CN114804688A - Method for determining gradation and mixing ratio of regenerated mixed fine aggregate - Google Patents
Method for determining gradation and mixing ratio of regenerated mixed fine aggregate Download PDFInfo
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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
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/0028—Aspects relating to the mixing step of the mortar preparation
- C04B40/0039—Premixtures of ingredients
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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
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/0076—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials characterised by the grain distribution
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- G16C—COMPUTATIONAL CHEMISTRY; CHEMOINFORMATICS; COMPUTATIONAL MATERIALS SCIENCE
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Abstract
The invention belongs to the technical field of building material testing, and relates to a method for determining the gradation and the mixing ratio of regenerated mixed fine aggregates; firstly, preparing an aggregate A, an aggregate B and a mixed aggregate within a certain particle size range; then, respectively carrying out grading screening on the aggregate A, the aggregate B and the mixed aggregate to obtain screened graded materials in each grade of aperture range of each aggregate; measuring the residual sieve amount, apparent dry density and water content of each grade of the sieved graded materials; calculating the mass ratio of the ith grade of the aggregate A, and calculating the screen allowance and the volume percentage of the ith grade in the mixed aggregatePiObtaining gradation and mixing ratio; the invention relates to a method for determining the mixing proportion of each grade of regenerated mixed fine aggregate and the grading of the fine aggregate based on the water content and the water absorption difference of each component of the regenerated mixed aggregate; solves the problem that the regeneration mixing fine aggregate after crushing can not be determined in the prior artProblem of grading curve.
Description
Technical Field
The invention belongs to the technical field of building material testing, and relates to a method for determining the gradation and the mixing ratio of regenerated mixed fine aggregates.
Background
The recycled mixed aggregate produced by modifying the old city and prepared by dismantling the construction waste is mainly recycled concrete and recycled bricks, and according to relevant statistics, the waste concrete accounts for about 41 percent and the waste bricks account for more than 40 percent of the construction waste. The waste bricks comprise clay bricks, slag bricks, coal gangue bricks and the like. However, the waste bricks have the characteristics of low strength, high porosity, high water absorption and the like, and how to recycle the waste bricks becomes a hot point of research. In the research of a plurality of utilization directions of waste bricks, the waste bricks are used for preparing the recycled fine aggregate for recycled brick aggregate concrete, pavement base, thermal insulation mortar, pipe ditch backfill and the like, which is a utilization way with high cost performance and promotes the realization of double carbon. In order to prepare reasonable regenerated mixed aggregate, the patent method (zl 201910093050.1) proposes a method of side limit crushing, but the method cannot determine the volume ratio and the grading curve of the regenerated mixed fine aggregate (the particle size is not more than 4.75 mm) after crushing.
Disclosure of Invention
The invention overcomes the defects of the prior art, and provides a method for determining the gradation and the mixing ratio of the regenerated mixed fine aggregate based on the water content and the water absorption difference of each component of the regenerated mixed aggregate; so as to determine the mixing proportion and the fine aggregate gradation of each size fraction of the regenerated mixed fine aggregate.
In order to achieve the above object, the present invention is achieved by the following technical solutions.
A method for determining the gradation and the mixing ratio of regenerated mixed fine aggregates comprises the following steps:
1) preparing an aggregate A, an aggregate B and a mixed aggregate within a certain particle size range; the mixed aggregate consists of the aggregate A and the aggregate B, and the difference of the water absorption rates of the aggregate A and the aggregate B is more than or equal to 2 percent.
2) Respectively carrying out grading screening on the aggregate A, the aggregate B and the mixed aggregate to obtain screened graded materials in each grade of aperture range of each aggregate; and measuring the residual sieve amount, the apparent dry density and the water content of each grade of the sieved and graded materials.
3) Calculating the mass of aggregate A and aggregate B in the i-th grade mixed fine aggregate according to the formula (1) and the formula (2)Formula (3) calculating the quality ratio R of the ith grade of aggregate A Ai ；
In the formula, m hAi Is the drying screen allowance of the ith grade of aggregate A, m hBi The drying screen allowance of the ith grade of the waste brick aggregate B; m is hi The balance of the mixed aggregate in the natural state of the ith grade is screened; omega Ai The water content of the i-th grade aggregate A; omega Bi The water content of the i-level waste brick aggregate B; m is hdi The quality of the mixed aggregate drying substance of the ith grade.
