CN109574602A - A kind of recycled fine aggregate gravity flowing levelling mortar and its preparation - Google Patents
A kind of recycled fine aggregate gravity flowing levelling mortar and its preparation Download PDFInfo
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- 239000004570 mortar (masonry) Substances 0.000 title claims abstract description 69
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 230000005484 gravity Effects 0.000 title description 14
- 239000002245 particle Substances 0.000 claims abstract description 65
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 24
- 239000004568 cement Substances 0.000 claims abstract description 17
- 239000003638 chemical reducing agent Substances 0.000 claims abstract description 16
- 239000010881 fly ash Substances 0.000 claims abstract description 10
- 229910021487 silica fume Inorganic materials 0.000 claims abstract 6
- 230000002940 repellent Effects 0.000 claims abstract 5
- 239000005871 repellent Substances 0.000 claims abstract 5
- 238000000034 method Methods 0.000 claims description 61
- 239000000203 mixture Substances 0.000 claims description 21
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 13
- 238000004458 analytical method Methods 0.000 claims description 11
- 230000003247 decreasing effect Effects 0.000 claims description 10
- 238000012360 testing method Methods 0.000 claims description 10
- 230000000694 effects Effects 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 230000007423 decrease Effects 0.000 claims description 8
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 6
- 239000011344 liquid material Substances 0.000 claims description 6
- 239000011707 mineral Substances 0.000 claims description 6
- 239000000843 powder Substances 0.000 claims description 6
- 238000003756 stirring Methods 0.000 claims description 6
- CSCPPACGZOOCGX-UHFFFAOYSA-N Acetone Chemical compound CC(C)=O CSCPPACGZOOCGX-UHFFFAOYSA-N 0.000 claims description 4
- 239000002994 raw material Substances 0.000 claims description 4
- BDHFUVZGWQCTTF-UHFFFAOYSA-M sulfonate Chemical compound [O-]S(=O)=O BDHFUVZGWQCTTF-UHFFFAOYSA-M 0.000 claims description 4
- 238000004364 calculation method Methods 0.000 claims description 3
- 238000002156 mixing Methods 0.000 claims description 3
- 229920005646 polycarboxylate Polymers 0.000 claims description 3
- -1 sawdust Substances 0.000 claims description 3
- 229920005610 lignin Polymers 0.000 claims description 2
- 229920000877 Melamine resin Polymers 0.000 claims 1
- IVJISJACKSSFGE-UHFFFAOYSA-N formaldehyde;1,3,5-triazine-2,4,6-triamine Chemical compound O=C.NC1=NC(N)=NC(N)=N1 IVJISJACKSSFGE-UHFFFAOYSA-N 0.000 claims 1
- NVVZQXQBYZPMLJ-UHFFFAOYSA-N formaldehyde;naphthalene-1-sulfonic acid Chemical compound O=C.C1=CC=C2C(S(=O)(=O)O)=CC=CC2=C1 NVVZQXQBYZPMLJ-UHFFFAOYSA-N 0.000 claims 1
- WPONNXIJPKZHGB-UHFFFAOYSA-N formaldehyde;sulfamic acid Chemical compound O=C.NS(O)(=O)=O WPONNXIJPKZHGB-UHFFFAOYSA-N 0.000 claims 1
- 239000002002 slurry Substances 0.000 abstract description 6
- 238000009825 accumulation Methods 0.000 abstract 1
- 230000006835 compression Effects 0.000 description 20
- 238000007906 compression Methods 0.000 description 20
- 239000004567 concrete Substances 0.000 description 16
- 238000013461 design Methods 0.000 description 8
- 230000008929 regeneration Effects 0.000 description 8
- 238000011069 regeneration method Methods 0.000 description 8
- 238000005259 measurement Methods 0.000 description 7
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 239000002956 ash Substances 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000002699 waste material Substances 0.000 description 6
- 238000011160 research Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 3
- 239000007859 condensation product Substances 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000011049 filling Methods 0.000 description 3
- 239000008187 granular material Substances 0.000 description 3
- 239000011148 porous material Substances 0.000 description 3
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 2
- UFWIBTONFRDIAS-UHFFFAOYSA-N Naphthalene Chemical compound C1=CC=CC2=CC=CC=C21 UFWIBTONFRDIAS-UHFFFAOYSA-N 0.000 description 2
- 230000002742 anti-folding effect Effects 0.000 description 2
- 239000010426 asphalt Substances 0.000 description 2
- 239000004566 building material Substances 0.000 description 2
