CN111777365A - Proportioning method of super-large-volume fly ash cement stable base material and vibration stirrer - Google Patents
Proportioning method of super-large-volume fly ash cement stable base material and vibration stirrer Download PDFInfo
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- 239000004568 cement Substances 0.000 title claims abstract description 307
- 239000000463 material Substances 0.000 title claims abstract description 255
- 239000010881 fly ash Substances 0.000 title claims abstract description 135
- 238000000034 method Methods 0.000 title claims abstract description 68
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 185
- 238000002156 mixing Methods 0.000 claims abstract description 122
- 238000003756 stirring Methods 0.000 claims abstract description 94
- 238000012360 testing method Methods 0.000 claims abstract description 66
- 230000006641 stabilisation Effects 0.000 claims abstract description 39
- 238000011105 stabilization Methods 0.000 claims abstract description 39
- 229920005646 polycarboxylate Polymers 0.000 claims abstract description 10
- 239000002131 composite material Substances 0.000 claims abstract description 9
- 238000005406 washing Methods 0.000 claims description 66
- 238000001035 drying Methods 0.000 claims description 50
- 239000002245 particle Substances 0.000 claims description 34
- 230000005540 biological transmission Effects 0.000 claims description 32
- 210000003298 dental enamel Anatomy 0.000 claims description 28
- 238000005056 compaction Methods 0.000 claims description 26
- 239000003638 chemical reducing agent Substances 0.000 claims description 19
- 239000002994 raw material Substances 0.000 claims description 16
- 239000004575 stone Substances 0.000 claims description 16
- 238000005303 weighing Methods 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 13
- 238000011049 filling Methods 0.000 claims description 12
- 239000004567 concrete Substances 0.000 claims description 9
- 239000011800 void material Substances 0.000 claims description 9
- 241000287196 Asthenes Species 0.000 claims description 8
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 239000000654 additive Substances 0.000 claims description 5
- 230000000996 additive effect Effects 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 238000004364 calculation method Methods 0.000 claims description 4
- 239000011148 porous material Substances 0.000 claims description 4
- 230000000087 stabilizing effect Effects 0.000 claims description 4
- 238000010187 selection method Methods 0.000 claims description 3
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical compound OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 abstract description 3
- 238000004448 titration Methods 0.000 abstract description 3
- 239000000203 mixture Substances 0.000 description 16
- 238000013142 basic testing Methods 0.000 description 5
- 238000005029 sieve analysis Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
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- 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
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- 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
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- B—PERFORMING OPERATIONS; TRANSPORTING
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- 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
- B28C5/48—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected by vibrations
- B28C5/485—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions wherein the mixing is effected by vibrations with reciprocating or oscillating stirrers; Stirrers therefor
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- C—CHEMISTRY; METALLURGY
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- C04B7/00—Hydraulic cements
- C04B7/24—Cements from oil shales, residues or waste other than slag
- C04B7/26—Cements from oil shales, residues or waste other than slag from raw materials containing flue dust, i.e. fly ash
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- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
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- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
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- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
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- 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
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
A method for proportioning super-large-amount fly ash cement stable base materials and a vibration stirrer. The traditional method for measuring the cement mixing amount in the cement-stabilized base material adopts an EDTA titration method. The invention comprises the following steps: selecting the grading range of the cement stabilization base material; determining the optimal mixing amount of the composite polycarboxylate high-performance admixture; determining the optimal water content and the maximum density of the unconfined compressive strength test piece; forming an unconfined compressive strength test piece according to the maximum dry density of 98% by taking the optimal water content and the corresponding maximum dry density obtained in the step three as the basis, and performing an unconfined compressive strength test; and detecting the actual water content and the mixing amount of the cement and the fly ash of the cement stabilization base material, wherein the cement stabilization base material is newly stirred with the optimal water content and the maximum dry density. The invention is used for proportioning and stirring the super-large-volume fly ash cement stable base material.
Description
The technical field is as follows:
the invention relates to a method for proportioning a super-large-volume fly ash cement stable base material and a vibration stirrer.
Background art:
the traditional method for measuring the cement mixing amount in the cement-stabilized base material adopts an EDTA titration method, and the quality detection parameters of the traditional cement-stabilized base material only measure the cement mixing amount, so that the method is very comprehensive, because the cement mixing amount is only a part of reasons for determining the quality of the cement-stabilized base material, and the 'water-cement ratio' can more comprehensively reflect the quality condition of the cement-stabilized base material.
The invention content is as follows:
the invention aims to provide a method for proportioning an ultra-large-volume fly ash cement stable base material and a vibration stirrer.
