CN106227976B - A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete - Google Patents
A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete Download PDFInfo
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Abstract
The present invention provides a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete, it is adapted to the feature that construction refuse regenerated aggregate crack is more, water absorption rate is big, design mixture proportion test result fluctuation is big, compared with design of common concrete proportioning method, its method for using test to combine with calculating, and utilize skeleton volume completion method, using Design Air Voids and compression strength dual control index as main design goal, coarse-fine aggregate and natural sand are regenerated respectively using dry face state and air dried condition as design basis.Design method of the invention is simple, practical, easy to control the quality, and fluctuation range is small；Additive and admixture are not utilized, cement consumption is smaller, and recycling degree is high, economical environment-protective.
Description
Technical field
The characteristics of present invention is a kind of recycled aggregate for based on building concrete solid refuse, a kind of letter of invention
It is single, practical, easy to control the quality, and the laboratory mixing proportion design method of the small permeable regenerated aggregate concrete of fluctuation range.
Background technique
With the rapid development of China's urban housing construction and infrastructure construction, enlargement of cities requirement of engineering is removed a large amount of
Building, building room slag, the various solid refuses such as building concrete waste material are increasing.American-European and Japan and Korea S are to building waste
Regeneration is attached great importance to, and China's research and utilization is started late, and mature technical specification has not yet been formed, in its mix-design
In the general current design methods referring to normal concrete, but construction refuse regenerated aggregate is different from the characteristic of natural sand stone, such as
The features such as recycled aggregate crack is more, water absorption rate is big, design mixture proportion test result fluctuation is big, cause design result discreteness compared with
Greatly, reliability reduces, and for better resource utilization building waste, reduces waste, invents a kind of permeable recycled aggregate coagulation
The laboratory mixing proportion design method of soil has a very important significance.
Summary of the invention
Technical assignment of the invention is to solve the deficiencies in the prior art, provides a kind of experiment of permeable regenerated aggregate concrete
Room mixing proportion design method, using skeleton volume completion method, using Design Air Voids and compression strength dual control index as mainly setting
Target is counted, regenerates coarse-fine aggregate and natural sand respectively using dry face state and air dried condition as design basis, simple, practical, matter
Measure easily-controllable, and fluctuation range is small；Additive and admixture are not utilized, cement consumption is smaller, and recycling degree is high, economical environment-protective.
The technical solution adopted by the present invention to solve the technical problems is:
A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete, includes the following steps:
1) according to permeable effect requirements, design object voidage is determined；
2) according to the requirement of concrete works structure position, suitable strength grade of concrete is selected；
3) using skeleton-stamped density test, the ratio and its unit dose of regenerated coarse aggregate are determined；
4) skeleton volume completion method, unit of account water consumption and unit cement consumption are used；
5) determine the mixture proportion coefficient of sand coarse aggregate ratio, recycled fine aggregate and natural sand by trial mix, calculate recycled fine aggregate and
The unit dose of natural sand；
6) ratio of mud is calculated；
7) mechanical strength, durability, bulk density and voidage are examined；
8) match ratio of permeable regenerated aggregate concrete is determined；
Wherein, using dry face state as design basis, natural sand is made with air dried condition for regenerated coarse aggregate and recycled fine aggregate
For design basis.
Further, regenerated coarse aggregate described in step 3) is continuous size fraction regenerated coarse aggregate (1) and the regeneration of simple grain grade is thick
The mixing of both aggregates (2), using skeleton -- stamped density test is tested according to stamped density and takes into account regenerated coarse aggregate shape
At the principle of skeleton, the ratio and its unit dose of regenerated coarse aggregate are determined.
Further, step 4), in step 5), according to target voidage, using skeleton volume completion method unit of account water
Amount and unit cement consumption；By trial mix, according to slump index and water-retaining property, sticks poly- property phenomenon and determine sand coarse aggregate ratio, calculate again
The mixture proportion coefficient of raw fine aggregate and natural sand, and then calculate the unit dose of recycled fine aggregate and natural sand.
Further, sand coarse aggregate ratio range described in step 5) is 8%~15%, and design slump index is 10mm.
Further, continuous size fraction regenerated coarse aggregate (1) specification is 5~25mm, simple grain grade regenerated coarse aggregate in step 3)
(2) specification is 5~10mm.
