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Building Materials

In today’s competitive and regulation-controlled marketplace, it is imperative for both manufacturers and service providers to work in compliance with the various relevant national and international standards and regulations. Spectro Research Lab Ventures (P) Ltd. is one of the top service providers in the field of physical and chemical testing of building materials. Our services not only include testing activities, but also encompass structural inspections, Non-destructive (NDT) inspections, and engineering consultations.

At Spectro, analyses activities range from determination of physical properties, like durability, strength, load, resistance, and chemical properties like compositional analyses, and also micro-structural properties. Spectro’s strength lies in its team of qualified, trained, and experienced analysts, who are not only aware of their technical responsibilities but also, do their bit in solving the client’s queries, if any. Besides, Spectro also possesses the latest and ultra-modern instruments which, not only provide fast sample analysis, but also, more importantly provide accurate and reproducible test results. Spectro’s accreditations from NABL for its testing activities bear its credentials and uphold its integrity as a leading testing laboratory in India.

Our major clients include DMRC, Airport Authority of India, DDA, EIL, NTPC, NHPC, JP Group, Gammon India, etc.

The Rapid Chloride Permeability Test conducted at Spectro

This test is aimed at nondestructive measurement of Chloride permeability of in-place concrete. This test measures the electrical conductance of the concrete, which can be correlated to concrete permeability. A concrete with a high permeability will allow a high amount of current to pass through it, and hence have a high Coulomb value and vice versa.

The Rapid Chloride Permeability test gives a measure of the “permeability‿ or “penetration‿ of concrete to chloride ions, the presence of which badly affects the compressive strength of concrete. Many highway agencies have adopted this test and it was also included in High performance bridge specifications. Spectro conducts ‘The Rapid Chloride-ion Permeability Test‿(RCPT) in accordance with ASTM C1202. The advantage of this test over other conventional Permeability tests is that it is extremely simple to conduct and can be performed in a shorter period of time.

Ingression of Chloride ions into reinforced steel is one of the most common environmental damages that result in the damage and deterioration of concrete structures. The penetration of chloride ions into crack-free concrete may occur via different mechanisms, viz. capillary absorption, hydrostatic pressure, diffusion, and evaporative transport. Out of all these, ‘Diffusion‿is the predominant one. Diffusion occurs when there is a concentration gradient of chloride ions across the separation between the inside and the outside environment. This initiates the movement of chloride ions moving through the concrete to the level of the rebar. The occurrence of this in combination with the natural wetting and drying cycles of the environment, and the presence of oxygen create conditions ideal for corrosion of reinforcement steel/concrete.

Chloride Permeability Based on Charge Passed

Charge Passed (in Coulombs) Chloride Permeability Typical of
> 4,000 High High (Water/Cement) ratio (> 0.60); Conventional PCC
2,000 ‿4,000 Moderate Moderate (Water/Cement) ratio (0.40 ‿0.50); Conventional PCC
1,000 ‿2,000 Low Low (Water/Cement) ratio (< 0.40) Conventional PCC
100 ‿1,000 Very Low Latex modified concrete or internally sealed concrete
< 100 Negligible Polymer impregnated concrete; Polymer concrete

N.B.: PPC stands for Portland Pozzolana Cement

Some of the Materials and Products tested at Spectro

  • Aggregate
  • Masonry
  • Asphalt
  • Concrete
  • Bitumen
  • Bricks
  • Cement
  • Soil
  • Refractories
  • Tiles
  • Wood

Major Equipments used by Spectro

  • Los Angeles Abrasion Machine
  • Aggregate Impact Value Apparatus
  • Blaine Permeability Apparatus
  • Cement Auto Clave
  • Penetrometer
  • Vibration Machine
  • Vicat Apparatus
  • Water Permeability Apparatus
  • CBR Apparatus
  • Compressive Testing Machine
  • Cursing Value Apparatus
  • Surface Abrasion Machine
  • Sedimentation Apparatus
  • Bitumen Extractor
  • Air Content Apparatus
  • Butimen Softing Point Apparatus
  • Ductility Meter
  • Digital Gloss Meter
  • Angle Protector
  • Le Chatelier Flask
  • Liquid Limit Tester
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