CN109336501A - A kind of proportion of porous concrete mixture method based on serous coat thickness - Google Patents
A kind of proportion of porous concrete mixture method based on serous coat thickness Download PDFInfo
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- CN109336501A CN109336501A CN201811250413.XA CN201811250413A CN109336501A CN 109336501 A CN109336501 A CN 109336501A CN 201811250413 A CN201811250413 A CN 201811250413A CN 109336501 A CN109336501 A CN 109336501A
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- unit volume
- pervious concrete
- coarse aggregate
- coat thickness
- serous coat
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Classifications
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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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B28—WORKING CEMENT, CLAY, OR STONE
- B28C—PREPARING CLAY; PRODUCING MIXTURES CONTAINING CLAY OR CEMENTITIOUS MATERIAL, e.g. PLASTER
- B28C5/00—Apparatus or methods for producing mixtures of cement with other substances, e.g. slurries, mortars, porous or fibrous compositions
- B28C5/003—Methods for mixing
-
- 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
Abstract
The invention belongs to building material technical fields, it is related to a kind of proportion of porous concrete mixture method based on serous coat thickness, this method determines rubble dosage according to rubble natural packing, serous coat thickness is determined according to porosity demand, slurry volume is determined in conjunction with serous coat thickness and rubble total surface area, the dosage that cement, mineral admixture and water are determined further according to slurry volume determines water-reducing agent dosage according to powder dosage, and finally synthesis obtains pervious concrete match ratio.The present invention provides one kind can prepare controllable effective drainage porosity, the superior pervious concrete of comprehensive performance and the proportion of porous concrete mixture method based on serous coat thickness for being suitble to promote and apply.
Description
Technical field
The invention belongs to building material technical fields, are related to a kind of proportion of porous concrete mixture method, more particularly to
A kind of proportion of porous concrete mixture method based on serous coat thickness.
Background technique
Pervious concrete is without fine aggregate or to contain a small amount of fine aggregate by cement, coarse aggregate and water mixing, hard through condensing
What is formed after change has the porous structure object of the continuous hole of macroscopic view.There are more holes inside pervious concrete, have good
Permeable, gas permeability, thus have many advantages, such as: so that rainwater is restored supplement rapidly into underground water, improves to water resource
Protective effect；2. can guarantee that the root system of plant is exchanged with the normal of nature air steam, growth place is provided for microorganism,
Improve natural ecological environment；3. the phenomenon that being used for paving, eliminating rainwater splashing and slipperiness on roads, while can also reduce
It is dazzling reflective caused by due to surface gathered water；4. its unique porous structure can mitigate noise caused by vehicle driving, mention
For comfortable traffic environment；5. solar radiant heat can be sucked internal, reflection of the reduction to solar heat, to slow by pervious concrete
Solution " tropical island effect " has good effect.Functionality based on pervious concrete, it is desirable that first when carrying out mix-design to it
First to guarantee its porosity.Currently, being had conducted extensive research both at home and abroad to the mixing proportion design method of pervious concrete, but propose
Method be substantially using empirical formula method or volumetric method.Professional standard " the water-permeable cement concrete that China in 2009 is put into effect
Pavement technique regulation " also use volumetric method, but such methods consider to exist from macroscopic aspect it is certain insufficient, preparation it is permeable
Concrete performance also cannot be guaranteed.The key property of pervious concrete is exactly the binder paste by being wrapped in coarse aggregate surface
Aggregate particle is bonded together after hardening, serous coat thickness will directly affect water penetration and intensity between coarse aggregate.Cause
This, needs to propose a kind of mixing proportion design method for meeting pervious concrete characteristic, so that pervious concrete items after hardening
It is able to satisfy design requirement.
Summary of the invention
In order to solve the above technical problems in background technology, the present invention provides one kind can prepare active porosity
Rate is controllable, the superior pervious concrete of comprehensive performance and the suitable pervious concrete based on serous coat thickness promoted and applied cooperate
Compare design method.
