CN106777535B - Alkali-activated recycled concrete mix proportion design method and system - Google Patents
Alkali-activated recycled concrete mix proportion design method and system Download PDFInfo
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- 239000003513 alkali Substances 0.000 title claims abstract description 153
- 239000004567 concrete Substances 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 44
- 239000000203 mixture Substances 0.000 title claims description 33
- 238000013461 design Methods 0.000 title claims description 22
- 239000007787 solid Substances 0.000 claims abstract description 68
- 239000004576 sand Substances 0.000 claims abstract description 45
- 239000004568 cement Substances 0.000 claims abstract description 30
- 238000004364 calculation method Methods 0.000 claims abstract description 25
- 239000004570 mortar (masonry) Substances 0.000 claims abstract description 10
- 210000000988 bone and bone Anatomy 0.000 claims abstract description 9
- 239000002002 slurry Substances 0.000 claims abstract description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 27
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 20
- 239000011707 mineral Substances 0.000 claims description 20
- 239000000843 powder Substances 0.000 claims description 20
- 239000011230 binding agent Substances 0.000 claims description 19
- 239000010881 fly ash Substances 0.000 claims description 12
- 239000003292 glue Substances 0.000 claims description 9
- 238000012360 testing method Methods 0.000 claims description 7
- 238000007906 compression Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 14
- 230000009286 beneficial effect Effects 0.000 abstract description 7
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000010276 construction Methods 0.000 description 6
- 239000000463 material Substances 0.000 description 6
- 239000004575 stone Substances 0.000 description 5
- 239000010883 coal ash Substances 0.000 description 4
- 235000019353 potassium silicate Nutrition 0.000 description 4
- 238000002360 preparation method Methods 0.000 description 4
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 4
- 238000011161 development Methods 0.000 description 3
- 239000011398 Portland cement Substances 0.000 description 2
- 239000002585 base Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 238000010521 absorption reaction Methods 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000740 bleeding effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 239000002440 industrial waste Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000005204 segregation Methods 0.000 description 1
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- 238000003756 stirring Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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Abstract
The invention disclosesThe invention discloses a method and a system for designing the mixing proportion of alkali-activated recycled concrete, wherein the method comprises the following steps: determining the target compressive strength according to the performance requirements of an application scene, and selecting a corresponding alkali-cement ratio and a corresponding strength standard deviation; according to fcu,0≥fcu,k+1.645σkTo obtain fcu,0A specific numerical value; obtaining corresponding regression coefficients and values of the compressive strength of the mortar 28d according to the alkali-cement ratio, and calculating to obtain the water-solid ratio according to the alkali-cement ratio, the trial strength, the regression coefficients and the compressive strength of the mortar 28 d; and calculating the content of each component by using a bone slurry mass ratio method according to the alkali-cement ratio, the water-solid ratio, the bone slurry mass ratio and the sand ratio. The invention has the beneficial effects that: the alkali-activated concrete using the recycled aggregate fully recycles waste resources, is beneficial to environmental protection, obtains a calculation model suitable for the alkali-activated recycled concrete through the water-solid ratio, calculates according to the actual mass relationship among the concrete components, and is more accurate in the obtained mixing ratio and wider in application range.
Description
Technical Field
The invention relates to the field of concrete preparation, in particular to a method and a system for designing the mixing proportion of alkali-activated recycled concrete.
Background
Concrete is a general term for engineering composite materials in which aggregate is cemented into a whole by a cementing material. The term concrete generally refers to cement as a cementing material and sand and stone as aggregate; the cement concrete, also called as common concrete, is obtained by mixing with water (which may contain additives and admixtures) according to a certain proportion and stirring, and is widely applied to civil engineering. The regenerated concrete is prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded waste concrete blocks with a grading agent according to a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand stones and the like, and adding cement, water and the like. The recycled concrete can be combined with the aggregate in the following situations: all aggregates are recycled aggregates; the coarse aggregate is recycled aggregate, and the fine aggregate is natural sand; the coarse aggregate is natural broken stone or pebble, and the fine aggregate is recycled aggregate; the recycled aggregate replaces part of coarse aggregate or fine aggregate.
