CN104402339B - The constructional method of pervious concrete - Google Patents

The constructional method of pervious concrete Download PDF

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Publication number
CN104402339B
CN104402339B CN201410665250.7A CN201410665250A CN104402339B CN 104402339 B CN104402339 B CN 104402339B CN 201410665250 A CN201410665250 A CN 201410665250A CN 104402339 B CN104402339 B CN 104402339B
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China
Prior art keywords
pervious concrete
constructional
cement
water
admixture
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CN201410665250.7A
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Chinese (zh)
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CN104402339A (en
Inventor
安百平
刘军
梁荣建
郭玉顺
景帅帅
田新鹏
卢忠淳
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天元建设集团有限公司
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Abstract

A constructional method for pervious concrete, its raw materials by weight proportioning is as follows: cement 13.1% ~ 15.9%; River sand 12.7% ~ 15.6%; Stone 59.6% ~ 66.0%; Water 3.7% ~ 3.9%; Admixture 4.5% ~ 5.0%; The raw materials by weight proportioning of described admixture is as follows: super finely ground slag 45% ~ 50%; Coarse whiting 15% ~ 20%; Terra alba 15% ~ 20%; Polypropylene fibre 3% ~ 5%; Polycarboxylic acids dehydragent 5% ~ 10%; Rubber powder 4.2% ~ 8.4%; Pigment 2% ~ 5%.Pervious concrete water-permeable prepared by the present invention, intensity, weather resistance all reach higher level.The present invention is applied in Practical Project, greatly can improve the problem of hardened ground draining difference, promotes the development of pervious concrete.

