ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural & Tensile Splitting

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ISO 1920-4 Hardened Concrete Strength Tester | Compressive, Flexural & Splitting Tensile Test | UnitedTest

ISO 1920-4 specifies standardized test methods for hardened concrete strength, covering compressive strength, flexural strength, and tensile splitting strength testing. UnitedTest manufactures fully ISO 1920-4 compliant concrete strength testing machines for construction material quality control and laboratory certification.

ISO 1920-4 is the core international standard for testing hardened concrete mechanical performance, serving as the updated replacement for the outdated ISO 4012 standard. This comprehensive standard consolidates three essential strength testing procedures for hardened concrete materials, including compressive strength testing, flexural strength testing, and tensile splitting strength testing, covering all mainstream mechanical performance verification requirements for construction concrete.

The standard fully defines complete and standardized testing specifications, including qualified concrete test specimen requirements, professional testing apparatus parameters, standardized operating procedures, accurate strength calculation formulas, specimen failure assessment criteria, test precision calibration data, and formal test report compilation requirements. It provides unified, authoritative testing guidelines for concrete manufacturers, construction engineering teams, and third-party material testing laboratories worldwide.

Widely applied in civil engineering, building construction, road and bridge engineering, ISO 1920-4 test results are critical for concrete batch quality inspection, structural performance evaluation, construction project acceptance, and concrete material formulation optimization. UnitedTest designs and manufactures high-precision ISO 1920-4 integrated concrete strength testing machines. Our multi-functional test equipment supports accurate testing of concrete compressive, flexural, and splitting tensile strength, delivering stable, repeatable test data to meet industrial production and laboratory testing standards.

ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural

The test principle and Specific test methods:

Method	Measured property	Test Principle	Primary application
Compressive strength	f_c (MPa): Measure maximum uniaxial compressive resistance of cube, cylinder or drilled core specimens.	A cube, cylinder or core is loaded in uniaxial compression between hardened machine platens at a constant stress rate until it can sustain no greater load. Strength = maximum load ÷ loaded cross-sectional area.	Universal acceptance criterion, structural design basis
Flexural strength (two-point / third-point loading)	f_f (MPa): Two‑point‑loading bending test to obtain concrete flexural‑tensile strength using prism specimens.	A prism rests on two supporting (lower) rollers and is loaded through two upper rollers, producing a constant bending moment over the middle third of the span (pure-bending zone). Failure occurs in tension at the bottom fibre.	Pavements, airport apron, industrial slabs, tunnel segments
Tensile splitting strength (Brazilian / indirect tensile test)	f_ts (MPa): Indirect tension test applying compressive line‑load to produce transverse tensile stress for calculating splitting tensile strength on cube/cylinder/prism samples.	A compressive line load is applied along two diametrically opposite generators of a cube, cylinder or prism through hardboard packing strips. This generates a near-uniform transverse tensile stress on the loading plane; the specimen splits because the material is far weaker in tension than in compression.	Cracking resistance, shear-friction, durability-related design

Method

Measured property

Test Principle

Primary application

Compressive strength

f_c (MPa):

Measure maximum uniaxial compressive resistance of cube, cylinder or drilled core specimens.

A cube, cylinder or core is loaded in uniaxial compression between hardened machine platens at a constant stress rate until it can sustain no greater load. Strength = maximum load ÷ loaded cross-sectional area.

ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural

Universal acceptance criterion, structural design basis

Flexural strength

(two-point / third-point loading)

f_f (MPa):

Two‑point‑loading bending test to obtain concrete flexural‑tensile strength using prism specimens.

A prism rests on two supporting (lower) rollers and is loaded through two upper rollers, producing a constant bending moment over the middle third of the span (pure-bending zone). Failure occurs in tension at the bottom fibre.

ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural

Pavements, airport apron, industrial slabs, tunnel segments

Tensile splitting strength

(Brazilian / indirect tensile test)

f_ts (MPa):

Indirect tension test applying compressive line‑load to produce transverse tensile stress for calculating splitting tensile strength on cube/cylinder/prism samples.

A compressive line load is applied along two diametrically opposite generators of a cube, cylinder or prism through hardboard packing strips. This generates a near-uniform transverse tensile stress on the loading plane; the specimen splits because the material is far weaker in tension than in compression.

ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural

Cracking resistance, shear-friction, durability-related design

Test Specimen Information:

Compressive‑strength specimens: Cubes / cylinders (manufactured according to ISO 1920‑3) or drilled concrete cores (ISO 1920‑6). If dimensional deviations exceed tolerance, actual measured dimensions shall be used for strength calculation.
Flexural‑strength specimens: Square‑cross‑section prisms (nominal 100 mm or 150 mm). Specimen width‑to‑maximum‑aggregate‑size ratio ≥ 4. Casting direction must be clearly marked on prisms.
Tensile‑splitting specimens: Cubes, cylinders or prisms complying with ISO 1920‑3. Damaged/honeycombed samples are disqualified for testing. Mark loading plane on specimens before testing.