Further, regenerated coarse aggregate described in step 3) is building concrete solid refuse.
Further, ratio of mud range is 0.2~0.3 in step 6).
Further, in step 7), mechanical strength is examined using cube specimen, should generally reach 15MPa~40MPa；
Using permeability rate, frost resistance index (north cold area) examine durability, general coefficient of permeability >=3mm/s, mass loss≤
5%, loss of strength≤25%；Bulk density is generally 1900~2100kg/m3；It surveys voidage and is greater than 10%.
Further, strength grade of concrete range described in step 2) be C15~C40, can meet drainage type retaining wall,
The requirement of revetment brick, concrete road surface or pavement brick.
Further, objective air void range described in step 1) is 10%~18%.
A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete of the invention, compared with prior art institute
The beneficial effect of generation is:
1, the method combined using test with calculating, proposes a kind of laboratory match ratio of permeable regenerated aggregate concrete
Design method, the mixing proportion design method are divided into eight steps, simple, practical, quality fluctuation is small.
2, the mix-design parameter of permeable regenerated aggregate concrete: design object voidage generally takes 10%~18%；
Design strength rate range is C15~C40；The design slump is 10mm；The specification of regenerated coarse aggregate be generally 5~25mm, 5~
Two kinds of 10mm；The ratio of mud is generally between 0.2~0.3；Sand coarse aggregate ratio is generally 8%~15%.
3, the compression strength of permeable regenerated aggregate concrete generally can reach 15MPa~40MPa；Durability index, generally
Coefficient of permeability >=3mm/s, mass loss≤5%, loss of strength≤25%；Bulk density is generally 1900~2100kg/m3。
Specific embodiment
Below with reference to embodiment, to a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete of the invention
It is described in detail below.
A kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete, includes the following steps:
1) according to permeable effect requirements, design object voidage is determined, objective air void generally takes 10%~18%.
2) according to the requirement of concrete works structure position, suitable strength grade of concrete, strength grade of concrete are selected
Range is C15~C40, can meet the requirement of drainage type retaining wall, revetment brick, concrete road surface or pavement brick.
3) using skeleton-stamped density test, the ratio and its unit dose of regenerated coarse aggregate are determined
Regenerated coarse aggregate is generally thick using the regeneration of 5~25mm specification continuous size fraction based on building concrete solid refuse
The mixing of aggregate (1) and 5~10mm specification list grade regenerated coarse aggregate (2) the two, using skeleton -- stamped density test, i.e. root
The principle that regenerated coarse aggregate forms skeleton is tested and taken into account according to stamped density, determines that the ratio of regenerated coarse aggregate and its unit are used
Amount, the unit dose of regenerated coarse aggregate are calculated as follows:
mRg(1)=mRg,0xR(1)(1+wR(1))
mRg(2)=mRg,0xR(2)(1+wR(2))
In formula: mRg(1)、mRg(2)--- two kinds of regenerated coarse aggregate dosages (dry face state), kg/m3；
γRg,0--- the stamped density of mixed regeneration coarse aggregate, kg/m3；
xR(1)、xR(2)--- the usage ratio (%) of two kinds of regenerated coarse aggregates；
wR(1)、wR(2)--- the dry face state moisture content (%) of two kinds of regenerated coarse aggregates.
4) according to target voidage, using skeleton volume completion method, unit of account water consumption and unit cement consumption.
5) determine the mixture proportion coefficient of sand coarse aggregate ratio, recycled fine aggregate and natural sand by trial mix, calculate recycled fine aggregate and
The unit dose of natural sand.
By trial mix, according to slump index and water-retaining property, sticking poly- property phenomenon and determine sand coarse aggregate ratio, sand coarse aggregate ratio is generally 8%~
15%, design slump index is 10mm, calculates the mixture proportion coefficient of recycled fine aggregate and natural sand, and then calculate regeneration
The unit dose of fine aggregate and natural sand；Calculation formula is as follows:
In formula: mRs--- the dosage of reclaimed sand, kg/m3；
ms--- the dosage of natural sand, kg/m3；
mw--- unit consumption of water, kg/m3；
mc--- unit cement consumption, kg/m3；
βs--- sand coarse aggregate ratio (%) is determined by trial mix；
λs--- reclaimed sand, natural sand mixture proportion coefficient are determined by trial mix；
ρRg(1)、ρRg(2)--- the surface drying density of two kinds of regenerated coarse aggregates, kg/m3；
ρRs--- the apparent density of reclaimed sand, kg/m3；
ρs--- the apparent density of natural sand, kg/m3；
ρw--- the density of water takes 1kg/m3；
ρc--- the density of cement, kg/m3；
P --- objective air void (%).
