CN112250378A - Roller compacted concrete and production process thereof - Google Patents
Roller compacted concrete and production process thereof Download PDFInfo
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- CN112250378A CN112250378A CN202011001117.3A CN202011001117A CN112250378A CN 112250378 A CN112250378 A CN 112250378A CN 202011001117 A CN202011001117 A CN 202011001117A CN 112250378 A CN112250378 A CN 112250378A
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- 239000011382 roller-compacted concrete Substances 0.000 title claims abstract description 69
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 18
- 239000004567 concrete Substances 0.000 claims abstract description 111
- 239000002699 waste material Substances 0.000 claims abstract description 109
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 99
- 239000004568 cement Substances 0.000 claims abstract description 84
- 239000000843 powder Substances 0.000 claims abstract description 81
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 59
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 50
- 239000010959 steel Substances 0.000 claims abstract description 50
- 239000002893 slag Substances 0.000 claims abstract description 49
- 235000019738 Limestone Nutrition 0.000 claims abstract description 48
- 230000004907 flux Effects 0.000 claims abstract description 48
- 239000006028 limestone Substances 0.000 claims abstract description 48
- 238000010276 construction Methods 0.000 claims abstract description 40
- 239000002994 raw material Substances 0.000 claims abstract description 30
- 230000001172 regenerating effect Effects 0.000 claims abstract description 12
- 238000007873 sieving Methods 0.000 claims description 55
- 239000002245 particle Substances 0.000 claims description 51
- 239000000463 material Substances 0.000 claims description 49
- 239000004927 clay Substances 0.000 claims description 32
- 239000011449 brick Substances 0.000 claims description 31
- 239000000203 mixture Substances 0.000 claims description 30
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 claims description 28
- 229910052863 mullite Inorganic materials 0.000 claims description 28
- 238000002156 mixing Methods 0.000 claims description 27
- JQJCSZOEVBFDKO-UHFFFAOYSA-N lead zinc Chemical compound [Zn].[Pb] JQJCSZOEVBFDKO-UHFFFAOYSA-N 0.000 claims description 19
- 239000002002 slurry Substances 0.000 claims description 19
- 238000000034 method Methods 0.000 claims description 11
- 238000007580 dry-mixing Methods 0.000 claims description 3
- 239000012535 impurity Substances 0.000 claims description 2
- 238000003756 stirring Methods 0.000 description 46
- 239000004575 stone Substances 0.000 description 36
- 238000003825 pressing Methods 0.000 description 30
- 239000003245 coal Substances 0.000 description 25
- 229920001730 Moisture cure polyurethane Polymers 0.000 description 24
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 23
- 239000004576 sand Substances 0.000 description 22
- 239000012783 reinforcing fiber Substances 0.000 description 20
- 229920001451 polypropylene glycol Polymers 0.000 description 18
- DVKJHBMWWAPEIU-UHFFFAOYSA-N toluene 2,4-diisocyanate Chemical compound CC1=CC=C(N=C=O)C=C1N=C=O DVKJHBMWWAPEIU-UHFFFAOYSA-N 0.000 description 18
- PTBDIHRZYDMNKB-UHFFFAOYSA-N 2,2-Bis(hydroxymethyl)propionic acid Chemical compound OCC(C)(CO)C(O)=O PTBDIHRZYDMNKB-UHFFFAOYSA-N 0.000 description 15
- 239000011398 Portland cement Substances 0.000 description 14
- 239000002253 acid Substances 0.000 description 14
- 239000000839 emulsion Substances 0.000 description 14
- 239000010419 fine particle Substances 0.000 description 12
- 239000011083 cement mortar Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 10
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 9
- 238000006116 polymerization reaction Methods 0.000 description 9
- 229920006306 polyurethane fiber Polymers 0.000 description 8
- OWIKHYCFFJSOEH-UHFFFAOYSA-N Isocyanic acid Chemical group N=C=O OWIKHYCFFJSOEH-UHFFFAOYSA-N 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 7
- 238000007599 discharging Methods 0.000 description 7
- 230000008929 regeneration Effects 0.000 description 6
- 238000011069 regeneration method Methods 0.000 description 6
- 239000007787 solid Substances 0.000 description 6
- 239000008187 granular material Substances 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 238000009490 roller compaction Methods 0.000 description 2
- 238000012216 screening Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000004743 Polypropylene Substances 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- XLJMAIOERFSOGZ-UHFFFAOYSA-N anhydrous cyanic acid Natural products OC#N XLJMAIOERFSOGZ-UHFFFAOYSA-N 0.000 description 1
- 239000011324 bead Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- HDERJYVLTPVNRI-UHFFFAOYSA-N ethene;ethenyl acetate Chemical group C=C.CC(=O)OC=C HDERJYVLTPVNRI-UHFFFAOYSA-N 0.000 description 1
- 229920001038 ethylene copolymer Polymers 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- TUJKJAMUKRIRHC-UHFFFAOYSA-N hydroxyl Chemical compound [OH] TUJKJAMUKRIRHC-UHFFFAOYSA-N 0.000 description 1
- 239000012948 isocyanate Substances 0.000 description 1
- IQPQWNKOIGAROB-UHFFFAOYSA-N isocyanate group Chemical group [N-]=C=O IQPQWNKOIGAROB-UHFFFAOYSA-N 0.000 description 1
- 150000002513 isocyanates Chemical class 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
- -1 polypropylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
- 238000010008 shearing Methods 0.000 description 1
- 229910052814 silicon oxide Inorganic materials 0.000 description 1
- 238000003892 spreading Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009941 weaving Methods 0.000 description 1
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
-
- 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
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
The application relates to the technical field of concrete, and particularly discloses roller compacted concrete and a production process thereof. The roller compacted concrete is mainly prepared from the following raw materials in parts by weight: cement 300-320 parts, fine aggregate 580-625 parts, coarse aggregate 890-950 parts, steel slag powder 100-125 parts, water reducing agent 8-15 parts, and water 110-125 parts; the coarse aggregate is composed of flux limestone macadam, coarse-grained regenerative aggregate and sandstone macadam in a weight ratio of 10-15:35-50:20-30, and the coarse-grained regenerative aggregate is made of construction waste. The roller compacted concrete has higher later strength and lower shrinkage rate.
