CN112479638A - Coral aggregate particle base layer or cushion layer material and preparation method thereof - Google Patents
Coral aggregate particle base layer or cushion layer material and preparation method thereof Download PDFInfo
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- CN112479638A CN112479638A CN202011263173.4A CN202011263173A CN112479638A CN 112479638 A CN112479638 A CN 112479638A CN 202011263173 A CN202011263173 A CN 202011263173A CN 112479638 A CN112479638 A CN 112479638A
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- 235000014653 Carica parviflora Nutrition 0.000 title claims abstract description 95
- 239000000463 material Substances 0.000 title claims abstract description 81
- 239000002245 particle Substances 0.000 title claims description 61
- 238000002360 preparation method Methods 0.000 title abstract description 12
- 244000132059 Carica parviflora Species 0.000 title description 2
- 241000243321 Cnidaria Species 0.000 claims abstract description 93
- 239000008187 granular material Substances 0.000 claims abstract description 60
- 239000004568 cement Substances 0.000 claims abstract description 45
- 239000002893 slag Substances 0.000 claims abstract description 44
- 239000013535 sea water Substances 0.000 claims abstract description 32
- 238000010276 construction Methods 0.000 claims abstract description 30
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 238000002156 mixing Methods 0.000 claims abstract description 22
- 239000004576 sand Substances 0.000 claims abstract description 19
- 239000004567 concrete Substances 0.000 claims abstract description 18
- 239000002699 waste material Substances 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 13
- 239000010959 steel Substances 0.000 claims abstract description 13
- 239000000203 mixture Substances 0.000 claims abstract description 12
- 239000002994 raw material Substances 0.000 claims abstract description 8
- 238000004056 waste incineration Methods 0.000 claims abstract description 8
- 229910021653 sulphate ion Inorganic materials 0.000 claims abstract description 4
- -1 sulphate aluminate Chemical class 0.000 claims abstract description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 67
- 238000012360 testing method Methods 0.000 claims description 25
- 239000008188 pellet Substances 0.000 claims description 18
- 239000004575 stone Substances 0.000 claims description 10
- 238000005056 compaction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 8
- 239000000758 substrate Substances 0.000 claims 5
- 238000005452 bending Methods 0.000 abstract description 12
- 230000007797 corrosion Effects 0.000 abstract description 10
- 238000005260 corrosion Methods 0.000 abstract description 10
- 230000008901 benefit Effects 0.000 abstract description 7
- 230000036571 hydration Effects 0.000 abstract description 3
- 238000006703 hydration reaction Methods 0.000 abstract description 3
- 239000012615 aggregate Substances 0.000 description 70
- 239000011398 Portland cement Substances 0.000 description 16
- 230000000087 stabilizing effect Effects 0.000 description 14
- 230000000052 comparative effect Effects 0.000 description 8
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 7
- 239000002910 solid waste Substances 0.000 description 6
- 239000010813 municipal solid waste Substances 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 229910052749 magnesium Inorganic materials 0.000 description 2
- 239000011777 magnesium Substances 0.000 description 2
- 229910021532 Calcite Inorganic materials 0.000 description 1
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- VTYYLEPIZMXCLO-UHFFFAOYSA-L calcium carbonate Substances [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 239000011362 coarse particle Substances 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 239000010791 domestic waste Substances 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 239000010438 granite Substances 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 238000003908 quality control method Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 239000003469 silicate cement Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000007655 standard test method Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000010998 test method 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
- B28C5/006—Methods for mixing involving mechanical aspects
-
- 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
- C04B28/08—Slag cements
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C3/00—Foundations for pavings
- E01C3/003—Foundations for pavings characterised by material or composition used, e.g. waste or recycled material
-
- 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
- C04B2111/20—Resistance against chemical, physical or biological attack
- C04B2111/24—Sea water resistance
-
- 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
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Structural Engineering (AREA)
- Ceramic Engineering (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- Road Paving Structures (AREA)
Abstract
The invention discloses a coral aggregate granule base layer or cushion layer material and a preparation method thereof. The raw materials comprise cement, granules and seawater, wherein the cement is slag sulphate aluminate cement or marine engineering cement; the granules comprise coral aggregate granules and one or more of steel slag fine sand, waste concrete and waste incineration slag. The invention has the advantages of local materials, low cost, strong seawater corrosion resistance, high bending tensile strength, high crack resistance, high impermeability, low early hydration heat and short construction period, and is suitable for being used as a pavement base layer or a cushion layer material. The invention adopts a vibration stirring mode for mixing, the mixture is uniform, and the invention can be applied to the construction of pavement base layers or cushion layer projects such as runways, roads, ports and wharfs on the reefs.
