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

1. Nordic construction IT seminar 29.-30.3.2006 Fahim Al-Neshawy ”Developing a Condition Survey Database and Hygrothermal Monitoring Method for Concrete Facades”

2. construction IT

3. 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.

4. 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

5. 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

6. 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)

7. Designing a database management system

8. The relationship of tables and fields of the database

9. Building moisture Monitored facades description Linet network system The communication software Result examples of hygrothermal monitoring Hygrothermal monitoring Ancient techniques Modern techniques

10. Source: J.F. STRAUBE, 2002

11. 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

12. 4 3 2 1 4 3 2 1 • Monitoring points • old concrete panel • Insulation • Ventilation gap • Bricks

13. 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

14. 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.

15. Light control RJ45 LIC04 controller HMP44 Sensor Twisted-pair cable Linet Nodes

16. HMP44 Sensor SHT15 Sensor PT100

17. 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

18. Installing Linet Network System

19. 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

20. concrete façade repaired by external EPS insulation and rendering coat Drying of old concrete facde

21. concrete façade repaired by external mineral wool insulation and rendering coat Drying of old concrete facde

22. 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

23. Thank you for your attention