CN104987002B - A kind of method that cement-based self-leveling mortar level is matched somebody with somebody - Google Patents
A kind of method that cement-based self-leveling mortar level is matched somebody with somebody Download PDFInfo
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Abstract
The invention provides a kind of method that cement-based self-leveling mortar level is matched somebody with somebody, including：Sand is carried out into mesh analysis；The screen over-size of per number sieve is weighed, grader retained percentage, accumulated retained percentage and the percent of pass of different-grain diameter sand is calculated respectively；Sand is carried out into preliminary gradation design；With in such scheme, the preliminary gradation design scheme of sand calculates P values and draws grading curve as base；The maximum particle diameter of the ratio and Fuller curves of initial setting powder and aggregate, calculates B values and PsdValue, draws Fuller curves；The grading curve is compared with Fuller curves, if deviation is larger, repeat the above steps, when having the point of more than three to overlap to grading curve and Fuller curves, obtain cement-based self-leveling mortar level with ratio.Full formula sieve-analysis curve and Fuller curves are fitted on the basis of Fuller curves by the application, have obtained most close-graded scheme.
Description
Technical field
The present invention relates to cement-based self-leveling mortar technical field, more particularly to a kind of cement-based self-leveling mortar level is matched somebody with somebody
Method.
Background technology
Cement-based self-leveling mortar be by inorganic coagulation material, fine aggregate, filler, latex powder and multiple additives compound and
Into one pack system mortar.During construction, only need to add water by the ratio of mud of regulation and stir, artificial or pumping is poured in cement mortar
On the ground of screed-coat, equably spread out with trowel and barbed froth breaking cylinder, the deadweight and mobility Self-leveling by slurry, Gu
Form after change that integral seamless, flat smooth, water-tight corrosion-proof, good permeability, intensity is high, wear-resistant and the ground of economy and durability
Level ground.Bed course Self-leveling and surfacing self-leveling floor can be divided into from the bearing requirements difference of Self-leveling, surfacing self-leveling floor is to surface smoothness
And the performance requirement such as wearability is higher.
Since the eighties in 20th century, the developed country such as the U.S., France, Germany, Italy, Sweden, Finland, in succession research open
Send out and produce ground gravity flowing levelling mortar, and be widely used.Product type includes cement based, gypsum base, magnesite base, drip
5 kinds of earth materials such as blue or green base and synthetic resin base, but produce, apply wider still cement-based self-leveling mortar.China flows automatically
Flat material is started late, and is mainly used in grouting supporting material and floor material.At present, many house ornamentations also begin to consideration cement
Self-leveling replaces traditional floor leveling material, and time saving and energy saving and flatness is good, and intensity is high, common product pour 6h can more than
People operates.With the improvement of people's living standards, there is higher and higher requirement to residence comfort, increasing owner selects
Laying timber floor even PVC floor, the high planarization of cement-based self-leveling can be very good the flatness for solving the problems, such as basic unit, and
It is and speed of application is fast, time saving and energy saving, there is very big application prospect in Decoration Industry.
But used as one of most complicated mortar product, cement-based self-leveling has a series of skill on formula is designed
Art problem, the equilibrium problem of mainly three big contradictions：First, the high fluidity of wet mortar and stable not segregability；Second, it is fast solidifying
Early epistasis and construction stage fluidity retentivity；3rd, the fine powder material of high-load and the contractility of after-hardening mortar.How just
Really handle well mobility and stability, it is early by force with slow setting, shrink and expand between contradiction, it is necessary to select good security, receive
Contracting is worth the appropriate obvious expanding material of compensation cement contractive effect of relatively small cement and admixture, and outside the chemistry of costliness
Plus agent could be realized.
Before the formulation optimization majority of Self-leveling is all primarily focused on Binder Materials and chemical admixture, later
With the continuous maturation in gravity flow flat products market at home, people also begin to notice that the level of sand matches the property of gravity flowing levelling mortar
Also can have a great impact.If can be matched somebody with somebody by adjusting the level of powder aggregate, adding for other additives can be saved
Enter, reduces cost.But, manufacturing enterprise and many product development persons know that formula needs adjustment level to match somebody with somebody, and but do not know how
Adjustment, can only carry out simple permutation and combination by existing several sands, under conditions of doing one's best, by test
The reasonability that checking level is matched somebody with somebody, generally requires many time and efforts.And the best formula of adjustment test result out,
Perhaps also it is not reaching to optimal level to match somebody with somebody, can also be micro-adjusted.This is accomplished by the help of mathematical model to instruct formula to design.
