The Geolabs are equipped for various geographical sciences services. The field equipment services complement the services offered by the laboratories. Also, some instruments housed in the Geolabs can be used for field work. The laboratories serve undergraduate teaching and provide research facilities for MPhil, DPhil students and post-doctoral researchers.
- Physical and Textural Analysis
- Environmental Chemical Analysis
- Microscopy and Imaging
- Environmental Cabinets
- Moisture Analysis
- Samples' Environmental Monitoring
- Samples Preparation Instruments
Physical and Textural Analysis
In the Geolabs, physical and textural analyses are mainly performed on stone, mortar or soil samples.
- Mechanical properties like strength are an important component of many geomorphological or stone heritage conservation studies. We can determine mechanical parameters with direct methods which will result in sample destruction and with indirect methods using non-destructive technique.
- With our Matest Unitronic Load Frame 50kN Tester , compressive, flexural and tensile measurements of cement, soil, limestone, mortar materials can be performed with automatic load displacement /deformation control. This machine is only for low strength materials (less than 50kN).
- Grindosonic MK5 'Industrial' , is used for measurements of Dynamic Young's Modulus of rocks and mortars, which is a strength parameter of the material. This non-destructive test apparatus measures the fundamental vibration frequency of the material using the elasticity theory.
- We have several Rebound Schmidt Hammers .
This 50 years old Proceq invention instrument has become the most widely used instrument for non-destructive estimation of concrete, asphalt, mortar and rocks strength and hardness properties.
- Like the Silver Schmidt Hammer, Proceq Equotip 3 and
Proceq Equotip Piccolo Bambino 2instruments enable to measure hardness using rebound values. Using the Leeb test principle, this device measures the hardness with a much lower impact compared to the Schmidt hammer.
- We use another ultrasonic technology, the pulse velocity technique of the Proceq PunditLab
to obtain information of the strength and uniformity of rocks and conservation mortars.
Environmental Chemical Analysis
Environmental chemical analyses are performed in the Geolabs using the following instruments and techniques:
- Ion Chromatography with a Dionex IC DX500 Chromatograph
, this technique analyses water mineral composition, nutrients in soils and soluble minerals in stone building materials. Three different columns allow us to determine Chloride, Nitrate, Nitrite, Sulfate, Bromide, Fluoride and Phosphate, Potassium, Sodium, Calcium, Magnesium, ferrous and ferric Iron and other transition metals.
- Varian SpectrAA 220 FS Atomic Absorption spectrophotometry :
this is an analytical technique for determining the concentration of particular metal elements within a sample. In the Geolabs, it is often used for water, soil, rock or leaf water extracts to determine the alkali, earth-alkali metals as well as heavy metals.
- With the DR 3900 Hach spectrophotometer ,
more than 50 of the most important water quality parameters can be measured. For example, we analyse in waters total organic carbon (TOC), Phosphate, metals like Aluminium, etc.
- Using the same spectrophotometric technique, with the BioTek Epoch Microplate Reader ,
we can quantify a wide range of biological and chemical parameters in plants, soils, sediments or rocks as well as waters.
- pH, Electrical conductivity (EC), Oxidation Reduction Potential (ORP), total dissolved solid (TDS), Dissolved Oxygen (DO) are analysed in waters or aqueous media using various Hanna Instruments meters and high sensitivity electrodes.
Microscopy and Imaging
The Geolabs are equipped with various microscopy and imaging instruments.
- Several polarizing microscopes MEIJI ML900 for rocks mineralogical analysis.
- 2 Leica stereomicroscopes, the MZ10F
equipped with fluorescence and the S8 APOare used for observations and analysis of any material sample in situ. The fluorescence feature allows us to observe specific cell organelle or protein. For example, we can estimate the amount of a micro-organism growing on rocks.
- A brightfield upright Olympus BX43 microscope
with LED light source equipped with Olympus SC50 camera is used for anatomical analysis of plant tissues as well as stone structures. The high definition quality of the images obtained from this microscope give its user higher image analysis options.
- Different microscope cameras are interchangeably attached to the microscopes and used with tablets and/or different softwares for image analysis.
- A scanning electron microscope Cambridge S90B
is used to observe and analyse soils and sediments. This microscope is mainly used for criminal and environmental soil forensic analyses.
The Geolabs house three Environmental cabinets. They are heavily used for a variation of applications. Primarily used for environmental cycle simulations of rock breakdown, landscape evolution, weathering of historical monuments and the effects of bio-soiling on rocks' weathering, they are also used to keep brick and mortar samples in controlled temperature and humidity conditions.
- Sanyo-FE 300H/MP/R20
- Binder KBF115
Moisture is an important parameter to examine and analyse in the Geolabs research projects. We use different instruments to give a scientific estimation of the water contents in various stone or mortar building materials. Moisture meter instruments are also used for field work. The Geolabs possess various moisture meters using different electric parameters.
- Electric Resistivity meters Protimeter and Resipod
- Dielectric Constant Capacitance meters FMW, CEM, T660 and Protimeter
- Dielectric microwave meters Moist 350B, T610
- Electric Resistivity Tomography (ERT) - GeoTom
Samples' Environmental Monitoring
The Geolabs users have at their disposal various data loggers to monitor physical values like temperature, humidity and energy. We use Tiny Tag data loggers for specific wall and soil applications which give us more probe and sensor options and we widely use ibuttons for all other general applications. Ibuttons are very small. Watch battery like device, they are very discreet and ideal in traffic areas.
Samples Preparation Instruments
- Thin sections preparation laboratory: Rock and Soil thin sections can be done in earth science where the Geolabs technical staffs have access to the facilities.
- Microwave to digest soil, rocks and plants: Mars 6 CEM
- Rock cutting saws:
- Masonry Saw-Clipper CM 501 Major
- Tile Saw-Jolly Max
- Rock saw - Delta Buehler
- Masonry Saw-Clipper CM 501 Major