CN108395177A - A kind of mix-design and preferred method of machine-made sand self-compacting concrete - Google Patents

A kind of mix-design and preferred method of machine-made sand self-compacting concrete Download PDF

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CN108395177A
CN108395177A CN201810373651.3A CN201810373651A CN108395177A CN 108395177 A CN108395177 A CN 108395177A CN 201810373651 A CN201810373651 A CN 201810373651A CN 108395177 A CN108395177 A CN 108395177A
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machine
made sand
mix
concrete
quality
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CN108395177B (en
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蒋正武
任强
张翼
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Foshan liyuda building materials Co.,Ltd.
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Tongji University
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    • 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
    • C04B28/04—Portland cements
    • G—PHYSICS
    • G05—CONTROLLING; REGULATING
    • G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
    • G05D11/00—Control of flow ratio
    • 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
    • C04B2111/00034—Physico-chemical characteristics of the mixtures
    • C04B2111/00198—Characterisation or quantities of the compositions or their ingredients expressed as mathematical formulae or equations
    • 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
    • C04B2201/52—High compression strength concretes, i.e. with a compression strength higher than about 55 N/mm2, e.g. reactive powder concrete [RPC]

Abstract

The present invention relates to a kind of mix-design of machine-made sand self-compacting concrete and preferred method, and this approach includes the following steps：1) coarse aggregate quality, the bulk density of the apparent density of coarse aggregate and coarse aggregate in powder body material, Machine-made Sand particle, folk prescription concrete are measured；2) according to performance requirement, coarse aggregate dosage and mortar volume are obtained according to mortar redundancy；3) according to design strength, water-cement ratio is determined；4) volume ratio for assuming net slurry volume and Machine-made Sand particle, calculates cement quality, Machine-made Sand quality and mix water quality；5) additive usage in machine-made sand self-compacting concrete is adjusted according to workability of concrete；6) match ratio for meeting concrete performance demand is carried out according to good-bad coefficient preferred.Compared with prior art, the present invention has many advantages, such as that step is simple, calculation amount is small, is widely used, takes into account workability and intensity.