Description
Technical Field
The application relates to the technical field of concrete, in particular to roller compacted concrete and a production process thereof.
Background
Concrete is widely applied in building engineering, and can be divided into various types according to different application fields. The roller compacted concrete is dry and hard concrete with less water consumption and lower slump, has the advantages of quick construction, short construction period, cement consumption saving, less unit water consumption, less dryness, high initial strength and the like, and is usually subjected to roller compaction construction by using a roller compaction machine. Because the cement consumption is small, the cement is beneficial to the temperature control anti-cracking and mechanized operation of concrete, and is commonly used for projects with very large concrete demand, such as hydraulic engineering and the like.
The requirement of roller compacted concrete for coarse aggregate is not high, but the cost of the concrete still accounts for a higher proportion of the overall engineering cost due to the very large using amount of the roller compacted concrete. In order to reduce the cost of roller compacted concrete, it is common to replace part of the coarse or fine aggregate with part of the industrial or engineering waste.
The application publication No. CN110963767A of the invention discloses a roller compacted concrete, which comprises 5-10 parts by mass of Portland cement, 10-15 parts by mass of converter steel slag powder, 10-15 parts by mass of construction waste with the grain diameter of 1-5mm, 60-75 parts by mass of construction waste with the grain diameter of 5-25mm and water with the dosage of 0.2-0.3 time of cement and steel slag powder. The roller compacted concrete adopts a large amount of converter steel slag and construction waste, so that the cost of the roller compacted concrete is greatly reduced.
In view of the above-mentioned related technologies, the inventors believe that the compressive strength of the roller compacted concrete needs to be improved, and it is difficult to meet the needs of large-scale engineering.
Disclosure of Invention
In order to improve the strength of the roller compacted concrete, the application provides the roller compacted concrete and a production process thereof.
In a first aspect, the application provides a roller compacted concrete which adopts the following technical scheme:
the roller compacted concrete is mainly prepared from the following raw materials in parts by weight: cement 300-320 parts, fine aggregate 580-625 parts, coarse aggregate 890-950 parts, steel slag powder 100-125 parts, water reducing agent 8-15 parts, and water 110-125 parts; the coarse aggregate is composed of flux limestone macadam, coarse-grained regenerative aggregate and sandstone macadam in a weight ratio of 10-15:35-50:20-30, and the coarse-grained regenerative aggregate is made of construction waste.
By adopting the technical scheme, the flux limestone macadam, the sandstone macadam and the coarse-grained recycled aggregate are mixed to form the mixed coarse aggregate in the roller compacted concrete, so that the strength of the concrete is ensured, and the overall cost of the concrete is reduced.
Preferably, the roller compacted concrete is mainly prepared from the following raw materials in parts by weight: 320 parts of cement, 605 parts of fine aggregate, 625 parts of coarse aggregate, 920 parts of coarse aggregate, 125 parts of steel slag powder, 10-15 parts of water reducing agent and 125 parts of water; the coarse aggregate is composed of flux limestone macadam, coarse-grained regenerative aggregate and sandstone macadam in a weight ratio of 10-15:40-50:25-30, and the coarse-grained regenerative aggregate is made of construction waste.
By adopting the technical scheme, the composition of the roller compacted concrete is optimized, so that the raw materials are fully exerted and cooperated with each other, and the strength of the roller compacted concrete is further improved.
Preferably, the particle size ratio of the flux limestone macadam, the coarse-grained reclaimed aggregate and the sandstone macadam is 16-19:26.5-31.5: 19-26.5.
By adopting the technical scheme, the particle size of the flux limestone is smaller, the particle size of the coarse-grained regenerated aggregate is the largest, the particle size of the sandstone is between the two, and the flux limestone macadam is filled among other coarse aggregate particles, so that the high pressure resistance and the adhesion of the flux limestone can be fully utilized, and the stability among the coarse aggregates is improved. The compressive capacity of the sandstone is slightly weak, but the shearing resistance is strong, and the overall mechanical property of the coarse aggregate can be improved by matching with the other two coarse aggregates.
Preferably, the coarse grain regenerated aggregate is obtained by crushing, impurity removing, rounding and grading the construction waste; the construction waste is at least one of concrete waste and clay brick waste.
Through adopting above-mentioned technical scheme, after coarse grain regeneration aggregate through breakage, edulcoration, rounding, coarse grain regeneration aggregate's granule is more mellow and more, is difficult for taking place in the use phenomenon such as arris, fragmentation, has reduced the cracked probability of concrete appearance, has also improved roller compacted concrete's intensity.
Preferably, the construction waste consists of concrete waste and clay brick waste in a weight ratio of 4-5: 1.
Through adopting above-mentioned technical scheme, construction waste has adopted more concrete waste and less clay waste, and the concrete waste has guaranteed the intensity that the coarse grain regenerated aggregate, and the clay brick waste material has certain water absorption performance, can fix a small amount of moisture in the concrete, shrink when reducing the concrete loss of water to a certain extent.
Preferably, the raw material also comprises 45-65 parts by weight of mullite powder.
By adopting the technical scheme and adding the mullite powder, the low shrinkage performance of the mullite powder can be utilized to further reduce the shrinkage rate of the concrete.
Preferably, the raw material also comprises 10-18 parts by weight of lead-zinc tailings.
By adopting the technical scheme, the lead-zinc tailings contain more silicon oxide and aluminum oxide components, and gel substances with stronger viscosity can be generated in an alkaline environment and distributed among aggregate particles, so that the overall bonding strength of concrete is further improved.
In a second aspect, the roller compacted concrete production process provided by the application adopts the following technical scheme:
the production process of the roller compacted concrete comprises the following steps:
1) uniformly mixing cement, steel slag powder and water to prepare cement slurry;
uniformly mixing the coarse aggregate and cement paste to prepare premix;
2) and (3) uniformly mixing the premix, the fine aggregate and the water reducing agent to obtain the water reducing agent.
