EP1609910A1 - Revetement avec effet photocatalytique - Google Patents

Revetement avec effet photocatalytique Download PDF

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Publication number
EP1609910A1
EP1609910A1 EP04425457A EP04425457A EP1609910A1 EP 1609910 A1 EP1609910 A1 EP 1609910A1 EP 04425457 A EP04425457 A EP 04425457A EP 04425457 A EP04425457 A EP 04425457A EP 1609910 A1 EP1609910 A1 EP 1609910A1
Authority
EP
European Patent Office
Prior art keywords
photocatalytic
bituminous
intermediate layer
pavement
covering
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP04425457A
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German (de)
English (en)
Inventor
C. Global Engineering and Trade S.r.l. Terruzzi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Global Engineering and Trade Srl
Original Assignee
Global Engineering and Trade Srl
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Global Engineering and Trade Srl filed Critical Global Engineering and Trade Srl
Priority to EP04425457A priority Critical patent/EP1609910A1/fr
Publication of EP1609910A1 publication Critical patent/EP1609910A1/fr
Withdrawn legal-status Critical Current

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    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/35—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them
    • E01C7/351—Toppings or surface dressings; Methods of mixing, impregnating, or spreading them with exclusively hydraulical binders; Aggregate, fillers or other additives for application on or in the surface of toppings with exclusively hydraulic binders
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
    • E01C1/005—Means permanently installed along the road for removing or neutralising exhaust gases
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C11/00—Details of pavings
    • E01C11/16—Reinforcements
    • E01C11/18—Reinforcements for cement concrete pavings
    • E—FIXED CONSTRUCTIONS
    • E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
    • E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
    • E01C7/00—Coherent pavings made in situ
    • E01C7/08—Coherent pavings made in situ made of road-metal and binders
    • E01C7/32—Coherent pavings made in situ made of road-metal and binders of courses of different kind made in situ

