CN105260578B - A kind of railway engineering self-compacting concrete component preparation method - Google Patents
A kind of railway engineering self-compacting concrete component preparation method Download PDFInfo
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Abstract
The invention discloses a kind of railway engineering self-compacting concrete component preparation methods.The present invention discloses a kind of new self-compacting concrete preparation method from the angle of optimal equivalent particulate body volume.The self-compacting concrete prepared based on the present invention, no matter how variety of raw material, grade, manufacturer change, this method is coped with shifting events by sticking to a fundamental principle, the self-compacting concrete of the high comprehensive performances such as workability, self-compacting ability, crack resistance and durability can be made, once the practical puzzlement for avoiding raw materials variations in engineering and match ratio repetition test being caused to be verified repeatedly, the deficiency for compensating for existing preparation method creates a kind of more scientific, reasonable, stable railway engineering self-compacting concrete preparation technique.
Description
Technical field
The technology of the present invention belongs to concrete field, more particularly to the preparation method for being applied to self-compacting concrete.
Background technique
Railway engineering self-compacting concrete (abbreviation SCC) needs mixture to have very high mobility and in casting process
In do not isolate, not bleeding, full of template and the concrete of reinforcing bar can be wrapped up without vibrating.Need to have high fluidity, height
Stability passes through reinforcing bar gap ability and self-filling ability.SCC is relative to other engineering concrete, due to its biggish flowing
Property, higher water consumption has relatively large plastic shrinkage and creeps so that SCC is also easy to produce isolation and excreting water phenomenon.It is practical
In engineering, occur largely that mix-designs are improper since gouache ratio is excessive, particulate body volume and particulate paddle body volume are unreasonable etc.
Etc. reasons cause self-compacting concrete isolation, bleeding or case the problems such as grab bottom.
Meet the working performance of railway engineering self-compacting concrete, it is necessary to have reasonable particulate body volumetric usage.If
Particulate body volumetric usage is excessive, will cause that concrete shrinkage is big, the heat of hydration is big, reduces cracking of reinforced concrete and endurance quality.
If particulate body volumetric usage is very few, it is not able to satisfy its working performance.Railway self-compacting concrete requires more working performance
Harshness, and railway concrete especially payes attention to influence of the defects of concrete structure to the service life.Currently, although SCC concrete is matched
Composition and division in a proportion design method has very much, but there has been no a kind of stabilization, uniformly, reliable method.A certain match ratio is generally occurred within only to be applicable in
In a certain concrete engineering, good high performance concrete can be obtained, and when same match ratio be applied to different raw material (no matter
Be variety of raw material, grade also or be manufacturer's difference etc.) other engineerings when performance but difference is very big, have to thus
Again by a large number of experiments trial repeatedly, take a substantial amount of time and resource.The essential reason for this problem occur is, identical
The water requirement difference of the particulate body unit volume of volume different cultivars is very big, the bleeding rate index and laminated segregation showed
Performance difference is very big.Even, same volume, same particulate body type (for example being all level-one flyash) mobility of same grade
Energy and water requirement index are also all to define a range, and water requirement also has biggish difference, cause mix-design very tired
Difficulty, or even can not carry out.Therefore, the technical indicator for evaluating self-compacting concrete preparing materials is existing defects, in engineering still
There is not effective method to solve this problem.The present invention makes up the defect of existing index, in view of 100 mesh limestone fines body performances
Stablize, on the basis of 100 mesh limestone fines bodies, from optimal particulate body volume angle, proposes a kind of based on equivalent lime
The preparation method of the self-compacting concrete of stone particulate body bulk modulus.
Summary of the invention
In view of the technical indicator existing defects of evaluation self-compacting concrete preparing materials, existing self-compacting concrete is caused to be matched
The uncertainty and disunity of method processed lack a kind of reliability preparation method suitable for any variation of raw material.The present invention
Purpose be this problem solved in engineering, a kind of self-compaction based on equivalent limestone fines body bulk modulus is provided and is prepared
Technology, no matter how raw material change, and can make the self-compacting concrete of high comprehensive performance.
The purpose of the present invention is what is realized by following step.