By adopting the technical scheme, cement and steel slag powder are mixed with water to prepare cement paste, and then the cement paste is uniformly mixed with the coarse aggregate, so that the cement paste can be adhered and wrapped on the surface of the coarse aggregate, and the raw materials are uniformly and fully mixed.
Preferably, the step 1) of uniformly mixing the coarse aggregate and the cement slurry is to uniformly dry and mix the flux limestone broken stone, the coarse recycled aggregate and the sandstone broken stone, and then uniformly mix the mixture and the cement slurry.
By adopting the technical scheme, the flux limestone broken stone, the coarse-grained reclaimed aggregate and the sandstone broken stone are uniformly mixed in a dry mixing manner, the three can be fully mixed, and the phenomenon that part of aggregates are bonded together by viscous components after the coarse aggregates are firstly mixed with water and are not easy to disperse is reduced.
Preferably, the coarse reclaimed aggregate is produced by a method comprising the steps of: crushing the construction waste, then sieving for 20-30min in a cylindrical sieve at the rotating speed of 300-500rpm, and taking oversize materials to sieve, thus obtaining the coarse grain regenerated aggregate.
Through adopting above-mentioned technical scheme, carry out the breakage with the concrete waste material, rotate the screening in the drum sieve, can wipe off corner, the bead of the concrete waste material of large granule, make it become more mellow granule.
In summary, the present application has the following advantageous effects
1. The application of roller compacted concrete adopts the mixture of flux limestone, coarse grain regeneration aggregate and sandstone as coarse aggregate, can utilize the characteristics of different coarse aggregates, improves the overall strength of the coarse aggregates, can also improve the binding force between the coarse aggregates and between other raw materials, increases the strength of roller compacted concrete, and reduces the shrinkage rate of concrete.
2. In the roller compacted concrete's production technology of this application, the coarse grain regeneration is gathered materials and is adopted the building rubbish waste material to sieve through the drum sieve, utilizes the rounding of screening in-process screen cloth to the building rubbish waste material granule, has obtained the more even, the more regular coarse grain regeneration of appearance of granule and gathers materials, has reduced the coarse grain regeneration and gathers materials the breakage in the use, has fallen the arris phenomenon, has further improved the whole mechanical properties of concrete.
Detailed Description
The present application will be described in further detail with reference to examples.
The roller compacted concrete is mainly prepared from the following raw materials in parts by weight: cement 300-320 parts, fine aggregate 580-625 parts, coarse aggregate 890-950 parts, steel slag powder 100-125 parts, water reducing agent 8-15 parts, and water 110-125 parts; the coarse aggregate is composed of flux limestone macadam, coarse-grained regenerative aggregate and sandstone macadam in a weight ratio of 10-15:35-50:20-30, and the coarse-grained regenerative aggregate is made of construction waste.
Preferably, the coarse aggregate consists of flux limestone broken stones, coarse-grained reclaimed aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. Preferably, the coarse aggregate has a particle size of 16 to 31.5 mm. More preferably, the particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse-grained reclaimed aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm.
The cement is preferably PO42.5 ordinary portland cement.
The fine aggregate is composed of natural sand and fine regenerated aggregate in a weight ratio of 2-3: 1. Preferably, the fine aggregate consists of natural sand and fine reclaimed aggregate in a weight ratio of 3: 1. The particle sizes of the natural sand and the fine particle reclaimed aggregate are both 1.18-2.36 mm. The fine particle reclaimed aggregate is made of construction waste.
The specific surface area of the steel slag powder is 300-450m2In terms of/kg. Preferably 450m2In terms of/kg. Further preferably, the raw material also comprises 20-30 parts by weight of coal gangue. The particle size of the coal gangue is preferably 0.5-1 mm. Preferably 1 mm.
Further preferably, the raw materials also comprise 15 to 25 weight parts of polyurethane prepolymer. More preferably, the raw material also comprises 6 to 10 weight parts of dimethylolpropionic acid. Further preferably, the raw material also comprises 5 to 10 parts by weight of reinforcing fiber. The reinforcing fibers are preferably polyurethane fibers. Further preferably, the length of the reinforcing fibers is 15 mm. More preferably, the raw material also comprises 25 to 35 weight parts of VAE (vinyl acetate-ethylene copolymer) emulsion. Preferably, the VAE emulsion has a solids content of 55% and a viscosity of 2500 mPas.
The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 1-2:1 during the reaction. Preferably, the molar ratio of isocyanate groups in toluene-2, 4-diisocyanate to hydroxyl groups in polypropylene glycol is 2: 1.
Preferably, the particle size of the mullite powder is 150-300 μm. The grain diameter of the lead-zinc tailings is 4.75-9.5 mm. Preferably 4.75 mm. Preferably, the water reducing agent is a polycarboxylic acid water reducing agent.
Respectively crushing the concrete waste and the clay brick waste, and then adding the crushed concrete waste and the clay brick waste into a cylindrical sieve with the aperture of 26.5mm according to the weight ratio of 4-5:1, and sieving the crushed concrete waste and the clay brick waste for 20-30min at the rotating speed of 300-500rpm to obtain regenerated oversize products and regenerated undersize products. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
The production process of the roller compacted concrete comprises the following steps: 1) uniformly mixing cement, steel slag powder and water to prepare cement slurry; uniformly mixing the coarse aggregate and cement paste to prepare premix; 2) and (3) uniformly mixing the premix, the fine aggregate and the water reducing agent to obtain the water reducing agent.
The step 1) of uniformly mixing the cement, the steel slag powder and the water is to uniformly dry-mix the cement and the steel slag powder and then uniformly mix the mixture with the water. The cement and the steel slag powder are stirred and mixed evenly for 2-3 min. Then mixing with water and stirring at the rotation speed of 180-200rpm for 1-2 min.
