ASTM C349 Cement Mortar Compressive Strength Testing | UnitedTest Cement Compression Testing Machine

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Material strength is a course that most engineering fields are required to study in university education. This interesting course is very practical and makes use of testing equipment in the materials laboratory.

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Tensile test evaluates material resistance to stretching, measuring strength/elongation critical for quality control. UnitedTest offers universal tensile testers (10-600KN) compliant with ASTM/ISO standards, providing tailored solutions for metals, polymers, medical & industrial materials.

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ASTM C349 Cement Mortar Compression Tester | Broken Flexure Prism Specimens | UnitedTest

ASTM C349 measures compressive strength of hydraulic-cement mortars using broken segments of 40×40×160 mm prisms tested under ASTM C348 flexure method. UnitedTest manufactures ASTM C349 compliant compression test machines for cement mortar mechanical property analysis.

ASTM C349 is a standard test method used to obtain compressive strength data for hydraulic-cement mortars from broken fragments of 40 × 40 × 160 mm prisms after completing ASTM C348 flexural testing. The compressive results generated by this method serve only for reference purposes and cannot substitute ASTM C109/C109M for official cement acceptance tests. Instead of casting independent cube specimens for compression evaluation, this test reuses the two broken pieces from each mortar prism fractured during the C348 flexure test. These broken prism sections function as modified cube specimens for compressive loading. This testing workflow allows labs to collect both flexural strength and compressive strength data from a single batch of mortar prisms, saving material, mould preparation and specimen curing time.

This method is commonly used in cement research laboratories, material development and comparative performance studies of hydraulic cement mortars. UnitedTest supplies high-precision compression testing machines compatible with ASTM C349 and ASTM C348 standards, supporting combined flexure and compressive strength testing for cement mortar specimens.

The test principle:

A uniaxial compressive load is applied perpendicularly to the 40 mm‑width face of the modified‑cube fragment until failure. Compressive strength is calculated from the maximum failure load and the fixed loaded area of the bearing plates. Strength reflects the uniaxial compression‑resisting capacity of hydraulic‑cement mortar. Since specimens are fractured prism remnants, results serve for research reference rather than official cement compliance judgementASTM Inter....

Calculation formula:

S_c = 0.00062P

Where:

S_c = compressive strength (MPa), rounded to nearest 0.1 MPa;

P = total maximum applied load (N).

ASTM C349 Cement Mortar Compressive Strength Testing

Test Specimen Information:

Source: both halves of every prism broken in flexure per C348 (prism 40 × 40 × 160 mm, prepared and cured under the C348/C109 family of procedures — standard mortar, 1 part cement : 2.75 parts standard sand, water fixed by type or by 110 ± 5 flow).

Dimensions of the tested portion: cross-section 40 × 40 mm; length ≥ 65 mm after the flexural break.

Quantity: the precision statement is based on a test result = average of six modified cubes (i.e., 3 prisms → 6 halves) from one mortar batch at one age.

Test Equipment associated with ASTM C349 Cement Mortar Compressive Strength Testing

Compression Testing Machine	Must satisfy all requirements of ASTM C109/C109M, and must be hydraulic‑type. A pedestal or hardened steel cylinder is used to position the bearing‑plate assembly on the machine base block.
Bearing plates	Thickness ≥ 25 mm, hard metal; contact faces are rectangles 40.0 mm ± 0.1 mm × 50.8 mm, with the 50.8 mm dimension perpendicular to the longitudinal axis of the prism; Rockwell hardness ≥ 60 HRC; flatness deviation ≤ 0.01 mm when new, maintained within 0.03 mm in service.
Bearing‑plate aligning device & specimen centering guide	Mechanical fixture to guarantee accurate alignment between upper and lower bearing plates and centre the modified‑cube specimen.
Auxiliary tools	Straightedge for flatness inspection, fine emery paper for surface grinding, 0.05 mm shims for fixture adjustment, waterproof plastic sheeting for short‑term specimen covering.

Test parameters and stipulations

Parameter	Stipulation
Loaded (bearing) area	40 mm × 40 mm effective footprint (the 40.0 mm plate dimension lies along the prism axis; the 50.8 mm dimension lies across the 40 mm prism width)
Loading rate	As prescribed in C109/C109M: 900–1800 N/s (200–400 lbf/s), established during the first half of the anticipated maximum load and not changed thereafter
Time limit after flexure	Compression testing must follow the flexure break within 10 min for 24-h specimens, 30 min for all other specimens
Calculation	S_c = 0.00062 P, S_c in MPa to nearest 0.1 MPa, P = total maximum load in N. (0.00062 ≈ 1/1600 mm⁻², the reciprocal of the ~1600 mm² bearing area)
Precision (multilab)	Coefficient of variation 6.3 %; two laboratories' results on one batch should not differ by more than 17.8 % of their average (1s% and d2s% limits per C670)
Precision (single lab)	Coefficient of variation 3.5 %; two tests in one lab (same day or same week, same materials) should not differ by more than 9.9 % of their average
Precision basis	Derived from Type I, IA, IS cements at 3, 7, 28 days and a Type II cement at 1, 3, 7 days

Test Procedure of ASTM C349 Cement Mortar Compressive Strength Testing:

1. After finishing flexural test (ASTM C348), collect both broken prism segments. Screen specimens: retain pieces ≥65 mm long without cracks or chipping; discard defective fragments.

