NO170195C - Vandig, fluid luftskum, tofase-luftskum fremstilt fra et slikt fluid luftskum og fremgangsmaate til behandling av etunderlag med et slikt fluid skum - Google Patents

Vandig, fluid luftskum, tofase-luftskum fremstilt fra et slikt fluid luftskum og fremgangsmaate til behandling av etunderlag med et slikt fluid skum

Info

Publication number
NO170195C
NO170195C NO861849A NO861849A NO170195C NO 170195 C NO170195 C NO 170195C NO 861849 A NO861849 A NO 861849A NO 861849 A NO861849 A NO 861849A NO 170195 C NO170195 C NO 170195C
Authority
NO
Norway
Prior art keywords
foam
air foam
liquid
air
fluid
Prior art date
Application number
NO861849A
Other languages
English (en)
Norwegian (no)
Other versions
NO861849L (no
NO170195B (no
Inventor
Dale Wilson Kent
Thomas William Berger
Original Assignee
Minnesota Mining & Mfg
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 Minnesota Mining & Mfg filed Critical Minnesota Mining & Mfg
Publication of NO861849L publication Critical patent/NO861849L/no
Publication of NO170195B publication Critical patent/NO170195B/no
Publication of NO170195C publication Critical patent/NO170195C/no

Links

Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
    • C08G18/40—High-molecular-weight compounds
    • C08G18/48—Polyethers
    • C08G18/4833—Polyethers containing oxyethylene units
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B1/00—Dumping solid waste
    • B09B1/004—Covering of dumping sites
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G18/00—Polymeric products of isocyanates or isothiocyanates
    • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
    • C08G18/08—Processes
    • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
    • C09K3/00—Materials not provided for elsewhere
    • C09K3/32—Materials not provided for elsewhere for absorbing liquids to remove pollution, e.g. oil, gasoline, fat
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
    • C11D1/02—Anionic compounds
    • C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
    • C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
    • C11D1/146—Sulfuric acid esters
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/0005—Other compounding ingredients characterised by their effect
    • C11D3/0094—High foaming compositions
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
    • C11D3/16—Organic compounds
    • C11D3/37—Polymers
    • C11D3/3703—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
    • C11D3/3726—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
    • C08G2101/00—Manufacture of cellular products
    • C—CHEMISTRY; METALLURGY
    • C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
    • C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
    • C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
    • C11D2111/40—Specific cleaning or washing processes
    • C11D2111/42—Application of foam or a temporary coating on the surface to be cleaned
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W30/00—Technologies for solid waste management
    • Y02W30/30—Landfill technologies aiming to mitigate methane emissions
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S521/00—Synthetic resins or natural rubbers -- part of the class 520 series
    • Y10S521/906—Polyurethane cellular product containing unreacted flame-retardant material

Landscapes

  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Environmental & Geological Engineering (AREA)
  • Materials Engineering (AREA)
  • Public Health (AREA)
  • Treatments Of Macromolecular Shaped Articles (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Polyurethanes Or Polyureas (AREA)
  • Fireproofing Substances (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Fire-Extinguishing Compositions (AREA)
  • Processing Of Solid Wastes (AREA)
  • Colloid Chemistry (AREA)
  • Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
  • Gas Separation By Absorption (AREA)
  • Sealing Material Composition (AREA)
  • Materials For Medical Uses (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
NO861849A 1985-05-28 1986-05-09 Vandig, fluid luftskum, tofase-luftskum fremstilt fra et slikt fluid luftskum og fremgangsmaate til behandling av etunderlag med et slikt fluid skum NO170195C (no)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US73793885A 1985-05-28 1985-05-28

Publications (3)

Publication Number Publication Date
NO861849L NO861849L (no) 1986-12-01
NO170195B NO170195B (no) 1992-06-15
NO170195C true NO170195C (no) 1992-09-23

Family

ID=24965885

Family Applications (1)

Application Number Title Priority Date Filing Date
NO861849A NO170195C (no) 1985-05-28 1986-05-09 Vandig, fluid luftskum, tofase-luftskum fremstilt fra et slikt fluid luftskum og fremgangsmaate til behandling av etunderlag med et slikt fluid skum

Country Status (14)