Early 1990s, Fuller and Thompson propose the ideal stage of granular system (Binder Materials+aggregate)
With curve, abbreviation Fuller curves.Its mathematic(al) representation is：
In formula：PsdFor percentage ratio (%) of the solid particle by sieve aperture d；
D is screen size (mm)；
DmaxFor maximum aggregate size (mm).
When Binder Materials+aggregate system meets formula 1, most closely knit particle size distribution can be obtained just, within the system,
The space between coarse granule/stone is filled in space in the filling of fine grained Binder Materials between granule/sand, middle granule/sand again.
Fuller is had been proposed that when the content (B values) of Binder Materials in granular materialss (Binder Materials+aggregate) total amount is, it is known that then formula 1 is variable
Shape is the preferable grading curve for characterizing coarse aggregate, and mathematic(al) representation is as follows：
In formula, B is the content (%) of Binder Materials in granular materialss Binder Materials+aggregate total amount, is calculated by formula 3：
Wherein, c is the consumption of Binder Materials in concrete, and a is the consumption of aggregate (sand+stone) in concrete.
Fuller curves are one and can realize that full formula variable grain density piles up the powerful of design, mixed in building
Solidifying soil field, especially mentions in mortar application.But theory is intended only as in mortar industry, also nobody carried out fixed
Amount is accurate to be operated.
At present, people in the art with by generally according to JGJ52-2006《Regular concrete sand, stone quality and inspection party
Method standard》Middle sand particle size distribution area carries out sand particle size distribution, as shown in table 1：
Table 1JGJ52-2006 sand particle size distributions area sand particle size distribution tables of data
The appropriate to the occasion preferential selection II areas sand of configuration concrete.When using I areas sand, sand coarse aggregate ratio should be improved, and keeps enough water
Mud consumption, it is when using III areas sand, preferably appropriate to reduce sand coarse aggregate ratio；When using ultra fine sand, corresponding regulation should be met.
The level of concrete be more ripe with technology and extensively by people approve technology, but be only limited to more than 4.75mm with
On gather materials and be designed.JGJ55-2011《Design of common concrete proportioning code》The former material gauge of middle high-strength concrete
Fixed, coarse aggregate preferably adopts continuous grading, and its nominal maximum aggregate size is not preferably greater than 25.0mm, and flat-elongated particles content is not preferably greater than
5.0%.The modulus of fineness of fine aggregate is preferably 2.6～3.0, that is, middle sand.
Draft what is write by China Academy of Railways Sciences《The provisional technical conditions of cement emulsified asphalt mortar》Middle requirement, carefully
Aggregate (sand) modulus of fineness 1.4～1.8, should adopt fluvial sand, mountain sand or Machine-made Sand.Fine aggregate should be maximum particle diameter less than 2.5mm
Rock particles, grain composition should meet table 2 and specify：
The grain composition of 2 fine aggregate of table requires tables of data
Either concrete product or CA mortar products, reach level with requiring that properties of product could optimize；But the above two
Bound wider range of kind of regulation, actually meets stone and sand under conditions of scope and might not reach most closely knit heap
Product.Only gathering materials to sand for having specifies, should be actually to do the closelypacked design of full formula system.And existing standard
And in technical specification, coarse regulation being only compared to aggregate, wide scope lacks accurate theoretical model.In cement
Correlational study and report in base gravity flow not with regard to full formula gradation design.
Cement-based self-leveling is similar to concrete (typically all pumping chutable concrete) and CA mortars (upper flow regime mortar),
And to the product that mobility, bleeding have high requirements, therefore mix in level and should be controlled by.
Li Yang exists《The research of gravity flowing levelling mortar aggregate proportioning and design》In propose a kind of configuration design of aggregate quantification
Method, using Dinger-Funk equations, needs laser particle size analyzer to carry out the grain size analyses of sand, output to computer, profit
Calculating is designed with computer program, but the method is simply designed to sand, and full formula is not designed,
And needing laser particle size analyzer to aid in, design calculation process is more complicated.