Definitions

  • the subject of the present invention is a pavement with photocatalytic effect, of the type specified in the preamble of Claim 1.
  • Photocatalysis is based upon the use of electrical charges or electrons made available by appropriate semiconductors when the latter are excited by appropriate electromagnetic waves.
  • a preferred semiconductor, for activation of the process of photocatalysis is titanium dioxide (TiO 2 ), preferably in the form of anatase.
  • the electrons made available by titanium dioxide constitute a negative electrical charge that binds readily to other molecules present in the environment. In particular, it binds to the molecules of oxygen (O 2 ) present in the atmosphere, constituting negative ions (O 2 - or O - ).
  • the ions O 2 - and O - are very reactive and bind to the molecules of the polluting substances present in the environment, in particular to the nitrogen oxides (NO x ), which are principally nitrogen monoxide and nitrogen dioxide (NO or NO 2 ), forming negative NO 3 - ions, or else with carbon monoxide (CO), giving rise to a molecule of carbon dioxide CO 2 .
  • NO x nitrogen oxides
  • NO or NO 2 nitrogen dioxide
  • CO carbon monoxide
  • the negative NO 3 - ions When photocatalytic substances are set in a basic cementitious matrix, the negative NO 3 - ions in turn bind readily to the positive calcium or sodium ions (Ca ++ or Na + ) dissociated from the compounds (calcium carbonate, gypsum, etc.) present in the basic cementitious matrix.
  • nitrogen oxides and carbon oxides oxidized through the photocatalytic process, but many other noxious substances such as: benzene, toluene, ethyl-benzene, m-xylene, ozone, sulphur dioxide, formaldehyde, acetaldehyde, PM x, methanol, and ethanol.
  • the stretch of road forming the subject of the test had a length of 250 m and a width of 17 m, for a total area of approximately 4000 m 2 , in a context of traffic of approximately 15 000 motor vehicles per day.
  • the photocatalytic substances must be englobed in a basic substrate, such as cement and mortar. Otherwise, the negative NO 3 - ions do not bind with the positive ions of calcium or sodium (Ca ++ or Na + ) present in the basic cementitious matrix, and at the end of the process of photocatalysis noxious acids are obtained.
  • the basic substrates are not always present on the roads, which, instead, are prevalently made of bituminous conglomerate and not of cementitious material.
  • bituminous and cementitious materials have very different elastic modulus and mechanical characteristics; in particular mortars and cements are much more rigid than the underlying bituminous layer.
  • a cementitious conglomerate can have an elastic modulus comprised between approximately 20 000 and approximately 40 000 MPa (megaPascal, or Newton per mm 2 ).
  • This elastic modulus can be more than twenty times greater than the elastic modulus of bituminous conglomerates.
  • pavements made of concrete are obtained that are substantially complete, superimposed on pavements made of bituminous conglomerate that are in turn substantially complete.
  • the technical task underlying the present invention is to devise a pavement with photocatalytic effect capable of substantially overcoming the drawbacks mentioned above.
  • an important purpose of the invention is to devise a pavement with photocatalytic effect which, albeit presenting a basic substrate of a cementitious type, applied to a base made of bituminous material, will present good characteristics of resistance to mechanical stresses.
  • Another important purpose of the invention is to devise such a pavement that will present contained costs.
  • a further purpose is to devise a pavement made in part of bituminous material and in part of cementitious material that will present a long service life.
  • the pavement with photocatalytic effect according to the invention is designated as a whole by the reference number 1.
  • bituminous substrate 2 made of bituminous material or bituminous conglomerate.
  • the bituminous substrate 2 is in itself known: it is used to make the majority of pavements and may also be made up of numerous layers.
  • the pavement 1 then comprises, in a way once again in itself known, a surface layer formed by a photocatalytic covering 3, with photocatalytic effect, made of cementitious material.
  • At least one intermediate layer 4 which is also made of cementitious material; and means of reinforcement comprising at least one base net 5, which presents an elastic modulus higher than that of the intermediate layer 4.
  • means for fixing between the intermediate layer 4 and the bituminous substrate 2 which selectively comprise engagement elements 6 developing between the net 5 and the bituminous substrate 2 and an adhesive layer 7 set between the intermediate layer 4 and the bituminous substrate 2.
  • the photocatalytic surface covering 3 is, for example, made of cementitious mortar, and the photocatalytic effect is obtained preferably by means of particles 8 made of semiconductor material, appropriately consisting of titanium dioxide, present conveniently in the form of anatase.
  • the semiconductor material is effective (as shown by Figure 1) even though in relatively small amounts, for example smaller than 3 wt% with respect of the photocatalytic covering 3.
  • the photocatalytic covering 3 is substantially "micro-reinforced" and rendered more resistant to wear and to tensile stress via dispersion therein of strands 9 made of alkali-resistant (AR) roving.
  • the roving produced by Saint-Gobain Vetrotex under the trade-mark name Cem-FIL® is chosen.
  • the strands 9 are provided in amounts preferably comprised between 2 wt% and 10 wt% with respect to the overall weight of the cementitious material forming the photocatalytic covering 3.
  • the photocatalytic covering 3 may also be substantially a paint or the like and that hence its thickness can vary considerably, for example between approximately one and ten millimetres.
  • the minimum thickness is the one typical of paints, whilst the maximum thickness generally refers to mortars.
  • the intermediate layer 4 made of cementitious material is preferably a typical cementitious conglomerate or concrete normally used for pavements. Its bottom face, designated by 4a, faces the bituminous substrate 2.
  • It preferably has a thickness greater than that of the photocatalytic covering 3 and for example has a thickness comprised between five and thirty millimetres.