2. Keep specimens under specified curing: 24‑h specimens are covered by waterproof plastic; other‑age specimens stay immersed in 23 ± 2 °C water until test moment.

3. Immediately before compression test: Wipe specimens surface‑dry, remove surface sand grains and incrustations. Inspect loading faces with a straightedge; grind minor unevenness or discard severely warped specimens.

4. Mount pedestal/hardened steel cylinder and centre the bearing‑plate assembly on the hydraulic test machine base block. Use the specimen centering guide to correctly place the modified‑cube fragment inside the bearing fixture, oriented on its side relative to original moulding position, then remove the guide without shifting specimen position.

5. Apply load following loading‑rate rules specified in ASTM C109/C109M. Complete compression test within the allowed time window after flexural fracture (10 min for 24‑h age; 30 min for other ages).

6. Record maximum failure load, compute compressive strength with formula S_c=0.00062P, round result to 0.1 MPa.

7. Eliminate outlier data following the 10 % deviation rule; perform retest if insufficient valid data remain.

Related standard

ISO 679 Cement - Test methods - Determination of strength

EN 196-1 Methods of testing cement-Determination of strength

ASTM C349: Standard Test Method for Compressive Strength of Hydraulic-Cement Mortars (Using Portions of Prisms Broken in Flexure)

KS L 5105 Standard Test Method for Compressive Strength of Hydraulic Cement Mortars

ASTM C109 Compressive Strength of Hydraulic‑Cement Mortars (50 mm cube specimens). This is the official acceptance‑test standard for cement compressive strength. C349 is an alternative reference method and cannot substitute C109/C109M for compliance decisions

AASHTO T106 The highway-agency analogue of C109/C109M.

EN 1015 Methods of test for mortar for masonry-Determination of flexural and compressive strength of hardened mortar

BS 4551 Mortar. Methods of test for mortar and screed. Chemical analysis and physical testing

AS 2701 Methods of sampling and testing mortar for masonry construction

ASTM C348 Flexural Strength of Hydraulic‑Cement Mortars. Produces the fractured prisms used as C349 test specimens; both standards use identical 40 × 40 × 160 mm mortar prisms

EN 934 Admixtures for concrete, mortar and grout-Admixtures for grout for prestressing tendons. Definitions, requirements, conformity, marking and labelling

Main Test Application:

Cement‑mortar laboratory research and material performance comparison;
Hydraulic‑cement product development, blended‑cement, supplementary‑cementitious‑material performance study;
Construction‑material testing laboratories for obtaining paired flexural‑compressive strength data from one batch of prisms;
Educational and academic civil‑engineering material‑testing experiments.

Note: It is not used for factory quality‑control acceptance of cement; for that purpose ASTM C109/C109M is required.

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Hydraulic Compression Strength Testing Machine to test cement, brick and concrete is offered by United Test. Use hydraulic power driving, hydraulic servo control technology, computer to collect and process data, close loop test with high accuracy for various test materials. Consist of frame, oil source, control system, test fixture. Accuracy class 1, max. test load 300KN.

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Q1: What is ASTM C349 test, and why is it important?

A1: ASTM C349‑24 measures compressive strength of hydraulic‑cement mortar using broken segments of 40×40×160 mm prisms that already completed flexural testing per ASTM C348. It is important because labs get both flexural and compressive strength from one set of prisms, saving raw materials, mould space and lab work for research and material comparison. It enables direct analysis of flexure‑to‑compression strength ratio for cement‑based mortars. Note: C349 results are for reference, not official cement acceptance data.

Q2: Can ASTM C349 test results replace ASTM C109/C109M for cement product acceptance?

A2: No. ASTM C109/C109M using purpose‑cast 50 mm cubes is the mandatory standard for cement compliance and acceptance testing. C349 uses fractured prism pieces (“modified cubes”) and generates reference‑only compressive strength values; it cannot substitute C109/C109M for quality‑control acceptance decisions.

Q3: What specimen do I need for ASTM C349 test?

A3: Specimens are two broken fragments from each mortar prism fractured in ASTM C348 flexural test. Each piece must have minimum length of 65 mm, free of cracks, chipping or visible defects. Discard fragments shorter than 65 mm or pieces with obvious damage.

Q4: What is the critical time limit between flexure break and compression test for C349?

A4: For 24‑hour‑age specimens: compression test must start within 10 minutes after flexural fracture. For all other curing ages: finish compression test within 30 minutes after the prism breaks in flexure. Exceeding this time window will cause biased strength test results,

Q5: Why the test matters for the material?