The Shen Yan autumns exist《Impact of the grain composition of sand to gravity flowing levelling mortar performance》In take several different sand not
Same proportioning, carries out the test of the performances such as intensity, it is found that grain composition difference is had an impact to intensity fluidity, but what in the end
It is optimal also no systematic research that level is matched somebody with somebody.
Li Zhanguo et al. exists《The particle diameter distribution of sand is to the ground impact of cement-based self-leveling material fluidity and intensity》
The middle granular-grade according to sand has manufactured four kinds of different ratios, and has carried out the test of fluidity and intensity.But these four
Ratio is not being expressly recited of how drawing.Thus, the applicant provides the side that a kind of cement-based self-leveling mortar level is matched somebody with somebody
Method.
The content of the invention
Present invention solves the technical problem that being to provide a kind of method that cement-based self-leveling mortar level is matched somebody with somebody.
In view of this, this application provides a kind of method matched somebody with somebody of cement-based self-leveling mortar level, comprises the following steps：
A), sand is carried out into mesh analysis successively according to a series of particle diameters；
B), the screen over-size of per number sieve is weighed, the grader retained percentage of different-grain diameter sand is calculated respectively, is added up to tail over hundred
Divide rate and percent of pass；
C), by step A) in sand carry out preliminary gradation design according to different-grain diameter；
D), by step C) in sand preliminary gradation design scheme based on, calculate P values according to the following equation and draw
Grain grading curve：
P=m × s × 100；
Wherein, p is the transmitance of a certain particle diameter sand；
M is step C) in certain sand account for the percentage rate of sand total amount；
S be step B) in certain sand a certain particle diameter percent of pass；
E), the maximum particle diameter of the preliminary really ratio and Fuller curves of setting powder and aggregate, obtains B values according to formula 3,
P is calculated according to formula 2sdValue, draws Fuller curves；
F), the grading curve is compared with Fuller curves, if deviation is larger, repeat step C), D),
E) and F), when having the point of more than 3 to overlap to grading curve and Fuller curves, obtain cement-based self-leveling mortar level and match somebody with somebody
Ratio.
Preferably, the sand includes the fine sand of sand and 100～200 mesh in the coarse sand of 40～70 mesh, 50～100 purposes.
Preferably, the particle diameter of the mesh analysis sieve include 0.90mm, 0.60mm, 0.45mm, 0.315mm, 0.22mm,
0.154mm, 0.11mm and 0.074mm.
Preferably, the mesh analysis carry out handss sieve again first to carry out vibrating sieving machine screening.
Preferably, step C) it is specially：
By step A) in sand by component divide, be divided into：Coarse sand, middle sand and fine sand；
By the sand of above-mentioned three kinds of components, according to 0:0:1、0:1:1、1:0:1 and 1:1:1 proportionate relationship carries out level arranging
Meter.
This application provides sand is carried out mesh analysis, is made not by method that a kind of cement-based self-leveling mortar level is matched somebody with somebody first
With the sieve by different-grain diameter of particle diameter, then per number screen over-size for sieving is weighed, calculate point meter sieve of different-grain diameter sand respectively
Then sand is carried out preliminary gradation design by remaining percentage rate, accumulated retained percentage and percent of pass, is the level of final sand with carrying
For contrast basis, with preliminary gradation design scheme as base, according to formula P=m × s × 100, the knot that will be calculated after above-mentioned mesh analysis
Fruit carries out computing with the ratio of sand in preliminary gradation design scheme, obtains P values, as a certain according to preliminary gradation design scheme
The percent of pass of particle diameter sand, so as to draw preliminary gradation design curve, then the ratio of initial setting powder and aggregate and
The maximum particle diameter of Fuller curves, obtains B values according to formula 3, and is calculated P according to formula 2sdValue, draws Fuller curves；
Finally preliminary grading curve is compared with Fuller curves, if deviation is larger, grading distribution scheme and D values, B values is adjusted, extremely
Two curves are farthest fitted, and the level of sand now reaches closelypacked scheme with as sand.