6) ratio of mud is calculated, ratio of mud range is 0.2~0.3, and calculation formula is as follows:
In formula: mw--- unit consumption of water, kg/m3；
mc--- unit cement consumption, kg/m3。
7) mechanical strength, durability, bulk density and voidage are examined
Mechanical strength is examined using cube specimen, should generally reach 15MPa~40MPa；Referred to using permeability rate, frost resistance
It marks (north cold area) and examines durability, general coefficient of permeability >=3mm/s, mass loss≤5%, loss of strength≤25%；
Bulk density is generally 1900~2100kg/m3；It surveys voidage and is greater than 10%.
8) match ratio of permeable regenerated aggregate concrete is determined.
Wherein, using dry face state as design basis, natural sand is made with air dried condition for regenerated coarse aggregate and recycled fine aggregate
For design basis.
Embodiment one
A kind of laboratory mixing proportion design method carrying out C15 pervious concrete using construction refuse regenerated aggregate, including
The raw material of following parts by weight: cement: water: natural sand: reclaimed sand: regenerated coarse aggregate (1): regenerated coarse aggregate (2)=252:51:
63:57:1021:448.Wherein, objective air void 18%, the ratio of mud 0.20, sand coarse aggregate ratio 8%, regenerated coarse aggregate (1), (2)
Designing quality be surface drying quality.
Wherein, it is P.O42.5 ordinary portland cement that cement, which is strength grade,；Regenerated coarse aggregate (1) is 5~25mm, then
Raw coarse aggregate (2) are 5~10mm, and surface drying density is respectively 2.314g/cm3、2.286g/cm3, water absorption rate is respectively 5.8%,
8.3%, regenerated coarse aggregate (1), (2) mixture proportion are 70:30, and the stamped density of mixed regeneration coarse aggregate is 1407kg/m3；Again
Greensand is middle sand, fineness modulus 2.87, apparent density 2.428g/cm3；Natural sand is natural river sand, and fineness modulus is
2.61, apparent density 2.610g/cm3。
The permeable regenerated aggregate concrete of the C15 examines the preparation method of test specimen for laboratory match ratio, comprising such as
Lower step:
(1) for 24 hours by regenerated coarse aggregate immersion saturation, make its sufficiently full water.Feeding wipes the water on regenerated coarse aggregate surface
Point, it is at dry face state；
(2) mechanical stirring sequence is used, concrete mixer first is added in natural sand, reclaimed sand, adds dry-mixed cement
Then the dry-mixed 1-2min of regenerated coarse aggregate is added to uniform to being uniformly mixed in 1-2min, be eventually adding water and stir 3-5min to mixing
Object is closed to be uniformly mixed；
(3) it is vibrated using machinery, by 2 loading molds of the good mixture of mixing point, slightly consolidates, be placed in standard vibration machine machine
Tool 60~120s of jolt ramming until rubber cement occurs in concrete surface, but should be avoided over vibration, prevent from isolating, for 24 hours after demoulding, standard supports
It protects to 28 day age.
Embodiment two
A kind of laboratory mixing proportion design method carrying out C20 pervious concrete using construction refuse regenerated aggregate, including
The raw material of following parts by weight: cement: water: natural sand: reclaimed sand: regenerated coarse aggregate (1): regenerated coarse aggregate (2)=310:84:
126:116:1021:448.Wherein, objective air void 15%, the ratio of mud 0.27, sand coarse aggregate ratio 15%, regenerated coarse aggregate (1),
(2) designing quality is surface drying quality.