With the continuous development of concrete technology, people continuously deepen the understanding of concrete as a building material, and the concepts of considering the sustainable development design concept and protecting the ecological environment are increasingly deepened. However, the large amount of conventional portland cement consumes a lot of natural resources and emits a lot of gas during and after the preparation process. According to recent research, the cement industry alone produces 1.8Gt of emissions worldwide each year, which accounts for approximately 5-7% of the total emissions in the human production process. The data show that 0.8t emissions are produced per ton of cement. Therefore, recycled concrete prepared from industrial waste residues and recycled aggregates from construction waste is of great significance. The regenerated concrete is prepared by crushing, cleaning and grading waste concrete blocks, mixing the crushed, cleaned and graded waste concrete blocks with a grading agent according to a certain proportion, partially or completely replacing natural aggregates (mainly coarse aggregates) such as sand stones and the like, and adding cement, water and the like. The recycled concrete can be combined with the aggregate in the following situations: all aggregates are recycled aggregates; the coarse aggregate is recycled aggregate, and the fine aggregate is natural sand; the coarse aggregate is natural broken stone or pebble, and the fine aggregate is recycled aggregate; the recycled aggregate replaces part of coarse aggregate or fine aggregate. Compared with the traditional Portland cement concrete, the alkali-activated recycled concrete can effectively solve the problem of treatment of a large amount of construction waste, and can realize recycling of the waste, thereby saving natural resources and taking ecological and environmental benefits into consideration. In addition, the concrete utilizes the alkali-activated cementing material to replace the traditional cement glue material, and can greatly reduce the carbon emission caused by the use of the cement cementing material in the preparation process of the concrete, thereby further embodying the idea of green development.
Although various studies of alkali-activated concrete have been made by various researchers, and many methods for designing a mix ratio have been proposed, reports on the preparation of alkali-activated concrete using a completely recycled coarse aggregate instead of a natural aggregate have been relatively rare. The existing mix proportion design scheme has the problem that the strength and the durability of a final product cannot be considered at the same time, or the mix proportion is calculated by simply setting the concrete density to a constant value. In addition, ObadaKayali points out that the urgent need for the engineering application of alkali-activated concrete is to provide a suitable, simple and practical mix proportion design method.
Disclosure of Invention
The invention mainly aims to provide a method and a system for designing the mixing proportion of alkali-activated recycled concrete, which are used for calculating according to the actual relationship among all components of the concrete, have wider application range and obtain accurate mixing proportion.
The invention provides a design method of alkali-activated recycled concrete mix proportion, which comprises the following steps:
determining the target compressive strength f of the target alkali-activated recycled concrete according to the performance requirements of the application scenecu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthk；
According to fcu,0≥fcu,k+1.645σkTo obtain fcu,0Specific numerical values, wherein fcu,0The strength of the alkali-activated recycled concrete is trial-prepared;
obtaining corresponding regression coefficient α according to the alkali-glue ratio A/Ba、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu,0Regression coefficient αa、αbCompressive strength f of sand 28dbCalculating to obtain a water-solid ratio W/GPS;
and calculating the content of each component in the alkali-activated recycled concrete by using a slurry-bone mass ratio method according to the alkali-cement ratio A/B, the water-solid ratio W/GPS, the slurry-bone mass ratio and the sand rate.
Further, determining the target compressive strength f of the alkali-activated recycled concrete according to the performance requirements of specific application scenescu,kAnd before the step of selecting a proper alkali-to-glue ratio A/B and a proper standard deviation sigma of strength, the method comprises the following steps:
according to the formula
Calculating to obtain different compressive strengths f of the alkali-activated recycled concretecuCorresponding standard deviation sigma of strength, and the compressive strength fcuThe numerical values and the intensity standard deviations σ corresponding thereto are stored in a standard deviation database in one-to-one correspondence.
Further, determining the target compressive strength f of the alkali-activated recycled concrete according to the performance requirements of specific application scenescu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthkThe method comprises the following steps:
the compressive strength f of the targetcu,kCompressive strength f in the sum standard deviation databasecuMatching the data to find the target compressive strength fcu，kNumerical value corresponding target intensity standard deviation sigmakNumerical values.
Further, according to the alkali-glue ratio A/B, a corresponding regression coefficient α is obtaineda、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu,0Regression coefficient αa、αbCompressive strength f of sand 28dbAnd calculating to obtain the water-solid ratio W/GPS, comprising the following steps:
by the formula
And calculating to obtain the water-solid ratio W/GPS.
