Concrete constituents

VDZ Analyses of concrete constituents

As a modern 5-component system, concrete usually consists of cement, water, aggregate, additives and admixtures. Depending on the application, additional fibers or pigments may be added. Our services around the various concrete constituents and their performance in concrete can be found below.

Testing cement

ServiceMethod
Chemical and physical analysis on cement and mortarEN 196
Hydration based parameters for the prediction of concrete durabilityVDZ method
Extraction of pore solution and chemical analysis
C-value determination of cementDAfStb series no. 422
Consistence fresh mortar (Flow table / Hägermann-table)EN 1015-3

General properties of aggregates

ServiceMethod
Sampling    DIN EN 932‑1
Reducing laboratory samplesDIN EN 932-2
Procedure and terminology for simplified petrographic descriptionDIN EN 932-3

Geometrical properties of aggregates

ServiceMethod
Particle size distribution - Sieving methodDIN EN 933-1
Particle shape - Flakiness indexDIN EN 933-3
Particle shape - Shape indexDIN EN 933-4
Percentage of crushed and broken surfaces in coarse aggregate particlesDIN EN 933-5
Surface characteristics - Flow coefficient of aggregatesDIN EN 933-6
Shell content - percentage of shells in coarse aggregates

Assessment of fines:

- Sand equivalent test
- Methylene blue test
- Grading of filler aggregates (air jet sieving)

 

DIN EN 933-8
DIN EN 933-9
DIN EN 933-10

Classification test for the constituents of coarse recycled aggregateDIN EN 933‑11

Mechanical and physical properties of aggregates

ServiceMethod
Resistance to wear (micro-Deval)DIN EN 1097-1
Resistance to fragmentationDIN EN 1097-2
Loose bulk density and voidsDIN EN 1097-3
Voids of dry compacted fillerDIN EN 1097-4
Water content by drying in a ventilated ovenDIN EN 1097-5
Particle density and water absorptionDIN EN 1097-6
Particle density of filler - Pyknometer methodDIN EN 1097-7
Polished stone valueDIN EN 1097-8
Water suction heightDIN EN 1097‑10
Wehner-Schulze (WS) test method
Thaulow method- Bulk density of aggregates with dense structure

Thermal and weathering properties of aggregates

ServiceMethod
Resistance to freezing and thawingDIN EN 1367‑1
Magnesium sulfate testDIN EN 1367-2
Boiling test for "Sonnenbrand basalt"DIN EN 1367-3
Resistance to thermal shockDIN EN 1367-5
Resistance to freezing and thawing in the presence of salt (NaCl)DIN EN 1367- 6

Chemical properties of aggregates

ServiceMethod
Water-soluble chloride salts using the Volhard method (Reference method)DIN EN 1744-1, Section 7
Water-soluble sulfatesDIN EN 1744-1, Section 10
Total sulfur contentDIN EN 1744-1, Section 11
Acid soluble sulfatesDIN EN 1744-1, Section 12
Acid soluble sulfide contentDIN EN 1744-1, Section 13
Potential presence of humusDIN EN 1744‑1, Section 15.1
Water solubilityDIN EN 1744-1, Section 16
Loss on ignitionDIN EN 1744-1, Section 17
Preparation of eluates by leaching of aggregatesDIN EN 1744-3
Acid soluble chloride saltsDIN EN 1744-5
Influence of recycled aggregate extract on the initial setting time of cementDIN EN 1744-6
Further tests on request

Alkali sensitivity (alkali-silica reactivity) of aggregates

ServiceMethod
Petrographic analysisAlkali Guidelines
Amount of opal sandstone including siliceous chalkAlkali Guidelines
Flint bulk densityAlkali Guidelines
Amount of reactive flintAlkali Guidelines
Accelerated mortar bar test at 80°C (reference method)Alkali Guidelines or RILEM AAR-2
Accelerated mortar bar test at 70°C (alternative method)Alkali Guidelines
Concrete test with fog chamber storage at 40 °CAlkali Guidelines
Concrete prism test at 60 °CAlkali Guidelines or RILEM AAR-4.1
WS basic testing of coarse aggregatesaccording to the General Circular on Road Construction (ARS) No. 04/2013, method V2

Testing of concrete compositions (ASR performance test)

ServiceMethod
60 °C concrete test without external alkali supplyAFNOR P 18-454
60 °C concrete test with external alkali supplyVDZ method
60 °C concrete test on two
drilled core halves (with or
without alkali supply)
VDZ method
40 °C fog chamber storage of drilled coresVDZ method
Analysis of damage resulting from a harmful alkali-silica
reaction
Reflected light micros-
copy, transmitted
light microscopy, and
scanning electron
microscopy

Expert reports for the suitability of aggregates and concrete compositions

ServiceMethod
Preparation of expert reportsIn accordance with
the general circular
for road construction
No. 04/2013 and for
aviation areas

Testing concrete additions

ServiceMethod
Testing fly ashEN 450-1
Testing silica fumeEN 13263-1
Testing blastfurnace slag mealEN 15167-1

Testing concrete admixtures

ServiceMethod
Electro-chemical test for corrosion susceptibilityDIN EN 480-14
Suitability tests of concrete admixturesDIN EN 934
Suitability tests of grout for prestressing tendonsDIN EN 445
DIN EN 447

Testing steel fibres

ServiceMethod
Tensile strength of steel fibresEN ISO 6892-1
Bending tensile strength of steel fibre concrete beams for the determination of performance classesDAfStb-Guideline "Steel fibre concrete"
Bending tensile strength of steel fibre concrete beamsEN 14651
Consistence vebe testEN 12350-3

Testing pigments

ServiceMethod
Testing pigmentsEN 12878

Testing mixing water for concrete

ServiceMethod
Testing mixing waterEN 1008

Contact

Dr. Christoph Müller

Dr. Christoph Müller

Phone:
+49-211-45 78-351

Fax:
+49-211-45 78-296

Service offer

Concrete and mortar: testing of fresh and hardened concrete – tests regarding alkali-silica reaction – testing aggregates and admixtures

Quality standards

The VDZ gGmbH is accredited by the Germany's National Accreditation Body according to DIN EN ISO/IEC 17025.