- 238000011161 development Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000003623 enhancer Substances 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- 239000002689 soil Substances 0.000 description 2
- 229910021529 ammonia Inorganic materials 0.000 description 1
- 229940125717 barbiturate Drugs 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 238000010835 comparative analysis Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 239000004035 construction material Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 239000010419 fine particle Substances 0.000 description 1
- BTCSSZJGUNDROE-UHFFFAOYSA-N gamma-aminobutyric acid Chemical compound NCCCC(O)=O BTCSSZJGUNDROE-UHFFFAOYSA-N 0.000 description 1
- 235000019580 granularity Nutrition 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000013178 mathematical model Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/02—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing hydraulic cements other than calcium sulfates
- C04B28/06—Aluminous cements
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00017—Aspects relating to the protection of the environment
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Ceramic Engineering (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Inorganic Chemistry (AREA)
- Materials Engineering (AREA)
- Structural Engineering (AREA)
- Organic Chemistry (AREA)
- Curing Cements, Concrete, And Artificial Stone (AREA)
Abstract
本发明提供一种再生细骨料自流平砂浆及其制备。所述再生细骨料自流平砂浆包括质量份的以下成分：水泥600～700份，粉煤灰20～40份，硅灰10～15份，再生细骨料200～240份，锯末40～110份，憎水剂3～6份，减水剂10～15份，水300～500份。本发明采用三种粒度的再生骨料，选择了合理的颗粒组合，使骨料堆积后的总表面积和空隙率均较小，则在浆体用量一定时，可以很好地与骨料结合，提高砂浆强度。The invention provides regenerated fine aggregate self-leveling mortar and its preparation. The regenerated fine aggregate self-leveling mortar includes the following components in parts by mass: 600-700 parts of cement, 20-40 parts of fly ash, 10-15 parts of silica fume, 200-240 parts of regenerated fine aggregate, and 40-110 parts of sawdust 3 to 6 parts of water repellent, 10 to 15 parts of water reducing agent, and 300 to 500 parts of water. The invention adopts recycled aggregates of three particle sizes, and selects a reasonable combination of particles, so that the total surface area and porosity of the aggregates after accumulation are small, and when the amount of slurry is constant, it can be well combined with the aggregates. Increase mortar strength.
Description
Technical field
The invention belongs to technical field of buildings, and in particular to a kind of mortar and preparation method thereof containing recycled fine aggregate.
Background technique
Building waste refers to the waste generated in creating, being transformed or tearing open old building or structures activity, usually wraps
It containing dregs, waste and old concrete, waste and old masonry etc., while also including the surplus occurred in site activity, damage and interim material.
With the development of urbanization, building waste is increasing, and the application of construction refuse regenerated aggregate becomes trend.
Recycled aggregate has certain difference compared with natural aggregate, and recycled aggregate first has higher porosity and water suction
Rate, secondly intensity is lower than natural aggregate.How reasonably so that its concrete is provided superior performance with recycled aggregate is
The emphasis of current research[1]。
Fathifazl[2]It is proposed identical body area method (EMV) theory point out according to comparison normal concrete mortar
The equal principle of total volume prepares regenerated aggregate concrete, wherein in regeneration concrete mortar total volume by fresh mortar volume and
Recycled aggregate adheres to mortar volume and constitutes.Therefore, the regeneration concrete prepared under the conditions of identical water-cement ratio using EMV method is strong
Degree and elasticity modulus are close to comparison natural aggregate concrete, and discreteness is small.But due to fresh mortar volume much smaller than pair
Than normal concrete mortar volume, the workability of fresh concrete is not easy to meet requirement.The neat Xiushan Mountain[3]By mechanical enhancer mistake
Recycled aggregate afterwards is compared with the recycled aggregate after simple crushing, one timing of discovery cementitious material, as recycled aggregate replaces
For the increase of rate, 28d intensity all decreases.But the aggregate after mechanical enhancer is higher than the intensity of simple crushing.