To achieve the goals above, the present invention adopts the following technical scheme:
A kind of proportion of porous concrete mixture method based on serous coat thickness, it is characterised in that: described thick based on serous coat
The proportion of porous concrete mixture method of degree the following steps are included:
1) according to " highway engineering cement and cement concrete testing regulations " (JTG E30-2005) and " highway engineering is gathered materials
Testing regulations " requirement of (JTG E42-2005) selects suitable raw material and carries out properties test；The raw material packet
Include cement, flyash, silicon ash and coarse aggregate；
2) it is determined in unit volume according to coarse aggregate in the state of natural packing thick in the dosage and unit volume of coarse aggregate
Gather materials total surface area；
3) requirement according to Practical Project to pervious concrete porosity determines serous coat thickness；
4) determine that obtained serous coat thickness and step 2) determine that coarse aggregate is total in obtained unit volume according to step 3)
Surface area determines pervious concrete paste content in unit volume；
5) pervious concrete cement, fine coal in unit volume are determined according to pervious concrete paste content in unit volume
The dosage of ash, silicon ash and water；
6) diminishing in unit volume is determined according to the dosage of pervious concrete cement, mineral admixture and water in unit volume
Agent dosage finally obtains pervious concrete match ratio in unit volume.
Preferably, in step 2) of the present invention in unit volume the dosage of coarse aggregate specific method of determination
It is:
Have been generally acknowledged that 1m3The apparent volume of pervious concrete is mainly formed by coarse aggregate is tightly packed, the unit volume
Interior coarse aggregate content mgAre as follows:
mg=α × ρ 'g
In formula:
ρ′gFor coarse aggregate tight packing density；
α is coarse aggregate content correction factor, takes 0.98；
The specific method of determination of coarse aggregate total surface area is in unit volume in the step 2):
All coarse aggregates are considered as centered on coarse aggregate centroid using the partial size of coarse aggregate as the sphere of diameter, unit volume
Partial size is (d in interior coarse aggregatei, di+1) point meter that gathers materials tail over as αi；
(di, di+1) average grain diameter gathered materialsAre as follows:
Individually (di, di+1) aggregate particle surface area SiWith volume ViIt is respectively as follows:
Permeable coagulation (the d of unit volumei, di+1) the number n that gathers materialsiAre as follows:
In formula: ρgFor coarse aggregate apparent density；
The total volume V of coarse aggregate in unit volume are as follows:
The total surface area S of unit volume pervious concrete coarse aggregate are as follows:
Preferably, in step 4) of the present invention in unit volume pervious concrete paste content specific determination
Mode is: serous coat thickness directly affects the porosity of pervious concrete, when serous coat thickness is at 350 μm -550 μm, is corresponding with
Effect porosity is 20%-35%；
Pervious concrete slurry volume V in unit volumepAre as follows:
Vp=Sh；
Wherein:
S is the total surface area of unit volume pervious concrete coarse aggregate；
H is serous coat thickness.
Preferably, pervious concrete cement in unit volume in step 5) of the present invention, mineral admixture and
The specific method of determination of the dosage of water is:
According to volumetric method:
In formula:
mc、mf、mwThe dosage of pervious concrete cement, mineral admixture, water respectively in unit volume；
ρc、ρf、ρwThe apparent density of pervious concrete cement, mineral admixture, water respectively in unit volume；
mf=mcαf
mw=mcRw/c
In formula:
αfReplace the ratio of cement for mineral admixture；
Rw/cFor the ratio of mud of pervious concrete.
Preferably, the specific method of determination of water-reducing agent dosage is in unit volume in step 6) of the present invention:
Unit volume pervious concrete water-reducing agent dosage mpsAre as follows:
mps=(mc+mf)×αps
In formula:
αpsFor water-reducing agent volume；
mcFor the dosage of pervious concrete cement in unit volume；
mfFor the dosage of mineral admixture in unit volume.
Preferably, it is of the present invention based on the proportion of porous concrete mixture method of serous coat thickness in step 6)
Later further include:
7) intensity test, porosity test and coefficient of permeability is carried out to the pervious concrete of acquisition to test.
Compared with the prior art, the technical solution adopted in the present invention has the advantages that
The invention discloses a kind of proportion of porous concrete mixture methods based on serous coat thickness, and this method is according to rubble
Natural packing determines rubble dosage, determines serous coat thickness according to porosity demand, true in conjunction with serous coat thickness and rubble total surface area
Determine slurry volume, the dosage of cement, mineral admixture and water is determined further according to slurry volume, water-reducing agent is determined according to powder dosage
Dosage, finally synthesis obtains pervious concrete match ratio.Mixing proportion design method provided by the invention can prepare active porosity
Rate is controllable, the superior pervious concrete of comprehensive performance, is suitble to promote and apply.Proportion of porous concrete mixture method of the invention
Not only the porosity of pervious concrete is met the requirements after being hardened by layer of slurry thickness control, but also can be in mix-design
Structure micromorphology is associated with macro property.Using mixing proportion design method of the present invention, effective hole can be obtained
Gap rate is controllable, the superior pervious concrete of comprehensive performance.