Description
Technical Field
The invention relates to the technical field of road engineering materials, in particular to a coral aggregate granule base layer or cushion layer material and a preparation method thereof.
Background
In the construction of the offshore island, the traditional construction materials are adopted, so that the transportation period is long, the transportation cost is high, and the economic benefit is poor. In order to accelerate the construction of the island reef in the open sea, broken coral can be used as a building material, so that the local material utilization rate is improved. In the prior art, the general silicon cement stabilized coral sand is used as a road base layer or a cushion layer material, so that local material utilization rate is improved, but seawater has a strong corrosion effect on hardened common silicate cement due to the special natural environment of the marine island reef, and the durability of road engineering is not facilitated. Meanwhile, the solid wastes on the island are not consumed in the prior art, even the broken stones need to be transported from inland, and the environmental protection benefit and the economic benefit are very low. Because the coral sand stone is difficult to screen, the internal pores are large, the coral sand stone has larger water absorption, and the difficulty of production and quality control of the cement-stabilized coral aggregate base layer is larger than that of a common sand stone water-stabilized layer. Therefore, a large amount of experimental research and theoretical analysis are needed to improve the seawater corrosion resistance of the road base material, and simultaneously, the mechanical properties of the material and the like are also needed to be ensured under the condition of reducing the construction difficulty.
Disclosure of Invention
The invention aims to provide a coral aggregate granule base layer or cushion layer material and a preparation method thereof, the material has the performance of a common Portland cement stabilized coral aggregate granule base layer material, the seawater corrosion resistance and the bending strength of the base layer or cushion layer material are improved, the service life of a road base layer or cushion layer is greatly prolonged, the construction difficulty is reduced, meanwhile, a large amount of solid wastes are absorbed in the granules, the mix proportion design difficulty is further improved, the material is green and environment-friendly, and the material can be particularly applied to road surface engineering construction of runways, highways, port wharves and the like on island reefs.
The above purpose of the invention is realized by the following technical scheme:
according to one aspect of the invention, the invention provides a coral aggregate granule base layer or cushion layer material, which comprises raw materials of cement, granules and seawater, wherein the cement is slag sulphate aluminate cement or marine cement; the granules comprise coral aggregate granules and one or more of steel slag fine sand, waste concrete and waste incineration slag.
Preferably, the grain size of the steel slag fine sand is not more than 4.75 mm; the coral aggregate particles are natural-graded coral sand-stone mixture after the island reef with the diameter of 0-20 mm is subjected to on-site crushing treatment and natural-graded coral sand-stone mixture after the island reef with the diameter of 0-45 mm is subjected to on-site crushing treatment; the particle size of the waste concrete and the waste incineration slag is 0 mm-31.5 mm.
Preferably, the granules are in the form of granules after crushing, with a maximum particle size of 45 mm; the gradation of the pellets was: the mass ratio of the particle diameters of 0 mm-4.75 mm, 4.75 mm-31.5 mm and 31.5 mm-45 mm is (30-45): (40-60): (5-30).
Preferably, the pellets comprise, in parts by weight:
preferably, the amount of water used for construction of seawater in the raw materials may be specifically determined according to the water-containing quality of the coral aggregate particles and the optimal water-containing quality of the base layer or mat. Further preferably, in the raw materials, the mass ratio of cement, aggregates and seawater is (4-10): (75-88): (8-15).