The present invention is, on the basis of Fuller curves, using simple mapping, gravity flowing levelling mortar full formula to be sieved bent
Line is fitted with Fuller curves, reaches most close-graded method, and the ratio i.e. B in the application shared by powder
Value, which affects Fuller slope of a curves, and is to affect the key factor that finally fitting formula level is matched somebody with somebody, the application carrying out level
During with design, be also included within, with higher preciseness and accuracy.Test result indicate that, according to this Shen
The graded sand of conceptual design please is obtained for the fluidity of gravity flowing levelling mortar, fluidity conservation rate, wet density and dry density
Improve.
Description of the drawings
Fig. 1 is the grading curve and Fuller curve charts of different sands in the embodiment of the present invention 1；
The grading curve figure of Fuller curves and 4# formula when Fig. 2 is 0.45 for D in embodiment 1；
The grading curve figure of Fuller curves and 5# formula when Fig. 3 is 0.45 for D in embodiment 1；
The grading curve figure of Fuller curves and 5# formula when Fig. 4 is 50 for B in embodiment 1；
The cylindricality curve chart that Fig. 5 is affected on gravity flowing levelling mortar amount of water and fluidity for different gradation sand in embodiment 1；
Fig. 6 is different gradation sand in embodiment 1 to gravity flowing levelling mortar Effects of Density bar diagram；
Fig. 7 is impact bar diagram of the different gradation sand to 1 day intensity of gravity flowing levelling mortar in embodiment 1；
The curve chart of Fuller curves and 6# formula when Fig. 8 is 0.8 for D in embodiment 2；
The curve chart of Fuller curves and 7# formula when Fig. 9 is 0.48 for D in embodiment 2；
The cylindricality curve chart that Figure 10 is affected on gravity flowing levelling mortar amount of water and fluidity for different gradation sand in embodiment 2；
Figure 11 is different gradation sand in embodiment 2 to gravity flowing levelling mortar Effects of Density bar diagram；
Figure 12 is impact bar diagram of the different gradation sand to 1 day intensity of gravity flowing levelling mortar in embodiment 2.
Specific embodiment
For a further understanding of the present invention, the preferred embodiment of the invention is described with reference to embodiment, but
It should be appreciated that these descriptions are simply to further illustrate the features and advantages of the present invention, rather than to the claims in the present invention
Limit.
The embodiment of the invention discloses a kind of method that cement-based self-leveling mortar level is matched somebody with somebody, comprises the following steps：
A), sand is carried out into mesh analysis successively according to a series of particle diameters；
B), the screen over-size of per number sieve is weighed, the grader retained percentage of different-grain diameter sand is calculated respectively, is added up to tail over hundred
Divide rate and percent of pass；
C), by step A) in sand carry out preliminary gradation design according to different-grain diameter；
D), by step C) in sand preliminary gradation design scheme based on, calculate P values according to the following equation and draw
Grain grading curve：
P=m × s × 100；
Wherein, p is the transmitance of a certain particle diameter；
M is step C) in certain sand account for the percentage rate of sand total amount；
S be step B) in certain sand a certain particle diameter percent of pass；
E), the maximum particle diameter of the preliminary really ratio and Fuller curves of setting powder and aggregate, obtains B values according to formula 3,
P is calculated according to formula 2sdValue, draws preferable Fuller curves；
F), the grading curve is compared with Fuller curves, if deviation is larger, repeat step C), D),
E) and F), when having the point of more than three to overlap to grading curve and Fuller curves, obtain cement-based self-leveling mortar level
With ratio.
The level that the present invention is provided in a kind of full formula for gravity flowing levelling mortar on the basis of closest packing principle model is matched somebody with somebody
Method of adjustment, which only needs to sieve aggregate, and by calculating, using mapping, adjusting curve can complete, and scheme is simply easy
OK.
During the cement-based self-leveling mortar level that the application is provided is matched somebody with somebody, the different-grain diameter of sand is first according to, will
Sand carries out mesh analysis.According to the characteristic of gravity flowing levelling mortar, which is thin layer construction material, therefore, the grain of herein described sand
Footpath is preferably 0.08mm～1mm, and herein described sand preferably includes the middle sand and 100 of the coarse sand of 40～70 mesh, 50～100mu
The fine sand of～200mu.Therefore here is interval chooses 5～8 different sieves of particle diameter and carries out mesh analysis, such as 0.90mm, 0.60mm,
0.45mm, 0.315mm, 0.22mm, 0.15mm, 0.11mm and 0.074mm.Specifically mesh analysis process is：Sieve is by aperture from little
It is stacked to order big, from top to bottom, and encloses sieve bottom, pours a sand sample into the superiors sieve, add screen cover, order mistake
Sieve.In order that sand is screened clean, the application carries out handss sieve preferably after vibrating sieving machine sieves again, until throughput per minute is less than
The 0.1% of sample total amount.
