CN116756467A - Full calculation method for dynamic adjustment of railway concrete batching theory mix proportion parameters - Google Patents
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- 239000004615 ingredient Substances 0.000 claims description 52
- 229920006395 saturated elastomer Polymers 0.000 claims description 43
- 238000010521 absorption reaction Methods 0.000 claims description 40
- 239000004568 cement Substances 0.000 claims description 12
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Abstract
The invention discloses a full calculation method for dynamically adjusting railway concrete batching theory mix proportion parameters, which is used for defining preferable laboratory theoretical mix proportion test indexes, raw material types, consumption and property parameters; detecting and obtaining partial performance parameters of the sand and crushed stone raw materials entering the field through a test; according to the raw material test detection performance parameters, carrying out volume analysis on the optimal theoretical mixing proportion of the laboratory, and calculating the dry compaction volume rate of broken stones; determining a dry compaction volume rate correction coefficient of the crushed stone in a proportioning theory proportioning ratio, adjusting the dry compaction volume rate, and calculating the use amount of the crushed stone; based on a plasma volume method, carrying out volume analysis on a batch theory mixing ratio; and calculating the volume and the dosage of sand and the dosage of water in the proportioning theory proportioning. According to the invention, the railway concrete batching theoretical mixing proportion meeting the requirements of the strength grade, the working performance and the durability of the optimal laboratory theoretical mixing proportion can be quickly and accurately adjusted and calculated according to the performance of the raw material detection part.
Description
Technical Field
The invention belongs to the technical field of civil engineering materials, and particularly relates to a full calculation method for dynamically adjusting a railway concrete batching theory mixing ratio parameter.
Background
The high-performance concrete is a novel high-technology green concrete, is made by adopting a modern concrete technology on the basis of greatly improving the performance of common concrete, and takes durability as a main index of design. For different application requirements, high-performance concrete is mainly ensured for the following performances: durability, workability, applicability, mechanical properties, volume stability, economy. The preferred laboratory mix ratio does not determine the final quality of the concrete and quality control in concrete mixing production is also particularly important.
The existing railway concrete mix ratio is usually designed according to JGJ55-2011 common concrete mix ratio design regulations, TB10424-2018 railway concrete engineering construction quality acceptance standards, TB/T3275-2018 railway concrete and Q/CR9207-2017 railway concrete construction technical regulations. However, in concrete mixing production, coarse aggregate grading and sand ratio adjustment are rarely mentioned due to the difference of the consumed sand mining positions and the influence of processing, transportation, loading and unloading processes and other uncertainties. In addition, when the fineness modulus of the sand changes, only "fine sand" and "coarse sand" are given in the JGJ55, and the sand rate can be correspondingly reduced or increased in the mix proportion design, and only the adjustment direction of the sand rate is given. The specification is to define coarse, medium and fine sand according to the fineness modulus range of the sand, the definition range is wider, and even if performance indexes such as fineness modulus of the sand change in the range of the medium coarse sand, the performance of the concrete mixture can also change greatly. In production, the method can also only rely on experience of testers to carry out repeated test adjustment, so that a proper sand-stone ratio is found, the test times are greatly increased, the labor and time cost is increased, the sand-stone ratio is simply adjusted, the change of the concrete volume is easily caused, the 'square expansion' or 'square deficiency' is caused, the phase change is increased or reduced, the dosage of the adhesive is increased, and the concrete working performance, the mechanical performance and the material cost are greatly different. Often, a skilled tester is required to perform a large number of tests, the number and effect of which are severely dependent on the experience of the tester, and the results obtained by different testers may also vary considerably.
Therefore, in the dynamic adjustment of the mixing proportion parameters of the railway concrete batching theory at present, the adjustment of the crushed stone grading and the sand ratio is obtained according to the qualitative analysis and the empirical mode, has guiding significance in a certain range, but cannot cope with the current situation that the mixing proportion needs to be quickly and accurately adjusted in the production process due to frequent raw material change. Therefore, a full calculation method for dynamically adjusting the theoretical proportioning parameters of railway concrete ingredients, which can quantitatively reflect the concrete influence of the thickness degree of sand, the grading of broken stone and other performance index changes on the continuous grading of broken stone, the sand rate, the working performance thereof and the like in the railway concrete mixing production, and can quickly and accurately adjust the mechanical performance, the working performance, the durability and the economical efficiency meeting the theoretical proportioning of a preferred laboratory in the mixing production process according to part of the performances of raw materials, is urgently needed.
Disclosure of Invention
The invention aims to provide a full calculation method for dynamically adjusting the railway concrete batching theory mixing proportion parameters, which solves the problem of how to quickly and accurately adjust the mixing proportion in the production process caused by frequent change of raw material performance in the prior art.
The technical scheme adopted by the invention is as follows;
the method comprises the following steps of 1, defining preferable laboratory theoretical mix proportion test indexes; step 2, determining the types, the amounts and the property parameters of the raw materials of the theoretical mixing proportion of the preferable laboratory; step 3, detecting and obtaining partial performance parameters of the sand and crushed stone raw materials entering the field through a test; step 4, detecting performance parameters according to a raw material test; step 5, carrying out volume analysis on the optimal theoretical mixing proportion of the laboratory; step 6, calculating the dry compaction volume rate of the broken stone of the theoretical mixing proportion of the optimized laboratory; step 7, determining a dry compaction volume rate correction coefficient of the crushed stone in the proportioning theory proportioning ratio, and adjusting the dry compaction volume rate; step 8, calculating the use amount of broken stone in the batch theory mixing proportion; step 9, carrying out volume analysis on the batch theory mixing ratio based on a plasma volume method; and step 10, calculating the volume and the dosage of sand and the dosage of water in the batch theoretical mixing ratio.