According to another aspect of the invention, the invention provides a preparation method of a coral aggregate granule base layer or cushion layer material, which comprises the following steps:
determining the composition of the granules;
mixing the cement and the aggregates, and uniformly stirring by adopting a vibration stirrer in a vibration mode;
adding seawater, and uniformly stirring by adopting a vibration stirrer to obtain the coral aggregate particle base layer or cushion layer material.
Further, the step of determining the composition of the granules comprises:
determining the granule components;
measuring the particle size of each granule component;
and determining the proportion of each component in the granules (namely the specific value of the component) according to the proportion range of each component and the gradation of the mixed granules.
Furthermore, in the two times of vibration stirring, the stirring linear speed can be 1.2-1.8 m/s, the vibration intensity can be 5-13, and the amplitude can be 0.8-1.5 mm.
Further, the cement and the aggregate are mixed, and the vibration stirring time is 100-140 s, specifically 120 s. The vibration stirring time is 160-200 s after the seawater is added, and specifically can be 180 s.
Preferably, the construction water consumption of the seawater is determined according to the water content quality of the coral aggregate granules and the optimal water content quality of the base layer or the bedding layer.
Further, the step of determining the construction water consumption of the seawater according to the water content of the coral aggregate particles and the optimal water content of the base layer or the cushion layer specifically comprises the following steps:
measuring the water content quality of the coral aggregate granules;
determining the optimal water-containing quality of the base layer or the cushion layer through a compaction test;
calculating the difference between the optimal water content quality of the base layer or the cushion layer and the water content quality of the coral aggregate granules;
if the difference is positive, taking the difference as the construction water consumption of the seawater;
and if the difference is negative, airing the coral granule coral aggregate, measuring the water content quality of the coral granule coral aggregate again, calculating the difference between the optimal water content quality and the optimal water content quality of the base layer until the difference is positive, and taking the difference as the construction water consumption of the seawater.
Compared with the prior art, the invention has the following advantages and beneficial effects:
in the island reef construction process, coral aggregates generated by hydraulic filling are in a sand-stone mixed state, and are difficult to be finely screened in engineering application like common aggregates, and in combination with the practical engineering application condition, the coral aggregates are only coarsely screened into 0-20 mm and 0-45 mm, the granules are firstly graded and designed, and then the suitable grading proportion is obtained through a large amount of tests. Meanwhile, the conditions that the water absorption of the coral aggregate particles is high and the water consumption of concrete is low are fully considered, and the stirring is carried out by adopting the vibration stirrer, so that the stirring time can be further shortened, the stirring uniformity of the material is ensured, and the compaction quality of the material is improved.
The invention adopts seawater corrosion resistant cement, granules and seawater as raw materials, optimizes the composition, the particle size and the like of the granules, ensures that the material has the performance of the base material of the common portland cement stabilized coral aggregate granules, improves the seawater corrosion resistance, the bending tensile strength and the bending tensile strength of the base layer or the cushion layer material, greatly prolongs the service life of the pavement base layer or the cushion layer, and is particularly applicable to the engineering construction of the pavement base layer or the cushion layer of runways, highways, ports and wharfs on the reefs and the like.
The advantages and the beneficial effects of the invention are embodied in the following aspects:
(1) the engineering problem that the coral aggregates are difficult to be finely screened and graded as common aggregates is solved, and the coral aggregates are used as pavement base layers and cushion materials in actual engineering on a large scale;
(2) the slag sulphoaluminate cement or the marine cement is adopted, so that the seawater corrosion resistance of the material is further enhanced, and the sulfate corrosion resistance coefficient is more than 1.0;
(3) the coral aggregate, the waste concrete and the waste incineration slag are adopted as raw materials, so that the local material taking rate is high, the fine steel slag sand in a near-shore area can be consumed, a large amount of solid waste on an island or near-shore area can be consumed, the energy is saved, and the environment is protected;
(4) under the condition of the same strength grade, the bending and tensile strength of the base layer prepared by adopting the slag sulphoaluminate cement is about 50 percent higher than that of a stable base layer of the common Portland cement;
(5) the base layer or cushion layer material prepared by the slag sulphoaluminate cement has strong acid corrosion resistance and can be used in an acid environment with the pH value of more than 3.0;
(6) the vibration stirring mode is adopted for mixing, so that the problem that the base material is difficult to be uniformly mixed is solved;
(7) the early hydration heat of the adopted sulphoaluminate cement or marine cement is low, and the crack resistance is obviously higher than that of a common Portland cement stable base layer.