Specific embodiment
Following instance is intended to illustrate invention rather than limitation of the invention further.
Embodiment 1
(1) raw material property is examined:
42.5 ordinary portland cement of P.O is selected, index is all satisfied " highway engineering cement and cement concrete test rule
Journey " (JTG E30-2005) regulation, density 3100kg/m3；The lime stone rubble of single particle size 4.75-9.5mm is selected to make
For coarse aggregate, " highway engineering gather materials testing regulations " (JTG E42-2005), testing its apparent density is 2700kg/m3, accumulation
Density is 1600kg/m3, voidage 40.7%；Select cleaning tap water, density 1000kg/m3。
(2) unit volume coarse aggregate content determines:
Coarse aggregate content m in unit volume pervious concreteg=α × ρ 'g=0.98 × 1600=1568kg.
(3) unit volume coarse aggregate total surface area calculates:
Coarse aggregate uses 4.75-9.5mm single particle size range, then it is 1 that point meter that gathers materials of the partial size, which tails over α,.
Coarse aggregate average grain diameter
The surface area of single coarse aggregate particle
The volume of single coarse aggregate particle
The number that the permeable coagulation of unit volume gathers materials
The total volume of unit volume pervious concrete coarse aggregate
The total surface area S=n of unit volume pervious concrete coarse aggregate1S1=3.068 × 106×1.594×10-4=
489.045m2
(4) serous coat thickness determines:
Default porosity is 27.50%, then corresponding to film thickness h is 450 μm.
(5) unit volume pervious concrete paste content determines:
Unit volume pervious concrete slurry volume Vp=Sh=489.045 × 0.450 × 10-3=0.2200m3
(6) dosage of unit volume pervious concrete cement, mineral admixture and water determines:
The present embodiment is not incorporated into mineral admixture, mfIt is 0.
According to volumetric method:
The present embodiment ratio of mud uses 0.25.
mw=mcRw/c=0.25mc
It can be obtained in conjunction with two formulas above: mc=384.3kg, mw=96.1kg.
(7) unit volume pervious concrete water-reducing agent dosage determines:
This implementation water-reducing agent uses the efficient powder water-reducing agent of polycarboxylic acids, water-reducing rate 26%, volume 0.1%.
mps=(mc+mf)×αps=384.3 × 0.001=0.38kg
Embodiment 2
Default porosity is 23.75%, then corresponding to film thickness h is 500 μm.Remaining raw material types and parameter with reality
It is identical to apply example 1.
Using calculation method same as Example 1, each raw material usage: cement 427.1kg, coarse aggregate is obtained
1568kg, water 106.8kg, water-reducing agent 0.43kg.
Embodiment 3
Default porosity is 20.00%, then corresponding to film thickness h is 350 μm.Remaining raw material types and parameter with reality
It is identical to apply example 1.
Using calculation method same as Example 1, each raw material usage: cement 469.8kg, coarse aggregate is obtained
1568kg, water 117.4kg, water-reducing agent 0.47kg.
Embodiment 4
Default porosity is 23.75%, then corresponding to film thickness h is 500 μm；It mixes the quality such as flyash and replaces 10%
Cement, flyash are the F class flyash for meeting " for the flyash in cement and concrete " (GB/T 1596-2017), density
For 2450kg/m3；Remaining raw material types and parameter are same as Example 1.
Using calculation method same as Example 1, each raw material usage: cement 378.7kg, flyash is obtained
42.1kg, coarse aggregate 1568kg, water 105.2kg, water-reducing agent 0.42kg.
Embodiment 5
Default porosity is 23.75%, then corresponding to film thickness h is 500 μm；Mix the water that the quality such as silicon ash replace 9%
Mud, density 2100kg/m3；Remaining raw material types and parameter are same as Example 1.
Using calculation method same as Example 1, each raw material usage: cement 379.5kg is obtained, silicon ash 37.5kg,
Coarse aggregate 1568kg, water 104.2kg, water-reducing agent 0.42kg.
The match ratio being calculated by examples detailed above is as shown in table 1
1 unit volume pervious concrete match ratio summary sheet of table
(8) match ratio is verified
By the resulting sample of above-described embodiment, 7d compression strength, 28d compression strength, effective drainage porosity and thoroughly are carried out respectively
Water coefficient test, test result are as shown in table 2.