The step 1) of uniformly mixing the coarse aggregate and the cement slurry is to uniformly dry and mix the flux limestone broken stone, the coarse-grained reclaimed aggregate and the sandstone broken stone, and then uniformly mix the mixture and the cement slurry. The flux limestone macadam, the coarse-grained reclaimed aggregate and the sandstone macadam are stirred and mixed evenly for 3-5 min. Then evenly mixing with cement paste, and stirring for 1-2min at the rotating speed of 60-80 rpm. Further preferably, mixing the coarse aggregate with the polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 30rpm for 3 min; then adding cement paste and mixing uniformly. Further preferably, a VAE emulsion is added when the coarse aggregate is mixed with the polyurethane prepolymer and dimethylolpropionic acid. Preferably, lead-zinc tailings are also added when the flux limestone macadam, the coarse-grained reclaimed aggregate and the sandstone macadam are mixed in a dry mixing manner.
The coarse-grained reclaimed aggregate is prepared by a method comprising the following steps: crushing the construction waste, then sieving for 20-30min in a cylindrical sieve at the rotating speed of 300-500rpm, and taking oversize materials to sieve, thus obtaining the coarse grain regenerated aggregate. The diameter of the screen hole of the cylindrical screen is 26.5 mm. Preferably, the coarse-grained recycled aggregate is prepared by crushing the concrete waste and the clay brick waste respectively, adding the crushed materials into a cylindrical sieve according to the weight ratio of 4-5:1, sieving the materials on the sieve for 20-30min at the rotating speed of 300-500rpm, and sieving the materials on the sieve to obtain the coarse-grained recycled aggregate. Preferably, the coarse-grained recycled aggregate is prepared by crushing the concrete waste and the clay brick waste respectively, then adding the crushed materials into a cylindrical sieve according to the weight ratio of 5:1, sieving the materials at the rotating speed of 500rpm for 20min, and sieving the materials on the sieve to obtain the coarse-grained recycled aggregate. Further preferably, after the cylindrical screen is screened for 20-30min at the rotating speed of 300-500rpm, undersize materials are taken out and screened to obtain fine regenerated aggregates. Further preferably, the concrete waste and the clay brick waste are respectively crushed and then added into a 26.5mm cylindrical sieve according to the weight ratio of 5:1, and the mixture is sieved at the rotating speed of 500rpm for 20min to obtain a regenerated oversize product and a regenerated undersize product. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
In the step 2), the premix, the fine aggregate and the water reducing agent are uniformly mixed and stirred for 3-5min at the rotating speed of 30-50 rpm.
Conveying the mixture prepared in the step 2) to a construction area, and layering, paving and compacting. The layered paving comprises the steps of sequentially unloading, leveling and compacting to obtain a compacted concrete layer, then unloading on the compacted concrete layer, leveling and compacting, and the like. The thickness of the mixing material layer after each layer of the material is put in the bin is 35-50 cm. The thickness of the compacted concrete layer is 30-45 cm. And spreading a layer of cement mortar on the upper compacted concrete layer before unloading after the upper compacted concrete layer is obtained.
The rolling comprises initial pressing, re-pressing and final pressing which are sequentially carried out, wherein the speed of the initial pressing is 1-1.5km/h, the speed of the re-pressing is 1.5-2km/h, and the speed of the final pressing is 3-4 km/h.
Preferably, the cement mortar is prepared by mixing water, cement and natural sand in a mass ratio of 1:2: 1.
Preferably, the cylindrical screen comprises a cylindrical screen mesh with a horizontal axis, and the cylindrical screen mesh is formed by weaving steel wires with a circular or rectangular cross section.
Example 1
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 300.0kg of cement, 580.0kg of fine aggregate, 890.0kg of coarse aggregate, 100.0kg of steel slag powder, 8.0kg of water reducing agent and 110.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand with the grain diameter of 1.18-2.36 mm. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 10:35: 20. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm. The coarse grain regenerated aggregate is oversize material obtained by crushing concrete waste and sieving the crushed concrete waste in a cylinder sieve at the rotating speed of 300rpm for 30 min. The specific surface area of the steel slag powder is 300m2In terms of/kg. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve, operating the cylindrical sieve at the rotating speed of 300rpm for 30min, and discharging oversize materials to obtain coarse-grained regenerated aggregates;
2) adding cement and steel slag powder into a stirrer, stirring for 2min, adding water, and stirring at a rotating speed of 180rpm for 2min to obtain cement slurry;
adding the flux limestone macadam, the coarse-grained regenerated aggregate and the sandstone macadam into a stirrer and stirring for 5min to obtain coarse aggregate; then adding cement paste, and stirring at the rotating speed of 60rpm for 2min to obtain a premix;
3) adding fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 30rpm for 5min to prepare a mixture;
4) transporting the mixture prepared in the step 3) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 35cm, primarily pressing once at the speed of 1.5km/h by using a vibrating compactor, secondarily pressing once at the speed of 2km/h, and finally pressing once at the speed of 4km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 30 cm;
5) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Example 2
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 310.0kg of cement, 605.0kg of fine aggregate, 920.0kg of coarse aggregate, 120.0kg of steel slag powder, 45.0kg of mullite powder, 20.0kg of coal gangue, 10.0kg of water reducing agent and 120.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand with the grain diameter of 1.18-2.36 mm. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 10:40: 25. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm. The coarse grain regenerated aggregate is oversize material obtained by crushing concrete waste and sieving the crushed concrete waste in a cylinder sieve at the rotating speed of 500rpm for 20 min. The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 150 mu m. The grain diameter of the coal gangue is 0.5 mm. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve, operating the cylindrical sieve at the rotating speed of 400rpm for 25min, and discharging oversize materials to obtain coarse-grained regenerated aggregates;