Description

A kind of mix-design and preferred method of machine-made sand self-compacting concrete
Technical field
The present invention relates to building material technical fields, are set more particularly, to a kind of match ratio of machine-made sand self-compacting concrete Meter and preferred method.
Background technology
Concrete is most widely used as the world today, the maximum construction material of dosage, autodensing concrete almixture due to Isolation, bleeding does not occur with very high mobility and in the casting process of concrete, it can be without vibrating the case where Under fully rely on and realize dense packing effect under self gravitation effect, in a large amount of infrastructure in China and civilian construction extensively Using.As what the scarcity of river sand resource and concrete sustainable development recognized steps up, Machine-made Sand gradually substitutes river sand As the trend of concrete sustainable development.
Machine-made sand self-compacting concrete can be regarded as by mortar filling coarse aggregate accumulation gap and wrap up answering for coarse aggregate surface Condensation material, and mortar is considered as the particles filled gap of the slurry being made of cementitious material, mountain flour and water filling Machine-made Sand and wraps Wrap up in the composite material of Machine-made Sand particle surface.Machine-made Sand have particle shape is irregular, grading easily present " both ends are more, centre is few ", The features such as grain rough surface, and Machine-made Sand contains the other mountain flour (grain size of a large amount of glue material granular-grade<0.075 μm), have simultaneously Far above the fineness modulus of natural sand, these features so that the performance of machine-made sand self-compacting concrete is influenced by Machine-made Sand feature Especially pronounced, compared with river sand concrete, the easy bleeding of machine-made sand concrete, isolation and viscosity are larger.Due to failing consideration mechanism The influence of sand feature, passes through《Design of common concrete proportioning regulation》JGJ 55、《Self-compacting concrete application technology regulation》 283 Hes of JGJ/T《MIX PROPORTION DESIGN OF SELF-COMPACTING CONCRETE and construction guidbook》CCES 02 is difficult to prepare while meeting workability, strong The machine-made sand self-compacting concrete of degree and durability.In Practical Project, machine-made sand self-compacting concrete mix-design mainly with Experience is foundation, and required match ratio generally requires to obtain by a large amount of experiment work, takes time and effort, and gained match ratio Often workability and mechanical property show inconsistency, can not be by quantitative method on the basis of synthetic operation and intensity On match ratio is carried out it is preferred.
105801031 A of Chinese patent CN disclose a kind of mixing proportion design method of artificial aggregate concrete, propose to pass through Composition ratio relational design concrete mix between powder, focuses primarily upon the design between powder, does not consider powder, mechanism The relationship of sand, coarse aggregate.105974791 A of Chinese patent CN disclose a kind of concrete mix optimization system control method, By the setting and calculating of multilayer weighted value, the relationship of concrete performance and raw material is obtained, the patented method is complex, counts Calculation amount is big, not easy to use, and for machine-made sand concrete, and the introducing of mountain flour makes parameter amount increase, is less susceptible to use.
Invention content
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide a kind of machine-made sand self-compactings The mix-design and preferred method of concrete.
The purpose of the present invention can be achieved through the following technical solutions：
Mortar redundancy refers to mortar volume more than needed and accumulation sky behind mechanism sand mortar filling coarse aggregate accumulation gap The ratio of gap volume.Mortar redundancy method is designed using Machine-made Sand content of stone powder as powder body material, and proposes good and bad system Number carries out the preferred of match ratio, while ensureing workability, takes into account intensity and life requirement.
Based on this, the present invention relates to a kind of machine-made sand self-compacting concrete mix-design and preferred method, this method tools Body includes the following steps：
1) powder body material, Machine-made Sand particle, coarse aggregate quality in folk prescription concrete, the apparent density of coarse aggregate and thick are measured The bulk density of aggregate.
2) according to performance requirement, coarse aggregate dosage and mortar volume are obtained according to mortar redundancy.
Mortar redundancy FfExpression formula be：
In formula, MgFor coarse aggregate quality in folk prescription concrete, ρgFor coarse aggregate apparent density, ρ 'gIt is accumulated for coarse aggregate close Degree, VmFor mortar volume.
The mortar volume VmExpression formula be：
3) according to design strength, water-cement ratio is determined.
4) volume ratio for assuming net slurry volume and Machine-made Sand particle, calculates cement quality, Machine-made Sand quality and mix water quality Amount.
5) additive usage in machine-made sand self-compacting concrete is adjusted according to workability of concrete.
6) match ratio for meeting concrete performance demand is carried out according to good-bad coefficient preferred.
Preferably, mortar redundancy FfValue range be 1.6~1.8.
Preferably, the expression formula of water-cement ratio is：
In formula, mwFor the water consumption of every cubic meter of concrete, mbFor the gel material content of every cubic meter of concrete, fceFor The 28d of cement surveys compression strength, fcu,0For concrete preparation strength, βiThe quality hundred of cement is replaced for i-th kind of mineral admixture Score, γiFor the cementitious coefficient measured value of mineral admixture.
Preferably, cement consumption, Machine-made Sand dosage and mix water consumption are obtained by following formula：
Vm=Vp+VMs
In formula, VpFor net slurry volume, VMSFor Machine-made Sand particle volume, McFor cement quality, ρcFor cement apparent density, ρi For the apparent density of i-th kind of mineral admixture, MsFor Machine-made Sand quality, βspFor content of stone powder in Machine-made Sand, ρspIt is apparent for mountain flour Density, ρsFor Machine-made Sand apparent particle density, Mw is mix water quality (kg), ρwFor for mix water density.
Preferably, as net slurry volume VpWith Machine-made Sand particle volume VMSRatio be 0.8~1.0 when, choose 0.90.
Preferably, good-bad coefficient QfExpression formula be：
In formula, a is workability weighted value, and n is the quantity of workability index, RjFor the normalized value of workability j, RcFor 28d Compression strength normalized value.QfValue it is bigger, the comprehensive performance of concrete is better, i.e., match ratio is more excellent.
Preferably, the normalized value R of workability jjExpression formula be：
In formula, X is performance testing index, XoptFor the performance optimum value in match ratio, XworMost for the performance in match ratio Difference.
Compared with prior art, the present invention has the following advantages：