The above purpose is realized by the following technical scheme:
a method for proportioning a super-large-amount fly ash cement stable base material comprises the following steps:
the method comprises the following steps: the grading range of the cement stabilization base layer material is selected according to the principle that a framework is compact and the minimum void ratio is combined;
step two: determining the optimal mixing amount of the composite polycarboxylate high-performance admixture;
step three: stirring the cement stabilized base material by using a vibrating stirrer to perform a standard compaction test so as to determine the minimum water content and the maximum density of a test piece without lateral limit compressive strength;
step four: forming an unconfined compressive strength test piece according to the maximum dry density of 98% by taking the optimal water content and the corresponding maximum dry density obtained in the step three as the basis, and performing an unconfined compressive strength test;
step five: and detecting the actual water content and the mixing amount of the cement and the fly ash of the cement stabilization base material, wherein the cement stabilization base material is newly stirred with the optimal water content and the maximum dry density.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following specific steps: the specific process of the step one is as follows: the grading of the cement stabilized base material is based on the principle that the skeleton is compact and the minimum void ratio is combined, multistage 19mm-26.5mm particle size aggregates are used for forming a stressed system skeleton, 9.5mm-19mm particle size aggregates are used for filling the gaps, 4.75mm-9.5mm particle size aggregates are used for filling the gaps formed by 9.5mm-19mm particle size aggregates, 0mm-4.75mm particle size aggregates are used for filling the gaps formed by 9.5mm-16mm particle size aggregates, the multistage aggregate is organically bonded together by the minimum moisture content and 3.8% -4.8% of cementing materials, so that the integral pavement base cement stabilized base material is formed, and the cement stabilized base material is mainly used for bearing complex loads from pavement traffic flow.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following specific steps: firstly, a compaction test is carried out on the cement stabilization base material without adding or reducing the water reducing agent to obtain the optimal water content, the water consumption of the cement stabilization base material added with the water reducing agent is determined according to the water reducing rate of the high-performance water reducing agent, then the compaction test is carried out to further obtain the optimal water content and the maximum dry density of the cement stabilization base material added with the additive, and at the moment, the addition amount of the high-performance water reducing agent is the optimal addition amount.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following specific steps: stirring the cement stabilized base material by using a vibrating stirrer, then performing a standard compaction test, determining the minimum water content and the maximum density of a test piece without the confined compressive strength, and performing the basic principle of the standard compaction test: compacting by using three cementing material mixing amounts and three different water contents;
the specific method comprises the following steps: the vertical floating is plus or minus 0.5 percent to plus or minus 0.8 percent by taking the given cement and fly ash mixing amount as a reference, so that three different cement and fly ash mixing amounts exist, while determining the mixing amount of cement and fly ash, mixing more than II-class fly ash accounting for 50% of the total amount of the cementing material, determining the mixing amount of the composite polycarboxylate high-performance admixture through tests, selecting three different water contents with the same water required for mixing cement stabilized base materials, determining a reference water content according to the known water absorption of coarse and fine aggregates, the water consumption of standard consistence of binding materials and the like by the selection method, and then the upper and lower floating is +/-0.8% -1.2%, so that three different water contents and three different cement dosages are simultaneously available, and after the compaction tests are completed, the maximum dry density corresponding to the optimal water content can be obtained.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following concrete steps:
(1) uniformly stirring the cement stabilization base material, randomly weighing six parts with the same mass for later use, wherein three parts are used for a drying test, and calculating the water content of the cement stabilization base material after drying; the other three parts are used for a washing test, the mass of the cement and the fly ash can be calculated after washing and drying, and the mixing amount of the cement and the fly ash is further calculated by combining other known amounts;
(2) simultaneously putting any three parts of the raw materials into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying to constant weight, carefully taking out the dried raw materials and putting the dried raw materials into a dryer, cooling and weighing the raw materials to be accurate to 0.01 g;
(3) for the dried three parts of cement stabilized base material, the mass before drying is respectively set as
The mass after drying is respectively
Having an average value of
，
；
The mass of water in the three parts of cement stabilized base material is respectively set as
Then, then
、
、
；
The average mass of water in the three cement stabilized base materials is set as
Then, then
The mass units of the cement stabilized base layer material and the water in the above formulas are g, the calculation is accurate to 0.01g, and the arithmetic mean value of the mass of the water in the three cement stabilized base layer materials is used as a measured value;
(4) for the remaining three cement-stabilized base materials used for washing, the mass before washing is respectively set as
The average of the three is
；
(5) Pouring one part of cement-stabilized base material into a 0.075mm square-hole sieve, opening a water faucet opposite to the square-hole sieve, fully washing the cement-stabilized base material in the square-hole sieve by water flow, shaking the square-hole sieve while washing for about 300-400 s, taking great care in the whole washing process, strictly preventing any loss of particles with the particle size larger than 0.075mm until all cement and fly ash in the cement-stabilized base material are washed clean, and turning off the water faucet until the water flow becomes clear and transparent, and then respectively and sequentially referring to the above steps to finish a washing test on the remaining two parts of cement-stabilized base material to be washed;
(6) screening residual substances on three parts of washed cement-stabilized base material, carefully transferring the residual substances into appropriate enamel plates respectively, simultaneously putting the three enamel plates into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying the enamel plates to constant weight, carefully taking out the enamel plates, putting the enamel plates into a dryer, cooling the enamel plates, and then weighing the mass of the enamel plates to be accurate to 0.01 g;
(7) calculating the average mass of the cement and the fly ash:
in the formula:
in the formula:
(8) calculating the water content of the cement stabilized base material and the mixing amount of the cement and the fly ash
Water content of cement stabilized base material
In the formula:
cement and flyash mixing amount of cement stabilized base material
In the formula:
The proportioning method of the super-large-volume fly ash cement stable base material is characterized by comprising the following steps of: the three different water contents are respectively 3.8%, 4.8% and 4.3%.
A special vibration mixer for proportioning a super-large-volume fly ash cement stabilized base material comprises the following components: support, churn support, agitator motor and churn motor, the churn support in set up the churn, churn bottom be fixed with the churn axle, the churn axle be connected with churn rotating device, the inside (mixing) shaft that sets up of churn, the (mixing) shaft eccentric settings in the churn in, (mixing) shaft on be fixed with the stirring leaf, the (mixing) shaft be connected with (mixing) shaft rotating device.