The invention is also characterized in that;
the method comprises the following specific steps:
in step 1, the clearly preferred laboratory theoretical mix test indexes include: the concrete strength grade, the designed slump, the concrete air content, the measured density and the water-cement ratio;
in step 2, the theoretical mix proportion raw material types of the laboratory, the material consumption per cubic meter and the raw material property parameters are determined, and the method comprises the following steps: cement density, fly ash density, mineral powder density, sand apparent density, sand saturation and dry density, sand bulk density, sand water absorption, sand bulk density, sand grain gradation and fineness modulus, stone apparent density, stone saturation and dry density, stone bulk density, stone water absorption, stone bulk density, stone dry tap density and stone synthetic gradation curve;
in step 3, the test detects and obtains the performance parameters of the sand and crushed stone raw material part of the entering field, including: sand apparent density, sand saturation surface dry density, sand bulk density, sand water absorption, sand bulk density, sand grain size distribution, fineness modulus and crushed stone single-grain size distribution;
step 4, according to the performance parameters of the advanced raw material test detection, fitting an advanced macadam synthesis grading curve with a preferable laboratory theoretical mixing proportion macadam synthesis grading curve to determine a mixing proportion, and detecting the performance parameters of the synthetic macadam apparent density, saturated surface dry density, bulk density, water absorption, dry tap density and bulk density;
in the step 5, according to the material consumption per cubic meter, the gas content and the raw material performance parameters in the optimal laboratory theoretical mixing proportion, carrying out volume analysis on the optimal laboratory theoretical mixing proportion;
in the step 7, according to the fineness modulus change of the entering sand, determining a dry tap volume rate correction coefficient of the broken stone in the blending proportion of the batching theory, and adjusting the dry tap volume rate of the broken stone in the blending proportion of the batching theory;
in step 8, the usage amount of broken stone per cubic meter in the batching theory mix proportion is calculated.
Step 2 further comprises: if the saturation and dry density of the sand have no measured values, the method is calculated according to the formula (1):
ρ sC ＝ρ sD ·(1+W xs /100) (1)；
wherein ρ is sC Saturation and dry density of sand in a preferred laboratory theoretical mix, ρ sD Bulk density, W, of sand in a preferred laboratory theoretical mix xs The water absorption rate of the sand in the theoretical mixing proportion of the preferable laboratory;
if there is no actual measurement of the apparent density of the sand, it is calculated according to formula (2):
wherein ρ is sA Apparent density ρ of sand in the preferred laboratory theoretical mix sD Bulk density, W, of sand in a preferred laboratory theoretical mix xs The water absorption rate of the sand in the theoretical mixing proportion of the preferable laboratory;
if the saturation and dry density of the crushed stone have no actual measurement value, calculating according to the formula (3):
ρ gC ＝ρ gD ·(1+W xg /100) (3)；
wherein ρ is gC Saturation and dry density of crushed stone in optimal laboratory theoretical mix ratio ρ gD Wool bulk density of crushed stone, W, in a preferred laboratory theoretical mix ratio xg The water absorption rate of crushed stone in the preferable theoretical mixing proportion of a laboratory;
if there is no measured value of the apparent density of the crushed stone, it is calculated according to the formula (4):
wherein: ρ gA Apparent density ρ of crushed stone in the preferred laboratory theoretical mix ratio gD Wool bulk density of crushed stone, W, in a preferred laboratory theoretical mix ratio xg The water absorption rate of the crushed stone in the preferable laboratory theoretical mixing ratio.
Step 3 further comprises: if the saturation and dry density of the entering sand have no actual measurement values, calculating according to the formula (5):
ρ' sC ＝ρ' sD ·(1+W' xs /100) (5)；
wherein: ρ' sC Saturation and dry density of sand in proportion of ingredients theory, ρ' sD The bulk density, W 'of the sand in the proportion of the batching theory' xS The water absorption rate of the sand in the proportion of the ingredient theory,
if the apparent density of the entering sand has no measured value, calculating according to the formula (6):
wherein: ρ sA Apparent density ρ of sand in the proportion of the ingredients theory sD Bulk density of sand in proportion of batch theory, W xs The water absorption rate of the sand in the proportion of the batching theory is improved.
Step 4 further comprises: adopting a trial algorithm when synthesizing continuous grading fitting of the approach coarse aggregate and continuous grading of the coarse aggregate according to a theoretical mix proportion of a preferable laboratory;
if the saturation and dry density of the incoming synthetic continuous graded crushed stone have no actual measurement value, the method is calculated according to the formula (7):
ρ' gC ＝ρ' gD ·(1+W' xg /100) (7)；
wherein ρ' gC Saturation and dry density of crushed stone in proportion of ingredients theory, ρ' gD Wool volume density of crushed stone in proportion of ingredients theory, W' xg The water absorption rate of the crushed stone in the proportion of the ingredient theory is calculated;
if the apparent density of the incoming synthetic continuous graded crushed stone has no measured value, calculating according to the formula (8):
wherein: ρ' gA Apparent density of crushed stone in proportion of ingredients theory, ρ' gD Wool volume density of crushed stone in proportion of ingredients theory, W' xg The water absorption rate of the crushed stone in the proportion of the ingredients theory is achieved.