2) adding cement, steel slag powder, mullite powder and coal gangue powder into a stirrer, stirring for 2.5min, adding water, and stirring at 185rpm for 1.5min to obtain cement slurry;
adding flux limestone broken stones, coarse-grained regenerated aggregates and sandstone broken stones into a stirrer and stirring for 4min to obtain coarse aggregates; then adding cement paste, and stirring at the rotating speed of 80rpm for 1min to obtain a premix;
3) adding fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 50rpm for 3min to prepare a mixture;
4) transporting the mixture prepared in the step 3) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 50cm, primarily pressing once at the speed of 1km/h by using a vibrating compactor, then re-pressing once at the speed of 1.5km/h, and finally pressing once at the speed of 3km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 45 cm;
5) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Example 3
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 310.0kg of cement, 605.0kg of fine aggregate, 920.0kg of coarse aggregate, 120.0kg of steel slag powder, 50.0kg of mullite powder, 15.0kg of polyurethane prepolymer, 6.0kg of dimethylolpropionic acid, 25.0kg of coal gangue, 10.0kg of water reducing agent and 120.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand with the grain diameter of 1.18-2.36 mm. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone broken stone is 16-19mm, and the coarse particlesThe grain diameter of the regenerated aggregate is 26.5-31.5mm, and the grain diameter of the sandstone crushed stone is 19-26.5 mm. The coarse grain regenerated aggregate is oversize material obtained by crushing concrete waste and sieving the crushed concrete waste in a cylinder sieve at the rotating speed of 500rpm for 20 min. The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The grain diameter of the coal gangue is 1 mm. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve, operating the cylindrical sieve at the rotating speed of 500rpm for 20min, and discharging oversize materials to obtain coarse-grained regenerated aggregates;
2) adding cement, steel slag powder, mullite powder and coal gangue powder into a stirrer, stirring for 3min, adding water, and stirring at the rotating speed of 200rpm for 1min to obtain cement slurry;
adding the flux limestone macadam, the coarse-grained regenerated aggregate and the sandstone macadam into a stirrer, and stirring for 5min at the rotating speed of 30rpm to obtain coarse aggregate; mixing the coarse aggregate with the polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 30rpm for 3 min; then adding cement slurry, and stirring at the rotating speed of 75rpm for 1.5min to obtain a premix;
3) adding fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 45rpm for 4min to prepare a mixture;
4) transporting the mixture prepared in the step 3) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 35cm, primarily pressing once at the speed of 1km/h by using a vibrating compactor, then re-pressing once at the speed of 1.5km/h, and finally pressing once at the speed of 3km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 30 cm;
5) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Example 4
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 310.0kg of cement, 605.0kg of fine aggregate, 920.0kg of coarse aggregate, 120.0kg of steel slag powder, 50.0kg of mullite powder, 20.0kg of polyurethane prepolymer, 8.0kg of dimethylolpropionic acid, 25.0kg of coal gangue, 5.0kg of reinforcing fiber, 10.0kg of water reducing agent and 120.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand with the grain diameter of 1.18-2.36 mm. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm. The coarse grain regenerated aggregate is oversize material obtained by crushing concrete waste and sieving the crushed concrete waste in a cylinder sieve at the rotating speed of 450rpm for 25 min. The specific surface area of the steel slag powder is 450m2/kg。
The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The grain diameter of the coal gangue is 1 mm. The reinforcing fiber is polyurethane fiber. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve, operating the cylindrical sieve at the rotating speed of 450rpm for 25min, and discharging oversize materials to obtain coarse-grained regenerated aggregates;
2) adding cement, steel slag powder, mullite powder, coal gangue powder and reinforcing fibers into a stirrer, stirring for 2.5min, then adding water, and stirring at the rotating speed of 200rpm for 1min to prepare cement paste;
adding the flux limestone macadam, the coarse-grained regenerated aggregate and the sandstone macadam into a stirrer, and stirring for 4min at the rotating speed of 70rpm to obtain coarse aggregate; mixing the coarse aggregate with the polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 30rpm for 3 min; then adding cement slurry, and stirring at the rotating speed of 75rpm for 2min to obtain a premix;
3) adding fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 45rpm for 4min to prepare a mixture;
4) transporting the mixture prepared in the step 3) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 50cm, primarily pressing once at the speed of 1km/h by using a vibrating compactor, then re-pressing once at the speed of 1.5km/h, and finally pressing once at the speed of 3km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 45 cm;
5) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Example 5
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 310.0kg of cement, 605.0kg of fine aggregate, 920.0kg of coarse aggregate, 120.0kg of steel slag powder, 50.0kg of mullite powder, 20.0kg of polyurethane prepolymer, 8.0kg of dimethylolpropionic acid, 25.0kg of coal gangue, 5.0kg of reinforcing fiber, 10.0kg of lead-zinc tailings, 10.0kg of water reducing agent and 120.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement.
The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm. The fine aggregate is composed of natural sand and fine regenerated aggregate in a weight ratio of 3:1, and the particle sizes of the natural sand and the fine regenerated aggregate are both 1.18-2.36 mm.