The special vibration mixer for proportioning the ultra-large-volume fly ash cement stabilized base material is characterized in that the mixing drum rotating device comprises a mixing drum motor and a mixing drum transmission shaft, the mixing drum transmission shaft is connected with the inside of the support through a bearing, bevel gears are respectively fixed at two ends of the mixing drum transmission shaft, the bevel gear at one end of the mixing drum transmission shaft is meshed with the bevel gear on the mixing drum shaft, and the bevel gear at the other end of the mixing drum transmission shaft is meshed with the bevel gear on the mixing drum motor shaft.
The special vibration stirrer for the ultra-large-volume fly ash cement stabilized base material ratio is characterized in that the stirring shaft rotating device comprises a stirring motor, a stirring shaft transmission shaft and a stirring motor shaft, bevel gears are respectively fixed at two ends of the stirring shaft transmission shaft, the bevel gear at one end of the stirring shaft transmission shaft is meshed with the bevel gear on the stirring motor shaft, and the bevel gear at the other end of the stirring shaft transmission shaft is meshed with the bevel gear on the stirring shaft.
The special vibration mixer for proportioning the ultra-large amount of fly ash cement stabilized base material as claimed in claim 7, which is characterized in that: the stirring shaft is provided with an upper group of stirring blades and a lower group of stirring blades, the lower group is formed by uniformly arranging three stirring blades on the stirring shaft, an included angle of 120 degrees is formed between every two adjacent stirring blades, and the stirring blades of the upper group are one.
Has the advantages that:
1. the cement stabilized base material is classified into the ultra-lean concrete category, the cement is equivalently replaced by the application of the super-large amount of fly ash, more than or equal to 50 percent of class II fly ash (equal amount of ground slag powder or other siliceous mineral admixtures can also be added) and the composite polycarboxylate high-performance admixture (the water reducing agent, the retarder, the air entraining agent, the expanding agent or the shrinkage reducing agent, the slump retaining agent and the like are compounded) are added into the cement stabilized base material, so that the cement stabilized base material is green and environment-friendly, the cost of the mixing proportion is reduced, and the economic benefit is remarkable. The unconfined compressive strength of the mixture in 7 days is close to the original mixing ratio, the unconfined compressive strength of the mixture in 7 days in the original mixing ratio reaches 4.5-5.9 MPa, and the unconfined compressive strength of the mixture in 7 days in the mixing ratio reaches 4.1-5.2 MPa. The unconfined compressive strength is more than or equal to the original mixing ratio in 60 days, the unconfined compressive strength reaches 5.5-6.9 MPa in the original mixing ratio in 60 days, and the unconfined compressive strength reaches 5.6-7.2 MPa in the mixing ratio in 60 days. The unconfined compressive strength of the two ages of the invention completely meets the requirements of design and specification.
In the design stage of the composition of the mixture ratio (including compaction test and manufacturing of unconfined compressive strength test piece), the cement stabilized base material is stirred by adopting a mechanical vibration method, so that the traditional manual stirring mode is replaced.
The design of the composition of the cement stabilized base material refers to the design concept of the mix proportion of cement concrete, namely, on the premise of meeting the maximum compactness of the cement stabilized base material, the minimum water consumption (the optimal water content) is adopted, and the optimal water content is far less than the optimal water content of the traditional mix proportion because a high-performance water reducing agent is added. A large number of tests prove that: under the premise of the same mixing amount of the cementing materials, the unconfined compressive strength of the cement stabilized base material can be greatly improved, and the following properties of the cement stabilized base material can be improved or improved: indirect tensile strength, bending strength, indoor compression resilience modulus, indoor dynamic compression resilience modulus, splitting resilience modulus, bending resilience modulus, drying shrinkage performance, temperature shrinkage performance, water seepage performance, freeze thawing performance, scouring resistance and the like.
The method for determining the mineral material grading comprises the following steps: a skeleton compact grading method is combined with a minimum void ratio double-control method to serve as a unique standard for determining the grading, and a traditional method that a recommended grading median must be selected is abandoned.
The invention abandons the traditional method of measuring the cement mixing amount in the cement stabilized base material by using an EDTA titration method and changes the innovative method of measuring the cement and fly ash mixing amount by using a water washing method. And meanwhile, the drying method is used for measuring the water content in the cement stabilized base material, so that the method is accurate and rapid, and the detection cost can be saved. The cement (fly ash) doping amount and the water content of the construction cement stabilized base material measured in real time can be compared with the cement (fly ash) doping amount and the optimal water content obtained by compaction in a laboratory, so that the reason for causing deviation can be conveniently found, the deviation can be corrected in time, and the engineering quality can be ensured. The method is equivalent to the detection of the actual 'water-cement ratio' of the concrete, which is equivalent to the detection of the actual 'water-cement ratio' of the cement stabilization base material, and the 'water-cement ratio' is a very important parameter for determining the unconfined compressive strength, other mechanical indexes and durability of the cement stabilization base material, and can more comprehensively reflect the quality condition of the cement stabilization base material.
The allowable delay time of the cement stabilized base material can be flexibly controlled (controlled by the retarder), so that the material selection and the application range of the cement are expanded.
The vibration stirrer provided by the invention rotates in two directions, and the stirring shaft rotates while the stirring barrel rotates, so that the working efficiency is improved, the stirring uniformity of the mixture is increased, and cement and other cementing materials can be saved.
Description of the drawings:
FIG. 1 is a schematic structural view of a vibratory blender of the present invention;
FIG. 2 is a top view of the vibratory blender;
FIG. 3 is a front view of the vibratory blender;
in the figure: 1. a transmission shaft of the stirring shaft; 2. a support; 3. a stirring motor; 4. a mixing drum motor; 5. a mixing drum motor shaft; 6. a stirring cylinder transmission shaft; 7. a stirring shaft; 8. stirring blades; 9. a mixing drum; 10. a mixing drum support; 11. a mixing drum shaft; 12. stirring motor shaft.