Step 5 further comprises: the preferred laboratory theoretical mix is subjected to a volumetric analysis under coarse and fine aggregate saturation and dry basis conditions, calculated according to equation (9):
wherein: m's' w In the optimal theoretical mixing proportion of a laboratory, the dosage of concrete water per cubic meter is under the condition of saturated surface dry state of coarse and fine aggregates; m is m c 、m F 、m K The concrete is the cement, the fly ash and the mineral powder in each cubic meter in the optimal theoretical mixing proportion of the laboratory; m's' s 、m' g 、m a 、α、ρ w 、ρ c 、ρ F 、ρ K 、ρ sC 、ρ gC 、ρ a In the preferred laboratory theoretical mix ratio: the method comprises the steps of using sand in a saturated face dry state of each cubic meter of concrete, using gravels in a saturated face dry state of each cubic meter of concrete, using concrete additives of each cubic meter of concrete, and using the volume of air content of each cubic meter of concrete, the density of water, the density of cement, the density of fly ash, the density of mineral powder, the saturated face dry density of the sand, the saturated face dry density of the gravels and the density of the additives;
slurry volume analysis, calculated according to formula (10):
the preferred laboratory theoretical mix ratio, the amount of crushed stone in saturated face dry state per cubic meter of concrete, is calculated according to formula (11):
m' g ＝m g ·(1+W xg /100) (11)；
wherein m is g In the preferable theoretical mixing proportion of the laboratory, the dosage of broken stone in each cubic meter of concrete in the absolute state is W xg In the preferable theoretical mixing proportion of the laboratory, the water absorption rate of the crushed stone;
the preferred laboratory theoretical mix, the amount of sand saturated surface dry per cubic meter of concrete, is calculated according to formula (12):
m' s ＝m s ·(1+W xs /100) (12)；
wherein m is s In the preferable theoretical mixing proportion of the laboratory, the amount of the sand in the concrete per cubic meter in the absolute dry state is W xs In the preferable theoretical mixing proportion of the laboratory, the water absorption rate of the sand;
in the preferred laboratory theoretical mix, the water consumption per cubic meter of concrete under the condition of saturated surface dry state of coarse and fine aggregates is calculated according to the formula (13):
m' w ＝m w -m s ·W xs /100-m g ·W xg /100 (13)；
wherein m is w In the preferable theoretical mixing proportion of the laboratory, the dosage of concrete water per cubic meter is under the condition that coarse and fine aggregates are in a dead dry state.
Step 6 further comprises: calculating the dry compaction volume fraction of the crushed stone of the preferred laboratory theoretical mix ratio according to formula (14):
wherein: v (V) L In the preferable theoretical mixing proportion of the laboratory, the dry compaction volume rate of broken stone in each cubic meter of concrete; ρ gB In the preferable theoretical mixing proportion of the laboratory, the dry tap density of the crushed stone;
step S7 further includes: in the determined proportioning theory, the correction coefficient of the dry compaction volume rate of the broken stone in each cubic meter of concrete is calculated according to the formula (15):
V X ＝0.1×(M x -M' x ) (15)；
wherein: v (V) X The correction coefficient of the dry compaction volume rate of broken stone in each cubic meter of concrete in the proportioning theory; m is M x In the preferable theoretical mixing proportion of the laboratory, the fineness modulus of the sand; m's' x In the proportion of the ingredient theory, the fineness modulus of the sand;
determining the dry tap volume rate of the crushed stone in the batch theoretical mixing ratio, and calculating according to a formula (16):
V T ＝V L +V X (16)；
wherein: v (V) T In the proportioning theory, the dry compaction volume rate of broken stone in each cubic meter of concrete.
Step 8 further comprises: calculating the dosage of each cubic meter of concrete broken stone in the absolute state in the batching theory mixing ratio, and calculating according to a formula (17):
m gT ＝V T ·ρ' gB (17)；
wherein: m is m gT In the proportion of the ingredients theory, the concrete broken stone per cubic meter is used in a state of being completely dryQuantity ρ' gB In the proportion of the ingredients theory, the dry tap density of the crushed stone;
calculating the dosage of the concrete broken stone saturated face dry state per cubic meter in the mixing proportion of the batching theory, and calculating according to a formula (18):
m' gT ＝m gT ·(1+W' xg /100) (18)；
wherein: m's' gT In the mixing proportion of the ingredients theory, the dosage of the concrete broken stone in the saturated face dry state per cubic meter is calculated; m is m gT In the proportion of the ingredients theory, the dosage of the concrete broken stone in the absolute dry state is calculated per cubic meter; w'. xg In the proportion of the ingredients theory, the water absorption rate of the crushed stone is improved.
Step 9 further comprises: the theoretical mix of ingredients is subjected to volumetric analysis and calculated according to formula (19):
wherein m' sT In the proportion of the ingredients theory, the amount of sand per cubic meter of concrete in a saturated face dry state is used; m's' gT In the proportion of the ingredients theory, the amount of broken stone per cubic meter of concrete in a saturated face dry state is used.