Further, the step of calculating the content of each component in the alkali-activated recycled concrete by using a slurry-bone mass ratio method according to the alkali-cement ratio A/B, the water-solid ratio W/GPS, the slurry-bone mass ratio and the sand ratio comprises the following steps:
the calculations were performed using the following relationship equation,
the gelling component is used in the mass fraction of alkali gel to alkali solution;
alkali solution (1-alkali solid mass fraction) + additional water (gelling component amount + alkali solution alkali solid mass fraction) × water-solid ratio;
(the amount of the gelling component plus the alkali solution plus the additional water) and the mass ratio of the slurry to the bone are regenerated coarse aggregate plus fine aggregate;
fine aggregate (recycled coarse aggregate + fine aggregate) sand fraction;
the recycled coarse aggregate (recycled coarse aggregate + fine aggregate) -fine aggregate;
the using amount of the mineral powder is 90 percent of the using amount of the gelling component;
the usage of the fly ash is the usage of the gelling component-the usage of the mineral powder.
The invention also provides a system for designing the mixing proportion of the alkali-activated recycled concrete, which comprises the following components:
a target parameter unit for determining the target compressive strength f of the target alkali-activated recycled concrete according to the performance requirements of the application scenecu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthk；
A trial-fitting intensity calculating unit for calculating the trial-fitting intensity according to fcu,0≥fcu,k+1.645σkTo obtain fcu,0Specific numerical values, wherein fcu,0The strength of the alkali-activated recycled concrete is trial-prepared;
a water-solid ratio calculation unit for obtaining corresponding regression coefficient α according to the alkali-glue ratio A/Ba、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu,0Regression coefficient αa、αbCompressive strength f of sand 28dbCalculating to obtain a water-solid ratio W/GPS;
and the mixing ratio calculation unit is used for calculating the content of each component in the alkali-activated recycled concrete by using a slurry-bone mass ratio method according to the alkali-cement ratio A/B, the water-solid ratio W/GPS, the slurry-bone mass ratio and the sand rate.
Further, the standard deviation data base establishing unit is also included for establishing a standard deviation data base according to a formula
Calculating to obtain different compressive strengths f of the alkali-activated recycled concretecuCorresponding standard deviation sigma of strength, and the compressive strength fcuThe numerical values and the intensity standard deviations σ corresponding thereto are stored in a standard deviation database in one-to-one correspondence.
Further, the target parameter unit comprises a target parameter module for measuring the target compression strength fcu,kCompressive strength f in the sum standard deviation databasecuMatching the data to find the target compressive strength fcu，kNumerical value corresponding target intensity standard deviation sigmakNumerical values.
Furthermore, the water-solid ratio calculation unit comprises a water-solid ratio W/GPS calculation module used for calculating the water-solid ratio through a formula
And calculating to obtain the water-solid ratio W/GPS.
Further, the mix proportion calculating unit comprises a mix proportion calculating module for calculating by using the following relation equation:
the gelling component is used in the mass fraction of alkali gel to alkali solution;
alkali solution (1-alkali solid mass fraction) + additional water (gelling component amount + alkali solution alkali solid mass fraction) × water-solid ratio;
(the amount of the gelling component plus the alkali solution plus the additional water) and the mass ratio of the slurry to the bone are regenerated coarse aggregate plus fine aggregate;
fine aggregate (recycled coarse aggregate + fine aggregate) sand fraction;
the recycled coarse aggregate (recycled coarse aggregate + fine aggregate) -fine aggregate;
the using amount of the mineral powder is 90 percent of the using amount of the gelling component;
the usage of the fly ash is the usage of the gelling component-the usage of the mineral powder.
The invention has the beneficial effects that: the alkali-activated concrete using recycled aggregates such as construction wastes and the like to replace natural aggregates not only expands the application range of the alkali-activated concrete, but also fully recycles waste resources, and is beneficial to environmental protection; a calculation model suitable for alkali-activated recycled concrete is obtained by utilizing the water-solid ratio, corresponding regression coefficients and 28d mortar compressive strength under different alkali-cement ratios are established, the content of each component meeting the strength of the alkali-activated recycled concrete is finally calculated by adopting a mortar-bone mass ratio method, a mixing ratio design method of the alkali-activated recycled concrete is finally obtained, calculation is carried out according to the actual mass relationship among the components of the concrete, the obtained mixing ratio is more accurate, and the application range of the alkali-activated recycled concrete is wider.
Drawings
FIG. 1 is a flow chart of a method of an embodiment of the present invention for designing a mix ratio of alkali-activated recycled concrete;
FIG. 2 is a flow chart of a method of another embodiment of the alkali-activated recycled concrete mix design method of the present invention;
FIG. 3 is a block diagram of an embodiment of an alkali-activated recycled concrete mix design system of the present invention.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
It will be understood by those skilled in the art that, unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the prior art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
Referring to fig. 1, an embodiment of the present invention is provided, a method for designing a mix proportion of alkali-activated recycled concrete, comprising the following steps:
s2, determining target alkali excitation according to the performance requirement of the application sceneTarget compressive strength f of recycled concretecu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthk。
S3, according to fcu,0≥fcu,k+1.645σkTo obtain fcu,0Specific numerical values, wherein fcu,0The strength of the alkali-activated recycled concrete is prepared.