Description

The constructional method of pervious concrete
Technical field
The present invention relates to a kind of constructional method of concrete pavement material.
Background technology
The earth's surface of modern city by the building construction of Steel Concrete and fluid-tight road surface cover.Compared with natural soil road surface, common concrete road surface lacks respiratory, heat absorptivity and water-permeable, brings a series of environmental problem thereupon.At present, general concrete permeable extreme difference, causes enormous pressure to the water exhaust system on road surface, the rainwater of permeable subterranean can not can only enter river by water exhaust system, bring great burden to urban river.
Pervious concrete is a kind of preferred by strict investigation of materials, through specific preparation technology, and the concrete with continuous hole prepared.The existing certain intensity of pervious concrete, possesses again certain water-permeable.The hole of pervious concrete can create the connecting points of itself and physical environment, improves urban environment.Therefore, the hardened ground material of the improvement ground environment that pervious concrete can be fabulous.
Existing pervious concrete pavement material is generally be gelling material with cement, adds a large amount of rubble as coarse aggregate mixing.Normally first put into cement, coarse aggregate during construction, then the water adding half stirs, then add additive and stir, finally add surplus water and stir obtained.Concrete workability is poor, void distribution is uneven, intensity is low because the reason of material and preparation technology causes for existing pervious concrete, have impact on using and promoting of pervious concrete product.
Pervious concrete intensity is in the market low, cannot meet the requirement of laying high-performance road surface; Coefficient of permeability is lower, and generally its coefficient of permeability is lower than 10mm/s, cannot meet the requirement of rainwater draining in season, easily causes the generation of excess surface water phenomenon; In addition, common pervious concrete weathering resistance is poor, and freezing-thawing resistance is low, easily produces freeze-thaw damage, and that seriously hinders pervious concrete is applied to development.
Summary of the invention
The invention provides a kind of constructional method of pervious concrete, solve that existing pervious concrete intensity is low, the technical problem of bad hydraulic permeability.
The technical solution adopted for the present invention to solve the technical problems is:
This pervious concrete, its raw materials by weight proportioning is as follows:
Cement 13.1% ~ 15.9%;
River sand 12.7% ~ 15.6%;
Stone 59.6% ~ 66.0%;
Water 3.7% ~ 3.9%;
Admixture 4.5% ~ 5.0%;
The raw materials by weight proportioning of described admixture is as follows:
Super finely ground slag 45% ~ 50%;
Coarse whiting 15% ~ 20%;
Terra alba 15% ~ 20%;
Polypropylene fibre 3% ~ 5%;
Polycarboxylic acids dehydragent 5% ~ 10%;
Rubber powder 4.2% ~ 8.4%;
Pigment 2% ~ 5%.
Described cement is ordinary Portland cement, and water is ordinary tap water.
Described river sand to be fineness modulus be 2.4 ~ 2.9 medium sand.
Described stone is be the crushed granite of 5 ~ 10mm without the particle diameter of sheet structure.
Described super finely ground slag is that specific surface area is greater than 650m 2one or both combination in the flyash of/Kg, silicon ash.
Described super finely ground slag is flyash and silicon ash two kinds when combining, and the weight ratio of flyash and silicon ash is 2:1.
Described rubber powder is white powder particle, and fineness is less than 100 orders, solid content more than 99%, and ash is less than 1.0%, film-forming temperature 0 DEG C.
The constructional method of this pervious concrete, preparation process is as follows:
Step one, calculates each raw material dosage according to proportioning;
Step 2, adopts surface of aggregate pack, first the water of whole stone and weight percent 60% is stirred 1min in advance, obtain compound;
Step 3, stirs 1min by the admixture of the cement of weight percent 50% and weight percent 50% with the water of residue 40%, and adds river sand when stirring 30s, stir and obtain cement slurry;
Step 4, adds in the compound of step 2 by the cement slurry of step 3, stirs 1min, obtains mixture;
Step 5, adds cement and the admixture of residue 50%, fully stirs 2min, obtain pervious concrete slurry in the mixture of step 4;
Step 6, stirs step 5 the pervious concrete slurry obtained and is laid on roadbed, and adopts vibration/pressure bonding forming method, and while vibratory compaction, namely apply the pressure of 0.6 ~ 0.8MPa, molding time controls at 20 ~ 30s, and overlay film water seasoning;
Step 7, overlay film maintenance applies encapsulant to pervious concrete initial set, obtains finished product.
The coefficient of loose laying that described pervious concrete slurry is laid is 1.1 ~ 1.2.
Beneficial effect of the present invention is as follows:
The present invention produces at pervious concrete and mixes river sand as fine aggregate, thus adds the workability of pervious concrete, thus effectively solves the problem of pervious concrete low strength.
Polypropylene fibre is added with in admixture of the present invention, polypropylene fibre effectively can improve the workability of pervious concrete, make pervious concrete when compared with the requirement meeting workability when low water-cement ratio, and polypropylene fibre effectively can control the displacement of xln in pervious concrete in pervious concrete.Crack is stopped when encountering contiguous fiber immediately, and prevent the expansion in crack to extend, improve concrete fracture toughness property, thus improve the tensile strength of pervious concrete, effectively can improve the anti-freezing property of pervious concrete simultaneously, improve the weather resistance of pervious concrete.
