CN114878747A - Method for determining dosage of cementing material - Google Patents
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- CN114878747A CN114878747A CN202210438005.7A CN202210438005A CN114878747A CN 114878747 A CN114878747 A CN 114878747A CN 202210438005 A CN202210438005 A CN 202210438005A CN 114878747 A CN114878747 A CN 114878747A
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- 239000000463 material Substances 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000004519 manufacturing process Methods 0.000 claims abstract description 45
- 239000000203 mixture Substances 0.000 claims abstract description 34
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004568 cement Substances 0.000 claims description 26
- 238000004364 calculation method Methods 0.000 claims description 9
- 238000001514 detection method Methods 0.000 claims description 9
- 238000005303 weighing Methods 0.000 claims description 8
- 238000010276 construction Methods 0.000 claims description 7
- 238000012360 testing method Methods 0.000 claims description 7
- 238000007599 discharging Methods 0.000 claims description 4
- 238000002360 preparation method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000004575 stone Substances 0.000 claims description 2
- 238000005516 engineering process Methods 0.000 claims 1
- 238000010998 test method Methods 0.000 claims 1
- 239000002910 solid waste Substances 0.000 abstract description 11
- 238000004448 titration Methods 0.000 abstract description 6
- 230000002349 favourable effect Effects 0.000 abstract description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 description 1
- 235000017491 Bambusa tulda Nutrition 0.000 description 1
- 241001330002 Bambuseae Species 0.000 description 1
- 235000008733 Citrus aurantifolia Nutrition 0.000 description 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 description 1
- 235000011941 Tilia x europaea Nutrition 0.000 description 1
- 239000011425 bamboo Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 239000004571 lime Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
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- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W30/00—Technologies for solid waste management
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Abstract
The invention belongs to the technical field of dose measuring methods, and particularly relates to a method for determining the dose of a cementing material. The method comprises the following specific steps: preparing in an early stage; pre-calibrating the dosage of the cementing material, and detecting the water content of aggregate samples; calibrating and adjusting the cementing material in the production process; determining the dosage of the cementing material; and detecting the water content of the mixture, and rechecking the dosage of the mixture cementing material. The method is simple, convenient and quick, has stronger timeliness, and further improves the working efficiency and the working quality. The method can measure the dosage of the cementing material in the mixture produced by the water-stable mixing station, is particularly suitable for the solid waste base cementing material stabilized macadam mixture of which the dosage of the cementing material cannot be accurately determined by a titration method, and is favorable for popularization and application of the solid waste base cementing material.
Description
Technical Field
The invention belongs to the technical field of dose measuring methods, and particularly relates to a method for determining the dose of a cementing material.
Background
The accurate determination of the dosage of the cementing material has very important guiding significance for the construction of highway engineering base courses. At present, the domestic engineering cement or lime dosage measuring method mainly adopts a method specified by JTG E51-2009 test Specification for inorganic binder stabilizing materials for highway engineering T0809-2009, the time from material taking to titration completion is about 20min according to test operation, the time is 540T/h, 180T of discharged materials are completed in the process of waiting for titration results, and certain delay exists. Moreover, with the national enhancement of environmental requirements, the recycling of solid waste materials is advocated, and the research and application of solid waste based gelling materials such as bamboo shoots in spring after rain are carried out all over the country. In engineering practice, a great difficulty that restricts the popularization and application of the solid waste base gel material is found to be that a quick and effective method cannot be found to determine the dosage of the gel material.
Disclosure of Invention
In order to solve the problems in the prior art, the invention provides a method for determining the dosage of a cementing material in a mixture discharged from a water-stable mixing station, and particularly relates to a stable granular material which is similar to a solid waste-based cementing material, a red mud-based cementing material and the like and cannot accurately determine the dosage of the cementing material through a titration method. The method is simple, convenient and quick, can detect the dosage of the cementing material in the mixture in real time, finds out the deviation of the result in time, is convenient for correcting the deviation of the cementing material of the mixture in time, and achieves the effect of ensuring the gradation control of the mixture.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for determining the dosage of a cementing material comprises the following specific steps:
(1) early preparation:
before construction, each hopper and a cementing material weighing system of a mixing station are calibrated, the accuracy of the weighing system is ensured, flow calibration is carried out on each grade of aggregate, and the mixture production mixing ratio is determined through tests.