4) Calculating the volume V of the ith grade of screen residue in the mixed aggregate according to the formula (4) ih (ii) a Calculating the volume percentage of the ith grade in the mixed aggregate according to the formula (5)Pi；
In the formula, ρ Adi (ii) the apparent dry density of aggregate grade i; rho Bdi The apparent dry density of aggregate B grade i.
Preferably, aggregate A, aggregate B and mixed aggregate having a particle size in the range of 0.075mm to 4.75mm are prepared in step 1.
Preferably, the step 2 of classifying and screening is to sequentially screen the aggregate A, the aggregate B and the mixed aggregate by using a multi-stage standard screen, wherein the aperture of the multi-stage standard screen is sequentially 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075 mm.
Preferably, a cumulative sifting volume distribution curve of the mixed aggregate is drawn, the ordinate is the cumulative sifting volume percentage content, and the abscissa is a logarithmic coordinate ln (di/d) 2.36 ) And di is 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm in sequence.
Preferably, the water content is calculated by adopting a drying method.
Preferably, the aggregate B is weak aggregate with uniaxial compressive strength less than or equal to 15 MPa.
Preferably, the aggregate B is one of clay brick, slag brick, coal gangue brick and coal gangue.
Preferably, the aggregate A is a strong aggregate with uniaxial compressive strength of more than or equal to 30 MPa.
Preferably, the aggregate A is a material with low water absorption rate, such as limestone or recycled concrete.
Preferably, the aggregates A and B in the step 1 are obtained by crushing and screening the aggregates in a natural state by a crusher.
Compared with the prior art, the invention has the following beneficial effects:
the invention provides a method for determining the mixing proportion of each grade of regenerated mixed fine aggregate and the grading of the fine aggregate based on the water content and water absorption difference of each component of the regenerated mixed aggregate; solves the problem that the volume ratio and the grading curve of the crushed regenerated mixed fine aggregate (the grain diameter is not more than 4.75 mm) can not be determined in the prior art.
Drawings
FIG. 1 is a cumulative oversize volume distribution curve of mixed fine aggregate after side limiting crushing in the examples.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail with reference to the embodiments and the accompanying drawings. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention. The technical solution of the present invention is described in detail below with reference to the embodiments and the drawings, but the scope of protection is not limited thereto.
A method for determining the gradation and mixing ratio of regenerated mixed aggregate of building garbage includes such steps as preparing the aggregate A in natural state and the initial sample of waste aggregate, which may be one of clay brick, slag brick and gangue brick. The grain diameter interval of the prepared aggregate A and the initial sample of the waste brick aggregate is the same, the grain diameter of the initial sample is not less than 4.75mm, the uniaxial compressive strength of the aggregate A is not less than 30MPa, the aggregate A can be limestone or recycled concrete and other materials, the uniaxial compressive strength of the waste brick aggregate is not more than 15MPa, and the waste brick aggregate can be waste coal gangue bricks, waste clay bricks, slag bricks or coal gangue. If the sample is excessively dried, spraying a proper amount of water on the sample before sample preparation, uniformly mixing, and then putting the sample into a closed container for material sealing for 24 hours.
In this embodiment, a method for determining components and gradation in a mixed fine aggregate is described by taking a waste coal gangue brick and limestone mixed aggregate as an example. The method comprises the following specific steps:
1) the aggregate A is natural limestone, the waste brick aggregate is waste coal gangue bricks, the limestone and the waste coal gangue bricks in a natural state are respectively crushed and screened by a crusher, and an initial sample with the particle size of 4.75-9.5 mm is prepared.
2) Limestone with the particle size of 4.75 mm-9.5 mm and waste coal gangue bricks are mixed according to the mass ratio of 4.2: 5.8, mixing evenly, dividing into 3 parts in equal proportion, and then placing into a closed container for storage to prevent water loss.