The screen over-size of per number sieve after sand is sieved, is then weighed, and calculated grader retained percentage respectively, tired out
Meter tails over percentage rate and percent of pass.Wherein grader retained percentage refers to matter of the screen over-size on each aperture divided by sample total amount
Amount percentage rate, accumulated retained percentage refer to that the grader retained percentage in each aperture sieve is at different levels more than the sieve aperture with aperture
The grader retained percentage sum of sieve, percent of pass refer to 1 accumulated retained percentage for deducting the aperture.The application is preferably by sand
Son carries out mesh analysis according to coarse sand, middle sand and fine sand, and obtains the above-mentioned size data of three kinds of difference sand, arranged to
In Excel tables, it is beneficial to later stage calculating and uses.
According to the present invention, sand is carried out into preliminary gradation design then, according to those skilled in the art frequently with method,
Sand can be divided into coarse sand, middle sand and fine sand, which can preferably according to 0:0:1、0:1:1、1:0:1 and 1:1:1 ratio
Relation carries out preliminary gradation design.
The application and then based on above-mentioned preliminary gradation design, calculates P values according to the following equation and draws grain composition
Curve：
P=m × s × 100；
Wherein, p is the transmitance of a certain particle diameter；
M is step C) in certain sand account for the percentage rate of sand total amount；
S be step B) in certain sand a certain particle diameter percent of pass；
For the ease of drawing, the percent of pass P of above-mentioned calculating can be arranged into Excel.
The grading curve of the above-mentioned drafting of the application is drawn in the case where initial setting sand level is matched somebody with somebody, from
If so gradation design is different, the grading curve of drafting is also different.Above-mentioned P, m and s during calculating, for sand
Particle diameter should all be that correspondence is chosen.
According to the present invention, fluidity then according to gravity flowing levelling mortar, intensity and surface property determine powder with aggregate
Ratio, and B values are calculated according to formula.Maximum particle diameter D of Fuller curves is assumed simultaneouslymax, and calculated according to formula 2, obtain
P under sand different-grain diametersdValue, result of calculation is arranged into Excel forms, and draws Fuller curves.
The grading curve is finally compared by the application with Fuller curves, if curve deviation is larger, is weighed
The level of new design sand matches somebody with somebody ratio, and due to being to be mutually related between data, then curve also can change therewith, last until adjustment
When overlapping to the higher point for having more than three of degree of fitting of curve, realization is when overlapping to greatest extent, the sand in the formula for obtaining
Sub- ratio is exactly to realize the optimized proportion of closest packing.
This application provides a kind of utilization mathematical model optimizing gravity flowing levelling mortar degree of compaction is the formula of comprehensive macro property
Gradation design method, and Jing gravity flowing levelling mortar experimental verifications, in experimental result, the performance such as mortar strength can meet mathematical modulo
The design original intention of type.
For a further understanding of the present invention, the cement-based self-leveling mortar level that the present invention is provided is matched somebody with somebody with reference to embodiment
Method be described in detail, protection scope of the present invention is not limited by the following examples.
Embodiment 1
The first step：Several sands that production needs are carried out into mesh analysis, the particle diameter general control of sand 0.08～1mm it
Between, therefore choose the different sieve of 8 particle diameters in this interval, 0.90mm, 0.60mm, 0.45mm, 0.315mm, 0.22mm,
0.154mm, 0.11mm and 0.074mm.Sieve by aperture from small to large, put, and encloses sieve bottom by order base from top to bottom.By one
Part sand sample (100-200g) pours the superiors' sieve into, adds screen cover, sequentially sieves.
Second step：Sieved using vibrating sieving machine and remove after 10min, then sieved with handss one by one, also directly can be sieved with handss, until per dividing
When clock throughput is less than the 0.1% of sample total amount.
