Petrography Lab Services
Concrete petrography plays a critical role in durability assessments of existing structures.
Our experienced petrographers can determine the constituents of the cement paste, classify the aggregate/sand type, map crack/ microcrack patterns, identify secondary deposits and much more. Through this process we can determine which deterioration mechanisms have occurred, are occurring or are likely to initiate. These include but are not limited to:
- Alkali-Silica Reaction
- Delayed Ettringite Formation
- Sulphate Attack
- Acid Attack
- Soft Water Attack
When matching historic mortars and renders, knowing the composition of the original materials is paramount to creating an ideal match.
Our petrographic team can determine the aggregate mineralogy and cement constituents of the sample, as well as the air content of the mortar. From the petrographic and wet chemistry data, the percentage of portland cement, hydrated lime and sand in the existing mortar is calculated aiding in the mix design for remedial mortars and renders.
Understanding the potential for particular aggregates to undergo alkali-silica reaction (ASR) or have undesirable constituents is crucial when determining suitability for use.
Aggregate petrography is used to analyse both coarse and fine aggregate to classify the rock/mineral types present and identify these deleterious constituents. The results of the analysis breakdown the weighted percentages of the rock and existing minerals in the sample, and these percentages can be compared to specifications to determine if the sample is suitable for use.
Building material without standard test methods can still be evaluated by petrography to determine their condition and properties.
Bricks are tested to determine causes of cracking/spalling or degree of firing. Grouts can be looked at to determine their constituents and degree of hydration. Our optical microscopy facilities can also be used for forensic investigations of coatings, metals and ceramics.