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1-In the road field:

  • Density of soil in place by the rubber balloon, sand replacement or nuclear method.
  • Plate bearing tests.
  • In-situ CBR test.
  • Drilling cores of bituminous pavement for thickness measurement, asphalt content and capacity determination.
  • Roughness surface measurement of pavement (texture depth) by san patch test.
  • Visual observations and statement of surface deterioration by means of 3 meters ruller and 1m3 frame.
  • Deflexion measurements under loaded truck axle with Benkelman beam.
  • Evenness measurement of pavements by bump integrator unit.

2-Soil investigation

  • Trial pits and hand auger investigations at shallow depths in soft soils allowing visual examination of soils and taking undisturbed or disturbed samples for laboratory analysis.
  • Deep borehole (35m depth max) with APAFOR drilling machine equiped with differents tools allowing all tests able to be performed by such a machine: auger drilling, core drilling, SPT tests, undisturbed samples taken by SPT, APM or MAZIER (triple envelope) core barrel witch allows sampling all kings of soils for mecanical testing in the laboratory.
  • Heavy dynamical cone penetration tests (amvil of 63kg drop fall of 50 or 75cm) allowing assessment, by a simple and fast test, the refusal depth and the bearing capacity of soils.
  • Light dynamical cone penetration tests (amvil of 10kg).
  • Pressiometer tests (elastmeter) Menard: performed in borehole carried on by a drilling machine or hand auger (the most satisfactory method for foundation investigations).
  • Vane tests (Geonor type) for soft coherent soils investigations.

3-Construction materials and structures:

  • Quality control of concrete during construction: slump test, casting specimens of concrete on site for later testing in the lab.
  • Measurement of the speed of sound through builing materials such as concrete, maconery, rock and wood, sometime followed by Schmidt hammer test giving concrete strength at shallow depth.
  • Locate steel reinforcement rods in concrete by means of a pachometer (localisation and diameter).
  • Drilling in hardeded concrete to perform test in the lab on old structures.
  • Calibration of crushing machine by means a load cell with electronic tester.

1-Physical and mecanical characteristics of soils:

  • Moisture content.
  • Density by drive cylinder or hydrostatic weighing methods.
  • Specific gravity of soil.
  • Particle size analysis of soils by wet sieving and hydrometer test for elements < 80u.
  • Atterberg limits: liquidity, plasticity and shrinkage, Cassagrande or dropping cone method for liquid limit.
  • Methy1 blue test, sand equivalent, organic matter content.
  • Permeability test and swelling test on soils.
  • Direct shear test on undisturbed sample: UU, CU or CD tests.
  • One dimentional consolidation properties of soils.
  • Unconfined compressive strength on cohesive soils.

2-Geotechnical tests for road:

  • Moisture-density relationship of soils using 4.5kg rammer and 457mm drop or 2.5kg rammer and 3305mm drop.
  • California Bearing Ratio of soils before and after soaking with swelling measurement.
  • Study of efficiency of special products.
  • Aggregate Impact Value and Aggregate Crushing Value tests on laterite gravels.

3-Tests on aggregates (natural stones or crushed rocks):

  • Identification tests same as for soils, cleaness tests.
  • Flat and elongated particles determination.
  • Resistance to abrasion of aggregates by use of the Los Angeles machine.
  • Compression and flexural test on sawed samples; pulse sound velocity test.
  • Porosity and alterability tests.
  • Coating and stripping test on aggregate-bitumen mixture: Vialit, TWIT, Riedel-Weber, LCPC methods.

4-Bitumen (bitumen, emulsion or cut-back) and bituminous mixtures tests:

  • Tests on bitumen: penetration test, ring and ball test, ductility, loss at 1630C.
  • Density of bitumen, cut-back and emulsions, water content and stability of emulsions.
  • Viscosity Redwood of cut-back and Engler on emulsions.
  • Distillation of petroleum product (cut-back) and penetration test on residu.
  • Marshall and Duriez tests on bituminous mixtures, Hubbard-Field on sand-asphalt.
  • Quantitative extraction of bitumen from bituminous mixtures Kumagawa or centrifugation method.

5-Test on cement:

  • Standard tests with or without standard cement, including compressive and tensile strength of standard mortar, determination of setting time, autoclave expansion, density and fineness (Blaine method).
  • Partial chimical analysis (loss of ignition, insoluble, SO3). Sulfate resisting test.

6-Mix design and quality control of concrete:

  • Partial analysis of mixing water.
  • Mix design.
  • Batching, casting and testing cylinders, cubes or beams.
  • Flexural strength on beams or splitting test on cylinders (bresilian test).
  • Analysis of freshly mixed concrete and of hardened concrete by calcination method.
  • Determination of static and dynamical modulus of concrete by pulse sound velocity.
  • Test on inter locking blocks.

7-Tests on micealencous materials:

  • Tests on hollow blocks, bricks: density, porosity, compressive strength, flexural strength, permeability.
  • Steel: yield and tensile stress, dimentionnal measurement.
  • Micealencous tests on sealing products, tiles, epoxy compound.
Background Information
CURRICULUM VITAE I. PERSONAL DATA:   Name : KHUN SRUN                  Sex: Male Nationality : Cambodian Date of Bir...
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IN-SITU TESTS: 1-In the road field: Density of soil in place by the rubber balloon, sand replacement or nuclear method. Plate bearing tests. In-situ CBR test. Drilling cores of bituminous pavement for thickness measurement, asphalt content and capa...
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