Step 10 further comprises: determining the volume of the sand in the saturated surface dry state in the batch theoretical mixing ratio, and calculating according to a formula (21):
wherein: v'. s In the theoretical mixing proportion of ingredients, the volume of the sand in a saturated surface dry state is V, and the volume of the slurry in the theoretical mixing proportion of a preferable laboratory;
calculating the dosage of sand in a saturated face dry state in each cubic meter of concrete in the batching theory mixing ratio, and calculating according to a formula (22):
m' sT ＝V' s ·ρ' sC (22)；
wherein: m's' sT Is the theory of ingredientsIn the mixing proportion, the amount of sand in each cubic meter of concrete in a saturated surface dry state is used;
in the calculation of the batching theory mix ratio, the amount of sand in the concrete per cubic meter in the absolute state is calculated according to the formula (23):
wherein: m is m sT In the proportion of the batching theory, the amount of sand in each cubic meter of concrete in a dry state is used; w'. xs In the proportion of the ingredients theory, the water absorption of the sand is increased;
calculating the water consumption of a batch theoretical mixing ratio, wherein the water consumption of the batch theoretical mixing ratio is the same as the water consumption of a preferable laboratory theoretical mixing ratio under the saturated surface dry state of coarse and fine aggregates based on a plasma volume method, and calculating according to a formula (24):
m' wT ＝m' w ＝m w -m s ·W xs /100-m g ·W xg /100(24)；
wherein: m's' wT In the mixing proportion of the batching theory, the dosage of concrete water per cubic meter is under the condition of saturated surface dry state of coarse and fine aggregates; m's' w In the optimal theoretical mixing proportion of a laboratory, the dosage of concrete water per cubic meter is under the condition of saturated surface dry state of coarse and fine aggregates;
in the determined batching theory mixing proportion, the water consumption of the coarse and fine aggregates per cubic meter of concrete is calculated according to the formula (25):
m wT ＝m' wT +m sT ·W' xs /100+m gT ·W' xg /100(25)；
wherein: m is m wT In the proportioning of the batching theory, the water consumption of coarse and fine aggregates of concrete per cubic meter is in an absolute dry state; m is m sT In the proportion of the ingredients theory, the amount of sand in each cubic meter of concrete is in an absolute dry state.
The invention has the beneficial effects that the calculation method for dynamically adjusting the proportion parameters of the railway concrete batching theory changes the calculation of the continuous gradation of coarse aggregate broken stone and sand rate and water consumption from the original qualitative analysis to the quantitative analysis. The method can accurately express the influence of the change of the specific properties of the raw materials on the sand ratio of the concrete under different water-cement ratios, can calculate the actual batching theoretical mix proportion of the concrete more quickly and accurately when different batches of materials are used, and ensures that the cost and quality control more meet the actual application requirements of the optimal laboratory theoretical mix proportion. The full calculation process of coarse aggregate continuous grading, sand rate and water consumption introduces the dry tap volume rate index and correction coefficient of coarse aggregate broken stone of concrete, and systemizes the working performance of concrete with the consumption and properties of raw materials. The mechanical property and the durability of the concrete can be controlled while the working performance of the concrete is controlled in the concrete mixing production process. The method can rapidly cope with the influence of material change on the working performance of the concrete in actual production, and realizes the uniformity and stability of concrete products. The full calculation process greatly reduces the experience dependence on concrete testers, and can rapidly and accurately calculate the accurate batching theoretical mixing ratio suitable for different raw material performance differences according to the current situation that the performance fluctuation of the concrete raw material is large, thereby greatly reducing the test times and test period and improving the quality control and adjustment efficiency in the concrete production process. The invention can quantitatively reflect the concrete influence of the thickness degree of sand, the broken stone grading and the sand stone performance index change on the sand rate and the water consumption of the concrete mixing proportion, and can realize the rapid and accurate adjustment of the concrete meeting the requirements of working performance, mechanical performance and durability according to the performance indexes of the raw material parts.
Detailed Description
The full calculation method for dynamically adjusting the railway concrete batching theory proportioning parameters is described in detail below with reference to the accompanying drawings and the specific embodiments.
The invention relates to a full calculation method for dynamically adjusting the mixing proportion parameters of a railway concrete batching theory, which comprises the following steps:
clearly preferred laboratory theoretical mix test indicators include: concrete strength grade, designed slump, concrete air content, measured density, water-cement ratio and the like.
Example 1;
as an example, the well-defined preferred laboratory theoretical mix raw material types, the amount of material per cubic meter, raw material property parameters, include: cement density, fly ash density, mineral powder density, sand apparent density, sand saturation and dry density, sand water absorption, sand bulk density, sand grain grading and fineness modulus, stone apparent density, stone saturation and dry density, stone water absorption, stone bulk density, stone dry tap density and stone synthetic grading curve.
The test detects and obtains the performance parameters of the sand and crushed stone raw material part of the entering field, and the test comprises the following steps: sand apparent density, sand saturation and dry density, sand water absorption, sand bulk density, sand grain size distribution, fineness modulus and crushed stone single-grain size distribution.