Wherein, it is P.O42.5 ordinary portland cement that cement, which is strength grade,；Regenerated coarse aggregate (1) is 5~25mm, then
Raw coarse aggregate (2) are 5~10mm, and surface drying density is respectively 2.314g/cm3、2.286g/cm3, water absorption rate is respectively 5.8%,
8.3%, regenerated coarse aggregate (1), (2) mixture proportion are 50:50, and the stamped density of mixed regeneration coarse aggregate is 1298kg/m3；Again
Greensand is middle sand, fineness modulus 2.87, apparent density 2.428g/cm3；Natural sand is natural river sand, and fineness modulus is
2.61, apparent density 2.610g/cm3。
The permeable regenerated aggregate concrete of the C20 examines the preparation method of test specimen for laboratory match ratio, comprising such as
Lower step:
(1) for 24 hours by regenerated coarse aggregate immersion saturation, make its sufficiently full water.Feeding wipes the water on regenerated coarse aggregate surface
Point, it is at dry face state；
(2) mechanical stirring sequence is used, concrete mixer first is added in natural sand, reclaimed sand, adds dry-mixed cement 1
Then~2min is added the dry-mixed 1~2min of regenerated coarse aggregate to uniform, is eventually adding water and stirs 3~5min extremely to being uniformly mixed
Mixture is uniformly mixed；
(3) it is vibrated using machinery, by 2 loading molds of the good mixture of mixing point, slightly consolidates, be placed in standard vibration machine machine
Tool 30~60s of jolt ramming until rubber cement occurs in concrete surface, but should be avoided over vibration, prevent from isolating, for 24 hours after demoulding, standard curing
To 28 day age.
Using the molding mode manually plugged and pounded with mechanical combination of vibrating, three layers of loading die trial of concrete point, every layer artificial slotting
Under smashing 25, machinery vibrates 30s later, for 24 hours after demoulding, standard curing to 28 day age.
Embodiment three
A kind of laboratory mixing proportion design method carrying out C40 pervious concrete using construction refuse regenerated aggregate, including
The raw material of following parts by weight: cement: water: natural sand: reclaimed sand: regenerated coarse aggregate (1): regenerated coarse aggregate (2)=355:71:
98:90:1021:448.Wherein, objective air void 10%, the ratio of mud 0.3, sand coarse aggregate ratio 12%, regenerated coarse aggregate (1), (2)
Designing quality be surface drying quality.
Wherein, it is II 52.5 portland cement of P. that cement, which is strength grade,；Regenerated coarse aggregate (1) is 5~25mm, and regeneration is thick
Aggregate (2) is 5~10mm, and surface drying density is respectively 2.314g/cm3、2.286g/cm3, water absorption rate is respectively 5.8%, 8.3%,
Regenerated coarse aggregate (1), (2) mixture proportion are 60:40, and the stamped density of mixed regeneration coarse aggregate is 1349kg/m3；Reclaimed sand is
Middle sand, fineness modulus 2.87, apparent density 2.428g/cm3；Natural sand is natural river sand, fineness modulus 2.61, apparently
Density is 2.610g/cm3。
The permeable regenerated aggregate concrete of the C40 examines the preparation method of test specimen for laboratory match ratio, comprising such as
Lower step:
(1) for 24 hours by regenerated coarse aggregate immersion saturation, make its sufficiently full water.Feeding wipes the water on regenerated coarse aggregate surface
Point, it is at dry face state；
(2) mechanical stirring sequence is used, concrete mixer first is added in natural sand, reclaimed sand, adds dry-mixed cement 1
Then~2min is added the dry-mixed 1~2min of regenerated coarse aggregate to uniform, is eventually adding water and stirs 3~5min extremely to being uniformly mixed
Mixture is uniformly mixed；
(3) it is vibrated using machinery, by 2 loading molds of the good mixture of mixing point, slightly consolidates, be placed in standard vibration machine machine
Tool 50~90s of jolt ramming until rubber cement occurs in concrete surface, but should be avoided over vibration, prevent from isolating, for 24 hours after demoulding, standard curing
To 28 day age.