The specific implementation mode is as follows:
example 1:
a method for proportioning a super-large-amount fly ash cement stable base material comprises the following steps:
the method comprises the following steps: the grading range of the cement stabilization base layer material is selected according to the principle that a framework is compact and the minimum void ratio is combined;
step two: determining the optimal mixing amount of the high-performance polycarboxylate admixture;
step three: stirring the cement stabilized base material by using a vibrating stirrer to perform a standard compaction test so as to determine the optimal water content and the maximum density of a test piece without lateral limit compressive strength;
step four: forming an unconfined compressive strength test piece according to the maximum dry density of 98% by taking the optimal water content and the corresponding maximum dry density obtained in the step three as the basis, and performing an unconfined compressive strength test;
step five: and detecting the actual water content and the mixing amount of the cement and the fly ash of the cement stabilization base material, wherein the cement stabilization base material is newly stirred with the optimal water content and the maximum dry density.
Example 2:
according to the proportioning method of the ultra-large amount of fly ash cement stable base material in the embodiment 1, the specific process of the first step is as follows: the grading of the cement stabilized base material is based on the principle that a skeleton is compact and the minimum void ratio is combined, multistage 19mm-26.5mm particle size aggregates are used for forming a stressed system skeleton, 9.5mm-19mm particle size aggregates are used for filling the gaps, 4.75mm-9.5mm particle size aggregates are used for filling the gaps formed by 9.5mm-19mm particle size aggregates, 0mm-4.75mm particle size aggregates are used for filling the gaps formed by 9.5mm-16mm particle size aggregates, the multistage distribution aggregates are organically bonded together by the minimum water content and 3.8% -4.8% of cementing material mixing amount (cement and fly ash) to form an integral pavement base cement stabilized base material, and the integral pavement base material mainly bears complex loads from pavement traffic flow.
Example 3:
according to the proportioning method of the ultra-large amount of blended fly ash cement stable base material in the embodiment 1 or 2, the specific process of the second step is as follows: firstly, performing a compaction test on a cement stabilization base material without adding or reducing a water reducing agent to obtain the optimal water content, determining the water consumption of the cement stabilization base material added with the water reducing agent according to the water reducing rate of the high-performance water reducing agent, then performing the compaction test to further obtain the optimal water content and the maximum dry density of the cement stabilization base material added with the additive, wherein the adding amount of the high-performance water reducing agent is the optimal adding amount, and the optimal adding amount is 0.6-1.2%.
Example 4:
the proportioning method of the ultra-large amount of fly ash cement stabilized base material according to the embodiment 1, 2 or 3, the concrete process of the third step is as follows: the method comprises the following steps of stirring a cement stabilized base material by using a vibrating stirrer to perform a standard compaction test, determining the optimal water content and the maximum density of a test piece without lateral limit compressive strength, and performing a basic principle of the standard compaction test: compacting by using three cement and fly ash mixing amounts and three different water contents;
the specific method comprises the following steps: the method comprises the steps of determining the doping amount of cement and fly ash, doping more than II-class fly ash accounting for 50% of the total amount of a cementing material, determining a composite polycarboxylate high-performance additive by experiments, mixing cement and fly ash, selecting three different water contents according to the water absorption of a measured coarse-fine aggregate, the standard consistency water consumption of a binding material and other known amounts, determining a reference water content, and then floating up to +/-0.8% -1.2%, so that three different water contents and three different cement using amounts are obtained, and obtaining the maximum dry density corresponding to the optimal water content after compaction experiments.
Example 5:
the proportioning method of the ultra-large blended fly ash cement stabilized base material according to the embodiment 1, 2, 3 or 4, the concrete process of the fifth step is as follows:
(1) uniformly stirring the cement stabilization base material, randomly weighing six parts with the same mass for later use, wherein three parts are used for a drying test, and calculating the water content of the cement stabilization base material after drying; the other three parts are used for a washing test, the mass of the cement and the fly ash can be calculated after washing and drying, and the mixing amount of the cement and the fly ash is further calculated by combining other known amounts;
(2) simultaneously putting any three parts of the raw materials into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying to constant weight, carefully taking out the dried raw materials and putting the dried raw materials into a dryer, cooling and weighing the raw materials to be accurate to 0.01 g;
(3) for the dried three parts of cement stabilized base material, the mass before drying is respectively set as
The mass after drying is respectively
Having an average value of
，
；
The mass of water in the three parts of cement stabilized base material is respectively set as
Then, then
、
、
；
The average mass of water in the three cement stabilized base materials is set as
Then, then
The mass units of the cement stabilized base layer material and the water in the above formulas are g, the calculation is accurate to 0.01g, and the arithmetic mean value of the mass of the water in the three cement stabilized base layer materials is used as a measured value;
(4) for the remaining three cement-stabilized base materials used for washing, the mass before washing is respectively set as
The average of the three is
；
(5) Pouring one part of cement-stabilized base material into a 0.075mm square-hole sieve, opening a water faucet opposite to the square-hole sieve, fully washing the cement-stabilized base material in the square-hole sieve by water flow, shaking the square-hole sieve while washing for about 300-400 s, taking great care in the whole washing process, strictly preventing any loss of particles with the particle size larger than 0.075mm until all cement and fly ash in the cement-stabilized base material are washed clean, and turning off the water faucet until the water flow becomes clear and transparent, and then respectively and sequentially referring to the above steps to finish a washing test on the remaining two parts of cement-stabilized base material to be washed;
(6) screening residual substances on three parts of washed cement-stabilized base material, carefully transferring the residual substances into appropriate enamel plates respectively, simultaneously putting the three enamel plates into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying the enamel plates to constant weight, carefully taking out the enamel plates, putting the enamel plates into a dryer, cooling the enamel plates, and then weighing the mass of the enamel plates to be accurate to 0.01 g;
(7) calculating the average mass of the cement and the fly ash:
in the formula:
in the formula:
(8) calculating the water content of the cement stabilized base material and the mixing amount of the cement and the fly ash
Water content of cement stabilized base material
In the formula:
cement and flyash mixing amount of cement stabilized base material
In the formula:
Example 6:
according to the proportioning method of the ultra-large-volume fly ash cement stabilized base material in the embodiment 1, 2, 3, 4 or 5, the three different water contents are respectively 3.8%, 4.8% and 4.3%.