Pereira and Evangelista[4]Research finds mixed when recycled fine aggregate substitutes 20%~30% natural fine aggregate
Increasing occurs in solidifying soil compression strength.Lai Zhaoqiong[5]Fuller maximal density curve is applied in tubular pile concrete preparation, is recognized
It can be achieved with to control the great Shi ratio of coarse aggregate and average size simultaneously using maximal density curve to grading of aggregates
Regulation makes more satisfied concrete.Wang Lijiu[6]For the effect of aggregate in asphalt, respectively application filling,
It accumulates and three broad theory of point shape derives the mathematical model of coarse aggregate and fine aggregate gradation design, and contrived experiment is tested
Card, is as a result all satisfied requirement.
To sum up the study found that forefathers are more to the research of recycled aggregate substitution rate, recycled aggregate grade matches concrete performance
Influence research it is less, accumulate theoretical most of research using density and be only applicable in pitch mixing material.
Bibliography
[1] Wuhan Song Shaomin civil engineering material: publishing house, Wuhan University of Technology, 2013
[2] G Fathifazl, A Abbas, A G Razaqpur, et al.New mixture proportioning
method for concrete made with coarse recycledconcrete aggregate[J].Journal of
Materials in Civil Engineering, 2009,21 (10): 601-611.
[3] the intensifying regenerating aggregate and simple regeneration aggregate of Qi Xiushan, Li Qiuyi, Wang Junwei different addition quantity are mixed to regeneration
Experimental study [J] engineering construction that solidifying soil mechanics performance influences, 2015,47 (1)
[4] Pereira P, Evangelista L, De Brito J.The effect of superplas-
ticisers on the workability and compressive strength of con-crete made with
Fine recycled concrete aggregates [J] .Construction and Building Materials,
2012,28 (1): 722-729.
[5] Lai Zhaoqiong, Huang Hongjian, Chen Zhaoming wait application [J] Guangdong of the .FULLER curve in tubular pile concrete production
Building materials, 2013,29 (7): 15-18.
[6] Wang Lijiu, Liu Hui framework compact type asphalt mixture aggregate grading design method [J] Chinese Highway journal,
2008,21(5):6-9.
Summary of the invention
In order to solve the problems, such as building waste resource recycling, the first purpose of this invention is to propose that a kind of regeneration is thin
Aggregate gravity flowing levelling mortar.
Second object of the present invention is to propose a kind of preparation method of recycled fine aggregate gravity flowing levelling mortar.
Realize the technical solution of above-mentioned purpose of the present invention are as follows:
A kind of recycled fine aggregate gravity flowing levelling mortar, the following component including mass parts: 600~700 parts of cement, flyash 20
~40 parts, 10~15 parts of silicon ash, 200~240 parts of recycled fine aggregate, 40~110 parts of sawdust, 3~6 parts of hydrophober, water-reducing agent 10
~15 parts, 300~500 parts of water.
Wherein, the cement is quick hardening sulphoaluminate cement, and/or, the activity index of the silicon ash is 110~125.
Wherein, the apparent density of the sawdust is 0.2~0.7g/cm3, water-reducing agent is polycarboxylate water-reducer, sulfomethylated lignin
Barbiturates water-reducing agent, naphthalene sulfonic salt formaldehyde condensation products, melamino-formaldehyde condensation polymer, acetone sulfonate and formaldehyde condensation product, ammonia
One of base sulfonate and formaldehyde condensation product is a variety of.
Commercially available hydrophober can be used in the hydrophober.
Wherein, the recycled fine aggregate includes: the bulky grain of 4.75~1.18mm, the middle particle of 1.18~0.3mm,
0.3mm little particle below.