Respectively crushing the concrete waste and the clay brick waste, and then adding the crushed concrete waste and the clay brick waste into a 26.5mm cylindrical sieve according to the weight ratio of 4:1, and sieving the crushed concrete waste and the clay brick waste for 25min at the rotating speed of 450rpm to obtain regenerated oversize products and regenerated undersize products. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared from toluene-2, 4-diisocyanThe acid ester is prepared by polymerization reaction of polypropylene glycol, and the molar ratio of isocyanic acid radical in toluene-2, 4-diisocyanate to hydroxyl radical in polypropylene glycol is 1: 1. The grain diameter of the coal gangue is 1 mm. The reinforcing fiber is polyurethane fiber. The grain size of the lead-zinc tailings is 4.75 mm. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete comprises the following steps:
1) respectively crushing the concrete waste and the clay brick waste by using a crusher, then mixing and adding the crushed materials into a cylindrical sieve according to the weight ratio of 4:1, operating the cylindrical sieve at the rotating speed of 450rpm for 25min, and discharging oversize materials to obtain coarse-grained regenerated aggregates; sieving the undersize materials by a sieve with 2.36mm, and then sieving the undersize materials by a sieve with 1.18mm to obtain fine regenerated aggregates;
2) adding cement, steel slag powder, mullite powder, coal gangue powder and reinforcing fibers into a stirrer, stirring for 2.5min, then adding water, and stirring at the rotating speed of 200rpm for 1min to prepare cement paste;
adding flux limestone macadam, coarse-grained regenerated aggregate, sandstone macadam and lead-zinc tailings into a stirrer, and stirring at the rotating speed of 75rpm for 4min to obtain coarse aggregate; mixing the coarse aggregate with the polyurethane prepolymer and dimethylolpropionic acid, and stirring at the rotating speed of 30rpm for 3 min; then adding cement slurry, and stirring at the rotating speed of 70rpm for 2min to obtain a premix;
3) adding fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 45rpm for 3min to prepare a mixture;
4) transporting the mixture prepared in the step 3) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 50cm, primarily pressing once at the speed of 1km/h by using a vibrating compactor, then re-pressing once at the speed of 1.5km/h, and finally pressing once at the speed of 3km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 45 cm;
5) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Example 6
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 310.0kg of cement, 605.0kg of fine aggregate, 920.0kg of coarse aggregate, 120.0kg of steel slag powder, 50.0kg of mullite powder, 20.0kg of polyurethane prepolymer, 8.0kg of dimethylolpropionic acid, 25.0kg of coal gangue, 10.0kg of reinforcing fiber, 10.0kg of lead-zinc tailings, 25.0kg of VAE emulsion, 12.0kg of water reducing agent and 125.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm. The fine aggregate is composed of natural sand and fine particle regenerated aggregate according to the weight ratio of 2:1, and the particle sizes of the natural sand and the fine particle regenerated aggregate are 1.18-2.36 mm.
Respectively crushing the concrete waste and the clay brick waste, and then adding the crushed concrete waste and the clay brick waste into a 26.5mm cylindrical sieve according to the weight ratio of 5:1, and sieving the crushed concrete waste and the clay brick waste for 20min at the rotating speed of 500rpm to obtain regenerated oversize products and regenerated undersize products. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The grain diameter of the coal gangue is 1 mm. The reinforcing fiber is polyurethane fiber. The grain size of the lead-zinc tailings is 4.75 mm. The VAE emulsion has a solids content of 55% and a viscosity of 2500 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete comprises the following steps:
1) respectively crushing the concrete waste and the clay brick waste by using a crusher, then mixing and adding the crushed materials into a cylindrical sieve according to the weight ratio of 5:1, operating the cylindrical sieve at the rotating speed of 450rpm for 25min, and discharging oversize materials to obtain coarse-grained regenerated aggregates; sieving the undersize materials by a sieve with 2.36mm, and then sieving the undersize materials by a sieve with 1.18mm to obtain fine regenerated aggregates;
2) adding cement, steel slag powder, mullite powder, coal gangue powder and reinforcing fibers into a stirrer, stirring for 2.5min, then adding water, and stirring at the rotating speed of 200rpm for 1min to prepare cement paste;
adding flux limestone macadam, coarse-grained regenerated aggregate, sandstone macadam and lead-zinc tailings into a stirrer, and stirring at the rotating speed of 75rpm for 4min to obtain coarse aggregate; mixing the coarse aggregate with the polyurethane prepolymer, dimethylolpropionic acid and VAE emulsion, and stirring at the rotating speed of 30rpm for 3 min; then adding cement slurry, and stirring at the rotating speed of 75rpm for 2min to obtain a premix;
3) adding fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 45rpm for 3min to prepare a mixture;
4) transporting the mixture prepared in the step 3) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 50cm, primarily pressing once at the speed of 1km/h by using a vibrating compactor, then re-pressing once at the speed of 1.5km/h, and finally pressing once at the speed of 3km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 45 cm;
5) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Example 7
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 312.0kg of cement, 615.0kg of fine aggregate, 950.0kg of coarse aggregate, 115.0kg of steel slag powder, 55.0kg of mullite powder, 25.0kg of polyurethane prepolymer, 10.0kg of dimethylolpropionic acid, 22.0kg of coal gangue, 8.0kg of reinforcing fiber, 15.0kg of lead-zinc tailings, 30.0kg of VAE emulsion, 15.0kg of water reducing agent and 122.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm. The fine aggregate is composed of natural sand and fine particle regenerated aggregate according to the weight ratio of 2:1, and the particle sizes of the natural sand and the fine particle regenerated aggregate are 1.18-2.36 mm.
Respectively crushing the concrete waste and the clay brick waste, and then adding the crushed concrete waste and the clay brick waste into a 26.5mm cylindrical sieve according to the weight ratio of 5:1, and sieving the crushed concrete waste and the clay brick waste for 20min at the rotating speed of 500rpm to obtain regenerated oversize products and regenerated undersize products. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The grain diameter of the coal gangue is 1 mm. The reinforcing fiber is polyurethane fiber. The grain size of the lead-zinc tailings is 4.75 mm. The VAE emulsion has a solids content of 55% and a viscosity of 2500 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The process for producing the roller compacted concrete of this example is the same as that of example 6.
Example 8
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 315.0kg of cement, 620.0kg of fine aggregate, 930.0kg of coarse aggregate, 125.0kg of steel slag powder, 60.0kg of mullite powder, 22.0kg of polyurethane prepolymer, 7.0kg of dimethylolpropionic acid, 30.0kg of coal gangue, 7.0kg of reinforcing fiber, 12.0kg of lead-zinc tailings, 35.0kg of VAE emulsion, 12.0kg of water reducing agent and 120.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm. The fine aggregate is composed of natural sand and fine particle regenerated aggregate according to the weight ratio of 2:1, and the particle sizes of the natural sand and the fine particle regenerated aggregate are 1.18-2.36 mm.