Gypsum is added with in admixture of the present invention, gypsum belongs to hydraulic material, a small amount of gypsum is added in pervious concrete, be conducive in pervious concrete first time whipping process, the early strength that slurry is certain is provided, cement slurry material better wraps and gathers materials, thus avoids wrapping up cement slurry in pervious concrete secondary stirring and process of deployment and come off and the bad hydraulic permeability caused, the defect that intensity is low.
Be added with rubber powder in admixture of the present invention, rubber powder can the cohesion of refinforced cement slurry, and cohesion can impel cement slurry to be better wrapped in gather materials around, strengthen the parcel power of gathering materials.Thus avoid pervious concrete cement slurry in Construction Vibration moulding process to come off with the integument gathered materials, affect the formation of the polynuclear plane of pervious concrete, cause pervious concrete water permeability not good, strength degradation, weather resistance declines.
Constructional method of the present invention adopts the method for surface of aggregate parcel to prepare pervious concrete, a small amount of fine aggregate is mixed in batching, first at coarse aggregate surface parcel skim cement slurry, contact with the form in point or face, bond each other, thus form the equally distributed polynuclear plane of pore size, solve the problem that pervious concrete water permeability is not good, intensity is low.
The present invention is first mixed with into cement slurry with admixture with river sand with the cement of half, mixes with the coarse aggregate of prewetting, and adds remaining cement and admixture more afterwards.Object is gathered materials around to allow the cement slurry of the low water-cement ratio formed be wrapped in uniformly, makes to contact with the form in point or face, bond between gathering materials, thus improve water-permeable and the intensity of pervious concrete.
The pervious concrete adopting constructional method of the present invention to obtain and performance comparison test's data of common pervious concrete are as following table:
Performance index Intensity (MPa) Coefficient of permeability (mm/s) Freeze-thaw resistance (secondary) Abrasion loss (Kg/m 2
Common pervious concrete 30.0 12.3 85 2.281
Pervious concrete of the present invention 35.0 17.8 189 0.842
Above-mentioned testing data shows: the pervious concrete intensity adopting the method to prepare and weather resistance are all higher than common pervious concrete.The pervious concrete water-permeable adopting the method to prepare, intensity, weather resistance all reach higher level.The present invention is applied in Practical Project, greatly can improve the problem of hardened ground draining difference, promotes the development of pervious concrete.
Embodiment
Embodiment 1, this pervious concrete, its raw materials by weight proportioning is as follows:
Cement 15.9%;
River sand 15.6%;
Stone 59.6%;
Water 3.9%;
Admixture 5.0%;
The raw materials by weight proportioning of described admixture is as follows:
Super finely ground slag 45%;
Coarse whiting 20%;
Terra alba 15%;
Polypropylene fibre 5%;
Polycarboxylic acids dehydragent 7.8%;
Rubber powder 4.2%;
Pigment 3%.
Embodiment 2, this pervious concrete, its raw materials by weight proportioning is as follows:
Cement 13.1%;
River sand 12.7%;
Stone 66.0%;
Water 3.7%;
Admixture 4.5%;
The raw materials by weight proportioning of described admixture is as follows:
Super finely ground slag 47%;
Coarse whiting 15%;
Terra alba 20%;
Polypropylene fibre 3%;
Polycarboxylic acids dehydragent 5%;
Rubber powder 8%;
Pigment 2%.
Embodiment 3, this pervious concrete, its raw materials by weight proportioning is as follows:
Cement 14.5%;
River sand 13.8%;
Stone 63.1%;
Water 3.8%;
Admixture 4.8%;
The raw materials by weight proportioning of described admixture is as follows:
Super finely ground slag 46%;
Coarse whiting 16.3%;
Terra alba 16.3%;
Polypropylene fibre 4%;
Polycarboxylic acids dehydragent 7%;
Rubber powder 6.4%;
Pigment 4%.
Embodiment 4, this pervious concrete, its raw materials by weight proportioning is as follows:
Cement 13.8%;
River sand 12.9%;
Stone 64.5%;
Water 3.9%;
Admixture 4.9%;
The raw materials by weight proportioning of described admixture is as follows:
Super finely ground slag 50%;
Coarse whiting 15%;
Terra alba 15%;
Polypropylene fibre 3%;
Polycarboxylic acids dehydragent 7.4%;
Rubber powder 4.6%;
Pigment 5%.
In above-described embodiment 1-4, described cement can be ordinary Portland cement, and water can be ordinary tap water.
Described river sand is the medium sand that fineness modulus can be 2.4 ~ 2.9.
The particle diameter that described stone can be without sheet structure is the crushed granite of 5 ~ 10mm.
Described super finely ground slag can be specific surface area and is greater than 650m 2one or both combination in the flyash of/Kg, silicon ash.
Described super finely ground slag can be flyash and silicon ash two kinds when combining, and the weight ratio of flyash and silicon ash is 2:1.
Described rubber powder can be white powder particle, and fineness is less than 100 orders, solid content more than 99%, and ash is less than 1.0%, film-forming temperature 0 DEG C.
The constructional method of this pervious concrete, preparation process is as follows:
Step one, calculates each raw material dosage according to proportioning;
Step 2, adopts surface of aggregate pack, first the water of whole stone and weight percent 60% is stirred 1min in advance, obtain compound;
Step 3, stirs 1min by the admixture of the cement of weight percent 50% and weight percent 50% with the water of residue 40%, and adds river sand when stirring 30s, stir and obtain cement slurry;
Step 4, adds in the compound of step 2 by the cement slurry of step 3, stirs 1min, obtains mixture;
Step 5, adds cement and the admixture of residue 50%, fully stirs 2min, obtain pervious concrete slurry in the mixture of step 4;
Step 6, step 5 is stirred the pervious concrete slurry obtained and is laid on roadbed, coefficient of loose laying is 1.1 ~ 1.2, and adopt vibration/pressure bonding forming method, namely while vibratory compaction, apply the pressure of 0.6 ~ 0.8MPa, molding time controls at 20 ~ 30s, and overlay film water seasoning;
Step 7, overlay film maintenance applies encapsulant to pervious concrete initial set, obtains finished product.