S4, obtaining a corresponding regression coefficient α according to the alkali-glue ratio A/Ba、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu,0Regression coefficient αa、αbCompressive strength f of sand 28dbAnd calculating to obtain the water-solid ratio W/GPS.
And S5, calculating the content of each component in the alkali-activated recycled concrete by using a mortar-bone mass ratio method according to the alkali-cement ratio A/B, the water-solid ratio W/GPS, the mortar-bone mass ratio and the sand ratio.
Referring to fig. 2, in another embodiment of the present invention, before step S2, step S1 is further included, specifically:
s1, according to the formula
Calculating to obtain different compressive strengths f of the alkali-activated recycled concretecuCorresponding standard deviation sigma of strength, and the compressive strength fcuThe numerical values and the intensity standard deviations σ corresponding thereto are stored in a standard deviation database in one-to-one correspondence.
In step S1, the different compressive strengths f are calculated according to the standard deviation σ of strength calculation formulacuCorresponding standard deviation of strength sigma, and according to the standard deviation of strength sigma and compressive strength f in Table 1cuThe standard deviation database 5 is table 1 in the present embodiment, and table 1 is shown below.
TABLE 1 alkali-activated recycled concrete compressive Strength Standard deviation σ
As described aboveStep S2, determining the target compressive strength f of the concrete according to the actual application scenecu,kThen, determining the alkali-cement ratio A/B according to the strength index and the requirement of a common concrete mix proportion design method JGJ55-2011 'common concrete mix proportion design rule'; additionally setting the target compressive strength fcu,kAnd compressive strength f in Table 1cuComparing the data to find the compressive strength f of the targetcu,kCompressive strengths f of the same or similar valuescuAnd selecting the intensity standard deviation sigma value of the suitable range as the intensity standard deviation sigmakTo proceed the next calculation. Specifically, according to the results of Table 1, when the standard value of the strength of the alkali-activated recycled concrete is within the range of 45MPa to 65MPa, the standard deviation of the strength is 4.0MPa. When in this range, the standard deviation of the intensity is taken as 4.0 directly. When the standard value of the strength of the alkali-activated recycled concrete is not in the range, the standard deviation of the strength can be obtained by adaptation.
Step S4 as described above, specifically by formula
And calculating to obtain the water-solid ratio W/GPS. The regression coefficient can be obtained by looking up table 2 according to the alkali-binder ratio A/B, and the table 2 is as follows:
TABLE 2 values of regression coefficients for different alkali-to-gum ratios
As mentioned above, in step S5, the step of calculating the content of each component in the alkali-activated recycled concrete by using the slurry-to-bone mass ratio method according to the alkali-to-cement ratio a/B, the water-to-solid ratio W/GPS, the slurry-to-bone mass ratio and the sand ratio includes:
the following relationship equation was used for the calculation:
the gelling component is used in the mass fraction of alkali gel to alkali solution;
alkali solution (1-alkali solid mass fraction) + additional water (gelling component amount + alkali solution alkali solid mass fraction) × water-solid ratio;
(the amount of the gelling component plus the alkali solution plus the additional water) and the mass ratio of the slurry to the bone are regenerated coarse aggregate plus fine aggregate;
fine aggregate (recycled coarse aggregate + fine aggregate) sand fraction;
the recycled coarse aggregate (recycled coarse aggregate + fine aggregate) -fine aggregate;
the using amount of the mineral powder is 90 percent of the using amount of the gelling component;
the usage of the fly ash is the usage of the gelling component-the usage of the mineral powder.
TABLE 3 compression strength of alkali-activated cement 28d mortar in test range
Wherein the alkali solution, the alkali-binder ratio, the alkali solid mass fraction, the water-solid ratio, the slurry-bone mass ratio and the sand rate are known parameters, and the other gelling component dosage, the additional water, the recycled coarse aggregate, the fine aggregate, the mineral powder dosage and the fly ash dosage are unknown parameters. The content of concrete components such as the amount of additional water, recycled coarse aggregate, fine aggregate, mineral powder, fly ash and the like required by people can be calculated by substituting all known parameters, and the mixing proportion of the alkali-activated concrete is further obtained. (the above 28d means 28 days)
Finally, preparing alkali-activated recycled concrete according to the obtained mixing proportion, maintaining for 28 days under standard conditions, testing to obtain the average value of the compressive strength of the concrete, comparing the average value with the target compressive strength to see whether the target compressive strength requirement is met, and selecting the mixing proportion if the target compressive strength requirement is met; if the concrete mixing ratio is not met, the concrete numerical values of the grout-to-bone ratio and/or the sand ratio are adjusted and then calculated until the proper mixing ratio of the alkali-activated recycled concrete is obtained.