According to the performance parameters detected by the inlet raw material test, fitting the inlet macadam synthetic grading with a preferable laboratory theoretical mixing proportion macadam synthetic grading curve to determine a mixing proportion, and detecting the performance parameters of the synthetic macadam such as apparent density, saturation and surface dry density, water absorption, dry tap density and bulk density.
The preferred laboratory theoretical mix is subjected to volumetric analysis based on the amount of material and air content per cubic meter in the preferred laboratory theoretical mix.
And calculating the dry compaction volume rate of the crushed stone with the preferable theoretical mixing ratio of the laboratory.
And determining a dry compaction volume rate correction coefficient of the broken stone in the batch theoretical mixing proportion according to the fineness modulus change of the entering sand, and adjusting the dry compaction volume rate of the broken stone in the batch theoretical mixing proportion.
The amount of crushed stone per cubic meter in the batch theory mix ratio is calculated. Based on the plasma volume method, the volume analysis is carried out on the batch theory mixing proportion. The volume of sand in the batch theoretical mix is calculated. And calculating the dosage of sand in the batch theory mixing proportion. The water usage per cubic meter of the batch theory mix proportion is calculated.
In order to make the technical scheme of the full calculation method for dynamically adjusting the blending proportion parameters of the railway concrete batching theory clear and easy to understand, the following is further described by combining an example of dynamically adjusting the blending proportion parameters of the railway concrete batching theory of a certain batch of the approach raw material C50 continuous beam.
Example 2;
as an example, a clear laboratory theoretical mix test index comprises: the indexes of concrete strength grade, designed slump, air content and the like are compiled into the test data sheet of table 1.
The theoretical mixing proportion of the raw materials in a laboratory is determined, the material consumption per cubic meter is determined, and the raw material property parameters comprise: cement density, fly ash density, mineral powder density, sand apparent density, sand saturation and dry density, sand bulk density, sand water absorption, sand bulk density, sand grain gradation and fineness modulus, stone apparent density, stone saturation and dry density, stone bulk density, stone water absorption, stone bulk density, stone dry tap density, stone synthesis gradation curve and the like are respectively imported into a test data table of table 1, a table 2, a table 4, and a table for calculating the theoretical mixing proportion of the ingredients. If the apparent density of sand, the dry density of sand saturation and the apparent density of broken stone and the dry density of broken stone have no actual measurement values, the method can be obtained according to calculation.
Example 3;
as an embodiment, the test detects and obtains the performance parameters of the sand and crushed stone raw material part of the approach of a certain batch, and the test comprises the following steps: the apparent density, saturation and dry density of sand, bulk density of sand, water absorption of sand, bulk density of sand, grain composition of sand, fineness modulus, etc. are compiled into the test data table of table 1. If the apparent density, saturation and dry density of the sand have no actual measurement values, the sand can be obtained according to calculation.
According to the single-size screening test result of a certain batch of incoming broken stone, fitting the synthetic grading of the incoming broken stone with the synthetic grading curve of broken stone with theoretical mixing proportion in a laboratory, determining a mixing proportion, and collecting the apparent density, saturated and dry density, bulk density, water absorption, dry tap density, bulk density performance parameters and the like of the synthetic broken stone into a test data table in table 1 and a synthetic grading table of the incoming broken stone in table 2. If the apparent density of the crushed stone, the saturation and the dry density of the crushed stone have no actual measurement values, the method can be obtained according to calculation.
According to the performance indexes such as the material consumption, the density and the like per cubic meter and the air content in the theoretical mixing proportion of the laboratory, the theoretical mixing proportion of the laboratory is subjected to volume analysis according to the volume analysis and the mixing theory mixing proportion calculation table of table 4, and the volume analysis is integrated into the volume analysis and the mixing theory mixing proportion calculation table of table 4.
Example 4;
as an example, the dry tap volume rate of the crushed stone in the batch theoretical mix proportion is calculated, the dry tap volume rate of the crushed stone in the batch theoretical mix proportion is determined according to the fineness modulus change of the entering sand, the correction coefficient of the dry tap volume rate of the crushed stone in the batch theoretical mix proportion is determined, the dry tap volume rate of the crushed stone in the batch theoretical mix proportion is adjusted, and the calculation table of the dry tap volume rate of the coarse aggregate in the batch theoretical mix proportion is summarized in table 3.
The amount of broken stone per cubic meter in the aggregate absolute state and the saturated surface dry state in the batching theory proportioning is calculated and is combined into a volumetric analysis and batching theory proportioning calculation table in Table 4.
Based on the plasma volume method, the volume analysis is carried out on the batch theoretical mixing proportion, and the volume analysis is summarized in a table 4 and a batch theoretical mixing proportion calculation table.
And calculating the volume of sand in the dry state of the aggregate saturated surface in the batching theory proportioning, and integrating the volume analysis and batching theory proportioning calculation table in the table 4.
The amount of sand used in the saturated and dry state of the aggregate in the batch theoretical mix is calculated and is compiled into the volumetric analysis and batch theoretical mix calculation table in Table 4.
The water consumption of the aggregate in the absolute state in the batch theoretical mix ratio is calculated and is integrated into the volume analysis and batch theoretical mix ratio calculation table in Table 4.