The properties of 2 different ratio pervious concrete sample of table
As can be seen from Table 2, when serous coat thickness is at 450 μm -550 μm, each embodiment sample fully meets industry mark
Continuous porosity specified in quasi- " water-permeable cement concrete pavement technique regulation " (CJJ/T 135-2009) cannot be less than 10%,
Coefficient of permeability cannot be less than 0.5mm/s.On the basis of meeting water permeability, the intensity highest of 5 sample of embodiment is reachable
The comprehensive performance of 22.4Mpa, 5 sample of embodiment are preferable.
As serous coat thickness increases, the compression strength of pervious concrete increases, and effective drainage porosity and coefficient of permeability subtract therewith
It is small；When one timing of serous coat thickness, no matter powder is made of which kind of material, the effective drainage porosity of pervious concrete is basically unchanged,
I.e. serous coat thickness can directly determine the size of effective drainage porosity.It can be seen that the pervious concrete based on serous coat thickness cooperates
It is feasible effective than design method.
Claims (6)
1. a kind of proportion of porous concrete mixture method based on serous coat thickness, it is characterised in that: described to be based on serous coat thickness
Proportion of porous concrete mixture method the following steps are included:
1) according to " highway engineering cement and cement concrete testing regulations " (JTG E30-2005) and " highway engineering is gathered materials test
Regulation " requirement of (JTG E42-2005) selects suitable raw material and carries out properties test；The raw material include water
Mud, flyash, silicon ash and coarse aggregate；
2) coarse aggregate in the dosage and unit volume of coarse aggregate is determined in unit volume in the state of natural packing according to coarse aggregate
Total surface area；
3) requirement according to Practical Project to pervious concrete porosity determines serous coat thickness；
4) determine that obtained serous coat thickness and step 2) determine coarse aggregate total surface in obtained unit volume according to step 3)
Product determines pervious concrete paste content in unit volume；
5) pervious concrete cement, flyash, silicon in unit volume are determined according to pervious concrete paste content in unit volume
The dosage of ash and water；
6) determine that water-reducing agent is used in unit volume according to the dosage of pervious concrete cement, mineral admixture and water in unit volume
Amount, finally obtains pervious concrete match ratio in unit volume.
2. the proportion of porous concrete mixture method according to claim 1 based on serous coat thickness, it is characterised in that: institute
The specific method of determination for stating the dosage of coarse aggregate in unit volume in step 2) is:
Have been generally acknowledged that 1m3The apparent volume of pervious concrete is mainly formed by coarse aggregate is tightly packed, rough set in the unit volume
Expect dosage mgAre as follows:
mg=α × ρ 'g
In formula:
ρ′gFor coarse aggregate tight packing density；
α is coarse aggregate content correction factor, takes 0.98；
The specific method of determination of coarse aggregate total surface area is in unit volume in the step 2):
All coarse aggregates are considered as centered on coarse aggregate centroid using the partial size of coarse aggregate as the sphere of diameter, it is thick in unit volume
The middle partial size that gathers materials is (di, di+1) point meter that gathers materials tail over as αi；
(di, di+1) average grain diameter gathered materialsAre as follows:
Individually (di, di+1) aggregate particle surface area SiWith volume ViIt is respectively as follows:
Permeable coagulation (the d of unit volumei, di+1) the number n that gathers materialsiAre as follows:
In formula: ρgFor coarse aggregate apparent density；
The total volume V of coarse aggregate in unit volume are as follows:
The total surface area S of unit volume pervious concrete coarse aggregate are as follows:
3. the proportion of porous concrete mixture method according to claim 2 based on serous coat thickness, it is characterised in that: institute
The specific method of determination for stating pervious concrete paste content in unit volume in step 4) is: serous coat thickness directly affects permeable
The porosity of concrete, when serous coat thickness is at 350 μm -550 μm, corresponding effective drainage porosity is 20%-35%；
Pervious concrete slurry volume V in unit volumepAre as follows:
Vp=Sh；
Wherein:
S is the total surface area of unit volume pervious concrete coarse aggregate；
H is serous coat thickness.
4. the proportion of porous concrete mixture method according to claim 3 based on serous coat thickness, it is characterised in that: institute
The specific method of determination for stating the dosage of pervious concrete cement, mineral admixture and water in unit volume in step 5) is:
According to volumetric method:
In formula:
mc、mf、mwThe dosage of pervious concrete cement, mineral admixture, water respectively in unit volume；
ρc、ρf、ρwThe apparent density of pervious concrete cement, mineral admixture, water respectively in unit volume；
mf=mcαf
mw=mcRw/c
In formula:
αfReplace the ratio of cement for mineral admixture；
Rw/cFor the ratio of mud of pervious concrete.