(1) the method for the present invention step is simple, calculation amount is small, is widely used；
(2) present invention considers the relationship of powder, Machine-made Sand, coarse aggregate, is based on mortar redundancy, mechanism sand powder is contained Amount carries out proportion design as powder body material, and carries out the preferred of match ratio according to good-bad coefficient, while ensureing workability, The requirement of intensity and durability is taken into account.
Description of the drawings
Fig. 1 is the flow chart of the mix-design and preferred method of a kind of machine-made sand self-compacting concrete.
Specific implementation mode
The present invention is described in detail with specific embodiment below in conjunction with the accompanying drawings.
Embodiment 1
As shown in Figure 1, the present invention relates to a kind of mix-design of machine-made sand self-compacting concrete and preferred method, the party Method includes the following steps：
S1：Measure powder body material, Machine-made Sand particle and the apparent density of coarse aggregate and the bulk density of coarse aggregate；
S2：According to performance requirement, coarse aggregate dosage and mortar volume are obtained according to mortar redundancy；
Mortar redundancy FfExpression formula be：
Mortar volume VmExpression formula be：
In above-mentioned two formula, MgFor coarse aggregate quality (kg), ρ in folk prescription concretegFor coarse aggregate apparent density (kg/ m3), ρ 'gFor coarse aggregate bulk density (kg/m3)。
Find that mortar redundancy is not a definite value, and value is by former material by a large amount of experimental study and engineering practice Expect the influence of property and design requirement.Coarse aggregate and Machine-made Sand particle shape is poor, reduction of content of stone powder, the raising of strength grade and The raising that workability requires, can cause the increase of mortar redundancy；Vice versa.Mortar redundancy FfIt generally can be 1.5 Left and right can up and down be adjusted by 0.1~0.2 amplitude of variation.
S3：According to actual design intensity, according to《Self-compacting concrete application technology regulation》The regulation of JGJ/T 283 determines Water-cement ratio；
In formula, mwFor the water consumption (kg) of every cubic meter of concrete；
mbFor the gel material content (kg) of every cubic meter of concrete；
fceCompression strength (MPa) is surveyed for the 28d of cement；
fcu,0For concrete preparation strength (MPa)；
βiThe mass percent of cement is replaced for i-th kind of mineral admixture；
γiIt, can be according to flyash 0.4, slag 0.9, silicon when no test value for the cementitious coefficient measured value of mineral admixture Ash 1.05 carries out value.
S4：It is assumed that the volume ratio of net slurry volume and Machine-made Sand particle, calculates cement consumption, Machine-made Sand dosage and mixing water and uses Amount；
Cement consumption, Machine-made Sand dosage and mix water consumption are obtained by the formula of lower section：
Vm=Vp+VMs
In formula, VpFor net slurry volume (m3)；
VMSFor Machine-made Sand particle volume (m3)；
McFor cement quality (kg)；
ρcFor cement apparent density (kg/m3)；
ρiFor the apparent density (kg/m of i-th kind of mineral admixture3)；
MsFor Machine-made Sand quality (kg)；
βspFor content of stone powder in Machine-made Sand；
ρspFor mountain flour apparent density (kg/m3)；
ρsFor Machine-made Sand apparent particle density (kg/m3)；
MwFor mix water quality (kg)；
ρwFor for mix water density (kg/m3)。
By largely testing proof, when the volume ratio of paste materials and Machine-made Sand particle is 0.8~1.0,0.90 can use.
S5：The additive usage in machine-made sand self-compacting concrete is adjusted according to workability of concrete, is being ensured Under the premise of bleeding, isolation do not occur for concrete, increase additive usage as far as possible；
S6：According to the serial match ratio of acquisition, good-bad coefficient Q is proposedfTo meet the match ratio of concrete performance demand into Row is preferred；
QfValue it is bigger, then the comprehensive performance of concrete it is better i.e. match ratio it is more excellent.QfBy to working performance of concrete and Compression strength index normalized rear weight average computation obtains：
In formula, a is workability weighted value, and ranging from 0~1/n, workability requirement is higher, then weighted value is bigger；
N is the quantity of workability index；
RjFor the normalized value of workability j；
RcFor 28d compression strength normalized values；
Wherein, the normalized value R of workability jjExpression formula be：
In formula, X is performance testing index；
XoptFor the performance optimum value in match ratio；
XworFor the performance worst-case value in match ratio.
Based on the method for the present invention, it is mixed to present embodiments provide a kind of C40 machine-made sand self-compactings applied to cushion cap, pier stud etc. Solidifying soil, wherein cement are P.O42.5 cement, 28d compression strength 55.0MPa, apparent density 3120kg/m3, flyash is apparent close Degree is 2200kg/m3, Machine-made Sand is basalt Machine-made Sand, content of stone powder 9.2%, mountain flour apparent density 2990kg/m3, thick bone Material apparent density is 2900kg/m3, bulk density 1655kg/m3；Choose different mortar redundancies (1.0,1.20,1.40, 1.60) concrete mix under is as shown in table 1.
1 C40 machine-made sand self-compacting concrete match ratios of table
Workability of concrete and intensity are tested, the concrete cohesiveness that each group match ratio obtains is good, the consideration slump, Divergence and three workability indexs of time of decaying, workability weights take 0.2,28d intensity weights to take 0.4, and it is excellent to calculate match ratio Bad coefficient, as shown in table 2.
2 C40 machine-made sand self-compacting concretes test performance of table and good-bad coefficient
As shown in Table 2, the good-bad coefficient of C40-3 groups is best, obtains C40 machine-made sand self-compacting concrete optimum mix proportions, Mortar redundancy is 1.40 at this time.
Embodiment 2
Present embodiments provide a kind of C60 machine-made sand self-compacting concretes applied to Sarasota, raw materials and implementation Example 1 is consistent, increases silicon ash, apparent density 2000kg/m in mineral admixture newly3；Choose different mortar redundancies (1.29, 1.45,1.61,1.77) concrete mix under is as shown in table 3.
3 C60 machine-made sand self-compacting concrete match ratios of table
Workability of concrete and intensity are tested, the concrete cohesiveness that each group match ratio obtains is good, the consideration slump, Divergence and three workability indexs of time of decaying, workability weights take 0.2,28d intensity weights to take 0.4, and it is excellent to calculate match ratio Bad coefficient, as shown in table 4.
4 C60 machine-made sand self-compacting concretes test performance of table and good-bad coefficient
As shown in Table 4, the good-bad coefficient of C60-2 groups is best, obtains C60 machine-made sand self-compacting concrete optimum mix proportions, Mortar redundancy is 1.45 at this time.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any The staff for being familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right It is required that protection domain subject to.