3rd step：The screen over-size of per number sieve is weighed, the summation of surpluses in point meter screen over-size of all sieves and sieve bottom, with
Sample total amount before screening is compared, and difference must not exceed 1%.
4th step：Grader retained percentage, accumulated retained percentage and percent of pass are calculated, as shown in table 3.
The mesh analysis tables of data of the different sand of 3 three kinds of table
5th step：Required according to fluidity, intensity and surface property, determine the ratio of a powder and aggregate, such as 59:
41, drawn according to formula 3, B values are 59.Sand is divided into into coarse sand, middle sand and fine sand, three kinds of sands are pressed into combination of two or three kinds
The mode of combination carries out gradation design, such as table 4.
The four group of formula design table of 4 three kinds of sands of table
6th step：The grading curve (percent of pass) of component design is made, computing formula is：P=m × s × 100；Compile
Collect formula to insert in Excel tables, as shown in table 5 result of calculation one by one：
In 5 formula of table, sand level matches somebody with somebody tables of data
7th step：According to the formula of design, B values are 59, it is assumed that Fuller curve maximum particle diameters Dmax=0.8mm, according to public affairs
Formula 2 is edited formula and is calculated, and result of calculation is inserted in table 6, and the curve of four formula is drawn with Excel drawing functions
With preferable Fuller curves 1, such as Fig. 1.
The calculating of 6 full formula percent of pass of table and the Fuller curve data tables of different maximum particle diameters
8th step：The grading curve of formula is compared with Fuller curves, as shown in figure 1, in Fig. 1 ◆ curve is represented
1# sand grading curves, ■ curves represent 2# sand grading curves, and × curve represents 3# sand grading curves, and ▲ curve represents 4#
Sand grading curve ， ﹡ curves represent Fuller curves, as shown in Figure 1, the curve of four formula with Fuller curves deviation compared with
Greatly.Then change the ratio of different sands in table 4, due to when simple formula being write with Excel calculating data, being all cross-correlation
Join, therefore the numeral in table 5 can also change, the curve in Fig. 1 will change therewith.By the change of curve, and be allowed to
A certain bar Fuller curve comparison in difference, can instruct the adjustment of sand ratio again.Curve and the Fuller for calculating is found such as
Curve has compared content of the sand of some particle size range in formula more or low, it is possible to conscious by this particle diameter
In the range of sand amount accordingly reduce or increase, have higher until being adjusted to the curve for obtaining and certain standard Fuller curve
The maximum particle diameter D value of Fuller curves in table 6 during degree of fitting, is at this time adjusted again, is translated Fuller curves, is made two curves most
The coincidence of limits.At this moment the sand ratio in formula is exactly to realize the optimized proportion of closest packing.
As shown in table 7 and Fig. 2, Fig. 3, Fig. 2 is the Fuller curve charts of 4# grading curves and D=0.8, in Fig. 2 ◆ curve
4# sand grading curves are represented, ■ curves represent Fuller curves during D=0.8；After Fig. 3 is 5# formula adjustment sand ratios
The Fuller curve charts of grading curve and D=0.45, in Fig. 3 ◆ curve represents 5# sand grading curves, ■ curves represent D=
Fuller curves when 0.45；As seen from the figure, constantly change the ratio in 4# formula and change D=0.45, fit again
5# curves and Fuller curves 2 relatively.
7 4# formula adjustment sand ratio data tables of table
| Sand species | The ratio of sand in 4# after with Fuller curve matchings |
| Coarse sand | 9 |
| Middle sand | 81 |
| Fine sand | 10 |
| It is total | 100 |
Ratio data table of each component of 5# formula in formula after the fitting of table 8
| Formula is constituted | 5# |
| Powder (Binder Materials, flour filler, chemical addition agent) | 590 |
| Coarse sand | 36.9 |
| Middle sand | 332.1 |
| Fine sand | 41 |
| It is total | 1000 |
Although using existing sand, it is impossible to fit perfect Fuller curves, can be as close as
Fuller curves, that is, the granule in formula and most dense state be close to.