A special vibration mixer for proportioning a super-large-volume fly ash cement stabilized base material comprises the following components: support 2, churn support 10, agitator motor 3 and churn motor 4, the churn support in set up churn 9, churn bottom be fixed with churn axle 11, churn axle be connected with churn rotating device, the inside (mixing) shaft 7 that sets up of churn, the (mixing) shaft eccentric settings in the churn in, the (mixing) shaft on be fixed with stirring leaf 8, the (mixing) shaft be connected with (mixing) shaft rotating device.
Example 7:
according to the proportioning method of the ultra-large mixing amount fly ash cement stabilization base layer material in the embodiment 1, 2, 3, 4, 5 or 6, the three different water contents are respectively 3.8%, 4.8% and 4.3%.
Example 8:
the special vibration mixer for proportioning the ultra-large-volume fly ash cement stabilized base material according to the embodiment 1, 2, 3, 4, 5, 6 or 7, wherein the mixing drum rotating device comprises a mixing drum motor 4 and a mixing drum transmission shaft 6, the mixing drum transmission shaft is connected with the inside of the bracket through a bearing, bevel gears are respectively fixed at two end parts of the mixing drum transmission shaft, the bevel gear at one end of the mixing drum transmission shaft is meshed with the bevel gear on the mixing drum shaft, and the bevel gear at the other end of the mixing drum transmission shaft is meshed with the bevel gear on the mixing drum motor shaft 5.
Example 9:
the special vibration stirring machine for proportioning the ultra-large-volume fly ash cement stabilized base material according to the embodiment 1, 2, 3, 4, 5, 6, 7 or 8, wherein the stirring shaft rotating device comprises a stirring motor 3, a stirring shaft transmission shaft 1 and a stirring motor shaft 12, the stirring shaft transmission shaft is connected with the inside of the bracket through a bearing, bevel gears are respectively fixed at two ends of the stirring shaft transmission shaft, the bevel gear at one end of the stirring shaft transmission shaft is meshed with the bevel gear on the stirring motor shaft, and the bevel gear at the other end of the stirring shaft transmission shaft is meshed with the bevel gear on the stirring shaft.
Example 10:
according to the special vibration stirring machine for proportioning the super-large-volume fly ash cement stable base material in the embodiment 1, 2, 3, 4, 5, 6, 7, 8 or 9, the stirring blades on the stirring shaft are respectively divided into an upper group and a lower group, the lower group is three stirring blades which are uniformly arranged on the stirring shaft, an included angle of 120 degrees is formed between every two adjacent stirring blades, and the upper group is one stirring blade.
The use method of the vibration stirrer comprises the following steps:
(1) carefully clean the barrel and the stirring vane of vibration mixer once with the wet rag, then add coarse aggregate, fine aggregate and the cementitious material (the mixture of the two) that weigh in advance in proper order in the barrel of vibration mixer, start control agitator motor and churn motor, the agitator motor shaft drives the (mixing) shaft rotation, the (mixing) shaft drive (mixing) shaft rotates and realizes the stirring, the churn motor shaft drives the churn transmission shaft and rotates simultaneously, the churn transmission shaft drives the churn shaft and rotates, realize the rotation of churn.
(2) Continuously stirring for 10-20 s, observing the aggregate and the cementing material by visual inspection, adding the weighed water for stirring and the admixture (the admixture needs to be mixed with the water for stirring) into the mixture at the same time, and continuously stirring for 90-120 s.
(3) Two problems should be noted when adding mixing water and admixtures: firstly, the safety is noticed, no any part of the operator is touched, secondly, the normative of the operation is noticed, the mixture of the mixing water and the admixture is necessarily poured into the aggregate and the cementing material, but not directly poured on the stirring blade and the cylinder.
(4) When the preset stirring time is over and the color of the mixture is observed to be uniform by visual observation, the stirring can be stopped and a proper container for containing the mixture is prepared. At the moment, the mixer cylinder can be inching to rotate to a proper position, the container for containing the mixture is placed below the discharge port of the mixer, the discharge port is opened, and the mixing blade is inching to discharge the mixed mixture.
The innovation point of the vibration stirrer is as follows: the invention of the vibration stirrer breaks through the traditional manual mixing mode adopted by all the inorganic binders of the pavement base in the laboratory, improves the working efficiency and realizes the seamless butt joint of the mixing mode of the inorganic binders of the laboratory and the construction site.