Claims (10)

1. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete, which is characterized in that this method includes following Step：
1) coarse aggregate quality, the apparent density of coarse aggregate and coarse aggregate in powder body material, Machine-made Sand particle, folk prescription concrete are measured Bulk density；
2) according to performance requirement, coarse aggregate quality and mortar volume are obtained according to mortar redundancy；
3) according to design strength, water-cement ratio is determined；
4) volume ratio for assuming net slurry volume and Machine-made Sand particle, calculates cement quality, Machine-made Sand quality and mix water quality；
5) additive usage in machine-made sand self-compacting concrete is adjusted according to workability of concrete；
6) match ratio for meeting concrete performance demand is carried out according to good-bad coefficient preferred.
2. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 1, feature It is, in the step 2), mortar redundancy FfExpression formula be：
In formula, MgFor coarse aggregate quality in folk prescription concrete, ρpFor coarse aggregate apparent density, ρ 'gFor coarse aggregate bulk density, VmFor Mortar volume.
3. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 2, feature It is, the mortar volume VmCalculation formula be：
4. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 2, feature It is, mortar redundancy FfValue range be 1.6~1.8.
5. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 3, feature It is, in the step 3), the expression formula of water-cement ratio is：
In formula, mwFor the water consumption of every cubic meter of concrete, mbFor the gel material content of every cubic meter of concrete, fceFor cement 28d survey compression strength, fcu,0For concrete preparation strength, βiThe quality percentage of cement is replaced for i-th kind of mineral admixture Number, γiFor the cementitious coefficient measured value of mineral admixture.
6. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 5, feature It is, in the step 4), cement quality, Machine-made Sand quality and mix water quality are obtained by following formula：
Vm=Vp+VMS
In formula, VpFor net slurry volume, VMSFor Machine-made Sand particle volume, McFor cement quality, ρcFor cement apparent density, ρiIt is i-th The apparent density of kind mineral admixture, MsFor Machine-made Sand quality, βspFor content of stone powder in Machine-made Sand, ρspFor mountain flour apparent density, ρsFor Machine-made Sand apparent particle density, MwFor mix water quality (kg), ρwFor for mix water density.
7. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 6, feature It is, as net slurry volume VpWith Machine-made Sand particle volume VMSRatio be 0.8~1.0 when, choose 0.90.
8. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 7, feature It is, in the step 6), good-bad coefficient QfExpression formula be：
In formula, a is workability weighted value, and n is the quantity of workability index, RjFor the normalized value of workability j, RcFor 28d resistance to compressions Intensity normalized value.
9. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 8, feature It is, the normalized value R of workability jjExpression formula be：
In formula, X is performance testing index, XoptFor the performance optimum value in match ratio, XworFor the performance worst-case value in match ratio.
10. the mix-design and preferred method of a kind of machine-made sand self-compacting concrete according to claim 8, feature It is, QfValue it is bigger, the comprehensive performance of machine-made sand self-compacting concrete is better, and match ratio is more excellent.
CN201810373651.3A 2018-04-24 2018-04-24 Mix proportion design and optimization method of machine-made sand self-compacting concrete Active CN108395177B (en)