Detailed Description
The technical solution of the present invention is described below with reference to the following examples, but the invention is not limited to the examples.
In the following examples, the coral aggregate particles are coral sand stones generated in the island reclamation construction process, and the main chemical component is CaCO3And contains a certain amount of high-magnesium calcite (Ca, Mg) CO3The particle sizes of the coarse particles are 0 mm-20 mm and 0 mm-45 mm through coarse screening. The steel slag fine sand is fine sand meeting the requirement of road engineering sand after stabilizing and magnetically separating iron from converter steel slag or electric furnace steel slag, and the particle size of the fine sand is not more than 4.75 mm. The waste concrete is recycled as recycled aggregate on the island, and needs to be crushed, and the particle size of the crushed waste concrete is smaller than 31.5 mm. The waste incineration slag is slag obtained by incinerating domestic waste on the island, meets the national standard of harmless solid waste, and has a particle size of less than 31.5 mm. In the implementation process, the coral aggregate particles, the waste concrete and the garbage incineration slag are firstly measured to be 0 mm-4.75 mmmm, 4.75 mm-31.5 mm, 31.5 mm-45 mm, according to the requirements of the composition of the granules in the range of the ratio of each component in the granules and the gradation of the granules after mixing, the required granules are obtained by mixing the selected components. The three types of granules except the coral aggregate granules are all solid wastes, so that the cost is low, and the waste concrete and the waste incineration slag are both locally obtained on the island, so that the cost is further reduced; meanwhile, the cement adopted by the invention can make up the strength deficiency of the three kinds of granules compared with granite.
The method for determining the optimal water content quality through compaction tests can refer to JTG-E51-2009 test Specification for inorganic binder stable materials for highway engineering to determine, specifically comprises the steps of selecting 5 water contents, carrying out compaction tests, compacting for five layers, compacting 27 times each time, determining five water contents and dry density after drying, drawing a scatter diagram by taking the water contents as horizontal coordinates and the dry density as vertical coordinates, drawing a curve to fit the scatter diagram, taking the coordinates corresponding to the highest point as the maximum dry density and the optimal water content, and calculating according to the optimal water contents and the material consumption to obtain the optimal water content of the material.
Example one
A coral aggregate pellet base material comprising: 4 percent of slag sulphoaluminate cement, 30.5 percent of coral aggregate particles with the particle size of 0mm to 20mm, 10.6 percent of coral aggregate particles with the particle size of 0mm to 45mm, 20 percent of steel slag fine sand, 20 percent of waste concrete and 14.9 percent of seawater. The final gradation after mixing of the four pellets was: the mass ratio of the particle diameters of 0 mm-4.75 mm, 4.75 mm-31.5 mm and 31.5 mm-45 mm is 40: 50: 10.
the preparation method of the base material comprises the following steps:
(1) measuring the water content of the coral aggregate particles to be 10.5%, and calculating the water content of the coral aggregate particles to be 4.3% according to the mass of the coral aggregate particles;
(2) determining the optimal water content of the base layer to be 19.2% through a compaction test;
(3) the water content of the coral aggregate granules is subtracted from the optimal water content of the base layer to obtain the construction water consumption of 14.9 percent;
(4) taking the slag sulphoaluminate cement and the coral aggregate granules, and uniformly mixing by vibration; wherein the vibration intensity is 10, and the amplitude is 1.5 mm; the stirring line speed was 1.5m/s and the stirring time was 120 s.
(5) Adding construction water consumption, and uniformly mixing by vibration to obtain a base layer material; wherein the vibration intensity is 10, and the amplitude is 1.5 mm; the stirring line speed was 1.5m/s and the stirring time was 180 s.