A kind of railway engineering self-compacting concrete component preparation method, based on the 100 mesh limestone fines bodies that performance is stable
Equivalent volume modulus Kn, folk prescription concrete recommend water consumption, the different equivalent particulate body slurry volumes of fillibility grade concrete to push away
Recommend value VSLeR, seek needing additional equivalent particulate weight for control parameter, realize the mark of railway engineering self-compacting concrete
Standardization is prepared, it is ensured that the comprehensive performance of self-compacting concrete；Wherein：
1) equivalent limestone fines body bulk modulus Kn is determined by following methods：
Equivalent limestone fines body bulk modulus refers to that [the thin mitochondrial fraction of n reaches and 100 mesh limestone fines body phases
Same flowing degree of net paste of cement, under same volume, when identical bleeding rate required maximum water consumption Wn] and [100 mesh limestone fines
Body reaches required maximum water consumption W when certain paste flowing degree and certain bleeding rateLThe ratio between],
I.e.
Determine the equivalent limestone fines body bulk modulus Kn of the thin mitochondrial fraction of n；
2) folk prescription concrete recommends water consumption to be determined by following table：
Table 1
| Strength grade | C25~C35 | C40~C45 | C50~C55 | C60 |
| Maximum water consumption | 180 | 175 | 170 | 165 |
3) the equivalent particulate body slurry volume recommendation V of different fillibility grade concretesSLeRIt is determined by following table：
Table 2
4) quality calculation formula of additional particulate body is needed：
Symbol description in formula：
The quality of the additional particulate body of MF-, units/kg；
W-folk prescription concrete recommends water consumption, units/kg；
C-cement dosage, units/kg；
S-sand dosage, units/kg；
The dosage of the 1st kind of mineral admixture of MA1-, units/kg；
The dosage of the 2nd kind of mineral admixture of MA2-, units/kg；
MAn-n mineral admixture dosage, units/kg；
ρCThe density of-cement, unit g/cm3；
ρMA1The density of-a kind of mineral admixture, unit g/cm3；
ρMA2The density of-the 2 kind of mineral admixture, unit g/cm3；
ρMAnThe density of-n mineral admixture, unit g/cm3；
ρsγThe density of particulate body in-Machine-made Sand, unit g/cm3；
The percentage of particulate body (partial size≤0.15mm) content in γ-Machine-made Sand；
ρMFThe density of-additional particulate body, unit g/cm3；
KCThe equivalent 100 mesh limestone fines body bulk modulus of-cement；
K1The equivalent 100 mesh limestone fines body bulk modulus of-a kind of mineral admixture；
K2The equivalent 100 mesh limestone fines body bulk modulus of-the 2 kind of mineral admixture；
KnThe equivalent 100 mesh limestone fines body bulk modulus of-n mineral admixture；
KsγThe equivalent 100 mesh limestone fines body bulk modulus of particulate body in-Machine-made Sand；
KMFThe equivalent 100 mesh limestone fines body bulk modulus of-additional particulate body；
Wherein, C-cement dosage, S-sand dosage and MAn-n mineral admixture dosage press JGJ/
T283《Self-compacting concrete application technology regulation》Specification obtains.
In the present invention, designing points is proposed on the basis of 100 mesh limestone fines bodies, determine other partial sizes≤
The equivalent limestone fines body bulk modulus of the thin mitochondrial fraction of 0.15mm (cement, mineral admixture and other).As benchmark
100 mesh limestone fines body paste flowing degree measuring methods are referring to GB/T8077-2012《Concrete admixture homogeneity test side
Method》Cement paste fluidity measuring method, the preparation method of net slurry is referring to GB/T1346《Cement normal consistency water consumption, condensation
Time, the stability method of inspection》.Wherein 100 mesh limestone fines bodies replace cement in standard criterion.
The performance characteristics of the characteristics of present invention combination railway engineering self-compacting concrete and high performance water reducing agent of polyocarboxy acid, root
The folk prescription concrete water amount recommendation (being shown in Table 1) for meeting durability and construction working is provided according to practical experience, table 1 combines iron
The performance characteristics of the characteristics of road engineering self-compacting concrete and high performance water reducing agent of polyocarboxy acid, provide satisfaction according to practical experience and apply
The folk prescription concrete of work workability recommends water consumption.
According to specification JGJ/T283《Self-compacting concrete application technology regulation》Determine each material, including sand (S), stone (G),
The dosage of cement (C) cementitious material and high performance water reducing agent of polyocarboxy acid, unit are indicated with kg.
Optimal different fillibility grade coagulations are provided the present invention is based on self-compact concrete in construction workability and economy
The equivalent particulate body slurry volume recommendation V of soilSLeRIt is shown in Table 2.