It is further to note that in the method, the ratio shared by powder, that is, B values, and affect Fuller bent
The form of line.As a example by figure 4 below, Fuller curve charts of the Fig. 4 for the identical D values of different B values, in Fig. 4 ◆ curve represents 5# sand
Sub- grading curve, ■ curves represent D=0.45, and Fuller curves during B=59, ▲ curve represent D=0.45, during B=50
B values in Fig. 3 as seen from the figure, are changed to 50 by Fuller curves, and new Fuller curves are not simple translations, but slope
On have certain change.
If from fig. 4 it can be seen that changing the ratio of powder, B value changes, corresponding Fuller curves are counted according to formula 2
Also the change having after calculation on slope, then the sand level in formula is matched somebody with somebody also will be with continuation adjustment.Thus accomplish to matching somebody with somebody
Square all grades rather than the only gradation design to sand.
Simple experiment result verification
By the curve ratio of Fig. 1 compared with we choose and deviate the maximum single-stages of Fuller with 1#, fitting first three sand 1：1：1
4# and fitting after 5# formula, carried out the test comparison of fluidity, dry and wet density and 1 day intensity, as a result such as Fig. 5, Fig. 6, Fig. 7
Shown, Fig. 5 is the cylindricality curve chart that different gradation sand is affected on gravity flowing levelling mortar amount of water and fluidity, and in Fig. 5, A posts are represented not
With the initial flow degree of graded sand, B posts represent the fluidity after different gradation sand gravity flowing levelling mortar 20min, and ▲ curve is represented not
With the curve of graded sand amount of water；Fig. 6 is different gradation sand to gravity flowing levelling mortar Effects of Density bar diagram, and in Fig. 6, A posts are represented not
With the wet density of graded sand, B posts represent the different gradation sand gravity flowing levelling mortar dry density of 1 day；Fig. 7 is different gradation sand to gravity flow
The impact bar diagram of 1 day intensity of flat mortar, in Fig. 7, A posts represent the different gradation sand gravity flowing levelling mortar rupture strength of 1 day, B post generations
The table different gradation sand gravity flowing levelling mortar comprcssive strength of 1 day.
Can be drawn according to above-mentioned test result, firstly, since the optimization of grain composition, the amount of water of gravity flowing levelling mortar has
Reduced, and fluidity and fluidity conservation rate are increased.The wet density and dry density of gravity flowing levelling mortar has all been carried
It is high.And the reduction of amount of water, 1 day intensity of gravity flowing levelling mortar is also improved.That is, in the constant premise of original formula
Under, simply change the ratio of sand, have optimization function to formula really.And not through repeatedly actual test, and
It is to use formula fitting method, realizes that formula level, with the Fitting Calculation, saves substantial amounts of time and efforts in Excel.
Embodiment 2
The step of according to embodiment 1, carries out sand level and matches somebody with somebody, and difference is：B=50, then, as shown in table 9, table 10, table 9 is three
Plant sand and be fitted tables of data after front and fitting, table 10 compounds the formula correction data table before and after being fitted for three kinds of sand；
Ratio data table before and after 9 three kinds of sand fittings of table
Formula correction data table before and after the compounding fitting of 10 ternary sand of table
It is adjusted, final D=0.48, B=50, sand level is with shown in table 10；Fig. 8 be D be 0.8 when Fuller curves with
The curve chart of 6# formula, in Fig. 8 ◆ curve represents 1# sand grading curves, ▲ curve represents D=0.80, during B=50
Fuller curves；The curve chart of Fuller curves and 7# formula when Fig. 9 is 0.48 for D, in Fig. 9 ◆ curve represents 2# sand levels
With curve, ▲ curve represents D=0.48, Fuller curves during B=50.
The result of checking this time fitting, as shown in Figure 10, Figure 11 and Figure 12, Figure 10 be sand level with before and after fitting to gravity flow
The cylindricality curve chart that flat mortar amount of water and fluidity affect, in figure, A posts represent the initial flow degree of different gradation sand, B post generations
Fluidity after table different gradation sand Self-leveling 20min, ▲ curve represent curve of the sand level with amount of water before and after fitting；Figure 11
It is sand level with bar diagram to the gravity flowing levelling mortar dry and wet Effects of Density of a day before and after fitting；In Figure 11, A posts represent not at the same level
Wet density with sand, B posts represent the different gradation sand Self-leveling dry density of 1 day；Figure 12 be sand level with fitting before and after to gravity flow
The bar diagram of 1 day intensity effect of flat mortar, in Figure 12, A posts curve represents the different gradation sand Self-leveling rupture strength of 1 day, B posts
Curve represents the different gradation sand Self-leveling comprcssive strength of 1 day.