Preferably, the combination of the recycled fine aggregate mass percent are as follows: bulky grain 20~70%, middle particle 21~
37%, little particle 5~50%.
It is highly preferred that the combination of the recycled fine aggregate mass percent are as follows: bulky grain 44~55%, middle particle 21~
25%, little particle 20~31%.
A kind of preparation method of recycled fine aggregate gravity flowing levelling mortar, with cement, flyash, silicon ash, recycled fine aggregate, saw
End, hydrophober, water-reducing agent and water are raw material, prepare mortar specimen measurement flexural strength and compression strength, pass through Fuller method, K
Method or i method, the affecting laws of analysis recycled fine aggregate grade pairing intensity, obtain the gradation of suitable recycled fine aggregate.
Wherein, about the distribution of particles situation of best bulk density, some scholars advocated using the beginning of the nineties in last century
The ideal screen analysis curve that Fuller and Thompson is proposed, abbreviation Fuller curve.
K method can control the size of minimum grain size, can guarantee passing through when calculated grade is fitted over compared with small particle in this way
Rate is within the acceptable range.
I method is to use the meter being made up of percentage degradation factor i for the mineral aggregate gradation of parameter when grain diameter successively decreases
Calculation method.
Further, when being analyzed using one of Fuller method, K method or i method, by recycled fine aggregate every kind
Grain proportion increases and decreases 5~6 grades of setting step by step, and the sample of 5~6 different gradations is arranged, and it is strong to prepare the anti-folding of mortar specimen measurement
Degree and compression strength；The ratio increased and decreased step by step is 2~4%.
Wherein, the preparation method, comprising steps of
1) cement, sawdust, flyash, silicon ash, recycled fine aggregate are uniformly mixed and are made as powder；Again by water, water-reducing agent, hate
Aqua is uniformly mixed and is made as liquid material；
2) liquid material is first added into container and adds powder, recycled fine aggregate is added after stirring 10~30s, continues stirring 2
Mortar mixture is plugged and pounded molding by~10min, curing.
Further,
The Fuller method is to carry out gradation according to Fuller curve；
The k method carries out gradation using following formula:
In formula: percent of pass (%) of the px-mineral aggregate in xth grade sieve pore；
X-aggregate diameter series, x=3.32lg D1/Dx, Dx are xth grade sieve pore partial size；
K-quality degradation factor selects 0.75~0.80；
M=3.32lg D1/Dm, D1 are maximum particle diameter, and Dm is minimum grain size.
The i method calculation formula are as follows:
px=100 × ix-1(formula 2)
In formula: percent of pass (%) of the px-mineral aggregate in xth grade sieve pore；
X-aggregate diameter series, when maximum particle diameter is D1: when x=1, D1/2: x=2；
For i-by percentage degradation factor, choosing i value is 0.55~0.75, is spaced 0.05 between every group.
A preferred technical solution of the present invention are as follows:
The i method analysis includes operation: with cement, flyash, silicon ash, recycled fine aggregate, sawdust, hydrophober, diminishing
Agent and water are raw material, and by the bulky grain of recycled fine aggregate in 44~70% ranges, middle particle is small in the range of 25~21%
For particle in 9~31% ranges, every kind of particle proportion increases and decreases 5~6 grades of setting, the particle proportion increased and decreased step by step step by step
Difference be 2~3%；
Mortar specimen is prepared, the flexural strength and compression strength of 3d, 7d are tested in standard curing, thin by the analysis regeneration of i method
Affecting laws of the grading of aggregates to intensity.
Method proposed by the present invention has the advantage that
The present invention uses the recycled aggregate of three kinds of granularities, and reasonable particle has been selected to combine, the summary table after accumulating aggregate
Area and voidage are smaller, then in one timing of paste content, can improve mortar strength well in conjunction with aggregate.
The present invention utilizes the grain composition of the gradations Theoretical Design recycled fine aggregates such as fuller grading curve, i method and k method,
Influence of the different gradation recycled fine aggregate to production lightweight thermal insulation inner-wall plate gravity flowing levelling mortar intensity is studied, optimal regeneration is obtained
Fine aggregate combination, provides reference for actual production.