A5: Two properties, one specimen set. It extracts compressive strength from the very prisms already broken in flexure, roughly halving moulding, curing and material effort — valuable when cement supply is limited (research cements, trial clinkers, alternative SCMs).

Paired flexural/compressive data on identical material. Because both values come from the same batch and the same specimen history, the flexural-to-compressive ratio is far more meaningful than when the two are measured on separately cast specimens — useful for studying brittleness, toughness and cracking behaviour of mortar.

Efficiency in multi-age strength development studies. One batch of prisms supports a complete strength–age curve at 1, 3, 7 and 28 days.

Defined precision enables real comparisons. With a stated single-lab CV of 3.5 % and multilab CV of 6.3 %, users can judge whether a difference between cements or batches is real or within test noise — critical for formulation decisions.

Guards against false lows. The strict face-flatness, centering, specimen-orientation, moisture-condition and 10/30-min timing rules exist because a non-plane bearing face or eccentric load can produce results "much lower than the true strength," and oblique fractures systematically under-report strength. Following the method is what makes the number trustworthy.

Clear role in the quality system. It deliberately sits beside — not instead of — C109/C109M, so reference/research data never contaminate contractual acceptance decisions.

Q6: What are common mistakes causing unreliable C349 test data?

A6:

Missing the allowed time window between flexural fracture and compression loading
Poor specimen centering inside bearing‑plate fixture → oblique fracture and low strength
Using chipped, cracked or too‑short (<65 mm) broken prism segments
Ignoring flatness check for loaded specimen faces
Attempting to use C349 results for cement product acceptance (violates standard scope)

Q7. How is C349 different from ASTM C109/C109M?

A7:

Item	ASTM C349	ASTM C109/C109M
Specimen	Halves of 40 × 40 × 160 mm prisms broken in flexure	Separately molded 50 mm cubes
Loaded area	40 mm × 40 mm (~1600 mm²)	50 mm × 50 mm (2500 mm²)
Formula	S_c = 0.00062 P	S_c = P / A
Reporting unit	MPa, to 0.1 MPa	MPa, to 0.1 MPa
Purpose	Reference / research	Cement acceptance and QC
Single-lab CV	3.5 %	≈ 3.0 %

Q8. Why does C349 require a hydraulic testing machine?

A8: The method mandates C109/C109M machine performance but specifies the hydraulic type, because the test needs a smooth, continuously maintained, high-stiffness compressive load with a spherical seating head. Modern closed-loop servo-hydraulic control holds the prescribed 900–1800 N/s automatically and removes operator-induced rate drift, which is one of the largest sources of scatter in mortar strength testing.

Q9: Why choose ASTM C349/C348 Cement Mortar Compression & Flexure Testing Machine from UnitedTest?

A9: UnitedTest supplies fully‑compliant ASTM C349‑24 hydraulic‑cement mortar compressive strength testing machines & bearing‑plate alignment fixtures. Our hydraulic compression testers run modified‑cube compressive tests on broken flexural prisms per ASTM C349, compatible with ASTM C348 and ASTM C109/C109M standards. Ideal for cement‑mortar R&D and construction‑material laboratories worldwide.

UnitedTest is a professional manufacturer of construction‑material mechanical‑testing equipment, delivering complete hardware solutions for the ASTM C349‑24 standard test method for compressive strength of hydraulic‑cement mortars using portions of prisms broken in flexure.

Our hydraulic compression test machine plus matched C349 bearing‑plate assembly, specimen centering guide and alignment fixtures fully satisfy all dimensional, hardness, flatness and operating requirements defined in ASTM C349‑24. The complete set works with 40 × 40 × 160 mm mortar prisms broken in flexure from ASTM C348 bending tests to perform “modified‑cube” compressive strength testing.

Many research labs prefer ASTM C349 because it allows obtaining both flexural and compressive strength from one batch of prisms, cutting material cost and lab workload. UnitedTest’s ASTM C349‑compliant test systems support accurate maximum‑load capture and built‑in calculation for compressive strength (\(S_c=0.00062P\)). The machines can also execute tests following ASTM C348 flexural test and ASTM C109/C109M cube compression tests for multi‑purpose laboratory use.

✅ Complies fully with ASTM C349‑24 requirements

✅ Matched bearing‑plate set (≥60 HRC hardness, strict flatness tolerance)

✅ Complete specimen‑centering alignment fixture as per standard drawing

✅ Hydraulic power source, meets C109/C109M machine requirements

✅ Supports data recording, calculation and result export for mortar‑strength research

✅ Widely used by university civil‑engineering labs, cement R&D centers, third‑party construction‑material inspection institutes across global markets

Important note: ASTM C349 test outputs are for reference research purpose only. For official cement acceptance testing, users need to follow ASTM C109/C109M 50 mm cube test method. UnitedTest also supplies accessories for ASTM C109 and ASTM C348 test setups.

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