helsinki university of technology ”developing a condition survey database and hygrothermal...
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HELSINKI UNIVERSITY OF TECHNOLOGY
”Developing a Condition Survey Database and Hygrothermal Monitoring Method for
Concrete Facades”
Fahim Al-Neshawy
Nordic construction IT seminar 29.-30.3.2006
HELSINKI UNIVERSITY OF TECHNOLOGY
construction IT
HELSINKI UNIVERSITY OF TECHNOLOGY
Effect of Maintenance Measures on Service Life of Concrete facades
Prof. Seppo HuovinenHelsinki 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.
HELSINKI UNIVERSITY OF TECHNOLOGY
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
HELSINKI UNIVERSITY OF TECHNOLOGY
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
HELSINKI UNIVERSITY OF TECHNOLOGY
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)
HELSINKI UNIVERSITY OF TECHNOLOGY
Designing a database management system
HELSINKI UNIVERSITY OF TECHNOLOGY
The relationship of tables and fields of the database
HELSINKI UNIVERSITY OF TECHNOLOGY
• Building moisture
• Monitored facades description
• Linet network system
• The communication software
• Result examples of hygrothermal monitoring
Hygrothermal monitoring
Ancient techniques Modern techniques
HELSINKI UNIVERSITY OF TECHNOLOGY Source: J.F. STRAUBE, 2002
HELSINKI UNIVERSITY OF TECHNOLOGY
Monitored facades description
1
4
8
8
4
1
Monitoring point
North- West
North - East
concrete façade repaired by demolishing the outer leaf and adding new insulation, ventilation gap and cladding with bricks
HELSINKI UNIVERSITY OF TECHNOLOGY
Monitoring points1. old concrete panel2. Insulation3. Ventilation gap4. Bricks
1234
1234
HELSINKI UNIVERSITY OF TECHNOLOGY
6
1
Monitoring points1. Old inner concrete panel / old insulation2. Old Insulation / old outer concrete panel3. Old outer concrete panel 4. Old outer concrete panel / external insulation5. Rendering coat
concrete façade repaired by external mineral wool insulation and rendering coat
12345
1
3
concrete façade repaired by external EPS insulation and rendering coat
HELSINKI UNIVERSITY OF TECHNOLOGY
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.
HELSINKI UNIVERSITY OF TECHNOLOGY
LIC04 controller
HMP44 Sensor
Linet Nodes
Twisted-pair cable
RJ45
Light control
HELSINKI UNIVERSITY OF TECHNOLOGY
HMP44 Sensor
SHT15 Sensor
PT100
HELSINKI UNIVERSITY OF TECHNOLOGY
The communication software
The RHT software connects to LIC04 control unit via Ethernet cable in 15
minutes intervals
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.
HELSINKI UNIVERSITY OF TECHNOLOGY
Installing Linet Network System
HELSINKI UNIVERSITY OF TECHNOLOGY
concrete façade repaired by demolishing the outer leaf and adding new insulation, ventilation gap and cladding with bricks
Monthly average relative humidity and temperature
Monitoring data examples
HELSINKI UNIVERSITY OF TECHNOLOGY
concrete façade repaired by external EPS insulation and rendering coat
Drying of old concrete facde
HELSINKI UNIVERSITY OF TECHNOLOGY
concrete façade repaired by external mineral wool insulation and rendering coat
Drying of old concrete facde
HELSINKI UNIVERSITY OF TECHNOLOGY
+ 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
HELSINKI UNIVERSITY OF TECHNOLOGY
Thank you for your attention