Building materials laboratory
Standardised building material tests on concrete, aggregates and cements as well as material tests on masonry samples and mortars, screeds and wood building materials are possible in the laboratory and partly on the building itself. For this purpose, the Department of Civil Engineering has a large number of technically high-quality devices at its disposal.
Services
Compressive strength test
The servo-hydraulic compression testing machine type DrMB 300/1 for compression strength testing has a maximum load range of 3000 kN. Test specimens made of different materials up to a size of 500 mm (L) x 500 mm (W) x 1000 mm (H) can be tested here. The press is particularly suitable for testing standard concrete test specimens. In the bending tensile test, test specimens up to a size of 130 mm (L) x 220 mm (W) x 500 mm (H) can be tested. Split tensile tests are also possible.
Tensile and compressive strength test
- The electromechanical tensile testing machine type Inspekt 250 has a maximum load range of 250 kN. Different tensile specimens with a maximum diameter of 32 mm and up to 1000 mm length can be tested here.
- The servo-hydraulic tensile and compression testing machine type ZD 10 has a maximum load range of 100 kN. Different test specimens with a maximum diameter of 20 mm and a length of up to 500 mm in the tensile test and a maximum diameter of 160 mm and a length of up to 500 mm in the compression test can be tested.
- The electromechanical tensile testing machine type Z 2.5 has a maximum load range of 2.5 kN. Different tensile specimens with a maximum diameter of 5 mm and up to 800 mm in length can be tested here.
Water impermeability test (concrete)
Standardised concrete tests
- The cement bending tensile and compressive strength is tested in accordance with standards using the hydraulic press type DigiMaxx C-20 in the load range 10 kN (bending tensile) and 400 kN (compression).
- The setting times are determined with the Vicat needle device.
- A ToniCAL heat flow differential calorimeter is available to assess the setting behaviour of hydraulic binding materials.
- Laboratory mortar mixer with vibrating table
- Determination of the space resistance according to 'Le Chatelier'
Standard testing of aggregates
Determination of the building moisture
The following laboratory facilities and technical equipment are available for determining building moisture:
- CM device for determining residual moisture
With the CM device, moisture measurements can be carried out on concretes, screeds, brick materials and aggregates directly on site without additional aids.
- Moisture determination of building materials in the laboratory
Drying cabinets in various sizes are available for testing any material samples.
CO2-incubator
The carbon dioxide incubator enables the artificial carbonation of concrete. This simulates the ageing process of the concrete and allows the carbonation depth to be determined at different carbon dioxide loads on different types of concrete on 150 mm standard test specimens.
Light Incubator
The light incubator simulates long-term exposure of building materials to UV light under changing temperature influences. The device is particularly suitable for testing plastics and lacquers for their UV resistance in the temperature range from 8 °C to 55 °C.
Wear test
Concrete strength test
The concrete strength on the finished structure can be determined non-destructively using test hammers. In the test, the rebound height is measured, which depends on the strength of the mortar near the surface. Since the strength of the mortar generally determines the hardness of the concrete, the bounce hardness can be used to infer the strength of the concrete.
practical course
Contact
Building materials science
Prof. Dr.-Ing. Ulrike Ahlers
Phone: (0391) 886 42 38
Fax: (0391) 886 42 13
E-Mail: ulrike.ahlers@h2.de
Office: Building 16, Room 0.16
Head of "Concrete Testing Laboratory W", Head of "VMPA Recognised Concrete Testing Laboratory".
Heiko Kirsch
Phone: (0391) 886 46 56
Fax: (0391) 886 42 13
E-Mail: heiko.kirsch@h2.de
Office: Building 16, Room 0.07