The present invention proposes that the gravity flowing levelling mortar intensity made with i method is high, table while compression strength is close with K method
Reveal excellent flexural strength, requirement of the production wallboard to flexural strength can be met.
Detailed description of the invention
Fig. 1 is fine aggregate ideal Fuller grading curve.
Fig. 2 is influence curve figure of the Fuler different gradation combination to mortar flexural strength.
Fig. 3 is influence curve figure of the Fuller different gradation combination to mortar compression strength.
Fig. 4 is influence curve figure of the K method grading composition to flexural strength.
Fig. 5 is influence curve figure of the K method grading composition to compression strength.
Fig. 6 is influence curve figure of the i method grading composition to flexural strength.
Fig. 7 is influence curve figure of the i method grading composition to compression strength.
Specific embodiment
Technical solution of the present invention is further illustrated with specific embodiment below.Those skilled in the art should know real
It applies example and is merely to illustrate the present invention, be not used in and limit the scope of the invention.
In embodiment, unless otherwise instructed, technological means used is this field conventional technology.
Embodiment 1:
Using 42.5 quick hardening sulphoaluminate cements, II grades of flyash, the silicon ash that activity index is 115, recycled fine aggregate, table
Sight density is 0.5g/cm3Pine wood sawdust, hydrophober (DOW CORNING hydrophober SHP-60), polycarboxylate water-reducer etc..
Powder is made by cement, sawdust, mineral admixture etc. are uniformly mixed first；It is again that water, water-reducing agent, hydrophober etc. is mixed
It closes and liquid material is uniformly made.Liquid material is first added into the container for be provided with blender and adds powder, regeneration is added carefully after stirring 15s
Aggregate, continues to stir 4min, mortar mixture is fitted into 40mm × 40mm × 160mm die trial and plugs and pounds forming, and standard curing is surveyed
Try the flexural strength and compression strength of 3d, 7d.
It in the present embodiment, is matched according to used plant produced, tests and determine that initial ratio is as shown in table 1, wherein regenerating
Fine aggregate uses graduation three, i.e., by 4.75-1.18mm bulky grain, particle in 1.18-0.3mm, 0.3mm little particle below according to
Mass ratio is composed.In initial ratio (code name FX1), recycled fine aggregate combination are as follows: big: in: small=1:1:2.
1 mortar mix ratio (g) of table
Embodiment 2
Fig. 1 is the ideal that the theory proposed according to Roland Huttit Bernd Hillemeier makes fine aggregate
Fuller curve graph.As shown in Figure 1, Fuller gradation are as follows: 4.75-1.18mm particle accounts for about 33%, 1.18-0.3mm particle about
37% is accounted for, 0.3mm or less particle accounts for about 30%.It was found that initial fine aggregate gradation are as follows: 4.75-1.18mm particle is 25%,
1.18-0.3mm particle is 25%, and 0.3mm or less particle is 50%, i.e. coarse granule is less, and fine grained is more.So matching in initial level
Between (code name FX1) and fuller gradation (code name FX5).Every kind of particle proportion of recycled fine aggregate is increased and decreased step by step and is set
5 grades are set, the sample of 5 groups of different gradations is prepared, prepares mortar specimen measurement flexural strength and compression strength；The ratio increased and decreased step by step
It is 2%.Referring to following table.
The grading composition (%) of 2 recycled fine aggregate of table
The preparation method of mortar and the method for test intensity are the same as embodiment 1.
Embodiment 3
Recycled fine aggregate grade, which is analyzed, by K method matches intensity.In the present embodiment, K value value 0.60~0.8, interval 0.05,
Five groups of gradings of aggregates are calculated by formula 1 to combine, such as table 3.Every kind of particle proportion of recycled fine aggregate is increased and decreased step by step and is set
5 grades are set, the sample of 5 groups of different gradations is prepared, prepares mortar specimen measurement flexural strength and compression strength；The ratio increased and decreased step by step
Difference is 4% or 2%.
3 K method grading of aggregates of table combines (%)
The preparation method of mortar and the method for test intensity are the same as embodiment 1.
