concrete layers (5) arranged on the prefabricated floor, wherein the prefabricated floor comprises a horizontally preset profiled steel plate (1) and a prefabricated concrete layer arranged on the profiled steel plate (1), and a reinforcement cage (2) is arranged in the prefabricated concrete layer;
the self-repairing concrete layer (5) comprises the self-repairing concrete of any one of claims 1 or 3.
6. The prefabricated recycled aggregate concrete composite floor slab as claimed in claim 5, wherein the reinforcement cage (2) comprises a plurality of reinforcement meshes (3), the reinforcement meshes (3) comprise first reinforcements and second reinforcements which are uniformly arranged and perpendicular to each other, and the first reinforcements are parallel to the length direction of the section steel beam (4).
7. The prefabricated recycled aggregate concrete composite floor slab as claimed in claim 6, wherein the prefabricated recycled aggregate concrete composite floor slab is further provided with a connecting piece (3), the connecting piece (3) sequentially penetrates through the profiled steel sheet (1) and the prefabricated concrete layer to be fixedly connected with the section steel beam (4), and the profiled steel sheet (1) and the section steel beam (4) are vertically arranged.
8. The prefabricated recycled aggregate concrete composite floor slab as claimed in claim 5, wherein the profiled steel sheet (1) is an open deck profiled steel sheet; the connecting piece (3) is a cylindrical welding nail and penetrates through the profiled steel sheet (1) by arc welding to be welded at the flange position on the profiled steel beam (4).
9. A preparation method of a prefabricated recycled aggregate concrete composite floor slab is characterized in that each component of the prefabricated recycled aggregate concrete composite floor slab is built according to the structure of the prefabricated recycled aggregate concrete composite floor slab as claimed in any one of claims 5 to 8, after the building is finished, the self-repairing concrete as claimed in claim 1 or 3 is poured, the prefabricated recycled aggregate concrete composite floor slab is obtained through curing and forming, during pouring, the slab bottom is not supported, and other components are supported in a cross-center mode.
10. The method for preparing the prefabricated recycled aggregate concrete composite floor slab as claimed in claim 9, wherein the self-repairing concrete is prepared by the following steps:
the method comprises the steps of dipping a pasteurella bacillus bacterial liquid into a recycled aggregate, and mixing the pasteurella bacillus bacterial liquid with concrete ingredients, wherein the recycled aggregate is composed of recycled coarse aggregate and recycled fine aggregate according to volume percentage, the particle size of the recycled coarse aggregate is 5-10 mm, the particle size of the recycled fine aggregate is smaller than 5mm, the mass ratio of the recycled coarse aggregate to the recycled fine aggregate is 1:2, the volume mixing amount is 35%, the concrete ingredients are calculated according to volume percentage, the concrete ingredients are mixed according to the mixing ratio of sand, stone, cement and water of 3.10:1.75:1.00:0.50, and the volume mixing amount of the pasteurella bacillus bacterial liquid is 45%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010217488.9A CN111559889A (en) | 2020-03-25 | 2020-03-25 | Self-repairing concrete, prefabricated recycled aggregate concrete composite floor slab and preparation method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010217488.9A CN111559889A (en) | 2020-03-25 | 2020-03-25 | Self-repairing concrete, prefabricated recycled aggregate concrete composite floor slab and preparation method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111559889A true CN111559889A (en) | 2020-08-21 |
Family
ID=72070342
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010217488.9A Pending CN111559889A (en) | 2020-03-25 | 2020-03-25 | Self-repairing concrete, prefabricated recycled aggregate concrete composite floor slab and preparation method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111559889A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112551973A (en) * | 2020-12-04 | 2021-03-26 | 陈中华 | Anti-cracking self-repairing concrete and preparation method thereof |
| CN114105531A (en) * | 2021-11-05 | 2022-03-01 | 安徽科博建材科技有限公司 | Method for producing high-performance concrete by utilizing solid wastes |
| DE102021119002A1 (en) | 2021-07-22 | 2023-01-26 | Solidian Gmbh | Layered surface protection system |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003206166A (en) * | 2002-01-11 | 2003-07-22 | Kajima Corp | Method for reproducing aggregate and apparatus therefor |
| CN108532810A (en) * | 2018-04-19 | 2018-09-14 | 沈阳建筑大学 | A kind of recycled concrete superposed composite floor of steel plate- |