A method for proportioning a super-large-amount fly ash cement stable base material comprises the following steps:
the method comprises the following steps: the grading range of the cement stabilization base layer material is selected according to the principle that a framework is compact and the minimum void ratio is combined;
step two: determining the optimal mixing amount of the composite polycarboxylate high-performance admixture;
step three: stirring the cement stabilized base material by using a vibrating stirrer to perform a standard compaction test so as to determine the optimal water content and the maximum density of a test piece without lateral limit compressive strength;
step four: forming an unconfined compressive strength test piece according to the maximum dry density of 98% by taking the optimal water content and the corresponding maximum dry density obtained in the step three as the basis, and performing an unconfined compressive strength test;
step five: and detecting the actual water content and the mixing amount of the cement and the fly ash of the cement stabilization base material, wherein the cement stabilization base material is newly stirred with the optimal water content and the maximum dry density.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following specific steps: the grading of the cement stabilized base material is based on the principle that a skeleton is compact and the minimum void ratio is combined, multistage 19mm-26.5mm particle size aggregates are used for forming a stressed system skeleton, 9.5mm-19mm particle size aggregates are used for filling the gaps, 4.75mm-9.5mm particle size aggregates are used for filling the gaps formed by 9.5mm-19mm particle size aggregates, 0mm-4.75mm particle size aggregates are used for filling the gaps formed by 9.5mm-16mm particle size aggregates, the multistage distribution aggregates are organically bonded together by the minimum water content and 3.8% -4.8% of cementing material mixing amount (cement and fly ash) to form an integral pavement base cement stabilized base material, and the integral pavement base material mainly bears complex loads from pavement traffic flow.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following specific steps: firstly, a compaction test is carried out on the cement stabilization base material without adding or reducing the water reducing agent to obtain the optimal water content, the water consumption of the cement stabilization base material added with the water reducing agent is determined according to the water reducing rate of the high-performance water reducing agent, then the compaction test is carried out to further obtain the optimal water content and the maximum dry density of the cement stabilization base material added with the additive, and at the moment, the addition amount of the high-performance water reducing agent is the optimal addition amount.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following specific steps: the method comprises the following steps of stirring a cement stabilized base material by using a vibrating stirrer to perform a standard compaction test, determining the optimal water content and the maximum density of a test piece without lateral limit compressive strength, and performing a basic principle of the standard compaction test: compacting by using three cement and fly ash mixing amounts and three different water contents;
the specific method comprises the following steps: the vertical floating is plus or minus 0.5 percent to plus or minus 0.8 percent by taking the given cement and fly ash mixing amount as a reference, so that three different cement and fly ash mixing amounts exist, while determining the mixing amount of cement and fly ash, mixing more than II-class fly ash accounting for 50% of the total amount of the cementing material, determining the mixing amount of the composite polycarboxylate high-performance admixture through tests, selecting three different water contents with the same water required for mixing cement stabilized base materials, determining a reference water content according to the known water absorption of coarse and fine aggregates, the water consumption of standard consistence of binding materials and the like by the selection method, and then the upper and lower floating is +/-0.8% -1.2%, so that three different water contents and three different cement dosages are simultaneously available, and after the compaction tests are completed, the maximum dry density corresponding to the optimal water content can be obtained.
The proportioning method of the ultra-large amount of fly ash cement stable base material comprises the following concrete steps:
(1) uniformly stirring the cement stabilization base material, randomly weighing six parts with the same mass for later use, wherein three parts are used for a drying test, and calculating the water content of the cement stabilization base material after drying; the other three parts are used for a washing test, the mass of the cement and the fly ash can be calculated after washing and drying, and the mixing amount of the cement and the fly ash is further calculated by combining other known amounts;
(2) simultaneously putting any three parts of the raw materials into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying to constant weight, carefully taking out the dried raw materials and putting the dried raw materials into a dryer, cooling and weighing the raw materials to be accurate to 0.01 g;
(3) for the dried three parts of cement stabilized base material, the mass before drying is respectively set as
The mass after drying is respectively
Having an average value of
，
；
The mass of water in the three parts of cement stabilized base material is respectively set as
Then, then
、
、
；
The average mass of water in the three cement stabilized base materials is set as
Then, then
The mass units of the cement stabilized base layer material and the water in the above formulas are g, the calculation is accurate to 0.01g, and the arithmetic mean value of the mass of the water in the three cement stabilized base layer materials is used as a measured value;
(4) for the remaining three cement-stabilized base materials used for washing, the mass before washing is respectively set as
The average of the three is
；
(5) Pouring one part of cement-stabilized base material into a 0.075mm square-hole sieve, opening a water faucet opposite to the square-hole sieve, fully washing the cement-stabilized base material in the square-hole sieve by water flow, shaking the square-hole sieve while washing for about 300-400 s, taking great care in the whole washing process, strictly preventing any loss of particles with the particle size larger than 0.075mm until all cement and fly ash in the cement-stabilized base material are washed clean, and turning off the water faucet until the water flow becomes clear and transparent, and then respectively and sequentially referring to the above steps to finish a washing test on the remaining two parts of cement-stabilized base material to be washed;
(6) screening residual substances on three parts of washed cement-stabilized base material, carefully transferring the residual substances into appropriate enamel plates respectively, simultaneously putting the three enamel plates into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying the enamel plates to constant weight, carefully taking out the enamel plates, putting the enamel plates into a dryer, cooling the enamel plates, and then weighing the mass of the enamel plates to be accurate to 0.01 g;
(7) calculating the average mass of the cement and the fly ash:
in the formula:
in the formula:
(8) calculating the water content of the cement stabilized base material and the mixing amount of the cement and the fly ash
Water content of cement stabilized base material
In the formula:
cement and flyash mixing amount of cement stabilized base material
In the formula:
the average mass of crushed stones except water, cement and fly ash in the cement stabilized base material dried after washing is three parts, and the unit g is accurate to 0.01 g.