The method is based on the component relationship under the condition that the cementing material is mainly mineral powder and is internally doped with 10% of fly ash, so that the mixing proportion of the alkali-activated recycled concrete obtained by the method is kept at 10% of the fly ash in the cementing raw material, and finally the mixing proportion of the alkali-activated recycled concrete meeting the strength requirement is obtained.
Specific examples are as follows:
the mix proportion design method provided by the inventionDesigning alkali-activated recycled concrete, and requiring: target compressive strength of fcu,k50MPa, good workability. The specific design steps are as follows:
(1) the alkali-to-gum ratio is first preliminarily determined. And (3) preliminarily selecting the alkali-cement ratio A/B to be 0.24 according to the strength index and the requirement of a common concrete mix proportion design method JGJ55-2011 'common concrete mix proportion design rule'.
(2) According to the alkali-cement ratio A/B, a corresponding regression coefficient can be obtained, namely, a relation between the compressive strength and the water-solid ratio can be clarified, the alkali-cement ratio A/B is 0.24, the table look-up 2 shows that the corresponding regression coefficient is αa＝0.2227,αb-1.5245. In addition, the compressive strength f of the mortar 28d at an alkali-cement ratio of 0.24 can be obtained from Table 3b＝58.2MPa。
(3) Target compressive strength f according to formulation targetcu,kWhen the target strength is between 45MPa and 65MPa, the standard deviation value of the target strength can be sigma according to the results in Table 1k4.0MPa, and the test strength f of the concrete is obtained therefromcu,0＝fcu,k+1.645σ＝50+1.645*4.0＝56.58MPa。
And will fcu,0，fb，αa、αbSpecific numerical value substitution formula
And solving to obtain the water-solid ratio W/GPS which is 0.352.
(4) Table look-up 3. the gel component dosage is 600+ 66-666 kg/m3The sand ratio is 0.45 and the mass ratio of the mortar to the bone is 0.99 through early-stage preliminary experiments according to the requirements of the working performance and the strength of the alkali-activated recycled concrete, the content of each component is calculated in the following specific calculation process,
in the first step, the water glass content is calculated, the gelling component is used in an alkali-to-gel ratio alkali-to-alkali solid mass fraction, and the test selects water glass with a modulus of 1.95, wherein Na is2The mass fraction of O is 14.26 percent, and the S iO2The mass fraction is 26.92%, so the alkali solid mass fraction of the water glass is 41.18%, and the mass fraction is substituted to obtain:
666 0.24 alkali solution 0.412,
the alkali solution (water glass) is obtained by calculation, wherein 387.96kg/m is obtained3。
Secondly, calculating the extra water content, namely alkali solution (1-alkali solid mass fraction) + extra water (gelling component dosage + alkali solution alkali solid mass fraction) × water-solid ratio, and substituting the calculated extra water content into the specific number of the known components to obtain the value:
387.96 (1-0.412) + additional water (666+387.96 0.412) × 0.352,
the additional water was calculated to be 62.57 kg/m.
Thirdly, calculating the total of the fine aggregate and the recycled coarse aggregate, (the using amount of the gelling component plus the alkali solution plus the extra water) and the mass ratio of the slurry to the recycled coarse aggregate plus the fine aggregate, and substituting the concrete numerical values of the related components:
(666+387.96+62.57) × 0.99 ═ recycled coarse aggregate + fine aggregate, from which it was calculated that the total of recycled aggregate + fine aggregate was 1127.81kg/m3。
Fourthly, calculating the fine aggregate, wherein the sand rate of the fine aggregate is (recycled coarse aggregate and fine aggregate); fine aggregate (1127.81 × 0.45) ═ 507.51kg/m3Wherein the fine aggregate is natural sand.