Country Link
US (1) US4795590A (ko)
EP (1) EP0206548B1 (ko)
JP (1) JPH0738884B2 (ko)
KR (1) KR940004621B1 (ko)
AT (1) ATE71117T1 (ko)
AU (1) AU583620B2 (ko)
BR (1) BR8602401A (ko)
CA (1) CA1266949A (ko)
DE (1) DE3683197D1 (ko)
ES (1) ES9200003A1 (ko)
FI (1) FI861902A (ko)
MX (1) MX169736B (ko)
NO (1) NO170195C (ko)
ZA (1) ZA863657B (ko)

Families Citing this family (45)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4795764A (en) * 1987-06-01 1989-01-03 Minnesota Mining & Manufacturing Company Poly(oxyalkylene) poly(aliphatic isocyanate) prepolymer and polyurea polymer derived therefrom by reaction with polyamine
US5026735A (en) * 1988-06-08 1991-06-25 Minnesota Mining And Manufacturing Company Treatment of hazardous materials with aqueous air foam of polyhydroxy polymer
EP0345967B1 (en) * 1988-06-08 1995-07-19 Minnesota Mining And Manufacturing Company Treatment of hazardous materials with aqueous air foam of polyhydroxy polymer
US5124363A (en) * 1988-06-08 1992-06-23 Minnesota Mining And Manufacturing Company Aqueous air foams of polyhydroxy polymer
US4923903A (en) * 1989-01-24 1990-05-08 Minnesota Mining And Manufacturing Company Dyed aqueous air foams
AU4765890A (en) * 1989-02-08 1990-08-16 Minnesota Mining And Manufacturing Company Method of sealing exposed top surface of relatively static body of liquid
IT1231037B (it) * 1989-09-25 1991-11-12 Ecodeco Spa Procedimento per interventi di manutenzione e bonifica in sicurezza su contenitori di sostanze infiammabili.
US5500220A (en) * 1989-12-15 1996-03-19 Betz Laboratories, Inc. Biological and dust control methods for bulk/granular solids
US5256419A (en) * 1989-12-15 1993-10-26 Betz Laboratories, Inc. Biological & dust control methods for bulk/granular solids
US5062996A (en) * 1990-04-20 1991-11-05 Jannette G. Kaylor Methods and compositions for sorbing flammable liquids
US5184917A (en) * 1990-07-16 1993-02-09 Polar Marine, Inc. Method of hydrocarbon decontamination
US5133991A (en) * 1990-09-18 1992-07-28 Chubb National Foam, Inc. Method for applying a biodegradable protein foam to a substrate
WO1992004942A1 (en) * 1990-09-19 1992-04-02 Atlantic Richfield Company High-stability foams for long-term suppression of hydrocarbon vapors
US5085786A (en) * 1991-01-24 1992-02-04 Minnesota Mining And Manufacturing Company Aqueous film-forming foamable solution useful as fire extinguishing concentrate
CA2080035A1 (en) * 1991-10-15 1993-04-16 George Colegrove Gelled foams
US5876134A (en) * 1992-02-14 1999-03-02 The Gillette Company Foam grip
US5372462A (en) * 1993-01-07 1994-12-13 Marathon Oil Company Polymer enhanced foam for blocking fluid flow in soil
US5510053A (en) * 1994-12-29 1996-04-23 Basf Corporation Water-blown polyurethane sealing devices and compositions for producing same
US5665288A (en) * 1994-12-29 1997-09-09 Basf Corporation Method of making water-blown polyurethane sealing devices
US5718943A (en) * 1995-07-20 1998-02-17 Rohm And Haas Company Method for producing efflorescence resistant coating on cementitious substrate
US5743841A (en) * 1996-09-27 1998-04-28 W. R. Grace & Co.-Conn. Foam composition for treating asbestos-containing materials and method of using same
US6262128B1 (en) 1998-12-16 2001-07-17 3M Innovative Properties Company Aqueous foaming compositions, foam compositions, and preparation of foam compositions
CA2298971C (en) * 1999-02-19 2008-07-22 John G. Bureaux Foam formulations
FR2791061B1 (fr) * 1999-03-19 2001-08-17 Rhodia Chimie Sa Utilisation de copolymeres derives de polyamides en tant que gelifiants de composes peu polaires
US6376566B1 (en) 2000-06-14 2002-04-23 Rhodia Inc. Agricultural foam marker compositions and use thereof
US6369122B1 (en) 2000-06-14 2002-04-09 Rhodia Inc. Agricultural foam marker compositions and use thereof
US6599872B1 (en) * 2000-07-28 2003-07-29 Ansul, Incorporated Aqueous foamable concentrates and methods
US6561733B1 (en) 2001-06-20 2003-05-13 Polymaster, Inc. Method and apparatus for treating landfills
US20030092848A1 (en) * 2001-09-11 2003-05-15 Ashok Sengupta Sprayable liner for supporting the rock surface of a mine
EP1454598A1 (en) 2001-11-22 2004-09-08 Gtl Co., Ltd. Fluorosurfactant-free foam fire-extinguisher
NL1027884C2 (nl) * 2004-12-24 2006-06-27 H En M Holding B V Stof-onderdrukkende samenstelling.
FR2893629B1 (fr) 2005-11-23 2009-10-16 Stephane Szonyi Nouveaux polyamides perfluoroalkyles lipophobes et leur obtention et leur utilisation
US7659316B2 (en) * 2007-04-13 2010-02-09 Rusmar Incorporated Foam composition
RU2490044C2 (ru) * 2007-10-16 2013-08-20 Тайко Файэр Продактс Лп Фторалкенилполи[1,6]гликозиды
US8524104B1 (en) 2008-08-28 2013-09-03 Ansul, Incorporated Fluoroalkenyl sulfate surfactants
CA2780294C (en) 2009-11-09 2018-01-16 Spotlight Technology Partners Llc Polysaccharide based hydrogels
CA2780274C (en) 2009-11-09 2018-06-26 Spotlight Technology Partners Llc Fragmented hydrogels
WO2011084256A1 (en) * 2009-12-16 2011-07-14 Owens Corning Intellectual Capital, Llc Apparatus and methods for application of foam and foam/loosefill insulation systems
FR2981658B1 (fr) * 2011-10-21 2013-12-06 Snf Sas Nouveau procede de couverture temporaire de sols contamines
CA2898558C (en) * 2013-01-11 2020-02-18 Lsc Environmental Products, Llc Odor control bulk material cover
JP6317916B2 (ja) * 2013-11-29 2018-04-25 中部電力株式会社 消火剤及び消火方法
WO2016130810A1 (en) 2015-02-13 2016-08-18 Tyco Fire Products Lp Use of an indicator as a marker in foam concentrates
EP3356027A4 (en) 2015-09-30 2019-05-22 Nanovapor Inc. METHODS AND COMPOSITIONS FOR VAPOR SUPPRESSION
US11173334B2 (en) 2016-03-18 2021-11-16 Tyco Fire Products Lp Polyorganosiloxane compounds as active ingredients in fluorine free fire suppression foams
US10780305B2 (en) 2016-03-18 2020-09-22 Tyco Fire Products Lp Organosiloxane compounds as active ingredients in fluorine free fire suppression foams