Minimum specimen quantity: At least three replicate specimens (preferably from different batches) for each test age for all three strength determinations.

Test Equipment associated with ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural & Tensile Splitting

Compression Testing Machine	Robust, capacity matched to specimen size, capable of the specified rate; calibrated at least once per year and in calibration at time of test; accuracy ≤ ±1.0 % of the indicated load over the working range. Machine / auxiliary platens: Minimum hardness 550 HV; auxiliary platen thickness ≥ 23 mm; contact‑surface roughness Ra 0.4–3.2 μm. Control system — manual or automatic. If force application is not automatic, a pacer must be fitted, indicating rate within ±5.0 % of the specified rate.



Method‑specific accessories	Compressive test: Grinding/capping consumables (grinding tools, sulphur mixture, aluminate cement mortar, sandbox, elastomeric unbonded pads described in Annex B for end‑surface adjustment of specimens). Flexural strength test: Two‑point loading roller assembly: steel rollers diameter 20–40 mm; outer‑roller span L_rol=3l, inner‑roller spacing = specimen width l. Tensile‑splitting test: Curved steel loading pieces, positioning jig, single‑use hardboard packing strips (10 mm ±1 mm width, 4 mm ±1 mm thickness, density > 900 kg/m³) conforming to EN 316.

Key Test Parameters

Parameter	Compression	Flexural	Tensile splitting
Constant stress rate	0.6 ± 0.2 MPa/s	0.04 – 0.06 MPa/s	0.04 – 0.06 MPa/s
Rate tolerance after initial load	±10 %	±1 %	±1 %
Initial (seating) load	≤ ~30 % of failure load	≤ ~20 % of failure load	—
Load application	Continuous, without shock, until no greater load can be sustained	Same	Same
Centring / alignment	Centred on lower platen to 1 % of designated size; cubes loaded perpendicular to casting direction	Longitudinal axis at right angles to rollers; loading direction perpendicular to casting direction	Strips along marked loading plane; upper platen parallel to lower platen
Result rounding	0.1 MPa	0.1 MPa	0.05 MPa
Failure assessment	Satisfactory/unsatisfactory vs. Figures 1–4; if unsatisfactory, record nearest pattern	Fracture outside the loading rollers = unsatisfactory	Record appearance; non-vertical fracture plane = unusual
Extra report items	Specimen type (cube/cylinder/core), adjustment method, failure type	Loading method: two-point / centre-point	Description of loading pieces

Test Procedure of ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural & Tensile Splitting

1, Compression

Centre the specimen (1 % accuracy); align the top auxiliary platen with the top of the specimen; on two-column machines place the trowelled face towards a column.

Apply load without shock; apply initial load ≤ ~30 % of failure load; then increase continuously at the selected constant rate (±10 %) to failure. On manual machines, correct any rate fall-off near failure; on automatic machines, verify the rate periodically.

Record maximum load; assess and record the failure pattern.

2, Flexural

Place the specimen centred, axis at right angles to the rollers; loading direction perpendicular to the casting direction (result is sensitive to this).

Confirm all four rollers seat evenly before loading.

Load without shock; initial load ≤ ~20 % of failure load; then 0.04–0.06 MPa/s (±1 %) to failure.

Record maximum load; examine and record the fracture type.

3, Tensile splitting

Mark the casting direction; mark two opposite loading lines in one axial plane (for cubes/prisms, mark on moulded faces so the fracture plane crosses the trowelled / as-cast top face) and join the line ends over each end face.

Position the specimen centrally, optionally in a jig, with packing strips and loading pieces along the marked plane.

Keep the specimen centred as load is first applied; load without shock at 0.04–0.06 MPa/s (±1 %).

Record maximum load; examine the fracture.

Related standard

EN 12390	Testing hardened concrete-Compressive strength of test specimens
ASTM C39 / C39M	Standard Test Method for Compressive Strength of Cylindrical Concrete Specimens
AS 1012.9	Methods of testing concrete, Method 9: Compressive strength tests - Concrete, mortar and grout specimens
ASTM C513	Standard Test Method for Obtaining and Testing Specimens of Hardened Lightweight Insulating Concrete for Compressive Strength
UNE-EN 12390-6	Testing hardened concrete - Part 6: Tensile splitting strength of test specimens
ISO 4012	Concrete — Determination of compressive strength of test specimens
ISO 4013	flexural strength test of concrete specimens;
ISO 4108	splitting tensile strength test;
ISO 1920‑4	Testing of concrete — Part 4: Strength of hardened concrete
ISO 1920‑5	Hardened‑concrete non‑strength properties (density, water penetration)
ISO 1920‑7	Non-destructive tests on hardened concrete
KS F 2405	Method of test for compressive strength of concrete
JIS A 1108	Method of test for compressive strength of concrete
JIS A 1113	Method of test for splitting tensile strength of concrete
IS 516	Methods of Tests for Strength of Concrete
ACI 363.2R-11	Guide to Quality Control and Assurance of High-Strength Concrete