Example two
A coral aggregate pellet base or subbase material comprising: 6 percent of slag sulphoaluminate cement, 21.4 percent of coral aggregate particles with the particle size of 0mm to 20mm, 34.1 percent of coral aggregate particles with the particle size of 0mm to 45mm, 20 percent of waste concrete, 10 percent of garbage incineration slag and 8.5 percent of seawater. The final gradation of the four pellets was: the mass ratio of the particle diameters of 0 mm-4.75 mm, 4.75 mm-31.5 mm and 31.5 mm-45 mm is 35: 45: 20.
the preparation method of the base material comprises the following steps:
(1) measuring the water content of the coral aggregate granules to be 14.2%, and calculating the water content of the coral aggregate granules to be 7.9% according to the mass of the coral aggregate granules;
(2) determining the optimal water content of the base layer to be 16.4% through a compaction test;
(3) subtracting the water content of the coral aggregate granules from the optimal water content of the base layer to obtain the construction water consumption of 8.5 percent;
(4) taking the slag sulphoaluminate cement and the coral aggregate granules, and uniformly mixing by vibration; wherein the vibration intensity is 12, and the amplitude is 0.8 mm; the stirring line speed was 1.7m/s and the stirring time was 100 s.
(5) Adding construction water consumption, and uniformly mixing by vibration to obtain a base layer or a cushion layer material; wherein the vibration intensity is 12, and the amplitude is 0.8 mm; the stirring line speed was 1.7m/s and the stirring time was 165 s.
EXAMPLE III
A cement stabilized base material comprising: 9 percent of marine cement, 13.8 percent of coral aggregate particles with the particle size of 0mm to 20mm, 31.3 percent of coral aggregate particles with the particle size of 0mm to 45mm, 10 percent of steel slag fine sand, 20 percent of waste concrete, 5 percent of garbage incineration slag and 10.9 percent of seawater. The final gradation of the four pellets was: the mass ratio of the particle diameters of 0 mm-4.75 mm, 4.75 mm-31.5 mm and 31.5 mm-45 mm is 30: 55: 15.
the preparation method of the base material comprises the following steps:
(1) measuring the water content of the coral aggregate granules to be 8.9%, and calculating the water content of the coral aggregate granules to be 4.0% according to the mass of the coral aggregate granules;
(2) determining the optimal water content of the base layer to be 15.9% through a compaction test;
(3) the water content of the coral aggregate granules is subtracted from the optimal water content of the base layer to obtain 10.9 percent of construction water;
(4) mixing the slag sulphoaluminate cement and the coral aggregate granules, vibrating and uniformly mixing; wherein the vibration intensity is 8, and the amplitude is 1.1 mm; the stirring line speed was 1.2m/s and the stirring time was 130 s.
(5) Adding construction water consumption, and uniformly mixing by vibration to obtain a base material; wherein the vibration intensity is 8, and the amplitude is 1.1 mm; the stirring speed linear rate is 1.2m/s, and the stirring time is 200 s.
In the above examples, the first and second examples are slag sulfoaluminate cement stabilizing materials, the third example is a marine engineering cement stabilizing material, and the first four to third comparative examples are carried out for comparison with ordinary portland cement under the same conditions.
Comparative example 1
A portland cement stabilization underlayment material comprising: 4 percent of ordinary portland cement, 30.5 percent of coral aggregate particles with the particle size of 0 mm-20 mm, 10.6 percent of coral aggregate particles with the particle size of 0 mm-45 mm, 20 percent of steel slag fine sand, 20 percent of waste concrete and 14.9 percent of seawater.
The preparation method of the base material comprises the following steps:
(1) taking the ordinary portland cement and the coral aggregate particles, and uniformly mixing by vibration;
(2) adding construction water consumption, and vibrating and mixing uniformly to obtain the base layer material.