(2) Pre-calibration of the dosage of the cementing material:
calibrating the dosage of the cementing material at least for 3 points, wherein the full range of the cementing material feeding frequency converter of the mixing station is f, and at least for 0.2f, 0.4f and 0.6f, calibration is needed;
firstly, setting the frequency of a cementing material to 0.2f, starting a cementing material feeding system to feed materials, starting timing at the same time, and receiving the materials by woven bags at a feeding hole;
stopping discharging the cementing material, stopping timing, and reading the time t 1 (discharge time t according to engineering experience 1 Not less than 10s), weighing the weight m of the placed gel material j (kg) according to formula y 1 ＝(m j /t 1 ) 3600/1000, calculating the cement supply y corresponding to the frequency of 0.2f 1 (t/h)；
Calibrating and calculating the flow y of the cementing material corresponding to 0.4f according to the same operation mode 2 (t/h), cement flow rate y of 0.6f 3 (t/h)；
With 0.2f, 0.4f, 0.6f as the abscissa, the corresponding y 1 、y 2 、y 3 Drawing a relation graph of the cementing material frequency and the cementing material supply quantity for the ordinate, and making a fitted curve y of the graph as a 1 x+b 1 。
(3) Aggregate sampling water content detection:
replacing surface samples with aggregates of various grades in a stock yard of a mixing station, and detecting the water content according to relevant provisions of aggregate test regulations for highway engineering (JTG E42-2005);
taking conventional four grades of aggregate with the thickness of 20-30 mm, 10-20 mm, 5-10 mm and 0-5 mm as examples (the same below), the measured water content is respectively omega 1 、ω 2 、ω 3 、ω 4 ；
(4) Aggregate proportion of each grade:
designing the mixture mixing proportion according to relevant regulations of highway pavement base course construction technical rules (JTG/T F20-2015);
determining the water-free mass percentage of each grade of aggregate as p 1 :p 2 :p 3 :p 4 (wherein, p is 1 +p 2+ p 3+ p 4 ＝100％)。
(5) Adjusting the metering frequency of the cementing material in the production process:
in normal production, when the mixing station is set to a production rate of T per hour 1 (T/h) wherein T 1 Including the weight of aggregate (water-containing weight) and the weight of cementing material in four grades;
determining the dosage of the mixed material cementing material as e by assuming the production mixing proportion 1 (%), the amount of the cementing material added per hour was
Calculating the cement material as
In time, the production frequency f of the cementitious material of the mixing station 1 ；
Will f is 1 When in production, the initial setting frequency of the cementing material is set;
in the production process, in order to ensure the calculation accuracy and timeliness, the dosage of the cementing material is calculated once every 2 vehicles;
reading the weight of each grade of aggregate at the moment through an operation system screen of the mixing station, wherein the weight is 20-30 mm and m is 12 10 to 20mm is m 22 5-10 mm is m 32 0 to 5mm is m 42 Weight m of cementitious Material j2 ；
Wherein m is 12 1 in the subscript represents the stone specification of 20-30 mm, 2 in the subscript represents the discharge vehicle number of the mixture, and so on 22 、m 32 、m 42 The significance of subscript;
due to m 12 、m 22 、m 32 、m 42 Including the water content of the aggregate in each grade, the water content needs to be subtracted when calculating the dosage of the cementing material. Aggregate total weight after deduction of water mass
According to e 2 ＝m j2 /M General 2 100 calculate the amount of cement e in the mixture of the first two vehicles 2 ；
Comparison e 2 And e 1 The value:
if the difference value of the two is not more than +/-0.1, continuously detecting the dosages of other vehicle cementing materials according to the step 4.
If the difference between the two exceeds +/-0.1, then
Recalculating the production frequency of the cementing material of the mixing station;
setting the production frequency of the cementing material of the mixing station from f 1 Is changed into f 2 ；
Repeating the operation (5) until the production frequency f of the cement of the mixing station n The detection value of the cementing material corresponding to the mixture
Wherein the index n represents the nth calculation, M Total 2n 、M Total 2(n-1) See M in operation (5) General 2 The calculation process of (2).