Table 1 test data sheet
TABLE 2 synthetic grading of incoming macadam
TABLE 3 calculation of the tap volume ratio of coarse aggregate with theoretical mix proportion of ingredients
TABLE 4 calculation of the volume analysis and the batch theory mix ratio
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According to the method, the batching theory mixing proportion parameters of the continuous beam C50 concrete of 15 batches of raw materials of a certain railway are dynamically adjusted based on quantitative analysis of a plasma volume method, and after implementation, the effect is displayed:
table 5 concrete performance and strength statistics for the formulation theoretical mix ratio
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As can be seen from the table, the strength grade of the concrete produced according to the railway concrete batching theory proportioning calculated by the invention meets the design requirement, and each index of the working performance of the freshly mixed concrete meets the design and construction requirements, so that the requirements of mechanical performance, working performance, durability and economy which meet the optimal laboratory theoretical proportioning can be quickly and accurately adjusted in the mixing production process according to part of the performances of raw materials.
The full calculation method for dynamically adjusting the railway concrete batching theory proportioning parameters can quantitatively reflect the change of the performance parameters such as the sand particle size and the like, has specific influence on the sand ratio of the concrete proportioning and the water consumption, can realize rapid and accurate adjustment and calculation of the railway concrete batching theory proportioning meeting the strength grade, the working performance and the durability requirements of the optimal laboratory theory proportioning according to the performance of the raw material detection part, and has certain practical significance.
Claims (10)
1. The full calculation method for dynamically adjusting the railway concrete batching theoretical mixing proportion parameters is characterized by comprising the following steps of 1, determining a preferable laboratory theoretical mixing proportion test index; step 2, determining the types, the amounts and the property parameters of the raw materials of the theoretical mixing proportion of the preferable laboratory; step 3, detecting and obtaining partial performance parameters of the sand and crushed stone raw materials entering the field through a test; step 4, detecting performance parameters according to a raw material test; step 5, carrying out volume analysis on the optimal theoretical mixing proportion of the laboratory; step 6, calculating the dry compaction volume rate of the broken stone of the theoretical mixing proportion of the optimized laboratory; step 7, determining a dry compaction volume rate correction coefficient of the crushed stone in the proportioning theory proportioning ratio, and adjusting the dry compaction volume rate; step 8, calculating the use amount of broken stone in the batch theory mixing proportion; step 9, carrying out volume analysis on the batch theory mixing ratio based on a plasma volume method; and step 10, calculating the volume and the dosage of sand and the dosage of water in the batch theoretical mixing ratio.
2. The method for dynamically adjusting the total calculation of the theoretical mix proportion parameters of the railway concrete ingredients according to claim 1, which is characterized by comprising the following specific steps:
in step 1, the clearly preferred laboratory theoretical mix test indexes include: the concrete strength grade, the designed slump, the concrete air content, the measured density and the water-cement ratio;
in step 2, the theoretical mix proportion raw material types of the laboratory, the material consumption per cubic meter and the raw material property parameters are determined, and the method comprises the following steps: cement density, fly ash density, mineral powder density, sand apparent density, sand saturation and dry density, sand bulk density, sand water absorption, sand bulk density, sand grain gradation and fineness modulus, stone apparent density, stone saturation and dry density, stone bulk density, stone water absorption, stone bulk density, stone dry tap density and stone synthetic gradation curve;
in step 3, the test detects and obtains the performance parameters of the sand and crushed stone raw material part of the entering field, including: sand apparent density, sand saturation surface dry density, sand bulk density, sand water absorption, sand bulk density, sand grain size distribution, fineness modulus and crushed stone single-grain size distribution;
step 4, according to the performance parameters of the advanced raw material test detection, fitting an advanced macadam synthesis grading curve with a preferable laboratory theoretical mixing proportion macadam synthesis grading curve to determine a mixing proportion, and detecting the performance parameters of the synthetic macadam apparent density, saturated surface dry density, bulk density, water absorption, dry tap density and bulk density;
in the step 5, according to the material consumption per cubic meter, the gas content and the raw material performance parameters in the optimal laboratory theoretical mixing proportion, carrying out volume analysis on the optimal laboratory theoretical mixing proportion;
in the step 7, according to the fineness modulus change of the entering sand, determining a dry tap volume rate correction coefficient of the broken stone in the blending proportion of the batching theory, and adjusting the dry tap volume rate of the broken stone in the blending proportion of the batching theory;
in step 8, the usage amount of broken stone per cubic meter in the batching theory mix proportion is calculated.
3. The method for dynamically adjusting the total calculation of the theoretical mix proportion parameters of the railway concrete ingredients according to claim 2, wherein step 2 further comprises: if the saturation and dry density of the sand have no measured values, the method is calculated according to the formula (1):
ρ sC ＝ρ sD ·(1+W xs /100) (1)；
wherein ρ is sC Saturation and dry density of sand in a preferred laboratory theoretical mix, ρ sD Bulk density, W, of sand in a preferred laboratory theoretical mix xs The water absorption rate of the sand in the theoretical mixing proportion of the preferable laboratory;
if there is no actual measurement of the apparent density of the sand, it is calculated according to formula (2):
wherein ρ is sA Apparent density ρ of sand in the preferred laboratory theoretical mix sD Bulk density, W, of sand in a preferred laboratory theoretical mix xs The water absorption rate of the sand in the theoretical mixing proportion of the preferable laboratory;
if the saturation and dry density of the crushed stone have no actual measurement value, calculating according to the formula (3):
ρ gC ＝ρ gD ·(1+W xg /100) (3)；
wherein ρ is gC Saturation and dry density of crushed stone in optimal laboratory theoretical mix ratio ρ gD Wool bulk density of crushed stone, W, in a preferred laboratory theoretical mix ratio xg The water absorption rate of crushed stone in the preferable theoretical mixing proportion of a laboratory;
if there is no measured value of the apparent density of the crushed stone, it is calculated according to the formula (4):
wherein: ρ gA Apparent density ρ of crushed stone in the preferred laboratory theoretical mix ratio gD Wool bulk density of crushed stone in preferred laboratory theoretical mix ratio，W xg The water absorption rate of the crushed stone in the preferable laboratory theoretical mixing ratio.