Comparative example No. two
A general silicate coral aggregate pellet based or subbase material comprising: 6 percent of ordinary portland cement, 21.4 percent of coral aggregate particles with the particle size of 0 mm-20 mm, 34.1 percent of coral aggregate particles with the particle size of 0 mm-45 mm, 20 percent of waste concrete, 10 percent of garbage incineration slag and 8.5 percent of seawater.
The preparation method of the base material comprises the following steps:
(1) taking the ordinary portland cement and the coral aggregate particles, and uniformly mixing by vibration;
(2) adding construction water consumption, and vibrating and uniformly mixing to obtain the base layer or the cushion layer material.
Comparative example No. three
A portland cement stabilized base material, comprising: 9 percent of ordinary portland cement, 13.8 percent of coral aggregate particles with the particle size of 0 mm-20 mm, 31.3 percent of coral aggregate particles with the particle size of 0 mm-45 mm, 10 percent of steel slag fine sand, 20 percent of waste concrete, 5 percent of garbage incineration slag and 10.9 percent of seawater.
The preparation method of the base material comprises the following steps:
(1) taking the ordinary portland cement and the coral aggregate particles, and uniformly mixing by vibration;
(2) adding construction water consumption, and uniformly mixing by vibration to obtain the base material.
The unconfined compressive strength, the bending tensile strength and the unconfined compressive strength and the bending tensile strength after the sulfate dry-wet cycle of the examples and the comparative examples are respectively tested, and the test is as follows:
(1) test method
And (3) carrying out 7-day-age unconfined compression strength and bending tensile strength tests by referring to JTG-E51-2009 Standard of Highway engineering inorganic binder stabilizing material test regulations. Wherein, the testing of the unconfined compressive strength is to form a cylindrical test piece with the diameter height multiplied by the diameter of 100mm multiplied by 100mm by the cement-stabilized coral aggregate material indoors; the flexural tensile strength test is to form the cement-stabilized coral aggregate material into rectangular test pieces of 100mm × 100mm × 400mm indoors.
According to the test piece forming method, after the test piece is maintained in a maintenance room with the temperature of 20 +/-2 ℃ and the humidity of more than 95% for 28 days, sulfate dry-wet cycle tests are carried out according to G coral aggregate base layer or cushion layer material T50082-2009 Standard test method for testing long-term performance and durability of ordinary concrete, and the cycle times are 30 times.
(2) Test results
The test results of 7d unconfined compressive strength and flexural tensile strength are shown in table 1, and the test results of sulfate dry-wet cycle are shown in table 2.
TABLE 1 indoor Cement stabilizing Material sample 7d unconfined compressive Strength and flexural tensile Strength test results
As can be seen from Table 1, the strength of each mixing ratio meets the strength requirements of the base course and the subbase course specified in detail rules of Highway pavement base course construction technology 4.2.4. The 7d unconfined compressive strength of different cement stabilizing materials with the same proportion is equivalent, but the 7d bending tensile strength of the slag sulphoaluminate cement stabilizing material is obviously higher than that of the corresponding ordinary Portland cement stabilizing material. Particularly, the high-grade road has higher requirements on the bending and tensile strength of the material, so that the slag sulphoaluminate cement is more suitable for being used as a road base layer or a base layer stabilizing material.
TABLE 2 indoor cement stabilized material sample sulphate dry-wet cycle 30 times, unconfined compressive strength and bending tensile strength test results
| Examples | Unconfined compressive strength/MPa | Flexural tensile strength/MPa |
| Example one | 4.1 | 0.73 |
| Example two | 5.3 | 1.16 |
| EXAMPLE III | 7.5 | 1.21 |
| Comparative example 1 | 3.0 | 0.38 |
| Comparative example No. two | 4.1 | 0.70 |
| Comparative example No. three | 5.1 | 0.89 |
As can be seen from Table 2, after 30 times of sulfate dry-wet cycles, the unconfined compressive strength and flexural tensile strength of the slag sulfoaluminate cement and marine cement stabilizing material are obviously higher than those of the ordinary portland cement stabilizing material, and as can be seen from Table 1 and Table 2, after 30 times of sulfate dry-wet cycles, the unconfined compressive strength and flexural tensile strength of the slag sulfoaluminate cement and marine cement stabilizing material have an increasing trend relative to those before the cycles, while the strength of the ordinary portland cement stabilizing material has a decreasing trend. Therefore, in a marine corrosive environment, the slag sulphoaluminate and the marine cement are more suitable for being used as a road base layer or a subbase layer stabilizing material.