Respectively crushing the concrete waste and the clay brick waste, and then adding the crushed concrete waste and the clay brick waste into a 26.5mm cylindrical sieve according to the weight ratio of 5:1, and sieving the crushed concrete waste and the clay brick waste for 20min at the rotating speed of 500rpm to obtain regenerated oversize products and regenerated undersize products. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The grain diameter of the coal gangue is 1 mm. The reinforcing fiber is polyurethane fiber. The grain size of the lead-zinc tailings is 4.75 mm. The VAE emulsion has a solids content of 55% and a viscosity of 2500 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The process for producing the roller compacted concrete of this example is the same as that of example 6.
Example 9
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 320.0kg of cement, 625.0kg of fine aggregate, 935.0kg of coarse aggregate, 122.0kg of steel slag powder, 65.0kg of mullite powder, 18.0kg of polyurethane prepolymer, 7.0kg of dimethylolpropionic acid, 28.0kg of coal gangue, 7.0kg of reinforcing fiber, 18.0kg of lead-zinc tailings, 32.0kg of VAE emulsion, 12.0kg of water reducing agent and 125.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm.
The fine aggregate is composed of natural sand and fine particle regenerated aggregate according to the weight ratio of 2:1, and the particle sizes of the natural sand and the fine particle regenerated aggregate are 1.18-2.36 mm.
Respectively crushing the concrete waste and the clay brick waste, and then adding the crushed concrete waste and the clay brick waste into a 26.5mm cylindrical sieve according to the weight ratio of 5:1, and sieving the crushed concrete waste and the clay brick waste for 20min at the rotating speed of 500rpm to obtain regenerated oversize products and regenerated undersize products. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycol, and the molar ratio of isocyanic acid group in the toluene-2, 4-diisocyanate to hydroxyl group in the polypropylene glycol is 2:1 during the reaction. The grain diameter of the coal gangue is 1 mm. The reinforcing fiber is polyurethane fiber. The grain size of the lead-zinc tailings is 4.75 mm. The VAE emulsion has a solids content of 55% and a viscosity of 2500 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The process for producing the roller compacted concrete of this example is the same as that of example 6.
Example 10
The roller compacted concrete of the embodiment is prepared from the following raw materials by weight: 318.0kg of cement, 622.0kg of fine aggregate, 932.0kg of coarse aggregate, 122.0kg of steel slag powder, 60.0kg of mullite powder, 18.0kg of polyurethane prepolymer, 8.0kg of dimethylolpropionic acid, 28.0kg of coal gangue, 7.0kg of reinforcing fiber, 15.0kg of lead-zinc tailings, 30.0kg of VAE emulsion, 12.0kg of water reducing agent and 122.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The coarse aggregate consists of flux limestone broken stones, coarse-grained regenerated aggregate and sandstone broken stones according to the weight ratio of 15:50: 30. The particle size of the flux limestone macadam is 16-19mm, the particle size of the coarse grain regenerated aggregate is 26.5-31.5mm, and the particle size of the sandstone macadam is 19-26.5 mm.
The fine aggregate is composed of natural sand and fine particle regenerated aggregate according to the weight ratio of 2:1, and the particle sizes of the natural sand and the fine particle regenerated aggregate are 1.18-2.36 mm.
Respectively crushing the concrete waste and the clay brick waste, and then adding the crushed concrete waste and the clay brick waste into a 26.5mm cylindrical sieve according to the weight ratio of 5:1, and sieving the crushed concrete waste and the clay brick waste for 20min at the rotating speed of 500rpm to obtain regenerated oversize products and regenerated undersize products. And sieving the regenerated oversize material with a 31.5mmm sieve to obtain undersize material, namely the coarse grain regenerated aggregate. Sieving the regenerated undersize with a sieve of 2.36mm, sieving the undersize with a sieve of 1.18mm, and sieving the oversize with a sieve of 1.18mm to obtain fine regenerated aggregates.
The specific surface area of the steel slag powder is 450m2In terms of/kg. The grain diameter of the mullite powder is 300 mu m. The polyurethane prepolymer is prepared by the polymerization reaction of toluene-2, 4-diisocyanate and polypropylene glycolWhen the molar ratio of isocyanate in toluene-2, 4-diisocyanate to hydroxyl in polypropylene glycol is 2: 1. The grain diameter of the coal gangue is 1 mm. The reinforcing fiber is polyurethane fiber. The grain size of the lead-zinc tailings is 4.75 mm. The VAE emulsion has a solids content of 55% and a viscosity of 2500 mPas. The water reducing agent is a polycarboxylic acid water reducing agent.
The process for producing the roller compacted concrete of this example is the same as that of example 6.
Comparative example
Comparative example 1
The roller compacted concrete of the comparative example was prepared from the following raw materials by weight: 300.0kg of cement, 580.0kg of fine aggregate, 890.0kg of coarse aggregate, 100.0kg of steel slag powder, 8.0kg of water reducing agent and 110.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand with the grain diameter of 1.18-2.36 mm. The coarse aggregate is basalt broken stone. The particle size of the basalt broken stone is 26.5-31.5 mm. The specific surface area of the steel slag powder is 300m2In terms of/kg. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete of the comparative example comprises the following steps:
1) adding cement and steel slag powder into a stirrer, stirring for 2min, adding water, and stirring at a rotating speed of 180rpm for 2min to obtain cement slurry;
adding the coarse aggregate into cement slurry, and stirring at the rotating speed of 60rpm for 2min to obtain a premix;
2) adding fine aggregate and a water reducing agent into the premix prepared in the step 1), and stirring at the rotating speed of 30rpm for 5min to prepare a mixture;
3) transporting the mixture prepared in the step 2) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 35cm, primarily pressing once at the speed of 1.5km/h by using a vibrating compactor, secondarily pressing once at the speed of 2km/h, and finally pressing once at the speed of 4km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 30 cm;
4) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Comparative example 2
The roller compacted concrete of the comparative example was prepared from the following raw materials by weight: 300.0kg of cement, 580.0kg of fine aggregate, 890.0kg of coarse aggregate, 100.0kg of steel slag powder, 8.0kg of water reducing agent and 110.0kg of water.