  • the foundation net 5 is preferably set in the vicinity or in an area corresponding to the bottom face 4a of the intermediate layer 4.
  • It is preferably made of alkali-resistant roving, with an elastic modulus higher than that of the cementitious material of the intermediate layer.
  • the elastic modulus is comprised between approximately 20 000 and approximately 40 000 MPa, without said "micro-reinforcement”.
  • foundation net 5 a net or mesh is chosen produced by Saint-Gobain Vetrotex and called Cem-MESH®, currently designed for example to be set as reinforcement for plates or prefabricated products or to be draped vertically on the side of a building for being incorporated in a coating.
  • This net has a high elastic modulus (72 000 MPa) and a high resistance to fracture due to tensile stress.
  • said reinforcement means may comprise, in addition to the foundation net 5, also a top net 10 substantially set between the intermediate layer 4 and the photocatalytic covering 3, as highlighted in Figure 7.
  • top net 10 will be structurally identical to the foundation net 5.
  • said means for fixing the foundation net 5 to the bituminous substrate 2 envisage that the foundation net 5 will be englobed in the intermediate layer 4, preferably at a distance of a few millimetres from the bottom face 4a, and moreover that the net itself will be fixed directly to the underlying bituminous substrate 2 by means of the engagement elements 6.
  • the latter have a bottom portion 6a, which is shaped like a prod and is at least in part embedded in the bituminous substrate 2, and a top portion 6b, which projects from the bituminous substrate 2 and is designed to hook to the foundation net 5.
  • the top portion is substantially a partially open hook ( Figures 3 and 5).
  • the engagement elements 6 can be made of plastic or metal material and are preferably provided in a relatively large number.
  • the means for fixing the foundation net 5 to the bituminous substrate envisage then, additionally or alternatively, that an adhesive layer 7 will be provided between the bottom face 4a of the intermediate layer 4 and the bituminous substrate 2.
  • the adhesive layer 7 acts both directly on the intermediate layer 4 and on the foundation net 5 when the latter is in an area corresponding to the bottom face 4a, as illustrated in Figure 6, or else set at a minimal distance from said bottom face 4a.
  • the engagement elements 6 can be omitted.
  • said adhesive layer 7 will be made of an epoxy-resin-based material, possibly mixed with mineral fillers, vitreous fillers, diluents, etc., which, on the one hand, isolates the bituminous substrate 2 from the rest of the pavement, enabling a more convenient and cleaner spreading of the pavement and, on the other, engages by adhesion the intermediate layer 4, setting itself also in the strict vicinity of the net 5.
  • Epoxy resin is a thermosetting plastic material which can be applied simply by pouring and is characterized by a considerable mechanical resistance, resistance to aggressive chemical agents, resistance to low temperatures, and resistance to water.
  • a second adhesive layer 11 having an epoxy-resin base may be advantageously provided also between the photocatalytic covering 3 and the intermediate layer 4, possibly in combination with the top net 10, as shown in Figure 7.
  • the invention comprises a new process for formation of a pavement with photocatalytic effect, in which a photocatalytic covering 3 of a cementitious type is provided on top of a bituminous substrate 2.
  • Engagement is obtained by setting the foundation net 5 in the vicinity of or in a position corresponding to the bottom face 4a of the intermediate layer 4 facing the bituminous substrate and by applying selectively engagement elements 6 and an adhesive layer 7.
  • the foundation net 5 is fixed by means of engagement elements 6 to the bituminous substrate 2 in a raised position with respect to the bituminous substrate 2 itself.
  • the adhesive layer 7 is inserted between the intermediate layer 4 and the bituminous substrate 2 before the intermediate layer 4 is cast, and also this fastens the foundation net 5 to the bituminous substrate 2.
  • the process may possibly be perfected by means of insertion of a top net 10 between the photocatalytic covering 3 and the intermediate layer 4.
  • the invention enables important advantages to be achieved.
  • the photocatalytic covering 3 enables reactions of photocatalysis to take place, which, as has been explained in the introductory part of the present patent, oxidize the polluting substances, which are converted into acidic substances.
  • the acidic substances are neutralized by the basic cementitious substances present in the photocatalytic covering and give rise to the process described previously of formation of innocuous salts.
  • Figure 1 shows data acquired in Segrate on September 16, 2003. Schematically represented with a solid line is the amount of nitrogen oxides existing in the presence of a layer of photocatalytic substance, whilst the dashed line indicates the amount of nitrogen oxides in the absence of the photocatalytic layer. On the abscissa there appears the time of day and on the ordinate the amount of nitrogen oxides in parts per billion.
  • the structure described ensures a considerable resistance and an excellent distribution of stresses.
  • the foundation net 5 is in fact close to the bituminous substrate, and the engagement elements 6, as likewise the adhesive layer 7, constrain the movements of the bituminous substrate itself to the foundation net 5.
  • the pavement 1 can hence guarantee a much longer service life: its mean life can pass from one to two years in the case of the method according to the prior art, to five to eight years, thus reducing the costs and the number of cycles of repair of the pavement 1, which are frequently the cause of undesirable interruptions in the transit of vehicles.
  • the net 5 further presents excellent characteristics of resistance to corrosion, which is ideal in an aggressive environment, on account of the presence of the photocatalytic substances 8 and of components having different chemical characteristics.
  • the intermediate layer may be variously structured and even be divided into various superimposed portions. It can moreover be made either totally or partially of the same material as that of the photocatalytic covering.