Table 2 be obtained by prepare 100 mesh limestone fines bodies, Machine-made Sand (screened out 0.15mm particulate body below at
Point), stone, water and high performance water reducing agent of polyocarboxy acid be raw material mixing lime stone mixture, with lime stone fine grained and water
Total volume determines the best slurry volume that can satisfy self-compact concrete in construction workability requirement as slurry volume, and
In this, as equivalent slurry volume recommendation, test is determined to can satisfy the best of self-compact concrete in construction workability requirement
Slurry volume, obtains the corresponding different 100 mesh lime stone fine grained volumes of different fillibility grade concretes, and in this, as etc.
Imitate slurry volume recommendation.The equivalent particulate body slurry volume of the self-compacting concrete, it is reliable based on self-compacting concrete, stable
Construction working and Creative Design.
Finally determine additional particulate weight.
It is calculated according to the obtained control parameter in front and needs additional particulate body volume, and according to the principle gathered materials on the spot, it is excellent
The agstone (100 mesh or 200 mesh grades) for first selecting quality stable can also select other particulate materials for being less than 0.15mm
Material.
Self-compacting concrete all needs additional particulate body material.Particulate body material property and the serious influence coagulation of dosage
Native construction working performance.
The self-compacting concrete cohesiveness and water-retaining property prepared through the invention are excellent, and meet self-compacting concrete from
Closely knit performance (fillibility, clearance through and education resistance), crack resistance, long-term behaviour and endurance quality are all satisfied design and want
It asks.Once and changing (either type, grade or life the present invention overcomes the raw material that other preparation methods face
Produce producer), self-compacting concrete preparation is just needed through a large number of experiments trial, repeatedly several months adjustment repeatedly, or even abandons railway
The awkward situation that self-compacting concrete is prepared (match by the especially unstable lower type III track plates system self-compacting concrete of raw material
System).The present invention copes with shifting events by sticking to a fundamental principle, and the equivalent limestone fines body bulk modulus of proposition compensates for the missing and defect of index,
Using simple and convenient, solve railway engineering self-compacting concrete and prepare problem.
Specific embodiment
Embodiment 1：C40 self-compacting concrete, σ 5.0MPa, fillibility grade SF1.
Following implementation chinese raw materials service conditions are as follows：Sichuan E Sheng Cement Co., Ltd P.O42.5 normal silicate water
Mud, density 3.10g/cm3；Sichuan Juxing New Material Co., Ltd.'s JX-GBNHy2 high-performance polycarboxylic acids water reducing agent recommends volume
1%；The metakaolin of Suining factory production, density 2.58g/cm3, 30% is mixed outside；The production of Sichuan Ke Shuai additive Co., Ltd
UEA type swelling agent, density 2.71g/cm3, 10% is mixed outside；Guanghan Machine-made Sand, fineness modulus 2.67, apparent density are
2680kg/m3, loose bulk density 1450kg/m3；Being less than 0.15mm particulate body content 13.0% in sand, (wherein mountain flour is
8%, MB=1.0), density 2.70g/cm3；The continuous rubble of 5~25mm, apparent density 2680kg/m3, loose bulk density
1530kg/m3, voidage 43%, crush index 10%.Granite powder density 2.70g/cm3。
Mix calculation method is summarized as follows according to the present invention：
(1) test determines that each equivalent limestone fines body bulk modulus of particulate body is shown in Table 3
The 3 equivalent limestone fines body bulk modulus of each particulate body of table
(2) C40 water consumption recommendation is taken：W=175kg
(3) according to JGJ/T283《Self-compacting concrete application technology regulation》Specification, each material utilization amount, which is calculated, is：
Cement C=300kg；
Mineral admixture 1 (metakaolin) MA1150kg；
Mineral admixture 2 (swelling agent) MA2=50kg；
Sand S=809kg；
Stone G=884kg；
High performance water reducing agent of polyocarboxy acid 5.00kg；
(4) optimal particulate body slurry volume
1. being required and recommendation of the present invention, equivalent particulate body volume recommendation V according to fillibilitySLeR=430~440L
2. determining additional fine grained volume
This example takes VSLeR=440L needs additional fine particle mass：
Based on mix calculation result (unit of the invention：kg)
Verification experimental verification shows that prepared self-compacting concrete meets the requirement of fillibility SF1, and meets other self-compactions
Performance, crack resistance, intensity and durability are all satisfied design requirement.
The self-compacting concrete prepared using preparation method of the invention, the good result for thering is goal of the invention to be pursued.