Family Cites Families (20)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3330782A (en) * 1963-11-12 1967-07-11 Union Carbide Corp Beta-(n, n-dimethylamino)alkyl ethers as catalysts for isocyanate reactions
US3562156A (en) * 1969-06-12 1971-02-09 Minnesota Mining & Mfg Fire extinguishing composition comprising a fluoroaliphatic surfactant and a fluorine-free surfactant
US3772195A (en) * 1969-06-12 1973-11-13 Minnesota Mining & Mfg Fire extinguishing composition comprising a fluoroaliphatic surfactant fluorine-free surfactant
US3719050A (en) * 1970-06-01 1973-03-06 Toho Chem Ind Co Ltd Soil stabilization method
US3805531A (en) * 1970-12-21 1974-04-23 Minnesota Mining & Mfg Consolidation of mineral aggregate
US3805532A (en) * 1970-12-21 1974-04-23 Minnesota Mining & Mfg Consolidation of aggregate material
US3894131A (en) * 1972-05-18 1975-07-08 Minnesota Mining & Mfg Poly(urethane-urea) sealants and sealing underground structures therewith
US3985688A (en) * 1972-05-18 1976-10-12 Minnesota Mining And Manufacturing Company Poly (urethane-urea) foam sealants for underground application and fluid precursors
US4118354A (en) * 1972-11-24 1978-10-03 Dai-Ichi Kogyo Seiyaku Co., Ltd. Polyurethane hydrogel and method for the production of the same
US4149599A (en) * 1976-03-25 1979-04-17 Philadelphia Suburban Corporation Fighting fire
JPS5337280A (en) * 1976-09-18 1978-04-06 Jidosha Kiki Co Apparatus for brake fluid pressure control
JPS5815146B2 (ja) * 1978-10-14 1983-03-24 ダイキン工業株式会社 泡消火剤用添加剤
US4237182A (en) * 1978-11-02 1980-12-02 W. R. Grace & Co. Method of sealing interior mine surface with a fire retardant hydrophilic polyurethane foam and resulting product
US4246146A (en) * 1979-03-09 1981-01-20 W. R. Grace & Co. Fire retardant coating system utilizing polyurethane hydrogel
US4359096A (en) * 1980-04-28 1982-11-16 Minnesota Mining And Manufacturing Company Aqueous film-forming foam fire extinguisher
US4315703A (en) * 1979-06-25 1982-02-16 Minnesota Mining And Manufacturing Company Sealing method using latex-reinforced polyurethane sewer sealing composition
US4476276A (en) * 1979-06-25 1984-10-09 Minnesota Mining And Manufacturing Company Latex-reinforced polyurethane sewer sealing composition
US4379763A (en) * 1980-10-15 1983-04-12 Minnesota Mining And Manufacturing Company Waste water treatment by chelation-gelation
DE3171226D1 (en) * 1981-09-08 1985-08-08 Dainippon Ink & Chemicals Fluorine-containing aminosulfonate
FR2553011B3 (fr) * 1983-10-11 1985-11-22 Weber Franck Procede de recouvrement d'objets, de dechets polluants, ou autres, avec une mousse synthetique durcissable, et dispositif pour la mise en oeuvre de ce procede

