Quality – our ongoing promise

Quality is at the centre of Stevin Rock, and key to our continued success and growth. We take great pride in delivering world-leading products and service to our customers through the very best employees and management.

ISO 9001 certification, as well as adherence to many other internationally-recognised standards, confirms we deliver the quality we promise. Our quality assurance system utilises the most up-to-date techniques – including computer aided quarry design, geophysical drilling & testing and sophisticated bench surveying & blast design – and covers every phase of operations, from investigation and sampling to physical and chemical analysis.

Our three internal laboratories conduct an average of 8,500 tests per month on our processes and products, including:

  • Mechanical properties
  • Grading
  • Flakiness and Elongation Index
  • Density & Water Absorption
  • Clay Lumps & Friable Particles
  • Sand Equivalent Value
  • XRF
  • Wet Chemical Analysis
  • Methylene Blue
  • Cation Exchange Capacity

For Armour Rock, we also conduct regular heavy grading and drop tests.
Our quality control procedures are industry leading and include advanced analysis such as X-ray fluorescence spectrometry.
We regularly carry out tests on random samples at all stages of production: from bore holes, drill cuts and belts, to stock and barge.

Base material of the highest quality:

The limestone quarry of Khor Khuwair features Shuaiba formations, characterised by rock that is grey in colour and uniform in appearance, with very low porosity and without any empty cracks. The unconfined compressive strength of the rock is more than 100N/mm2.

Stevin Rock Limestone has been found over the last 35 years to be highly uniform and consistent, with specific gravity varying between 2.69 and 2.71; water absorption less than 0.5%; and Magnesium Sulphate Soundness of less than 1.0%. The rock has a hardness value of between 5 and 6 on Moh’s scale.

Petrographical examination of rock from Khor Khuwair confirms that:

  •  The rock is uniform and consistent with low porosity and can be expected to produces an aggregate with very low water absorption (<0.5%).
  •  The low water absorption contribute to low water demand in concrete with aggregate made from this rock.
  •  The broken surfaces of the rock are mostly rough and can be expected to allow for an excellent bond with cement paste in concrete
  •  The rock is of low reactivity with respect to alkali-aggregate reaction in concrete (innocuous).
  •  The rock has high resistance to impact breakage and crushing