| CN208219952U (en) * | 2018-04-19 | 2018-12-11 | 沈阳建筑大学 | A kind of recycled concrete superposed composite floor of steel plate- |
| CN110423065A (en) * | 2019-07-30 | 2019-11-08 | 西安建筑科技大学 | It is a kind of using regenerated coarse aggregate as the self-repair concrete of carrier and preparation method |
| CN110482928A (en) * | 2019-07-30 | 2019-11-22 | 西安建筑科技大学 | It is a kind of using recycled fine aggregate as self-repair concrete of carrier and preparation method thereof |
| CN110563400A (en) * | 2019-07-30 | 2019-12-13 | 西安建筑科技大学 | crack self-repairing partition plate with mixed recycled coarse and fine aggregates and preparation method thereof |
-
2020
- 2020-03-25 CN CN202010217488.9A patent/CN111559889A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003206166A (en) * | 2002-01-11 | 2003-07-22 | Kajima Corp | Method for reproducing aggregate and apparatus therefor |
| CN108532810A (en) * | 2018-04-19 | 2018-09-14 | 沈阳建筑大学 | A kind of recycled concrete superposed composite floor of steel plate- |
| CN208219952U (en) * | 2018-04-19 | 2018-12-11 | 沈阳建筑大学 | A kind of recycled concrete superposed composite floor of steel plate- |
| CN110423065A (en) * | 2019-07-30 | 2019-11-08 | 西安建筑科技大学 | It is a kind of using regenerated coarse aggregate as the self-repair concrete of carrier and preparation method |
| CN110482928A (en) * | 2019-07-30 | 2019-11-22 | 西安建筑科技大学 | It is a kind of using recycled fine aggregate as self-repair concrete of carrier and preparation method thereof |
| CN110563400A (en) * | 2019-07-30 | 2019-12-13 | 西安建筑科技大学 | crack self-repairing partition plate with mixed recycled coarse and fine aggregates and preparation method thereof |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112551973A (en) * | 2020-12-04 | 2021-03-26 | 陈中华 | Anti-cracking self-repairing concrete and preparation method thereof |
| DE102021119002A1 (en) | 2021-07-22 | 2023-01-26 | Solidian Gmbh | Layered surface protection system |
| CN114105531A (en) * | 2021-11-05 | 2022-03-01 | 安徽科博建材科技有限公司 | Method for producing high-performance concrete by utilizing solid wastes |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN106830777B (en) | The regeneration fill concrete of consumer waste incineration residue preparation and its application | |
| CN111559889A (en) | Self-repairing concrete, prefabricated recycled aggregate concrete composite floor slab and preparation method | |
| CN110482928B (en) | Self-repairing concrete with recycled fine aggregate as carrier and preparation method thereof | |
| CN112110705B (en) | Self-repairing semi-rigid base material for recycling construction waste | |
| CN107382216A (en) | Fill high-strength concrete of iron tailings and building waste and preparation method thereof | |
| CN1181008C (en) | Black light concrete for paving layer of bridge | |
| Iyer | An overview of cementitious construction materials | |
| CN110563400B (en) | Crack self-repairing partition plate with mixed recycled coarse and fine aggregates and preparation method thereof | |
| CN104496337B (en) | Nano clay modified fiber cement mortar and preparation method thereof | |
| Nikolay et al. | Cost-effective design of long cylindrical shells of high-strength sand concrete | |
| CN107117894A (en) | Permeable pavement brick containing building refuse brick tiling fine aggregate and preparation method thereof | |
| CN1908316A (en) | Method for arch dam fast construction by externally mixing MgO slightly expanded concrete | |
| CN101942869A (en) | Manufacturing method of recycled low-strength concrete wall beam | |
| CN110510941B (en) | Self-repairing bearing building block with recycled fine aggregate as carrier and preparation method thereof | |
| CN111333387A (en) | Self-repairing concrete, mixed coarse and fine aggregate fabricated comprehensive pipe gallery and preparation method | |
| CN107129259B (en) | Green lightweight tension bamboo reinforced concrete prefabricated section | |
| CN115259714A (en) | Recycling method of waste concrete solid waste | |
| CN111734050A (en) | Self-repairing concrete, prefabricated embedded column core concrete combined column and preparation method | |
| Katzer et al. | Harnessing waste fine aggregatefor sustainable production of concrete precast elements | |
| CN109748550A (en) | The preparation method of regenerated aggregate concrete ecological brick | |
| CN112777979B (en) | Anti-abrasion gallery ultra-high performance concrete based on waste glass aggregate and preparation method thereof | |
| Rajan et al. | Innovative Brick Manufacturing using Papercrete | |
| CN104418550A (en) | Concrete solid pile | |
| CN114804788B (en) | Coral-cement-based composite material, preparation method, use method and application thereof | |
| Liu et al. | Potential use of recycled aggregate as a self-healing concrete carrier |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200821 |