Determination of the dosage of the gelling material:
continuously checking the production frequency of the cementitious material determined in operation (5) according to operation (5); up to the production frequency f n Corresponding detected value e n 、e n+1 、e n+2 Result satisfied e 3 times in succession 1 Up to + -0.1, at which point the production frequency f is assumed n Corresponding cement dosage of e 1 。
Advantageous effects
The invention discloses a method for determining the dosage of a cementing material, which has the beneficial effects that: the method is simple, convenient and quick, has stronger timeliness, and further improves the working efficiency and the working quality. The method can measure the dosage of the cementing material in the mixture produced by the water-stable mixing station, is particularly suitable for the solid waste base cementing material stabilized macadam mixture of which the dosage of the cementing material cannot be accurately determined by a titration method, and is favorable for popularization and application of the solid waste base cementing material.
Drawings
FIG. 1: gelling material frequency-gelling material supply quantity relation diagram.
Detailed Description
Hereinafter, the present invention will be described in detail. Before the description is made, it should be understood that the terms used in the present specification and the appended claims should not be construed as limited to general and dictionary meanings, but interpreted based on the meanings and concepts corresponding to technical aspects of the present invention on the basis of the principle that the inventor is allowed to define terms appropriately for the best explanation. Accordingly, the description proposed herein is just a preferable example for the purpose of illustrations only, not intended to limit the scope of the invention, so it should be understood that other equivalents and modifications could be made thereto without departing from the spirit and scope of the invention.
The following examples are given by way of illustration of embodiments of the invention and are not to be construed as limiting the invention, and it will be understood by those skilled in the art that modifications may be made without departing from the spirit and scope of the invention. Unless otherwise specified, reagents and equipment used in the following examples are commercially available products.
Example 1
A method for determining the dosage of a cementing material comprises the following specific steps:
(1) early preparation:
before construction, calibrating 4 hoppers and cementing material weighing systems used for production, calibrating the flow of each grade of aggregate blanking belt, and carrying out proportioning design on the solid waste base cementing material stabilized macadam;
(2) pre-calibration of the dosage of the cementing material:
in the adopted water-stable mixing station of the square-round 800 type, the metering full frequency f of the cementing material is 50Hz, and the frequencies of 10Hz, 20Hz and 30Hz are respectively calibrated according to requirements;
setting the metering frequency of the cementing material to be 10Hz, starting a cementing material feeding system to discharge materials, starting timing, and receiving materials at a cementing material discharging port by using a woven bag;
closing the cementing material discharging system, simultaneously stopping timing, reading the timing to be 15.94s, and weighing the material receiving mass to be 77.535 kg; according to the formula y 1 (77.535/15.94) · 3600/1000 ═ 17.511t/h, the calculated frequency of 10Hz corresponds to the cement supply of 17.511 (t/h);
according to the operation mode, the supply amount of the cementing material corresponding to the calculated frequency of 20Hz is 27.9895(t/h), the supply amount of the cementing material corresponding to the calculated frequency of 30Hz is 35.542(t/h)
Taking 10Hz, 20Hz and 30Hz as abscissas, and corresponding cementing material supply amounts of 17.511t/h, 27.9895 t/h and 35.542t/h as ordinates, drawing a relationship graph (shown in figure 1) of cementing material frequency and cementing material supply amount, and making a graph fitting curve equation of which y is 0.901x + 8.951;
(3) aggregate sampling water content detection:
performing moisture content detection on four grades of aggregates of 20-30 mm, 10-20 mm, 5-10 mm and 0-5 mm adopted by the mixture according to relevant regulations of aggregate test regulations for highway engineering (JTG E42-2005);
the moisture content of the four grades of aggregates is respectively 0.3%, 0.5%, 0.6% and 1.3%;
(4) aggregate proportion of each grade:
designing the mixture mixing proportion according to relevant regulations of highway pavement base course construction technical rules (JTG/T F20-2015);
and determining the mass percent of the water-free aggregate of each grade to be 18:38:15:29 respectively.