Also Published As

Publication number Publication date
US4795590A (en) 1989-01-03
JPH0738884B2 (ja) 1995-05-01
ATE71117T1 (de) 1992-01-15
JPS61272064A (ja) 1986-12-02
MX169736B (es) 1993-07-22
EP0206548A3 (en) 1987-09-02
KR940004621B1 (en) 1994-05-27
EP0206548A2 (en) 1986-12-30
FI861902A (fi) 1986-11-29
ZA863657B (en) 1987-12-30
NO861849L (no) 1986-12-01
CA1266949A (en) 1990-03-20
EP0206548B1 (en) 1992-01-02
NO170195B (no) 1992-06-15
DE3683197D1 (de) 1992-02-13
KR860000633A (ko) 1986-12-18
FI861902A0 (fi) 1986-05-07
AU5735986A (en) 1988-02-11
BR8602401A (pt) 1987-01-21
ES9200003A1 (es) 1991-12-16
AU583620B2 (en) 1989-05-04

Similar Documents

Publication Publication Date Title
NO170195C (no) Vandig, fluid luftskum, tofase-luftskum fremstilt fra et slikt fluid luftskum og fremgangsmaate til behandling av etunderlag med et slikt fluid skum
ES2099867T3 (es) Solucion acuosa de agente de copulacion a base de silanos y su utilizacion como capa de base para agente de estanqueidad.
ES2034161T3 (es) Metodo y aparato para formar, por pulverizacion una capa de poliuretano sobre una superficie.
AU539097B2 (en) Solid water dispersible plastics precursors containing isocyanate groups
DE3779300D1 (de) Verfahren zur herstellung mit polyurethan beschichteter textiler flaechengebilde, mit polyurethan beschichtete textile flaechengebilde und ihre verwendung zur herstellung atmungsaktiver und wasserabweisender ausruestungen.
NO168783C (no) Blanding for fremstilling av lekeplass-, sportsplass- eller tetningsbelegg innen byggesektoren, paa basis av polyurethan.
GB1518659A (en) Universal joints
EP0095421A3 (en) Clearance-type liquid lubricant seal assembly
DK605683D0 (da) Vandigt epoxy-baseret middel til overfladebelaegning og fremgangsmade til fremstilling af et sadant middel
JPS56144739A (en) Preparation of microcapsule
EP0382389A3 (en) Method of sealing the exposed top surface of a relatively static body of liquid
GB1311211A (en) Sealant
JPS5454170A (en) Sealing material
ES8704532A1 (es) Procedimiento para la fabricacion de un producto de recubrimiento apto para emplastecer
JPS57174354A (en) Method for priming surface of inorganic structural material
IT1165554B (it) Composizione legante da impiegare in rivestimenti di sigillatura ad esempio in strutture di calcestruzzo e metallo