In conclusion, the coral aggregate granule base layer or cushion layer material provided by the invention has the advantages of low cost, strong seawater corrosion resistance, high bending strength, high early strength and low early hydration heat, can greatly absorb solid wastes on or near the bank of the island, is green and environment-friendly, is suitable for being used as a road base layer or cushion layer material, and is suitable for road engineering construction of runways, highways, port wharfs and the like on the island and the island.
While the preferred embodiments of the present invention have been illustrated and described, it will be understood by those skilled in the art that the present invention is not limited to the details of the embodiments shown and described, but is capable of numerous equivalents and substitutions without departing from the spirit of the invention as set forth in the claims appended hereto.
Claims (8)
1. The coral aggregate particle base layer or cushion layer material is characterized in that raw materials comprise cement, particles and seawater, wherein the cement is slag sulphate aluminate cement or marine cement; the granules comprise coral aggregate granules and one or more of steel slag fine sand, waste concrete and waste incineration slag.
2. The coral aggregate pellet base layer or cushion layer material as claimed in claim 1, wherein the steel slag fine sand has a particle size of not more than 4.75 mm; the coral aggregate particles are natural-graded coral sand-stone mixture after the island reef with the diameter of 0-20 mm is subjected to on-site crushing treatment and natural-graded coral sand-stone mixture after the island reef with the diameter of 0-45 mm is subjected to on-site crushing treatment; the particle size of the waste concrete and the waste incineration slag is 0-31.5 mm.
3. The coral aggregate pellet base layer or cushion material of claim 1, wherein the pellets comprise, in parts by weight:
4. the coral aggregate pellet substrate or underlayment material of claim 1, wherein the grading of the pellets is: the mass ratio of the particle diameters of 0 mm-4.75 mm, 4.75 mm-31.5 mm and 31.5 mm-45 mm is (30-45): (40-60): (5-30).
5. The coral aggregate pellet base layer or cushion layer material as claimed in claim 1, wherein the raw material comprises cement, pellets and seawater in a mass ratio of (4-10): (75-88): (8-15).
6. A method of preparing a coral aggregate pellet substrate or underlayment material as set forth in claim 1, comprising:
determining the composition of the granules;
mixing the cement and the aggregates, and uniformly stirring by adopting a vibration stirrer;
adding seawater, and uniformly stirring by using a vibration stirrer to obtain the coral aggregate particle base layer or cushion layer material;
wherein the construction water consumption of the seawater is determined according to the water content quality of the coral aggregate granules and the optimal water content quality of the base layer or the cushion layer.
7. The method for preparing a coral aggregate pellet substrate or bedding material as claimed in claim 6, wherein said step of determining the composition of the pellets comprises:
determining the granule components;
measuring the particle size of each granule component;
and determining the proportion of each component in the granules according to the proportion range of each component and the gradation of the granules after mixing.
8. The method for preparing a coral aggregate substrate or mat layer material according to claim 6, wherein the step of determining the amount of water for construction of seawater based on the water content quality of the coral aggregate and the optimum water content quality of the substrate or mat layer comprises:
measuring the water content quality of the coral aggregate granules;
determining the optimal water-containing quality of the base layer or the cushion layer through a compaction test;
calculating the difference between the optimal water content quality of the base layer or the cushion layer and the water content quality of the coral aggregate granules;
if the difference is positive, taking the difference as the construction water consumption of the seawater;
and if the difference is negative, airing the coral aggregate particles, measuring the water content quality of the coral aggregate particles again, calculating the difference between the optimal water content quality and the optimal water content quality of the base layer until the difference is positive, and then taking the difference as the construction water consumption of the seawater.
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