The proportioning method of the ultra-large-volume fly ash cement stable base material comprises the following steps of respectively setting the water content of three different materials to be 3.8%, 4.8% and 4.3%.
Basic test of the invention
1. Coarse aggregate test (JTG E42-2005): including sieve analysis (T0302-2005), needle flake particle content (T0312-2005), crush index value (T0316-2005), bulk density (T0309-2005), apparent density and water absorption (T0304-2005), mud content (T0310-2005), etc.
The coarse aggregate sieve analysis adopts a water washing method, the percentage content of undersize substances smaller than 0.075mm can be calculated after the sieve analysis test is finished, and the percentage content is PUnder sieve GAnd (4) showing.
Fine aggregate test (JTG E42-2005): including sieve analysis (T0327-2005), density and water absorption (T0330-2005), bulk density (T0331-2005), apparent density (T0328-2005), mud content (T0333-2005), and the like.
And a cement test (JTG E30-2005) including fineness (T0502-2005), density (T0503-2005), specific surface area (T0504-2005), water consumption for standard consistency, setting time, stability (T0505-2005), mortar strength (T0506-2005), and the like.
Detecting the content of the screenings which are larger than 0.075mm in the cement and the fly ash, and setting the percentage content
. In order to match with the analysis work of coarse and fine aggregate sieve, a water sieve method is adopted for detecting the content of the screen residue with the particle size larger than 0.075mm in the cement and the fly ash (the test method can refer to the current national standard GB/T1345-2005 sieve analysis method for cement fineness test method, clauses 5-8 of P1-P5), and the screen residue is used
And (4) showing. The invention is original in that the sieve residue content of more than 0.075mm in the cement and the sieve for detecting the coarse and fine aggregates are both 0.075mm square-hole sieves.
Fly ash test (GB/T1596-2017): comprises fineness (GB/T1345-2017), water demand ratio (GB/T1596-2017), loss on ignition (GB/T1596-2017), water content (GB/T1596-2017), stability (GB/T1346-2017), strength activity index (GB/T1596-2017) and the like.
Concrete admixture (GB 8076-2008) test: including water reducing rate (GB 8076-2008), setting time difference (GB 8076-2008), compressive strength ratio (GB 8076-2008) and the like.
Claims (10)
1. A method for proportioning super-large-dosage fly ash cement stable base materials is characterized by comprising the following steps: the method comprises the following steps:
the method comprises the following steps: the grading range of the cement stabilization base layer material is selected according to the principle that a framework is compact and the minimum void ratio is combined;
step two: determining the optimal mixing amount of the composite polycarboxylate high-performance admixture;
step three: stirring the cement stabilized base material by using a vibrating stirrer, and then performing a standard compaction test to determine the optimal water content and the maximum dry density of a test piece without lateral limit compressive strength;
step four: forming an unconfined compressive strength test piece according to the maximum dry density of 98% by taking the optimal water content and the corresponding maximum dry density obtained in the step three as the basis, and performing an unconfined compressive strength test;
step five: and detecting the actual water content and the mixing amount of the cement and the fly ash of the cement stabilization base material, wherein the cement stabilization base material is newly stirred with the optimal water content and the maximum dry density.
2. The proportioning method of the ultra-large amount fly ash cement stable base material as claimed in claim 1, which is characterized in that: the specific process of the step one is as follows: the grading of the cement stabilized base material is based on the principle that the skeleton is compact and the minimum void ratio is combined, multistage 19mm-26.5mm particle size aggregates are used for forming a stressed system skeleton, 9.5mm-19mm particle size aggregates are used for filling the gaps, 4.75mm-9.5mm particle size aggregates are used for filling the gaps formed by 9.5mm-19mm particle size aggregates, 0mm-4.75mm particle size aggregates are used for filling the gaps formed by 9.5mm-16mm particle size aggregates, the multistage aggregate is organically bonded together by the minimum moisture content and 3.8% -4.8% of cementing materials, so that the integral pavement base cement stabilized base material is formed, and the cement stabilized base material is mainly used for bearing complex loads from pavement traffic flow.
3. The proportioning method of the ultra-large amount fly ash cement stable base material as claimed in claim 1, which is characterized in that: the specific process of the second step is as follows: firstly, a compaction test is carried out on the cement stabilization base material without adding or reducing the water reducing agent to obtain the optimal water content, the water consumption of the cement stabilization base material added with the water reducing agent is determined according to the water reducing rate of the high-performance water reducing agent, then the compaction test is carried out to further obtain the optimal water content and the maximum dry density of the cement stabilization base material added with the additive, and at the moment, the addition amount of the high-performance water reducing agent is the optimal addition amount.
4. The proportioning method of the ultra-large amount fly ash cement stable base material as claimed in claim 1, which is characterized in that: the third step comprises the following specific processes: stirring the cement stabilized base material by using a vibrating stirrer, then performing a standard compaction test, determining the minimum water content and the maximum density of a test piece without the confined compressive strength, and performing the basic principle of the standard compaction test: compacting by using three cementing material mixing amounts and three different water contents; the specific method comprises the following steps: the vertical floating is plus or minus 0.5 percent to plus or minus 0.8 percent by taking the given cement and fly ash mixing amount as a reference, so that three different cement and fly ash mixing amounts exist, while determining the mixing amount of cement and fly ash, mixing more than II-class fly ash accounting for 50% of the total amount of the cementing material, determining the mixing amount of the composite polycarboxylate high-performance admixture through tests, selecting three different water contents with the same water required for mixing cement stabilized base materials, determining a reference water content according to the known water absorption of coarse and fine aggregates, the water consumption of standard consistence of binding materials and the like by the selection method, and then the upper and lower floating is +/-0.8% -1.2%, so that three different water contents and three different cement dosages are simultaneously available, and after the compaction tests are completed, the maximum dry density corresponding to the optimal water content can be obtained.
