Developing a condition survey database and hygrothermal monitoring method for concrete facades
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Nordic construction IT seminar 29.-30.3.2006 . Fahim Al-Neshawy. ”Developing a Condition Survey Database and Hygrothermal Monitoring Method for Concrete Facades”. construction IT. Effect of Maintenance Measures on Service Life of Concrete facades Prof. Seppo Huovinen

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Developing a condition survey database and hygrothermal monitoring method for concrete facades

Nordic construction IT seminar

29.-30.3.2006

Fahim Al-Neshawy

”Developing a Condition Survey Database and Hygrothermal Monitoring Method for Concrete Facades”


Developing a condition survey database and hygrothermal monitoring method for concrete facades

construction IT


Developing a condition survey database and hygrothermal monitoring method for concrete facades

  • Effect of Maintenance Measures on Service Life of Concrete facades

  • Prof. Seppo Huovinen

  • Helsinki University of Technology

  • Laboratory of Structural Engineering and Building Physics

  • The aims of the research are to:

    • Develop a database, which include deterioration parameters of condition surveys.

    • Analyze the ageing and deterioration processes of old concrete facades

    • Determine and analyze the potential methods, with which the service life of the concrete facades can be increased before fatal defects occur.

    • produce statistical calculation methods and formulae, with which the service life of the old facades can be estimated prior and after maintenance measures

    • Developing a hygrothermal monitoring method for repaired facades

    • Introduce rehabilitation measures of the concrete facades made in 1960's and 1970's.


Developing a condition survey database and hygrothermal monitoring method for concrete facades

Developing a Condition Survey Database and Hygrothermal Monitoring Method for Concrete Facades

  • Background

  • Engineering databases, have been developed in recent years.

  • Repairing and maintenance databases:

    • Bridge management system (BMS), Finnish road administration

    • ScanPrint software by ADVITAM Inc. (France) for inspection and maintenance

    • LifePlan: VTT Building and Transport for materials service life

  • These visual inspections, field and laboratory tests requires to record, report, analyze and store large quantities of data (inspection records, drawings, photos, test results, etc) for years and it is easy to get lost.

  • Moisture is the most important agent of building deterioration

  • Moister is involved in:

    • corrosion of concrete reinforcement,

    • the damaging chemical processes such as carbonation and alkali-aggregate reaction

    • freeze-thaw deterioration of concrete, stone, and masonry

  • Hygrothermal monitoring modeling


  • Developing a condition survey database and hygrothermal monitoring method for concrete facades

    • The objective of the Research:

    • •Effectively store and update this data, and allows more sophisticated search strategies,

    • •Enable data transfer to other software for further analysis,

    • •Produce detailed reports automatically for repaired building,

    • •Provide comprehensive and valuable information to decision-makers to get key-information for potential repair projects,

    • •Produce statistical calculation methods and formulae

    • •develop a hygrothermal monitoring and methods.

    • give knowledge about the building physical functioning of buildings, and


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    • Reserach methods

    • Collecting and analyzing of condition survey data

    • Analyzing repair and protection method

    • Building physics research

    • Developing a hygrothermal monitoring method

    • Designing a database management system

    • Implementation and testing of the database management system

    • Designing a web-based database management system (ASP)


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    Designing a database management system


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    The relationship of tables and fields of the database


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    Building moisture

    Monitored facades description

    Linet network system

    The communication software

    Result examples of hygrothermal monitoring

    Hygrothermal monitoring

    Ancient techniques

    Modern techniques


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    Source: J.F. STRAUBE, 2002


    Monitored facades description

    8

    8

    4

    4

    North - East

    North- West

    concrete façade repaired by demolishing the outer leaf and adding new insulation, ventilation gap and cladding with bricks

    1

    1

    Monitoring point

    Monitored facades description


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    4

    3

    2

    1

    4

    3

    2

    1

    • Monitoring points

      • old concrete panel

      • Insulation

      • Ventilation gap

      • Bricks


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    concrete façade repaired by external mineral wool insulation and rendering coat

    concrete façade repaired by external EPS insulation and rendering coat

    3

    6

    5

    4

    3

    2

    1

    1

    1

    • Monitoring points

      • Old inner concrete panel / old insulation

      • Old Insulation / old outer concrete panel

      • Old outer concrete panel

      • Old outer concrete panel / external insulation

      • Rendering coat


    Linet network system

    Linet network system

    • Linet Network System, developed by “Linet Oy (Ltd)”

    • Linet network consists of a twisted-pair cabling CAT5 system that transmits both the power and the data to and from the nodes, and a control unit (LIC04) for the network.

    • Linet network can contain up to 200 nodes with a maximum length of 1000 meters.

    • The topology of the network is totally free, either star, tree or point-to-point bus, providing for maximum flexibility in designing, installing and modifying the network.


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    Light control

    RJ45

    LIC04 controller

    HMP44 Sensor

    Twisted-pair cable

    Linet Nodes


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    HMP44 Sensor

    SHT15 Sensor

    PT100


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    The communication software

    • The RHT communication software consists of four basic parts:

    • System configuration to program nodes and sensors

    • Telnet simulation to communicate with the LIC04 control unit

    • Temperature and relative humidity calculations

    • Data output to print the hygrothermal monitoring data to the screen and to an "ASCCI" file.

    The RHT software connects to LIC04 control unit via Ethernet cable in 15 minutes intervals


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    Installing Linet Network System


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    Monitoring data examples

    concrete façade repaired by demolishing the outer leaf and adding new insulation, ventilation gap and cladding with bricks

    Monthly average relative humidity and temperature


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    concrete façade repaired by external EPS insulation and rendering coat

    Drying of old concrete facde


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    concrete façade repaired by external mineral wool insulation and rendering coat

    Drying of old concrete facde


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    • Easy installation, system design, network configuration and administration ● totally topology and polarity free network

    • Twisted-pair cabling system● data and node operating power transmitted in the same cable

    • Intensive measurement ● max. length of network cable 1000 m & Max. 200 nodes in each network

    • Nodes and sensors maintenance and calibration


    Developing a condition survey database and hygrothermal monitoring method for concrete facades

    Thank you for your attention


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