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CN109053075A (en) * 2018-08-30 2018-12-21 中国十七冶集团有限公司 A kind of highway engineering high-performance machine-made sand concrete preparation method
CN109684783A (en) * 2019-02-26 2019-04-26 重庆交通大学 A kind of MIX PROPORTION DESIGN OF SELF-COMPACTING CONCRETE method based on mortar rheological behavior
CN110317013A (en) * 2019-04-29 2019-10-11 武汉理工大学 A kind of low-quality C80 machine-made sand concrete and preparation method thereof to gather materials
CN110502723A (en) * 2019-07-26 2019-11-26 北京建筑大学 A kind of ready-mixed concrete mixing proportion design method
CN111056791A (en) * 2019-12-16 2020-04-24 保利长大工程有限公司 Steel shell immersed tube self-compacting concrete mix proportion design method and concrete
CN111242483A (en) * 2020-01-14 2020-06-05 上海隧道工程有限公司 Machine-made sand gradation determination method and system
CN111308056A (en) * 2020-04-17 2020-06-19 葛洲坝集团试验检测有限公司 Concrete slump inference method based on mix proportion and raw material performance
CN112142398A (en) * 2020-09-04 2020-12-29 同济大学 Quantitative design method for mix proportion of machine-made sand self-compacting concrete based on aggregate particle shape
CN112668176A (en) * 2020-12-25 2021-04-16 中铁大桥局集团有限公司 Design method of ultra-high performance fiber reinforced concrete containing coarse aggregate
CN112851222A (en) * 2021-02-24 2021-05-28 中铁六局集团有限公司 Machine-made sand self-compacting concrete mix proportion design method based on establishment of optimal flowing system
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CN113345537A (en) * 2020-12-03 2021-09-03 王浚珲 Method for automatically producing concrete proportion
CN113744813A (en) * 2021-09-07 2021-12-03 交通运输部公路科学研究所 Design method of high-durability machine-made sand concrete mixing proportion
CN113836738A (en) * 2021-09-29 2021-12-24 中铁二十四局集团有限公司 SCC mix proportion design method based on aggregate filling and efficiency factor
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CN109053075A (en) * 2018-08-30 2018-12-21 中国十七冶集团有限公司 A kind of highway engineering high-performance machine-made sand concrete preparation method
CN109684783A (en) * 2019-02-26 2019-04-26 重庆交通大学 A kind of MIX PROPORTION DESIGN OF SELF-COMPACTING CONCRETE method based on mortar rheological behavior
CN109684783B (en) * 2019-02-26 2023-02-24 重庆交通大学 Self-compacting concrete mix proportion design method based on mortar rheological property
CN110317013A (en) * 2019-04-29 2019-10-11 武汉理工大学 A kind of low-quality C80 machine-made sand concrete and preparation method thereof to gather materials
CN110502723A (en) * 2019-07-26 2019-11-26 北京建筑大学 A kind of ready-mixed concrete mixing proportion design method
CN111056791A (en) * 2019-12-16 2020-04-24 保利长大工程有限公司 Steel shell immersed tube self-compacting concrete mix proportion design method and concrete
CN113125296A (en) * 2019-12-31 2021-07-16 江苏苏博特新材料股份有限公司 Method for testing initial mix proportion of hardened concrete
CN111242483A (en) * 2020-01-14 2020-06-05 上海隧道工程有限公司 Machine-made sand gradation determination method and system
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CN112142398A (en) * 2020-09-04 2020-12-29 同济大学 Quantitative design method for mix proportion of machine-made sand self-compacting concrete based on aggregate particle shape
CN112142398B (en) * 2020-09-04 2021-07-20 同济大学 Quantitative design method for mix proportion of machine-made sand self-compacting concrete based on aggregate particle shape
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CN112668176A (en) * 2020-12-25 2021-04-16 中铁大桥局集团有限公司 Design method of ultra-high performance fiber reinforced concrete containing coarse aggregate
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CN113336489B (en) * 2021-05-08 2022-06-03 西安科技大学 Method for mixing proportion of machine-made sand self-compacting lightweight aggregate concrete
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