4. The method for dynamically adjusting the total calculation of the theoretical mix proportion parameters of railway concrete ingredients according to claim 3, wherein step 3 further comprises: if the saturation and dry density of the entering sand have no actual measurement values, calculating according to the formula (5):
ρ' sC ＝ρ' sD ·(1+W' xs /100) (5)；
wherein: ρ' sC Saturation and dry density of sand in proportion of ingredients theory, ρ' sD The bulk density, W 'of the sand in the proportion of the batching theory' xS The water absorption rate of the sand in the proportion of the ingredient theory,
if the apparent density of the entering sand has no measured value, calculating according to the formula (6):
wherein: ρ sA Apparent density ρ of sand in the proportion of the ingredients theory sD Bulk density of sand in proportion of batch theory, W xs The water absorption rate of the sand in the proportion of the batching theory is improved.
5. The method for dynamically adjusting the full calculation of the theoretical mix proportion parameters of the railway concrete formulation according to claim 2, wherein step 4 further comprises: adopting a trial algorithm when synthesizing continuous grading fitting of the approach coarse aggregate and continuous grading of the coarse aggregate according to a theoretical mix proportion of a preferable laboratory;
if the saturation and dry density of the incoming synthetic continuous graded crushed stone have no actual measurement value, the method is calculated according to the formula (7):
ρ' gC ＝ρ' gD ·(1+W' xg /100) (7)；
wherein ρ' gC Saturation and dry density of crushed stone in proportion of ingredients theory, ρ' gD Wool volume density of crushed stone in proportion of ingredients theory, W' xg In the formulation theory mix ratioWater absorption of crushed stone;
if the apparent density of the incoming synthetic continuous graded crushed stone has no measured value, calculating according to the formula (8):
wherein: ρ' gA Apparent density of crushed stone in proportion of ingredients theory, ρ' gD Wool volume density of crushed stone in proportion of ingredients theory, W' xg The water absorption rate of the crushed stone in the proportion of the ingredients theory is achieved.
6. The method for dynamically adjusting the full calculation of the theoretical mix proportion parameters of railway concrete ingredients according to claim 2, wherein step S5 further comprises: the preferred laboratory theoretical mix is subjected to a volumetric analysis under coarse and fine aggregate saturation and dry basis conditions, calculated according to equation (9):
wherein: m's' w In the optimal theoretical mixing proportion of a laboratory, the dosage of concrete water per cubic meter is under the condition of saturated surface dry state of coarse and fine aggregates; m is m c 、m F 、m K The concrete is the concrete per cubic meter in the optimal laboratory theoretical mixing proportion, and the dosage of cement, concrete fly ash and mineral powder is that; m's' s 、m' g 、m a 、α、ρ w 、ρ c 、ρ F 、ρ K 、ρ sC 、ρ gC 、ρ a In the preferred laboratory theoretical mix ratio: the amount of sand per cubic meter of concrete in saturated face dry state, the amount of broken stone per cubic meter of concrete in saturated face dry state, the amount of concrete admixture per cubic meter of concrete, the volume of air content per cubic meter of concrete, the density of water, the density of cement, the density of fly ash, the density of mineral powder, the saturated and dry density of sand, broken stoneThe saturation dry density of (c), the density of the admixture;
slurry volume analysis, calculated according to formula (10):
the preferred laboratory theoretical mix ratio, the amount of crushed stone in saturated face dry state per cubic meter of concrete, is calculated according to formula (11):
m' g ＝m g ·(1+W xg /100) (11)；
wherein m is g In the preferable theoretical mixing proportion of the laboratory, the dosage of broken stone in each cubic meter of concrete in the absolute state is W xg In the preferable theoretical mixing proportion of the laboratory, the water absorption rate of the crushed stone;
the preferred laboratory theoretical mix, the amount of sand saturated surface dry per cubic meter of concrete, is calculated according to formula (12):
m' s ＝m s ·(1+W xs /100) (12)；
wherein m is s In the preferable theoretical mixing proportion of the laboratory, the amount of the sand in the concrete per cubic meter in the absolute dry state is W xs In the preferable theoretical mixing proportion of the laboratory, the water absorption rate of the sand;
in the preferred laboratory theoretical mix, the water consumption per cubic meter of concrete under the condition of saturated surface dry state of coarse and fine aggregates is calculated according to the formula (13):
m' w ＝m w -m s ·W xs /100-m g ·W xg /100 (13)；
wherein m is w In the preferable theoretical mixing proportion of the laboratory, the dosage of concrete water per cubic meter is under the condition that coarse and fine aggregates are in a dead dry state.