3) Taking out one mixed sample randomly, loading into a sample cylinder with the specification of phi 150mm multiplied by 125mm, keeping the height of the sample lower than the upper opening of the sample cylinder by at least 10mm after filling the sample, placing a pressurizing head with the diameter of phi 149mm, and then placing a side limit crushing device filled with the sample on a press machine for loading and crushing. The loading pressure p was 500 kN. 4) After loading, the crushed mixed aggregate is sequentially classified and sieved by a standard square-hole sieve with the particle size of 4.75-0.075 mm, particles with the particle size of more than or equal to 4.75mm and the particle size of less than 0.075mm are sieved, the particles are sieved until no obvious sieved matter exists within 1min, and the particles with the particle size of 0.075mm-4.75 mm are reserved after sieving. Then, the amount of the sieve residue m in each stage was measured in order hi The sample number of the sieve residue per stage less than 4.75mm is marked as S i ，m hi And S i The i in (1) is 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm in sequence, and the precision is accurate to 0.01g when weighing. To ensure the accuracy of the test results, 3 parallel tests were performed for a 500kN loading pressure, and the average value was taken as the sieve allowance per stage. Respectively putting the weighed mixed fine aggregate with the screen residue at each stage into an oven, drying the mixed fine aggregate at the constant temperature of 105-110 ℃ to constant weight, taking out the dried sample and the box, putting the dried sample and the box into a dryer for cooling (generally 0.5-1 h), covering the box cover after cooling, weighing, and recording the corresponding sample mass after drying as m hdi Accurate to 0.01 g.
5) And (5) repeating the step 3 to the step 4, performing 2 times of parallel tests, and taking the average value of the test results of the 3 times of parallel tests as a test grading curve. The average of three test samples is shown in table 1.
6) Taking the natural aggregate A prepared in the step 1, taking a limestone initial sample with the particle size of 4.75-9.5 mm, crushing under the condition of 600KN side limit, sequentially grading and screening the crushed sample by using a standard square-hole sieve with the particle size of 4.75-0.075 mm until no obvious screening matter exists within 1min, reserving the screen allowance of each grade of the standard square-hole sieve with the particle size of 0.075-2.36 mm, sequentially numbering the screen allowances of each grade, and marking as S Ai And i has the same meaning as above. The residue sample of each stage is not less than 600 g.
7) Taking the initial sample of the coal gangue brick aggregate prepared in the step 1, crushing the initial sample under the condition of 300KN side limit, sequentially classifying and screening the crushed sample by using a standard square-hole sieve with the size of 4.75mm to 0.075mm until no obvious screening matter exists within 1min, reserving the screen allowance of each level of the standard square-hole sieve with the size of 0.075mm to 2.36mm, sequentially numbering the screen allowance of each level, and recording as S Bi And i has the same meaning as above. The residue sample of each stage is not less than 600 g.
8) Limestone aggregate S is respectively and sequentially determined according to standard 'road engineering aggregate test regulation' (JTG E42-2005) Ai And gangue brick aggregate S Bi The apparent dry density and the water content of each grade of the screened sample of 2.36mm to 0.075mm are respectively recorded as rho Adi And ρ Bdi And the water content is respectively marked as omega Ai And ω Bi . The results of the tests on the apparent dry density and the water content of each particle size of the limestone aggregate and the coal gangue brick aggregate are shown in Table 1.
9) The mass of aggregate A and aggregate B in the ith-grade mixed fine aggregate is calculated according to the formulas (1) and (2), 3 bits are calculated after the decimal point is reached, and the mass ratio R of the aggregate A Ai Calculating according to the formula (3):
in the formula: i, sequentially taking 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075 mm;
m hAi 、m hBi the mass of the i-th grade of the sieved mixed fine aggregate after the aggregate A and the aggregate B are dried respectively, and the calculation result is shown in table 2.