The performance parameter of permeable regenerated aggregate concrete obtained is as follows in above embodiments:
Claims (8)
1. a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete, which comprises the steps of:
1) according to permeable effect requirements, design object voidage is determined；
2) according to the requirement of concrete works structure position, suitable strength grade of concrete is selected；
3) using skeleton-stamped density test, the ratio and its unit dose of regenerated coarse aggregate are determined；
4) skeleton volume completion method, unit of account water consumption and unit cement consumption are used；
5) it determines the mixture proportion coefficient of sand coarse aggregate ratio, recycled fine aggregate and natural sand by trial mix, calculates recycled fine aggregate and natural
The unit dose of sand；
6) ratio of mud is calculated；
7) mechanical strength, durability, bulk density and voidage are examined；
8) match ratio of permeable regenerated aggregate concrete is determined；
Wherein, regenerated coarse aggregate and recycled fine aggregate be using dry face state as design basis, and natural sand is using air dried condition as setting
Count benchmark；
Objective air void range described in step 1) is 10%~18%；
In step 7), mechanical strength is examined using cube specimen, using permeability rate, frost resistance index test durability, Mao Ti
Product density is 1900~2100kg/m3；It surveys voidage and is greater than 10%.
2. a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete according to claim 1, feature
It is, regenerated coarse aggregate described in step 3) is both continuous size fraction regenerated coarse aggregate (1) and simple grain grade regenerated coarse aggregate (2)
Mixing, using skeleton -- the principle that regenerated coarse aggregate forms skeleton is tested according to stamped density and is taken into account in stamped density test,
Determine the ratio and its unit dose of regenerated coarse aggregate.
3. a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete according to claim 2, feature
It is, in step 4), step 5), according to target voidage, using skeleton volume completion method unit of account water consumption and unit cement
Dosage；By trial mix, according to slump index and water-retaining property, sticks poly- property phenomenon and determine sand coarse aggregate ratio, calculate recycled fine aggregate and day
The mixture proportion coefficient of right sand, and then calculate the unit dose of recycled fine aggregate and natural sand.
4. a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete according to claim 3, feature
It is, sand coarse aggregate ratio range described in step 5) is 8%~15%, and design slump index is 10mm.
5. a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete according to Claims 2 or 3 or 4,
It is characterized in that, continuous size fraction regenerated coarse aggregate (1) specification is 5~25mm, simple grain grade regenerated coarse aggregate (2) specification in step 3)
For 5~10mm.
6. a kind of laboratory mix-design side of permeable regenerated aggregate concrete according to claim 1 or 2 or 3 or 4
Method, which is characterized in that regenerated coarse aggregate described in step 3) is building concrete solid refuse.
7. a kind of laboratory mixing proportion design method of permeable regenerated aggregate concrete according to claim 3 or 4, special
Sign is that ratio of mud range is 0.2~0.3 in step 6).
8. a kind of laboratory mix-design side of permeable regenerated aggregate concrete according to claim 1 or 2 or 3 or 4
Method, which is characterized in that strength grade of concrete range described in step 2) is C15~C40.
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| CN107500656B (en) * | 2017-09-20 | 2019-08-27 | 武汉理工大学 | A kind of proportion of porous concrete mixture method based on rubber cement characteristic |
| CN109020415A (en) * | 2018-10-23 | 2018-12-18 | 广西桂海高速公路有限公司 | A kind of preparation method of regenerated aggregate pervious concrete |
| CN109711634B (en) * | 2018-12-29 | 2020-09-18 | 浙江大学 | Method for designing mix proportion of regenerated water permeable bricks based on target water permeability coefficient |
| CN111393099B (en) * | 2019-12-12 | 2022-08-30 | 中国建筑股份有限公司 | Premixed recycled aggregate pervious concrete and preparation method thereof |
| CN111170687B (en) * | 2020-02-19 | 2022-03-15 | 广东派安建材有限公司 | Method for manufacturing recycled aggregate green concrete |
| CN111848046A (en) * | 2020-07-30 | 2020-10-30 | 浙江大学 | Mix proportion design method of recycled brick-concrete pervious concrete and application thereof |
| CN113758855A (en) * | 2021-10-25 | 2021-12-07 | 中电建路桥集团有限公司 | Method for testing water permeability of pervious concrete pavement |
| CN115215616B (en) * | 2022-08-05 | 2023-06-06 | 常州大学 | Anti-rainstorm waterlogging regenerated permeable concrete applicable to heavy traffic pavement and preparation method thereof |
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