(5) Adjusting the metering frequency of the cementing material in the production process:
the mixing station is set to produce 480(t/h) per hour, wherein 480t/h comprises the weight of aggregate (water-containing weight) and the weight of cementing material in four grades;
the mixing proportion determines the dosage of the mixture cementing material to be 5.5%, and the adding amount of the cementing material per hour is
According to the fitted curve determined in the step (3), when the cement material is calculated to be 24.856t/h, the cement material production frequency f of the mixing station is (24.856-8.951)/0.901 is 17.65 Hz;
when 17.65Hz is used for production, the initial setting frequency of the cementing material is set;
in the production process, in order to ensure the calculation accuracy and timeliness, the dosage of the cementing material is calculated once every 2 vehicles;
reading the weight of each grade of aggregate, namely 18.617t for 20-30 mm, 39.302t for 10-20 mm, 15.514t for 5-10 mm, 29.994t for 0-5 mm and 5.273t for the weight of the cementing material through an operation system screen of the mixing station;
due to the water-containing mass of the aggregate in each grade, the water needs to be subtracted when calculating the cement dosage. Aggregate total weight after deduction of water mass
comparison 5.1 exceeds 5.5 plus or minus 0.1;
the difference between the two exceeds +/-0.1 according to
Recalculating the production frequency of the cementing material of the mixing station;
the production frequency set value of the cementing material of the mixing station is changed from 17.65Hz to 19.03 Hz;
repeating the step (5), and when the production frequency of the cementing material is 19.03Hz, detecting the cementing material detection value of the mixture of the 3 rd and 4 th vehicles
Comparison 5.9 exceeds 5.5 plus or minus 0.1;
the difference between the two exceeds +/-0.1 according to
Recalculating the production frequency of the cementing material of the mixing station;
changing the production frequency set value of the cementing material of the mixing station from 19.03Hz to 18.69 Hz;
repeating the step (5), and when the production frequency of the cementing material is 18.69Hz, detecting the cementing material detection value of the mixture of the 5 th and the 6 th vehicles
Comparison 5.5 is not more than 5.5 +/-0.1;
the production frequency of the cementing material is not changed at 18.69Hz, the detection values of the cementing material of the mixture of the vehicles 7 and 8 and the vehicles 9 and 10 are continuously detected and calculated, and e is obtained through calculation 4 ＝5.6％、e 5 ＝5.4％；
Three consecutive measurements e at a cement production frequency of 18.69Hz 3 、e 4 、e 5 The production ratio is 5.5 +/-0.1;
the yield is determined to be 480t/h when the mixture is mixed and produced, and the production frequency of the cementing material is set to be 18.69Hz when the dosage of the cementing material is 5.5 percent.
The method is simple, convenient and quick, has stronger timeliness, and further improves the working efficiency and the working quality. The method can measure the dosage of the cementing material in the mixture produced by the water-stable mixing station, is particularly suitable for the solid waste base cementing material stabilized macadam mixture of which the dosage of the cementing material cannot be accurately determined by a titration method, and is favorable for popularization and application of the solid waste base cementing material.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions.
Claims (8)
1. A method of determining the dosage of a cementitious material, comprising the steps of:
(1) early preparation: before construction, calibrating each hopper and a cementing material weighing system of a mixing station, ensuring the accuracy of the weighing systems, calibrating the flow of each grade of aggregate, and determining the production mix proportion of a mixture through a test;
(2) pre-calibration of the dosage of the cementing material: calibrating the dosage of the cementing material at least for 3 points, wherein the full range of the cementing material feeding frequency converter of the mixing station is f, and at least for 0.2f, 0.4f and 0.6f, calibration is needed;
(3) aggregate sampling water content detection: replacing a surface sample with each grade of aggregate in a stock yard of a mixing station, and detecting the water content according to the regulation of road engineering aggregate test regulations (JTG E42-2005);
(4) determining aggregate proportion of each grade;
(5) adjusting the metering frequency of the cementing material in the production process;
(6) the dosage of the gelling material is determined.