In embodiment, it is 50% that powder accounts for the ratio of formula, has been declined than proportion in embodiment 1, and we are only right
The situation of three kinds of sands has carried out fitting and experimental verification, as can be seen that through the formula of fitting, adding water from Figure 10-Figure 12
Amount reduces one percentage point, by dry and wet density increases, and the intensity of one day also increases under fluidity loss rate.Implement
Also demonstrate in example 2, after formula is fitted, optimization function is served to the performance of gravity flowing levelling mortar really.
The explanation of above example is only intended to help and understands the method for the present invention and its core concept.It should be pointed out that right
For those skilled in the art, under the premise without departing from the principles of the invention, the present invention can also be carried out
Some improvement and modification, these improve and modification is also fallen in the protection domain of the claims in the present invention.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
Various modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized without departing from the spirit or scope of the present invention in other embodiments.Therefore, the present invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope for causing.
Claims (5)
1. a kind of method that cement-based self-leveling mortar level is matched somebody with somebody, comprises the following steps：
A), sand is carried out into mesh analysis successively according to a series of particle diameters；
B), the screen over-size of per number sieve is weighed, grader retained percentage, the accumulated retained percentage of different-grain diameter sand is calculated respectively
And percent of pass；
C), by step A) in sand carry out preliminary gradation design according to different-grain diameter；
D), by step C) in sand preliminary gradation design scheme based on, calculate according to the following equation and P values draw granular-grade
With curve：
P=m × s × 100；
Wherein, p is the transmitance of a certain particle diameter sand；
M is step C) in certain sand account for the percentage rate of sand total amount；
S be step B) in certain sand a certain particle diameter percent of pass；
E), the maximum particle diameter of the ratio and Fuller curves of initial setting powder and aggregate, obtains B values according to formula 3, according to public affairs
Formula 2 is calculated PsdValue, draws Fuller curves；
Wherein：D is screen size (mm)；
DmaxFor maximum aggregate size (mm)；
B is the content (%) of Binder Materials in granular materialss total amount, and the granular materialss are gel rubber material and aggregate；
C is the consumption of Binder Materials in concrete, and a is the consumption of aggregate in concrete；
F), the grading curve is compared with Fuller curves, if deviation is larger, repeat step C), D), E) and
F), when having the point of more than 3 to overlap to grading curve and Fuller curves, obtain cement-based self-leveling mortar level proportioning
Example.
2. method according to claim 1, it is characterised in that the sand includes the coarse sand of 40～70 mesh, 50～100 mesh
Middle sand and 100～200 mesh fine sand.
3. method according to claim 1, it is characterised in that the particle diameter of the mesh analysis sieve include 0.90mm,
0.60mm, 0.45mm, 0.315mm, 0.22mm, 0.154mm, 0.11mm and 0.074mm.
4. method according to claim 1, it is characterised in that the mesh analysis carry out handss again first to carry out vibrating sieving machine screening
Sieve.
5. method according to claim 1, it is characterised in that step C) it is specially：
By step A) in sand by component divide, be divided into：Coarse sand, middle sand and fine sand；
By the sand of above-mentioned three kinds of components, according to 0:0:1、0:1:1、1:0:1 and 1:1:1 proportionate relationship carries out gradation design.
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| CN108256245B (en) * | 2018-01-24 | 2021-10-29 | 叶寿春 | Preparation method of high-performance concrete |
| CN109279796B (en) * | 2018-07-05 | 2021-05-14 | 广西大学 | Design and preparation method of continuous surrounding stacking dense-grade prepared machine-made sand |
| CN110423069B (en) * | 2019-08-21 | 2022-02-08 | 中山蓝翠鸟新型环保材料有限公司 | Ultrahigh-strength grouting material and preparation method thereof |
| CN112115608B (en) * | 2020-09-16 | 2024-03-15 | 中国地质大学（北京） | Composite particle size calculation and grading adjustment configuration method |
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