The present invention is based on the railway engineering self-compacting concrete preparation methods of equivalent limestone fines body bulk modulus, are matched
The design requirement that concrete self-compacting ability, intensity, deformation performance and the durability of system can reach very well.No matter raw material such as
What changes, and the present invention copes with shifting events by sticking to a fundamental principle, and it is mixed to make self-compaction of good performance using the concrete that the present invention prepares
Solidifying soil provides more effective technique approach for the preparation of railway self-compacting concrete.
Claims (3)
1. a kind of railway engineering self-compacting concrete component preparation method, based on the 100 mesh limestone fines bodies etc. that performance is stable
Imitate bulk modulus Kn, folk prescription concrete recommends water consumption, equivalent particulate body slurry volume recommendation VSLeRIt is sought for control parameter
Additional equivalent particulate weight is needed, realizes that the standardization of railway engineering self-compacting concrete is prepared, it is ensured that self-compaction coagulation
The comprehensive performance of soil；Wherein：
1) equivalent limestone fines body bulk modulus Kn is determined by following methods：
Equivalent limestone fines body bulk modulus refers to that the thin mitochondrial fraction of n reaches water identical as 100 mesh limestone fines bodies
Cement paste fluidity, under same volume, when identical bleeding rate required maximum water consumption WnReach with 100 mesh limestone fines bodies
Required maximum water consumption W when certain paste flowing degree and certain bleeding rateLThe ratio between,
I.e.
Determine the equivalent limestone fines body bulk modulus Kn of the thin mitochondrial fraction of n；
2) folk prescription concrete recommends water consumption to be determined by following table：
3) the equivalent particulate body slurry volume recommendation V of different fillibility grade concretesSLeRIt is determined by following table：
4) quality calculation formula of additional particulate body is needed：
Symbol description in formula：
The quality of the additional particulate body of MF-, units/kg；
W-folk prescription concrete recommends water consumption, units/kg；
C-cement dosage, units/kg；
S-sand dosage, units/kg；
The dosage of the 1st kind of mineral admixture of MA1-, units/kg；
The dosage of the 2nd kind of mineral admixture of MA2-, units/kg；
MAn-n mineral admixture dosage, units/kg；
ρCThe density of-cement, unit g/cm3；
ρMA1The density of-a kind of mineral admixture, unit g/cm3；
ρMA2The density of-the 2 kind of mineral admixture, unit g/cm3；
ρMAnThe density of-n mineral admixture, unit g/cm3；
ρsγThe density of particulate body in-Machine-made Sand, unit g/cm3；
Particulate body partial size≤0.15mm content percentage in γ-Machine-made Sand；
ρMFThe density of-additional particulate body, unit g/cm3；
KCThe equivalent 100 mesh limestone fines body bulk modulus of-cement；
K1The equivalent 100 mesh limestone fines body bulk modulus of-a kind of mineral admixture；
K2The equivalent 100 mesh limestone fines body bulk modulus of-the 2 kind of mineral admixture；
KnThe equivalent 100 mesh limestone fines body bulk modulus of-n mineral admixture；
KsγThe equivalent 100 mesh limestone fines body bulk modulus of particulate body in-Machine-made Sand；
KMFThe equivalent 100 mesh limestone fines body bulk modulus of-additional particulate body；
Wherein, C-cement dosage, S-sand dosage and MAn-n mineral admixture dosage press JGJ/T283《From
Air-free concrete application technology regulation》Specification obtains.
2. a kind of railway engineering self-compacting concrete component preparation method according to claim 1, which is characterized in that as
100 mesh limestone fines body paste flowing degree measuring methods of benchmark are referring to GB/T8077-2012《Concrete admixture homogeneity
Test method》Cement paste fluidity measuring method, the preparation method of net slurry is referring to GB/T1346《Cement normal consistency water
Amount, setting time, the stability method of inspection》, wherein 100 mesh limestone fines bodies replace cement in standard criterion.
3. a kind of railway engineering self-compacting concrete component preparation method according to claim 1, which is characterized in that described
The additional particulate body needed in step 4), the agstone of 100 mesh or 200 mesh grades of selecting quality stable, or select it
His particulate body material less than 0.15mm.
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| CN104891902A (en) * | 2015-05-20 | 2015-09-09 | 中民筑友有限公司 | C35 low-gelatinizer self-compacting corrosion resistant concrete and preparation method thereof |
| CN104944863A (en) * | 2015-06-12 | 2015-09-30 | 中建商品混凝土西安有限公司 | Preparation method for high-strength self-compacting concrete with recycled fine aggregate |
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