ISO 13765-4:2004

Refractory mortars — Part 4: Determination of flexural bonding strength

ISO 13765-4:2004 describes a method of determination of the flexural bonding strength of the bonded face between refractory bricks laid with refractory mortars (after drying and firing).

Mortiers réfractaires — Partie 4: Détermination de la résistance des liaisons à la flexion

General Information

• Status: Published
• Publication Date: 14-Jun-2004
• ICS: 81.080 - Refractories
• Technical Committee: ISO/TC 33 - Refractories
• Drafting Committee: ISO/TC 33/WG 27 - Refractory mortars – Determination of permanent change in dimension on heating
• Current Stage: 9093 - International Standard confirmed
• Completion Date: 05-Sep-2023

Standards Content (Sample)

INTERNATIONAL ISO
STANDARD 13765-4
First edition
2004-06-01
Refractory mortars —
Part 4:
Determination of flexural bonding
strength
Mortiers réfractaires —
Partie 4: Détermination de la résistance des liaisons à la flexion

Reference number
ISO 13765-4:2004(E)
©
ISO 2004

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ISO 13765-4:2004(E)
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ISO 13765-4:2004(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the International
Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
ISO 13765-4 was prepared by Technical Committee ISO/TC 33, Refractories.
ISO 13765 consists of the following parts, under the general title Refractory mortars:
— Part 1: Determination of consistency using the penetrating cone method
— Part 2: Determination of consistency using the reciprocating flow table method
— Part 3: Determination of joint stability
— Part 4: Determination of flexural bonding strength
— Part 5: Determination of grain size distribution (sieve analysis)
— Part 6: Determination of moisture content of ready-mixed mortars
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INTERNATIONAL STANDARD ISO 13765-4:2004(E)
Refractory mortars —
Part 4:
Determination of flexural bonding strength
1Scope
This part of ISO 13765 describes a method of determination of the flexural bonding strength of the bonded face
between refractory bricks laid with refractory mortars (after drying and firing).
2 Normative references
The following referenced documents are indispensable for the application of this document. For dated
references, only the edition cited applies. For undated references, the latest edition of the referenced document
(including any amendments) applies.
ISO 8656-1, Refractory products — Sampling of raw materials and unshaped products — Part 1: Sampling
scheme
ISO 13765-1, Refractory mortars — Part 1: Determination of consistency using the penetrating cone method
ISO 13765-2, Refractory mortars — Part 2: Determination of consistency using the reciprocating flow table
method
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
flexural bonding strength
maximum stress that a specimen can withstand when it is bent on a three-point bending device
4 Principle
A prismatic specimen of a given size is made by bonding two test pieces of refractory brick with the refractory
mortar to be tested. After drying and firing, a bending stress is applied at a given loading rate on the bonding
face of the specimen at room temperature until failure of the bonding face occurs.
5 Apparatus
5.1 Loading device, consisting of two bearing edges and a loading edge which are parallel to each other, as
shown in Figure 1.
The loading edge shall be located between, and isometric to, the two bearing edges. The values of L and R,
s
the tolerances for the parallelism of the cross section sides and the parallelism of the top and bottom faces shall
be as specified in Table 1. The loading device shall be able to apply a load at a uniform rate on the middle of the
specimen and have the loading rate shown in Table 1.
5.2 Mixer, as specified in ISO 13765-1 or ISO 13765-2.
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ISO 13765-4:2004(E)
Dimensions in millimetres
Key
L distance between the supports
s
R radius of curvature of the loading edge and bearing edges
Figure 1 — Loading device
Table 1 — Dimensions, tolerances and loading rates associated with test pieces of various sizes
Test piece size Tolerance for Tolerance Tolerance Distance Radius of Loading rate
the breadth, b, for the for the between curvature, , R
and height, h parallelism of parallelism of the of the loading
the cross- the top and supports edge and
section sides bottom faces L bearing edges
s
l × b × h N/s
Dense Insulating
shape shape
mm mm mm mm mm mm mm mm
115× 114× 76 —— — 180±115± 0,5 370± 37 120± 12
115× 114× 64 —— — 180±115± 0,5 260± 26 86± 8,6
100× 40× 40 ± 1 ± 0,15 ± 0,25 180±15± 0,5 36± 3,6 12± 1,2
57,5× 25× 25 ± 1 ± 0,1 ± 0,2 100±15± 0,5 13± 1,3 4,2± 0,42
57× 40× 40 ± 1 ± 0,15 ± 0,25 100±14± 0,5 64± 6,4 21± 2,1
◦ ◦
5.3 Electrical drying oven, fitted with a temperature controller and capable of operating at 110 C± 5 C.
5.4 Consistency determining device, as specified in ISO 13765-1 or ISO 13765-2.
5
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