Embodiment 4
Recycled fine aggregate grade, which is analyzed, by i method matches intensity.It, can as i=0.65~0.75 referring to early-stage study experience
More closely knit mixture is obtained, it is 0.55~0.75 that the present embodiment, which chooses i value, is spaced 0.05 between every group, particle diameter distribution such as table
4。
4 i method grading of aggregates (%) of table
The preparation method of mortar and the method for test intensity are the same as embodiment 1.
Experimental result and analysis
Fuller method mortar strength:
According to the match ratio of table 2, five kinds of recycled fine aggregates combination production mortar specimens shown in table 2, measurement mark support 3d and
The flexural strength and compression strength of 7d, is as a result shown in Fig. 2 and Fig. 3.Figure it is seen that as recycled fine aggregate is combined to satisfaction
Fuller curve combination is close, and mortar flexural strength is gradually increased.3d flexural strength reaches maximum value 3.5MPa, 7d in FX3 group
Flexural strength reaches maximum value 3.9MPa in FX4 group, keeps smooth variation substantially later.According to the analysis, FX3 and FX4 combination
In the combination of three kinds of fineness particles rationally, compactness is high after collocation, and mutually mechanical snap is more significant between particle, is conducive to improve anti-
Curved performance.0.3mm fine grained below is excessive in FX1, FX2 combination, has almost accounted for the half of aggregate total amount, and little particle increases
More, total surface area increases, and under the premise of gel material content is certain, the package paste thickness of aggregate surface is reduced, and causes to resist
Curved ability is poor.
From figure 3, it can be seen that compression strength FX1 combination FX4 group shows as higher value.FX4 group 3d compression strength is most
Height is 14.3MPa, and more good grading of aggregates can play skeleton function well at this time, provide certain compression strength.And it arrives
Highest 7d intensity is FX1 group, and basic aquation finishes cement at this time, while little particle aggregate content is more so that structure
Density is larger, and anti-pressure ability is risen.
The intensity of comprehensive analysis FX1-5 group, with gradually increasing for group number, short grained aggregate accounting is gradually decreased, and is resisted
Folding intensity and compression strength all have a certain upgrade, and under the range that intensity allows, higher flexural strength is that configuration is outer within the walls
The important indicator of plate, therefore, it is considered that FX4 group shows preferable performance.
The mobility of discovery mortar is bad during the above test, and thinking is that sawdust water imbibition is too big, therefore rear
Match ratio is adjusted in continuous test, sawdust dosage is reduced, while increasing hydrophober dosage, mortar mobility is made to reach Self-leveling, is adjusted
Mortar mix ratio such as embodiment 5 after whole.
K method mortar strength:
Mortar specimen is prepared according to the mortar mix ratio of table 6 and the recycled fine aggregate combination of table 3, measurement intensity results are shown in figure
4 and Fig. 5.From fig. 4, it can be seen that the flexural strength of gravity flowing levelling mortar gradually decreases with the reduction of K value.Anti- folding when K=0.8
Intensity highest, 3d flexural strength value improve 1.07 times that 8%, 7d flexural strength is minimum value than minimum.As known from Table 3,
As K value reduces, bulky grain content increases to 70% by 54% in recycled fine aggregate, and too many bulky grain makes aggregate voidage
Increase, compactness reduces, the decline of flexural strength.As shown in figure 5, between K value is from 0.80 to 0.60, after intensity first reduces and
It improves, lower compression strength is reached in k=0.70.Comparative diagram 4 also occurs the low ebb of flexural strength in 7d age.
Think that grain composition at this time is bad, pressure-proof and snap-resistent intensity is undesirable.
According to the analysis, the intensity that K value is shown more greatly is higher in reasonable section, this experiment thinks that K value is selected
0.80,0.75 is that ideal stage is matched.