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  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Road Paving Structures (AREA)
EP04425457A 2004-06-24 2004-06-24 Revetement avec effet photocatalytique Withdrawn EP1609910A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP04425457A EP1609910A1 (fr) 2004-06-24 2004-06-24 Revetement avec effet photocatalytique

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP04425457A EP1609910A1 (fr) 2004-06-24 2004-06-24 Revetement avec effet photocatalytique

Publications (1)

Publication Number Publication Date
EP1609910A1 true EP1609910A1 (fr) 2005-12-28

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Family Applications (1)

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Country Status (1)

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EP (1) EP1609910A1 (fr)

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010006617A1 (fr) * 2008-07-18 2010-01-21 Contec International Gmbh Surface de port de charge
CN102051848A (zh) * 2010-12-16 2011-05-11 河南省新开元路桥工程咨询有限公司 Hma/cc复合式路面结构及其建造方法
CN102352114A (zh) * 2011-08-10 2012-02-15 武汉工程大学 环氧沥青用紫外光固化材料及其制备方法
CN1948622B (zh) * 2006-10-31 2012-04-18 易志坚 聚合物改性水泥孔隙混凝土路面结构及施工方法
US8899871B2 (en) * 2013-03-13 2014-12-02 D&D Emulsions, Inc. Embedding photocatalytic titanium dioxide in asphalt surfaces to reduce pollutants via photocatalytic reactions
CN106702844A (zh) * 2016-11-30 2017-05-24 合诚工程咨询集团股份有限公司 低造价环保长寿命路面结构
CN107185407A (zh) * 2017-07-21 2017-09-22 江苏燕宁新材料科技发展有限公司 一种尾气降解型薄层罩面
CN107724200A (zh) * 2017-08-22 2018-02-23 江苏诺路桥工程检测有限公司 一种重载交通的沥青路面结构
CN110453565A (zh) * 2019-07-16 2019-11-15 广州大学 一种海绵城市的道路雨水收集系统
CN111116145A (zh) * 2020-01-05 2020-05-08 河北工业大学 一种干撒式光催化水泥基地面硬化剂及其应用
USRE48621E1 (en) * 2013-03-13 2021-07-06 D&D Emulsions, Inc. Embedding photocatalytic titanium dioxide in asphalt surfaces to reduce pollutants via photocatalytic reactions
CN116084223A (zh) * 2022-12-05 2023-05-09 上海建工建材科技集团股份有限公司 一种实现压电增强光催化的混凝土路面及其制作方法