Industry Application:

ISO 1920‑4 applies across civil‑engineering and construction industries globally:

- Concrete‑batching‑plant quality‑control laboratories for production acceptance testing of ready‑mix concrete.

- Construction‑site laboratory testing for cast‑in‑situ concrete quality verification.

- Material‑research laboratories for concrete‑formulation development, additive‑modified‑concrete performance study.

- Third‑party‑accredited testing institutes for conformity assessment of concrete products.

- Forensic‑engineering investigation: testing drilled core samples (ISO 1920‑6) obtained from existing structures to evaluate in‑place hardened‑concrete mechanical performance.

Results support structural‑design checking, construction‑quality acceptance, service‑life evaluation of buildings, bridges, dams, tunnels and other concrete infrastructure.

Keywords: ISO 1920-4 concrete strength tester,hardened concrete compressive flexural tensile test machine,concrete tensile splitting strength test rig,multi-function concrete strength testing equipment,construction concrete mechanical performance analyzer,concrete specimen strength verification apparatus,civil engineering concrete quality control tester,building concrete batch inspection system,road bridge concrete performance test machine,hardened concrete failure assessment equipment,concrete laboratory certification test instrument,ISO 1920-4 compliant concrete test machine,concrete strength calculation and precision testing rig

UnitedTest Hydraulic Compression Strength Testing Machine to test cement, brick and concrete is offered by United Test. Use hydraulic power driving, intelligent measuring and control meter to collect and process data, consist of frame, oil source, control system, test fixture. Accuracy class 1, max. test load 2000KN, 3000KN.

YES series Compressive Strength Testing Equipment to test cement, brick and concrete is offered by United Test. Range 1000KN, 2000KN, and 3000KN, these strength testing equipment are extremely handy and are easy to use for testing cement, concrete and mortar cubes.

Compression and Flexural Integrated Testing Machine used for both flexural strength tests of concrete specimens and compressive strength tests of building materials such as cement, mortar, and red bricks. It can also perform compressive and flexural strength tests of cement mortar.

Q1: What is ISO 1920‑4:2020 and why is this test important for concrete material?

A: ISO 1920‑4:2020 is the global ISO standard for measuring compressive strength, flexural strength and tensile‑splitting strength of hardened concrete. Concrete strength is the core design and acceptance parameter for buildings, bridges, dams and infrastructure. This standard unifies specimen preparation, loading rate, calculation rules and reporting requirements. Standard‑compliant tests deliver repeatable, comparable lab results across different labs and countries, avoiding unsafe structural design or wrong quality judgements for concrete projects.

Q2: What are the allowed loading‑rate ranges in ISO 1920‑4 testing?

Compressive strength: constant stress rate 0.6 MPa/s ±0.2 MPa/s;
Flexural strength: stress rate 0.04 ~ 0.06 MPa/s;
Tensile‑splitting strength: stress rate 0.04 ~ 0.06 MPa/s. Manual‑control machines need a pacer to keep loading rate within tolerance; automatic machines need regular rate verification.

Q3: Can I test honeycombed or visibly cracked concrete specimens according to ISO 1920‑4?

A: Badly honeycombed / cracked specimens are not representative and should normally be rejected. If you still perform testing on defective specimens, you must explicitly record the honeycomb/crack defect inside your formal test report.

Q4: Can one single universal testing machine complete all three ISO 1920‑4 strength tests?

A: Yes. A high‑capacity compression‑testing machine with change‑over accessories (flexural two‑point‑loading roller assembly, splitting‑tensile jig and hardboard packing strips) can run compressive, flexural and splitting‑tensile tests. Machine must satisfy ISO 1920‑4 accuracy, platen‑hardness (≥550 HV) and loading‑rate requirements for each test mode.

Q5. Why does the standard specify platen hardness (≥ 550 HV) and auxiliary platen thickness (≥ 23 mm)?

A: Because a soft or thin platen deforms and wears under repeated high-load testing, creating non-uniform contact stresses at the specimen faces. That changes the failure pattern and biases the measured strength. The ≥ 550 HV Vickers hardness and ≥ 23 mm thickness requirements keep the load transfer genuinely planar over the machine's service life; the contact-face roughness must also stay within Ra 0.4 µm to 3.2 µm.