Fifthly, calculating the recycled coarse aggregate, substituting the recycled coarse aggregate (recycled coarse aggregate + fine aggregate) -fine aggregate into the specific numerical values of the related components, and calculating to obtain the recycled coarse aggregate (1127.81-507.51) ═ 620.30kg/m3。
Sixthly, calculating the using amount of the mineral powder, wherein the using amount of the mineral powder is 90% of the using amount of the gelling component, substituting the using amount into the specific numerical value of the related component, and calculating to obtain the using amount of the mineral powder which is 666 0.9-599.4 kg/m3。
The seventh step: calculating the coal ash dosage, namely the coal ash dosage which is 666-599.4 which is 66.6kg/m, substituting the coal ash dosage into the concrete data of the related components to obtain the coal ash dosage3。
Finally, a suitable specific mix ratio of alkali-activated recycled concrete was obtained, as shown in table 4:
TABLE 450MPa alkali-activated recycled concrete mix proportion
(5) And (4) preparing the alkali-activated recycled concrete according to the mixing ratio obtained in the step (4), wherein the slump of the fresh concrete is 172mm, the segregation or bleeding phenomenon does not occur, and the construction workability is good. And curing for 28 days under standard conditions, and testing to obtain the product with the average compressive strength of 53.1MPa, which meets the requirements.
(6) Because the characteristics of the used aggregate such as water absorption, grading, crushing index and the like have direct influence on the performance of the concrete, the properties of raw materials must be detected before the design of the mixing proportion.
The invention has the beneficial effects that: the alkali-activated concrete using recycled aggregates such as construction wastes and the like to replace natural aggregates not only expands the application range of the alkali-activated concrete, but also fully recycles waste resources, and is beneficial to environmental protection; a calculation model suitable for alkali-activated recycled concrete is obtained by utilizing the water-solid ratio, corresponding regression coefficients and 28d mortar compressive strength under different alkali-cement ratios are established, the content of each component meeting the strength of the alkali-activated recycled concrete is finally calculated by adopting a mortar-bone mass ratio method, a mixing ratio design method of the alkali-activated recycled concrete is finally obtained, calculation is carried out according to the actual mass relationship among the components of the concrete, the obtained mixing ratio is more accurate, and the application range of the alkali-activated recycled concrete is wider.
The invention also provides a system for designing the mixing proportion of the alkali-activated recycled concrete, which comprises the following components:
a standard deviation database establishing unit 1 for establishing a standard deviation database according to a formula
Calculating to obtain different compressive strengths f of the alkali-activated recycled concretecuCorresponding standard deviation sigma of strength, and the compressive strength fcuThe numerical values and the intensity standard deviations σ corresponding thereto are stored in a standard deviation database in one-to-one correspondence.
A target parameter unit 2 for determining the target compressive strength f of the target alkali-activated recycled concrete according to the performance requirements of the application scenecu,kAnd selecting a suitable baseGlue ratio A/B and standard deviation of strength sigmak；
A fitting intensity calculating unit 3 for calculating a fitting intensity according to fcu,0≥fcu，k+1.645σkTo obtain fcu，0Specific numerical values, wherein fcu,0The strength of the alkali-activated recycled concrete is trial-prepared;
a water-solid ratio calculation unit 4 for obtaining a corresponding regression coefficient α according to the alkali-glue ratio A/Ba、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu，0Regression coefficient αa、αbCompressive strength f of sand 28dbCalculating to obtain a water-solid ratio W/GPS;
and the mixing ratio calculating unit 5 is used for calculating the content of each component in the alkali-activated recycled concrete by using a slurry-bone mass ratio method according to the alkali-cement ratio A/B, the water-solid ratio W/GPS, the slurry-bone mass ratio and the sand rate.
A standard deviation database establishing unit 1 for calculating different compressive strengths f by the strength standard deviation sigma calculation formulacuCorresponding standard deviation sigma of strength, and according to the standard deviation sigma of strength and compressive strength f in the table IcuThe standard deviation database is recorded in a one-to-one correspondence form as a data table, which is table 1 in this embodiment.
The target parameter unit 2 comprises a target parameter module 201 for determining the target compressive strength f of the concrete according to the actual application scenariocu，kThen, determining the alkali-cement ratio A/B according to the strength index and the requirement of a common concrete mix proportion design method JGJ55-2011 'common concrete mix proportion design rule'; additionally setting the target compressive strength fcu，kAnd compressive strength f in Table 1cuComparing the data to find the compressive strength f of the targetcu，kCompressive strength f of the same valuecuAnd selecting the compressive strength fcuThe corresponding intensity standard deviation sigma value is taken as the intensity standard deviation sigmakTo proceed the next calculation.
The water-solid ratio calculating unit 4 comprises a water-solid ratio calculating module 401 for calculating the water-solid ratio by a formula
And calculating to obtain the water-solid ratio W/GPS. The water-solid ratio is the ratio of water to solid material.