I method mortar strength:
Mortar specimen is prepared according to the mortar mix ratio of table 6 and the recycled fine aggregate combination of table 4, measurement intensity results are shown in figure
6 and Fig. 7.From fig. 6 it can be seen that there is a peak value when i value is 0.7, flexural strength is higher at this time, and 7d has reached most
High level 5.9MPa, but when i value is 0.65 to 0.55, Strength Changes are unobvious, and intensity increasess slowly after 3d at this time.
By Fig. 7, it can be seen that, 7d resistance to compression curve reaches peak 22.6MPa in i=0.70, corresponding with flexural strength, at this time grade
With relatively rationally.It observes that intensity lower value occurs in i=0.60 and i=0.55 on 3d curve, and corresponds to age
The not high growth for illustrating fine particle and being excessively unfavorable for intensity of flexural strength.
In order to preferably compare recycled fine aggregate particle combination obtained by three kinds of grading composition design methods to mortar strength
It influences, by preferable fine aggregate particle combination obtained by three kinds of methods, the results are shown in Table 5 with respective intensities.
Best aggregate combination and intensity obtained by 5 three kinds of gradation design methods of table
Three kinds of methods obtain in comparison sheet 5 best fine aggregate gradation passes through maximum it is found that Fuller method is that index is certain
Partial size determines the gradation of particle, so small particle content is higher, and the mortar strength when three kinds of particles ratios are close
Highest, i.e., such collocation can provide the development of intensity well；K method is control minimum grain size, finds out quality by logarithm and passs
Subtract coefficient and determines gradation composition, so bulky grain and middle granule content are higher, mortar strength highest when small particle content is less；
I method is to change different index to determine and tail over percent of pass and determine proportion composition, so when bulky grain is more, middle particle and small
Mortar strength highest when granule content.From the analysis above, we can see that designing recycled fine aggregate gradation using three kinds of methods, obtain maximum strong
Gradation composition when spending has biggish difference.
Intensity results are it is found that i method is made when further relatively optimum gradation obtained by three kinds of gradation design methods combines
Gravity flowing levelling mortar intensity highest, excellent flexural strength is shown while compression strength is close with K method, production can be met
Requirement of the wallboard to flexural strength；The compression strength and flexural strength of Fuller method preparation mortar are minimum.
According to the analysis, the total body surface area that little particle excessively will lead to aggregate increases, institute when three kinds of fine aggregate particle combinations
Need slurry amount more, in the timing of paste content one, the slurry for wrapping up fine aggregate surface is insufficient, combined between slurry and aggregate it is weak, by force
It spends lower.And when little particle is very few, filling effect is inadequate, increases voidage, needs to complete filling by a part of slurry to make
With, and in one timing of paste content, the combination degree of slurry and aggregate is necessarily reduced, intensity is lower.And reasonable particle combination
Total surface area and voidage after aggregate should be made to accumulate is smaller, then in the timing of paste content one, can well with aggregate
In conjunction with raising mortar strength.So i method is more suitable for used in this experimental formula gravity flowing levelling mortar again in three kinds of gradation design methods
The gradation design of raw fine aggregate.
Embodiment 5
The present embodiment gravity flowing levelling mortar match ratio see the table below.
6 gravity flowing levelling mortar match ratio (g) of table
Embodiment 6
According to front experimental comparative analysis as a result, the present embodiment gravity flowing levelling mortar match ratio with embodiment 1, wherein again
The proportion of raw fine aggregate is bulky grain 53%, middle particle 24%, little particle 23%.The preparation method is the same as that of Example 1 for mortar.
The mortar specimen that the strength character of mortar specimen and the i value of embodiment 4 are 0.7 is essentially identical.
Above embodiment be only a specific embodiment of the invention is described, not to the scope of the present invention into
Row limits, and those skilled in the art can also do numerous modifications and variations on the basis of existing technology, set not departing from the present invention
Under the premise of meter spirit, all variations and modifications that this field ordinary engineering and technical personnel makes technical solution of the present invention,
It should fall within the scope of protection determined by the claims of the present invention.
Claims (10)
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| CN111732391A (en) * | 2020-05-26 | 2020-10-02 | 北京建筑大学 | Formula of self-leveling mortar, glass fiber reinforced recycled wallboard and preparation method thereof |
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