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105391A (en) * 1981-08-28 1983-03-23 Dansk Beton Teknik Aps Preparing a concrete layer on asphalt
EP0505010A1 (fr) * 1991-03-22 1992-09-23 N.V. Bekaert S.A. Procédé de renforcement d'une couche de revêtement de sol
CA2207549A1 (fr) * 1997-06-12 1998-12-12 Universite De Sherbrooke Methode et systeme d'ancrage d'un revetement de beton a une surface existante
EP0919667A1 (fr) * 1996-08-16 1999-06-02 Mitsubishi Materials Corporation STRUCTURE DE PAVE SUPPRIMANT NOx
EP1020564A1 (fr) * 1998-07-29 2000-07-19 Ishihara Sangyo Kaisha, Ltd. Voie de circulation remplissant une fonction de purification d'air et procede servant a purifier de l'air pollue sur une voie de circulation
JP2003096707A (ja) * 2001-09-21 2003-04-03 Bau Kensetsu Kk 舗装体及びその形成方法

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2105391A (en) * 1981-08-28 1983-03-23 Dansk Beton Teknik Aps Preparing a concrete layer on asphalt
EP0505010A1 (fr) * 1991-03-22 1992-09-23 N.V. Bekaert S.A. Procédé de renforcement d'une couche de revêtement de sol
EP0919667A1 (fr) * 1996-08-16 1999-06-02 Mitsubishi Materials Corporation STRUCTURE DE PAVE SUPPRIMANT NOx
CA2207549A1 (fr) * 1997-06-12 1998-12-12 Universite De Sherbrooke Methode et systeme d'ancrage d'un revetement de beton a une surface existante
EP1020564A1 (fr) * 1998-07-29 2000-07-19 Ishihara Sangyo Kaisha, Ltd. Voie de circulation remplissant une fonction de purification d'air et procede servant a purifier de l'air pollue sur une voie de circulation
JP2003096707A (ja) * 2001-09-21 2003-04-03 Bau Kensetsu Kk 舗装体及びその形成方法

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 2003, no. 08 6 August 2003 (2003-08-06) *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1948622B (zh) * 2006-10-31 2012-04-18 易志坚 聚合物改性水泥孔隙混凝土路面结构及施工方法
WO2010006617A1 (fr) * 2008-07-18 2010-01-21 Contec International Gmbh Surface de port de charge
CN102051848A (zh) * 2010-12-16 2011-05-11 河南省新开元路桥工程咨询有限公司 Hma/cc复合式路面结构及其建造方法
CN102051848B (zh) * 2010-12-16 2012-08-22 河南省新开元路桥工程咨询有限公司 Hma/cc复合式路面结构及其建造方法
CN102352114A (zh) * 2011-08-10 2012-02-15 武汉工程大学 环氧沥青用紫外光固化材料及其制备方法
CN102352114B (zh) * 2011-08-10 2013-06-19 武汉工程大学 环氧沥青用紫外光固化材料及其制备方法
US8899871B2 (en) * 2013-03-13 2014-12-02 D&D Emulsions, Inc. Embedding photocatalytic titanium dioxide in asphalt surfaces to reduce pollutants via photocatalytic reactions
USRE48621E1 (en) * 2013-03-13 2021-07-06 D&D Emulsions, Inc. Embedding photocatalytic titanium dioxide in asphalt surfaces to reduce pollutants via photocatalytic reactions
CN106702844A (zh) * 2016-11-30 2017-05-24 合诚工程咨询集团股份有限公司 低造价环保长寿命路面结构
CN107185407A (zh) * 2017-07-21 2017-09-22 江苏燕宁新材料科技发展有限公司 一种尾气降解型薄层罩面
CN107724200A (zh) * 2017-08-22 2018-02-23 江苏诺路桥工程检测有限公司 一种重载交通的沥青路面结构
CN107724200B (zh) * 2017-08-22 2019-12-03 江苏一诺路桥工程检测有限公司 一种重载交通的沥青路面结构
CN110453565A (zh) * 2019-07-16 2019-11-15 广州大学 一种海绵城市的道路雨水收集系统
CN111116145A (zh) * 2020-01-05 2020-05-08 河北工业大学 一种干撒式光催化水泥基地面硬化剂及其应用
CN116084223A (zh) * 2022-12-05 2023-05-09 上海建工建材科技集团股份有限公司 一种实现压电增强光催化的混凝土路面及其制作方法

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