2. The method for determining the amount of the cementing material according to the claim 1, wherein in the step (2), the concrete method for pre-calibrating the amount of the cementing material is as follows:
firstly, setting the frequency of a cementing material to 0.2f, starting a cementing material feeding system to feed materials, starting timing at the same time, and receiving the materials by woven bags at a feeding hole; stopping discharging the cementing material, stopping timing, and reading the time t 1 (discharge time t according to engineering experience 1 Not less than 10s), weighing the weight m of the placed gel material j (kg) according to formula y 1 ＝(m j /t 1 ) 3600/1000, calculating the cement supply y corresponding to the frequency of 0.2f 1 (t/h)；
The flow rate y of the cement corresponding to 0.4f was calculated in the same manner 2 (t/h), flow of gelled material corresponding to 0.6fQuantity y 3 (t/h)；
With 0.2f, 0.4f, 0.6f as the abscissa, the corresponding y 1 、y 2 、y 3 Drawing a relation graph of the cementing material frequency and the cementing material supply quantity for the ordinate, and making a fitted curve y of the graph as a 1 x+b 1 。
3. The method for determining the dosage of the cementing material according to claim 1, wherein in the step (3), the water content of the four grades of aggregates of 20-30 mm, 10-20 mm, 5-10 mm and 0-5 mm adopted in the mixture is detected according to the relevant provisions of aggregate test procedures for highway engineering (JTG E42-2005), and the results of the water content are respectively omega 1 、ω 2 、ω 3 、ω 4 。
4. The cement dosage determination method according to claim 1, wherein in the step (4), the method for determining the aggregate proportion of each grade is as follows: designing the mixture proportion according to the rules of the Highway pavement base course construction technology (JTG/T F20-2015), and determining the mass percent of the water-free aggregate of each grade as p 1 :p 2 :p 3 :p 4 Wherein p is 1 +p 2 +p 3 +p 4 ＝100％。
5. The cement dosage determination method according to claim 4, wherein in the step (5), the method for adjusting the cement metering frequency in the production process comprises the following steps:
in normal production, when the mixing station is set to a production rate of T per hour 1 (t/h)，T 1 Including the weight of aggregate (water content weight) and the weight of the cement in four grades, the cement dosage of the mixture is determined as e on the assumption of the production mix proportion 1 (%), the amount of the cementing material added per hour is
Calculating the cementing material according to the fitted curve determined in the step (3)Is composed of
In time, the production frequency f of the cementitious material of the mixing station 1 A 1 is to f 1 The initial setting frequency of the cementing material during production;
in the production process, in order to ensure the calculation accuracy and timeliness, the dosage of the cementing material is calculated once every 2 vehicles, and the weight of 20-30 mm of each grade of aggregate is read as m through the screen of the operation system of the mixing station 12 10 to 20mm is m 22 5-10 mm is m 32 0 to 5mm is m 42 Weight m of cementitious Material j2 Wherein m is 12 1 in the subscript represents the stone specification of 20-30 mm, 2 in the subscript represents the discharge vehicle number of the mixture, and so on 22 、m 32 、m 42 The significance of subscript;
due to m 12 、m 22 、m 32 、m 42 Including the water content mass of each grade of aggregate, the water content is required to be deducted when calculating the dosage of the cementing material, and the total weight of the aggregate after deducting the water content mass
According to e 2 ＝m j2 /M General 2 100 calculate the amount of cement e in the mixture of the first two vehicles 2 Comparison e 2 And e 1 And determining the next operation according to the difference value of the two values.
6. Cement dose determination method according to claim 5, characterized in that said comparison e 2 And e 1 The difference result of the values includes:
if the difference between the two is not more than +/-0.1, continuously detecting the dosages of other vehicle cementing materials according to the step (4);
if the difference between the two exceeds + -0.1, follow
Recalculating the production frequency of the cementing material of the mixing station.
7. The cement dose determination method according to claim 6, wherein the recalculation method is: setting the production frequency of the cementing material of the mixing station from f 1 Is changed into f 2 (ii) a Then, repeating the operation of step (5) until the cement production frequency f of the mixing station n The detection value of the cementing material corresponding to the mixture
Wherein the index n represents the nth calculation, M Total 2n 、M Total 2(n-1) The calculation process is shown in step (5) for M General 2 The calculation process of (2).
8. The cement dose determination method according to claim 7, wherein in step (6), the concrete method for determining the cement dose is as follows: continuously checking the production frequency of the cementitious material determined in step (5) according to step (5) until the production frequency f n Corresponding detected value e n 、e n+1 、e n+2 Result satisfied e 3 times in succession 1 Up to + -0.1, at which point the production frequency f is assumed n Corresponding cement dosage of e 1 。
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