Claims (8)

1. a constructional method for pervious concrete, is characterized in that: the raw materials by weight proportioning of pervious concrete is as follows:
Cement 13.1% ~ 15.9%;
River sand 12.7% ~ 15.6%;
Stone 59.6% ~ 66.0%;
Water 3.7% ~ 3.9%;
Admixture 4.5% ~ 5.0%;
The raw materials by weight proportioning of described admixture is as follows:
Super finely ground slag 45% ~ 50%;
Coarse whiting 15% ~ 20%;
Terra alba 15% ~ 20%;
Polypropylene fibre 3% ~ 5%;
Polycarboxylic acids dehydragent 5% ~ 10%;
Rubber powder 4.2% ~ 8.4%;
Pigment 2% ~ 5%;
Its preparation process is as follows:
Step one, calculates each raw material dosage according to proportioning;
Step 2, adopts surface of aggregate pack, first the water of whole stone and weight percent 60% is stirred 1min in advance, obtain compound;
Step 3, stirs 1min by the admixture of the cement of weight percent 50% and weight percent 50% with the water of residue 40%, and adds river sand when stirring 30s, stir and obtain cement slurry;
Step 4, adds in the compound of step 2 by the cement slurry of step 3, stirs 1min, obtains mixture;
Step 5, adds cement and the admixture of residue 50%, fully stirs 2min, obtain pervious concrete slurry in the mixture of step 4;
Step 6, stirs step 5 the pervious concrete slurry obtained and is laid on roadbed, and adopts vibration/pressure bonding forming method, and while vibratory compaction, namely apply the pressure of 0.6 ~ 0.8MPa, molding time controls at 20 ~ 30s, and overlay film water seasoning;
Step 7, overlay film maintenance applies encapsulant to pervious concrete initial set, obtains finished product.
2. the constructional method of pervious concrete according to claim 1, is characterized in that: described cement is ordinary Portland cement, and water is ordinary tap water.
3. the constructional method of pervious concrete according to claim 1, is characterized in that: described river sand to be fineness modulus be 2.4 ~ 2.9 medium sand.
4. the constructional method of pervious concrete according to claim 1, is characterized in that: described stone is be the crushed granite of 5 ~ 10mm without the particle diameter of sheet structure.
5. the constructional method of pervious concrete according to claim 1, is characterized in that: described super finely ground slag is that specific surface area is greater than 650m 2one or both combination in the flyash of/Kg, silicon ash.
6. the constructional method of pervious concrete according to claim 5, is characterized in that: described super finely ground slag is flyash and silicon ash two kinds when combining, and the weight ratio of flyash and silicon ash is 2:1.
7. the constructional method of pervious concrete according to claim 1, is characterized in that: described rubber powder is white powder particle, and fineness is less than 100 orders, solid content more than 99%, and ash is less than 1.0%, film-forming temperature 0 DEG C.
8. the constructional method of pervious concrete according to claim 1, is characterized in that: the coefficient of loose laying that described pervious concrete slurry is laid is 1.1 ~ 1.2.
CN201410665250.7A 2014-11-20 2014-11-20 The constructional method of pervious concrete CN104402339B (en)

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