5. the proportion of porous concrete mixture method according to claim 4 based on serous coat thickness, it is characterised in that: institute
The specific method of determination for stating water-reducing agent dosage in unit volume in step 6) is:
Unit volume pervious concrete water-reducing agent dosage mpsAre as follows:
mps=(mc+mf)×αps
In formula:
αpsFor water-reducing agent volume；
mcFor the dosage of pervious concrete cement in unit volume；
mfFor the dosage of mineral admixture in unit volume.
6. -5 any proportion of porous concrete mixture method based on serous coat thickness according to claim 1, feature
Be: it is described based on the proportion of porous concrete mixture method of serous coat thickness after step 6) further include:
7) intensity test, porosity test and coefficient of permeability is carried out to the pervious concrete of acquisition to test.
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109369104A (en) * | 2018-11-22 | 2019-02-22 | 中南大学 | A kind of preparation method of high-intensitive, high pervious concrete |
| CN110183186A (en) * | 2019-04-24 | 2019-08-30 | 东南大学 | A kind of preparation method of high-strength high pervious concrete |
| CN110342874A (en) * | 2019-07-10 | 2019-10-18 | 安徽省交通规划设计研究总院股份有限公司 | A kind of building waste pervious concrete preparation method |
| CN110618064A (en) * | 2019-10-24 | 2019-12-27 | 徐州中联混凝土有限公司 | Characterization method of coarse aggregate particle shape |
| CN111116136A (en) * | 2019-12-30 | 2020-05-08 | 宁波大学 | Pervious concrete mix proportion design method based on optimal volume slurry-to-bone ratio |
| CN112094082A (en) * | 2020-09-29 | 2020-12-18 | 广西壮族自治区水利科学研究院 | Preparation method of pervious concrete based on slurry-to-bone ratio and cementing material |
| CN112380708A (en) * | 2020-11-18 | 2021-02-19 | 同济大学 | High-strength pervious concrete optimization design method of cement-aggregate-additive system |
| CN112632653A (en) * | 2020-07-02 | 2021-04-09 | 中南林业科技大学 | Ecological porous concrete mix proportion design method based on aggregate slurry coating layer |
| CN114349425A (en) * | 2021-01-11 | 2022-04-15 | 安徽省交通规划设计研究总院股份有限公司 | Calculation method for porosity of pervious concrete |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109369104B (en) * | 2018-11-22 | 2021-05-18 | 中南大学 | Preparation method of high-strength and high-permeability concrete |
| CN109369104A (en) * | 2018-11-22 | 2019-02-22 | 中南大学 | A kind of preparation method of high-intensitive, high pervious concrete |
| CN110183186A (en) * | 2019-04-24 | 2019-08-30 | 东南大学 | A kind of preparation method of high-strength high pervious concrete |
| CN110183186B (en) * | 2019-04-24 | 2021-09-21 | 东南大学 | Preparation method of high-strength and high-permeability concrete |
| CN110342874A (en) * | 2019-07-10 | 2019-10-18 | 安徽省交通规划设计研究总院股份有限公司 | A kind of building waste pervious concrete preparation method |
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| CN110618064B (en) * | 2019-10-24 | 2022-11-11 | 徐州中联混凝土有限公司 | Characterization method of coarse aggregate particle shape |
| CN111116136A (en) * | 2019-12-30 | 2020-05-08 | 宁波大学 | Pervious concrete mix proportion design method based on optimal volume slurry-to-bone ratio |
| CN112632653A (en) * | 2020-07-02 | 2021-04-09 | 中南林业科技大学 | Ecological porous concrete mix proportion design method based on aggregate slurry coating layer |
| CN112094082A (en) * | 2020-09-29 | 2020-12-18 | 广西壮族自治区水利科学研究院 | Preparation method of pervious concrete based on slurry-to-bone ratio and cementing material |
| CN112094082B (en) * | 2020-09-29 | 2021-12-10 | 广西壮族自治区水利科学研究院 | Preparation method of pervious concrete based on slurry-to-bone ratio and cementing material |
| CN112380708A (en) * | 2020-11-18 | 2021-02-19 | 同济大学 | High-strength pervious concrete optimization design method of cement-aggregate-additive system |
| CN112380708B (en) * | 2020-11-18 | 2023-02-07 | 同济大学 | High-strength pervious concrete optimization design method of cement-aggregate-additive system |
| CN114349425A (en) * | 2021-01-11 | 2022-04-15 | 安徽省交通规划设计研究总院股份有限公司 | Calculation method for porosity of pervious concrete |
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Application publication date: 20190215 |