10) After side-limiting crushing, the volume of the i-th screen residue in the fine aggregate was mixed (V) ih ) Calculating to the 3 bits after the decimal point according to the formula (4):
V ih = m hdi (R Ai /ρ Adi + (1- R Ai )/ρ Bdi ) （4）
volume percent of grade i in the mixed fine aggregatePi(%) calculated according to equation (5) to 0.01%:
in the formula: i, sequentially taking 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075 mm;
the calculation results are shown in Table 2.
11) Drawing a cumulative sifting volume distribution curve of the mixed fine aggregate after the lateral limit crushing, wherein the ordinate is the cumulative sifting volume percentage content, and the abscissa is the logarithmic coordinate ln (di/d) max ) Di is 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm in sequence; d max 2.36 was taken.
While the invention has been described in further detail with reference to specific preferred embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. A method for determining the gradation and the mixing ratio of regenerated mixed fine aggregates is characterized by comprising the following steps of:
1) preparing an aggregate A, an aggregate B and a mixed aggregate within a certain particle size range; the mixed aggregate consists of the aggregate A and the aggregate B, and the difference of the water absorption rates of the aggregate A and the aggregate B is more than or equal to 2 percent;
2) respectively carrying out grading screening on the aggregate A, the aggregate B and the mixed aggregate to obtain screened graded materials in each grade of aperture range of each aggregate; measuring the residual sieve amount, apparent dry density and water content of each grade of the sieved graded materials;
3) calculating the mass of aggregate A and aggregate B in the ith grade of mixed fine aggregate according to the formulas (1) and (2), and calculating the mass ratio R of the aggregate A to the ith grade according to the formula (3) Ai ；
In the formula, m hAi Is the drying screen allowance of the ith grade of aggregate A, m hBi The drying screen allowance of the ith grade of the waste brick aggregate B; m is hi The balance of the mixed aggregate in the natural state of the ith grade is screened; omega Ai The water content of the i-th grade aggregate A; omega Bi The water content of the i-level waste brick aggregate B; m is hdi The quality of the mixed aggregate drying substance of the ith grade;
4) calculating the volume V of the ith grade of screen residue in the mixed aggregate according to the formula (4) ih (ii) a Calculating the volume percentage of the ith grade in the mixed aggregate according to the formula (5)Pi；
In the formula, ρ Adi (ii) the apparent dry density of aggregate grade i; rho Bdi The apparent dry density of aggregate B grade i.
2. A regenerative mixed fine aggregate grading and mixing ratio determination method according to claim 1, characterized in that aggregate a, aggregate B and mixed aggregate with a particle size ranging from 0.075mm to 4.75mm are prepared in step 1.
3. A method for grading and mixing ratio determination of recycled mixed fine aggregate according to claim 2, wherein the step 2 of classifying and screening is to use multi-stage standard sieves to sieve the aggregate a, the aggregate B and the mixed aggregate in turn, the multi-stage standard sieves having the aperture of 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm in turn.
4. The method as claimed in claim 3, wherein the method comprises drawing a cumulative oversize volume distribution curve of the mixed aggregate, the ordinate being the cumulative percent oversize volume, and the abscissa being the logarithmic coordinate ln (di/d) 2.36 ) And di is 2.36mm, 1.18mm, 0.6mm, 0.3mm, 0.15mm and 0.075mm in sequence.
5. The method for determining the gradation and mixing ratio of reclaimed mixed fine aggregates according to claim 1, wherein the water content is calculated by a drying method.
6. The method for determining the gradation and mixing ratio of recycled mixed fine aggregates according to claim 1, wherein the aggregates B are weak aggregates having uniaxial compressive strength of 15MPa or less.
7. The method as claimed in claim 6, wherein the aggregate B is one of clay brick, slag brick, gangue brick and coal gangue.
8. The method for determining the gradation and mixing ratio of the recycled mixed fine aggregate according to claim 1, wherein the aggregate A is a strong aggregate having a uniaxial compressive strength of not less than 30 MPa.
9. The method of claim 8 wherein aggregate a is limestone or recycled concrete.
10. The method for determining the gradation and mixing ratio of reclaimed mixed fine aggregates according to any one of claims 1 or 6 to 9, wherein the aggregates A and B in step 1 are obtained by crushing and screening the aggregates in a natural state by a crusher.
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