The mix proportion calculating unit 5 includes a mix proportion calculating module 501, which is used for calculating by using the following relation equation:
the gelling component is used in the mass fraction of alkali gel to alkali solution;
alkali solution (1-alkali solid mass fraction) + additional water (gelling component amount + alkali solution alkali solid mass fraction) × water-solid ratio;
(the amount of the gelling component plus the alkali solution plus the additional water) and the mass ratio of the slurry to the bone are regenerated coarse aggregate plus fine aggregate;
fine aggregate (recycled coarse aggregate + fine aggregate) sand fraction;
the recycled coarse aggregate (recycled coarse aggregate + fine aggregate) -fine aggregate;
the using amount of the mineral powder is 90 percent of the using amount of the gelling component;
the usage of the fly ash is the usage of the gelling component-the usage of the mineral powder.
The alkali-activated concrete using recycled aggregates such as construction wastes and the like to replace natural aggregates not only expands the application range of the alkali-activated concrete, but also fully recycles waste resources, and is beneficial to environmental protection; a calculation model suitable for alkali-activated recycled concrete is obtained by utilizing the water-solid ratio, corresponding regression coefficients and 28d mortar compressive strength under different alkali-cement ratios are established, the content of each component meeting the strength of the alkali-activated recycled concrete is finally calculated by adopting a mortar-bone mass ratio method, a mixing ratio design method of the alkali-activated recycled concrete is finally obtained, calculation is carried out according to the actual mass relationship among the components of the concrete, the obtained mixing ratio is more accurate, and the application range of the alkali-activated recycled concrete is wider.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (8)
1. A design method for the mixing proportion of alkali-activated recycled concrete is characterized by comprising the following steps:
determining the target compressive strength f of the target alkali-activated recycled concrete according to the performance requirements of the application scenecu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthk；
According to fcu,0≥fcu,k+1.645σkTo obtain fcu,0Specific numerical values, wherein fcu,0The strength of the alkali-activated recycled concrete is trial-prepared;
obtaining corresponding regression coefficient α according to the alkali-glue ratio A/Ba、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu,0Regression coefficient αa、αbCompressive strength f of sand 28dbCalculating to obtain a water-solid ratio W/GPS;
calculating the content of each component in the alkali-activated recycled concrete by using a slurry-to-bone mass ratio method according to the alkali-to-cement ratio A/B, the water-to-solid ratio W/GPS, the slurry-to-bone mass ratio and the sand rate;
the alkali-activated recycled concrete comprises components of alkali solution, additional water, recycled coarse aggregate, fine aggregate, mineral powder and fly ash; and calculated using the following relationship:
the gelling component is used in the mass fraction of alkali gel to alkali solution;
alkali solution (1-alkali solid mass fraction) + additional water (gelling component amount + alkali solution alkali solid mass fraction) × water-solid ratio;
(the amount of the gelling component plus the alkali solution plus the additional water) and the mass ratio of the slurry to the bone are regenerated coarse aggregate plus fine aggregate;
fine aggregate (recycled coarse aggregate + fine aggregate) sand fraction;
the recycled coarse aggregate (recycled coarse aggregate + fine aggregate) -fine aggregate;
the using amount of the mineral powder is 90 percent of the using amount of the gelling component;
the using amount of the fly ash is equal to the using amount of the gelling component-the using amount of the mineral powder;
and preparing alkali-activated recycled concrete according to the content of each component in the alkali-activated recycled concrete, testing the actual strength of the alkali-activated recycled concrete, adjusting the mass ratio and/or sand rate of the mortar when the actual strength does not meet the target compressive strength, and calculating the content of each component in the alkali-activated recycled concrete according to the adjusted mass ratio and/or sand rate of the mortar.
2. The method for designing the mix proportion of the alkali-activated recycled concrete according to claim 1, wherein the target compressive strength f of the alkali-activated recycled concrete is determined according to the performance requirements of an application scenecu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthkBefore the steps, the method comprises the following steps:
according to the formula
Calculating to obtain different compressive strengths f of the alkali-activated recycled concretecuCorresponding standard deviation sigma of strength, and the compressive strength fcuThe numerical values and the intensity standard deviations σ corresponding thereto are stored in a standard deviation database in one-to-one correspondence.