7. The method for dynamically adjusting the full calculation of the theoretical mix proportion parameters of the railway concrete formulation according to claim 2, wherein step 6 further comprises: calculating the dry compaction volume fraction of the crushed stone of the preferred laboratory theoretical mix ratio according to formula (14):
wherein: v (V) L In the preferable theoretical mixing proportion of the laboratory, the dry compaction volume rate of broken stone in each cubic meter of concrete; ρ gB In the preferable theoretical mixing proportion of the laboratory, the dry tap density of the crushed stone;
step S7 further includes: in the determined proportioning theory, the correction coefficient of the dry compaction volume rate of the broken stone in each cubic meter of concrete is calculated according to the formula (15):
V X ＝0.1×(M x -M' x ) (15)；
wherein: v (V) X The correction coefficient of the dry compaction volume rate of broken stone in each cubic meter of concrete in the proportioning theory; m is M x In the preferable theoretical mixing proportion of the laboratory, the fineness modulus of the sand; m's' x In the proportion of the ingredient theory, the fineness modulus of the sand;
determining the dry tap volume rate of the crushed stone in the batch theoretical mixing ratio, and calculating according to a formula (16):
V T ＝V L +V X (16)；
wherein: v (V) T In the proportioning theory, the dry compaction volume rate of broken stone in each cubic meter of concrete.
8. The method for dynamically adjusting the full calculation of the theoretical mix parameters of railway concrete ingredients according to claim 2, wherein step 8 further comprises: calculating the dosage of each cubic meter of concrete broken stone in the absolute state in the batching theory mixing ratio, and calculating according to a formula (17):
m gT ＝V T ·ρ' gB (17)；
wherein: m is m gT In the proportion of the ingredients theory, the dosage per cubic meter of concrete broken stone in the absolute state is ρ' gB In the proportion of the ingredients theory, the dry tap density of the crushed stone;
calculating the dosage of the concrete broken stone saturated face dry state per cubic meter in the mixing proportion of the batching theory, and calculating according to a formula (18):
m' gT ＝m gT ·(1+W' xg /100) (18)；
wherein: m's' gT In the mixing proportion of the ingredients theory, the dosage of the concrete broken stone in the saturated face dry state per cubic meter is calculated; m is m gT In the proportion of the ingredients theory, the dosage of the concrete broken stone in the absolute dry state is calculated per cubic meter; w'. xg In the proportion of the ingredients theory, the water absorption rate of the crushed stone is improved.
9. The method for dynamically adjusting the full calculation of the theoretical mix parameters of railway concrete ingredients according to claim 2, wherein step 9 further comprises: the theoretical mix of ingredients is subjected to volumetric analysis and calculated according to formula (19):
wherein m' sT In the proportion of the ingredients theory, the amount of sand per cubic meter of concrete in a saturated face dry state is used; m's' gT In the proportion of the ingredients theory, the amount of broken stone per cubic meter of concrete in a saturated face dry state is used.
10. The method for dynamically adjusting the full calculation of the theoretical mix proportion parameters of railway concrete ingredients according to claim 2, wherein step S10 further comprises: determining the volume of the sand in the saturated surface dry state in the batch theoretical mixing ratio, and calculating according to a formula (21):
wherein: v'. s In the theoretical mixing proportion of ingredients, the volume of the sand in a saturated surface dry state is V, and the volume of the slurry in the theoretical mixing proportion of a preferable laboratory;
calculating the dosage of sand in a saturated face dry state in each cubic meter of concrete in the batching theory mixing ratio, and calculating according to a formula (22):
m' sT ＝V' s ·ρ' sC (22)；
wherein: m's' sT In the proportion of the batching theory, the amount of sand in each cubic meter of concrete in a saturated face dry state is used;
in the calculation of the batching theory mix ratio, the amount of sand in the concrete per cubic meter in the absolute state is calculated according to the formula (23):
wherein: m is m sT In the proportion of the batching theory, the amount of sand in each cubic meter of concrete in a dry state is used; w'. xs In the proportion of the ingredients theory, the water absorption of the sand is increased;
calculating the water consumption of a batch theoretical mixing ratio, wherein the water consumption of the batch theoretical mixing ratio is the same as the water consumption of a preferable laboratory theoretical mixing ratio under the saturated surface dry state of coarse and fine aggregates based on a plasma volume method, and calculating according to a formula (24):
m' wT ＝m' w ＝m w -m s ·W xs /100-m g ·W xg /100 (24)；
wherein: m's' wT In the mixing proportion of the batching theory, the dosage of concrete water per cubic meter is under the condition of saturated surface dry state of coarse and fine aggregates; m's' w In the optimal theoretical mixing proportion of a laboratory, the dosage of concrete water per cubic meter is under the condition of saturated surface dry state of coarse and fine aggregates;
in the determined batching theory mixing proportion, the water consumption of the coarse and fine aggregates per cubic meter of concrete is calculated according to the formula (25):
m wT ＝m' wT +m sT ·W' xs /100+m gT ·W' xg /100 (25)；
wherein: m is m wT In the mixing proportion of the ingredients theory, each cubic meter is mixedThe water consumption of the coarse and fine aggregates of the concrete in an absolute state; m is m sT In the proportion of the ingredients theory, the amount of sand in each cubic meter of concrete is in an absolute dry state.
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