Wherein the cement is PO42.5 ordinary portland cement. The fine aggregate is natural sand with the grain diameter of 1.18-2.36 mm. The coarse aggregate consists of basalt macadam and coarse regenerated aggregate according to the weight ratio of 10: 35. The particle size of the basalt broken stone is 16-19mm, and the particle size of the coarse regenerated aggregate is 26.5-31.5 mm. The coarse grain regenerated aggregate is oversize material obtained by crushing concrete waste and sieving the crushed concrete waste in a cylinder sieve at the rotating speed of 300rpm for 30 min. The specific surface area of the steel slag powder is 300m2In terms of/kg. The water reducing agent is a polycarboxylic acid water reducing agent.
The production process of the roller compacted concrete of the comparative example comprises the following steps:
1) crushing the concrete waste by using a crusher, then adding the crushed concrete waste into a cylindrical sieve, operating the cylindrical sieve at the rotating speed of 300rpm for 30min, and discharging oversize materials to obtain coarse-grained regenerated aggregates;
2) adding cement and steel slag powder into a stirrer, stirring for 2min, adding water, and stirring at a rotating speed of 180rpm for 2min to obtain cement slurry;
adding the basalt macadam and the coarse-grained regenerated aggregate into a stirrer and stirring for 5min to obtain coarse aggregate; then adding cement paste, and stirring at the rotating speed of 60rpm for 2min to obtain a premix;
3) adding fine aggregate and a water reducing agent into the premix prepared in the step 2), and stirring at the rotating speed of 30rpm for 5min to prepare a mixture;
4) transporting the mixture prepared in the step 3) to a construction area for unloading, leveling and paving by using a leveling machine, wherein the thickness of the paved layer is about 35cm, primarily pressing once at the speed of 1.5km/h by using a vibrating compactor, secondarily pressing once at the speed of 2km/h, and finally pressing once at the speed of 4km/h to obtain a compacted concrete layer, wherein the thickness of the compacted concrete layer is 30 cm;
5) paving a layer of cement mortar on the compacted concrete layer which is rolled; and repeating the operation in the step 4) until the construction of all the compacted concrete layers is completed.
Performance test
The roller compacted concrete in examples 1-10 and comparative examples 1-2 was taken, the crack condition on the concrete surface was observed and measured, the compressive strength of the roller compacted concrete was measured according to GB/T50081-2002 Standard for testing mechanical Properties of general concrete, and the shrinkage of the concrete was measured, and the test results are shown in Table 1.
TABLE 1 results of the Performance test of the roller compacted concretes of examples 1 to 10 and comparative examples 1 to 2
It can be seen from the combination of example 1, comparative examples 1 and 2 and table 1 that the roller compacted concrete is formed by mixing flux limestone, coarse recycled aggregate and sandstone crushed stone to form coarse aggregate, so that the later strength of the concrete can be improved, and the number of cracks can be reduced.
The application has the advantages of high later strength of the roller compacted concrete, difficulty in crack generation and low shrinkage rate.
Claims (10)
1. The roller compacted concrete is characterized by being mainly prepared from the following raw materials in parts by weight: cement 300-320 parts, fine aggregate 580-625 parts, coarse aggregate 890-950 parts, steel slag powder 100-125 parts, water reducing agent 8-15 parts, and water 110-125 parts; the coarse aggregate is composed of flux limestone macadam, coarse-grained regenerative aggregate and sandstone macadam in a weight ratio of 10-15:35-50:20-30, and the coarse-grained regenerative aggregate is made of construction waste.
2. The roller compacted concrete according to claim 1, which is mainly prepared from the following raw materials in parts by weight: 320 parts of cement, 605 parts of fine aggregate, 625 parts of coarse aggregate, 920 parts of coarse aggregate, 125 parts of steel slag powder, 10-15 parts of water reducing agent and 125 parts of water; the coarse aggregate is composed of flux limestone macadam, coarse-grained regenerative aggregate and sandstone macadam in a weight ratio of 10-15:40-50:25-30, and the coarse-grained regenerative aggregate is made of construction waste.
3. The roller compacted concrete according to claim 1, wherein the ratio of the particle sizes of the flux limestone macadam, the coarse recycled aggregate and the sandstone macadam is 16-19:26.5-31.5: 19-26.5.
4. The roller compacted concrete according to claim 1, wherein the coarse recycled aggregate is obtained by crushing, impurity removal, rounding and classification of construction waste; the construction waste is at least one of concrete waste and clay brick waste.
5. The roller compacted concrete according to claim 4, wherein the construction waste consists of concrete waste and clay brick waste in a weight ratio of 4-5: 1.
6. The roller compacted concrete according to claim 1, wherein the raw material further comprises 45-65 parts by weight of mullite powder.
7. The roller compacted concrete according to claim 1, wherein the raw material further comprises 10-18 parts by weight of lead-zinc tailings.
8. A process for the production of roller compacted concrete according to claim 1, comprising the steps of:
1) uniformly mixing cement, steel slag powder and water to prepare cement slurry;
uniformly mixing the coarse aggregate and cement paste to prepare premix;
2) and (3) uniformly mixing the premix, the fine aggregate and the water reducing agent to obtain the water reducing agent.
9. The process for producing roller compacted concrete according to claim 8, wherein the step 1) of uniformly mixing the coarse aggregate with the cement slurry comprises the steps of dry-mixing the flux limestone macadam, the coarse recycled aggregate and the sandstone macadam uniformly, and then uniformly mixing the mixture with the cement slurry.
10. The process for producing roller compacted concrete according to claim 9, wherein coarse reclaimed aggregate is produced by a method comprising the steps of: crushing the construction waste, then sieving for 20-30min in a cylindrical sieve at the rotating speed of 300-500rpm, and taking oversize materials to sieve, thus obtaining the coarse grain regenerated aggregate.
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| CN110963767A (en) * | 2019-12-31 | 2020-04-07 | 上海星欣科技发展有限公司 | Roller compacted concrete and preparation method thereof |
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