3. The method for designing the mix proportion of the alkali-activated recycled concrete according to claim 2, wherein the target compressive strength f of the alkali-activated recycled concrete is determined according to the performance requirements of an application scenecu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthkThe method comprises the following steps:
the compressive strength f of the targetcu,kCompressive strength f in the sum standard deviation databasecuMatching the data to find the target compressive strength fcu，kNumerical value corresponding target intensity standard deviation sigmakNumerical values.
4. The method as claimed in claim 1, wherein the regression coefficient α is obtained according to the alkali-binder ratio A/Ba、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu,0Regression coefficient αa、αbCompressive strength f of sand 28dbAnd calculating to obtain the water-solid ratio W/GPS, comprising the following steps:
by the formula
And calculating to obtain the water-solid ratio W/GPS.
5. An alkali-activated recycled concrete mix proportion design system, comprising:
a target parameter unit for determining the target compressive strength f of the target alkali-activated recycled concrete according to the performance requirements of the application scenecu,kAnd selecting proper alkali-binder ratio A/B and standard deviation sigma of strengthk；
A trial-fitting intensity calculating unit for calculating the trial-fitting intensity according to fcu,0≥fcu,k+1.645σkTo obtain fcu,0Specific numerical values, wherein fcu,0The strength of the alkali-activated recycled concrete is trial-prepared;
a water-solid ratio calculation unit for obtaining corresponding regression coefficient α according to the alkali-glue ratio A/Ba、αbCompressive strength f of sand 28dbTaking value according to the alkali-binder ratio A/B and the trial strength fcu,0Regression coefficient αa、αbCompressive strength f of sand 28dbCalculating to obtain a water-solid ratio W/GPS;
the mixing proportion calculation unit is used for calculating the content of each component in the alkali-activated recycled concrete by using a slurry-bone mass ratio method according to the alkali-cement ratio A/B, the water-solid ratio W/GPS, the slurry-bone mass ratio and the sand rate;
the alkali-activated recycled concrete comprises components of alkali solution, additional water, recycled coarse aggregate, fine aggregate, mineral powder and fly ash; the mix proportion calculating unit comprises a mix proportion calculating module which is used for calculating by using the following relation equation:
the gelling component is used in the mass fraction of alkali gel to alkali solution;
alkali solution (1-alkali solid mass fraction) + additional water (gelling component amount + alkali solution alkali solid mass fraction) × water-solid ratio;
(the amount of the gelling component plus the alkali solution plus the additional water) and the mass ratio of the slurry to the bone are regenerated coarse aggregate plus fine aggregate;
fine aggregate (recycled coarse aggregate + fine aggregate) sand fraction;
the recycled coarse aggregate (recycled coarse aggregate + fine aggregate) -fine aggregate;
the using amount of the mineral powder is 90 percent of the using amount of the gelling component;
the using amount of the fly ash is equal to the using amount of the gelling component-the using amount of the mineral powder;
the mixing proportion calculation unit is also used for preparing the alkali-activated recycled concrete according to the content of each component in the alkali-activated recycled concrete, testing the actual strength of the alkali-activated recycled concrete, adjusting the mortar-bone mass ratio and/or the sand rate when the actual strength does not meet the target compressive strength, and calculating the content of each component in the alkali-activated recycled concrete according to the adjusted mortar-bone mass ratio and/or the adjusted sand rate.
6. The alkali-activated recycled concrete mix proportion designing system as set forth in claim 5, further comprising a standard deviation database creating unit for creating a standard deviation database according to a formula
Calculating to obtain different compressive strengths f of the alkali-activated recycled concretecuCorresponding standard deviation sigma of strength, and the compressive strength fcuThe numerical values and the intensity standard deviations σ corresponding thereto are stored in a standard deviation database in one-to-one correspondence.
7. The system for designing mix proportion of alkali-activated recycled concrete according to claim 6, wherein said target parameter unit comprises a target parameter module for setting a target compression strength fcu,kCompressive strength f in the sum standard deviation databasecuMatching the data to find the target compressive strength fcu，kNumerical value corresponding target intensity standard deviation sigmakNumerical values.
8. The system for designing mix proportion of alkali-activated recycled concrete according to claim 5, wherein said water-to-solid ratio calculation unit comprises a water-to-solid ratio W/GPS calculation module for calculating the water-to-solid ratio by formula
And calculating to obtain the water-solid ratio W/GPS.
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| CN110395963B (en) * | 2019-08-16 | 2021-11-09 | 北京市高强混凝土有限责任公司 | Construction waste recycled concrete |
| CN111548107A (en) * | 2020-05-29 | 2020-08-18 | 重庆建工第四建设有限责任公司 | Alkali slag concrete construction method |
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