5. The proportioning method of the ultra-large amount fly ash cement stable base material as claimed in claim 1, which is characterized in that: the concrete process of the step five is as follows:
(1) uniformly stirring the cement stabilization base material, randomly weighing six parts with the same mass for later use, wherein three parts are used for a drying test, and calculating the water content of the cement stabilization base material after drying; the other three parts are used for a washing test, the mass of the cement and the fly ash can be calculated after washing and drying, and the mixing amount of the cement and the fly ash is further calculated by combining other known amounts;
(2) simultaneously putting any three parts of the raw materials into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying to constant weight, carefully taking out the dried raw materials and putting the dried raw materials into a dryer, cooling and weighing the raw materials to be accurate to 0.01 g;
(3) for the dried three parts of cement stabilized base material, the mass before drying is respectively set as
The mass after drying is respectively
Having an average value of
，
；
The mass of water in the three parts of cement stabilized base material is respectively set as
Then, then
、
、
；
The average mass of water in the three cement stabilized base materials is set as
Then, then
The mass units of the cement stabilized base layer material and the water in the above formulas are g, the calculation is accurate to 0.01g, and the arithmetic mean value of the mass of the water in the three cement stabilized base layer materials is used as a measured value;
(4) for the remaining three cement-stabilized base materials used for washing, the mass before washing is respectively set as
The average of the three is
；
(5) Pouring one part of cement-stabilized base material into a 0.075mm square-hole sieve, opening a water faucet opposite to the square-hole sieve, fully washing the cement-stabilized base material in the square-hole sieve by water flow, shaking the square-hole sieve while washing for about 300-400 s, taking great care in the whole washing process, strictly preventing any loss of particles with the particle size larger than 0.075mm until all cement and fly ash in the cement-stabilized base material are washed clean, and turning off the water faucet until the water flow becomes clear and transparent, and then respectively and sequentially referring to the above steps to finish a washing test on the remaining two parts of cement-stabilized base material to be washed;
(6) screening residual substances on three parts of washed cement-stabilized base material, carefully transferring the residual substances into appropriate enamel plates respectively, simultaneously putting the three enamel plates into a blast drying box which is heated to 105 +/-5 ℃ in advance, drying the enamel plates to constant weight, carefully taking out the enamel plates, putting the enamel plates into a dryer, cooling the enamel plates, and then weighing the mass of the enamel plates to be accurate to 0.01 g;
(7) calculating the average mass of the cement and the fly ash:
in the formula:
in the formula:
(8) calculating the water content of the cement stabilized base material and the mixing amount of the cement and the fly ash
Water content of cement stabilized base material
In the formula:
cement and flyash mixing amount of cement stabilized base material
In the formula:
6. The proportioning method of the ultra-large amount fly ash cement stable base material as claimed in claim 1 or 4, which is characterized in that: the three different water contents are respectively 3.8%, 4.8% and 4.3%.
7. A special vibration mixer for proportioning a super-large-volume fly ash cement stabilized base material comprises the following components: support, churn support, agitator motor and churn motor, characterized by: the mixing drum support in set up the mixing drum, mixing drum bottom be fixed with the mixing drum axle, the mixing drum axle be connected with mixing drum rotating device, the inside (mixing) shaft that sets up of mixing drum, the (mixing) shaft eccentric settings in the mixing drum in, the (mixing) shaft on be fixed with the stirring leaf, the (mixing) shaft be connected with (mixing) shaft rotating device.
8. The special vibration mixer for proportioning the ultra-large amount of fly ash cement stabilized base material as claimed in claim 7, which is characterized in that: the stirring cylinder rotating device comprises a stirring cylinder motor and a stirring cylinder transmission shaft, the stirring cylinder transmission shaft is connected with the inside of the support through a bearing, bevel gears are respectively fixed at two ends of the stirring cylinder transmission shaft, the bevel gear at one end of the stirring cylinder transmission shaft is meshed with the bevel gear on the stirring cylinder shaft, and the bevel gear at the other end of the stirring cylinder transmission shaft is meshed with the bevel gear on the stirring cylinder motor shaft.
9. The special vibration mixer for proportioning the ultra-large amount of fly ash cement stabilized base material as claimed in claim 7, which is characterized in that: the stirring shaft rotating device comprises a stirring motor, a stirring shaft transmission shaft and a stirring motor shaft, wherein bevel gears are respectively fixed at two ends of the stirring shaft transmission shaft, the bevel gear at one end of the stirring shaft transmission shaft is meshed with the bevel gear on the stirring motor shaft, and the bevel gear at the other end of the stirring shaft transmission shaft is meshed with the bevel gear on the stirring shaft.
10. The special vibration mixer for proportioning the ultra-large amount of fly ash cement stabilized base material as claimed in claim 7, which is characterized in that: the stirring shaft is provided with an upper group of stirring blades and a lower group of stirring blades, the lower group is formed by uniformly arranging three stirring blades on the stirring shaft, an included angle of 120 degrees is formed between every two adjacent stirring blades, and the stirring blades of the upper group are one.
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