Q6. What are the equivalent standards in other systems?

A: ISO 1920-4:2005 itself replaced and consolidated ISO 4012:1978, ISO 4013:1978 and ISO 4108:1980, which are all withdrawn.

Property	ISO	EN (Europe)	ASTM (USA)	China
Compressive	ISO 1920-4 Cl. 4	EN 12390-3	ASTM C39/C39M	GB/T 50081-2019
Flexural	ISO 1920-4 Cl. 5	EN 12390-5	ASTM C78/C78M (third-point), C293/C293M (centre-point)	GB/T 50081-2019
Tensile splitting	ISO 1920-4 Cl. 6	EN 12390-6	ASTM C496/C496M	GB/T 50081-2019
Making & curing	ISO 1920-3	EN 12390-2	ASTM C31/C31M	GB/T 50081-2019
Cores	ISO 1920-6	EN 12504-1	ASTM C42/C42M	—
Capping	ISO 1920-4 Annex B	—	ASTM C617	—

ISO 1920-4:2005 itself replaced and consolidated ISO 4012:1978, ISO 4013:1978 and ISO 4108:1980, which are all withdrawn.

Q7. What are the main practical differences from ASTM practice?

A: ISO 1920-4 admits cubes, cylinders and cores on equal footing whereas ASTM C39 is cylinder-oriented (typically Ø150 × 300 mm);

the ISO compression rate (0.6 ± 0.2 MPa/s) is roughly 2.4× the ASTM C39 rate (~0.25 ± 0.05 MPa/s);

ISO flexural uses a span of 3l with Ø20–40 mm rollers, while ASTM C78/C293 use third-point or centre-point loading with their own rate bands.

For a laboratory serving international projects, the practical answer is a machine whose controller can be configured to each standard's rate band rather than a single fixed-rate machine.

Q8: Why choose ISO 1920-4 Compliant Concrete Compression, Flexural & Splitting Tensile Testing Machines from UnitedTest?

A: UnitedTest concrete testing machines are engineered for ISO 1920-4:2020 — compressive, flexural (two-point) and tensile splitting strength of hardened concrete. Every frame delivers ±1.0 % load accuracy, annual calibration traceability, closed-loop constant-stress control at 0.6 ± 0.2 MPa/s and 0.04–0.06 MPa/s, and platens of ≥ 550 HV / ≥ 23 mm. Matched fixtures cover 100–150 mm cubes, Ø150 × 300 mm cylinders, prisms and ISO 1920-6 cores. One machine, three methods, Clause 7-compliant reporting.

UnitedTest designs and manufactures complete concrete strength‑testing equipment fully aligned with **ISO 1920‑4:2020 Testing of concrete‑Part 4: Strength of hardened concrete**, the key international standard for measuring compressive strength, flexural strength and tensile‑splitting strength of hardened concrete specimens.

Our servo‑hydraulic concrete compression testing machines satisfy ISO 1920‑4 strict requirements: ±1 % load‑measurement accuracy, stable adjustable stress‑rate control, platens with ≥550 HV Vickers hardness, auxiliary‑platen thickness and surface‑roughness compliance. With optional interchangeable accessories including two‑point flexural‑loading roller assembly, tensile‑splitting‑test jigs and hardboard‑strip holders, one machine can perform all three core strength tests defined in ISO 1920‑4 for concrete cubes, cylinders, prisms and drilled core samples.

Our test‑machine software supports pre‑programmed ISO 1920‑4 loading‑rate parameters, automatic strength calculation per standard formulas, failure‑load recording, fracture‑result tagging and editable test‑report templates matching Annex C report examples. The system helps concrete‑laboratory engineers, ready‑mix‑concrete QC labs, third‑party inspection bodies, university research institutes and precast‑concrete manufacturers achieve fully‑standard‑compliant concrete‑strength testing workflows.

All UnitedTest concrete testers support annual calibration traceability. Our equipment is also compatible with related standards including ISO 1920‑3, ISO 1920‑6 and EN 12390‑series European hardened‑concrete‑testing standards. We provide custom‑configurable load‑capacity, platen dimensions, multi‑language software, local‑market power‑supply adaptation, CE certification, installation guidance and global after‑sales support for laboratories worldwide.

If you are sourcing ISO 1920‑4 concrete compression tester, concrete flexural‑strength‑test setup or tensile‑splitting‑strength‑testing machine for your construction‑material laboratory, contact UnitedTest for technical datasheets and quotation.

We offer customization to meet your specific needs. Our expert team will collaborate with you to develop the perfect product for you

ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural & Tensile Splitting

ISO 1920-4 Hardened Concrete Strength Test - Compressive, Flexural & Tensile Splitting