ISO 13765-5:2004

Overview

ISO 13765-5:2004 specifies the international standard method for determining the grain size distribution of refractory mortars by sieve analysis. This standard belongs to the ISO 13765 series, focused on refractory mortars, and details procedures for accurate sieve analysis-both dry and wet-to assess the particle size distribution of mortars used in high-temperature applications. Established by ISO Technical Committee ISO/TC 33 on refractory materials, this standard ensures consistent quality control and material characterization in refractory mortar production.

Key Topics

• Scope and Purpose

  • Defines a standardized method for grain size distribution analysis using a series of progressively finer sieves.
  • Applicable to both dry mortars and ready-to-use mortars through dry and wet sieve analysis.

• Testing Methods

  • Dry sieve analysis for chemically bonded mortars.
  • Wet sieve analysis for ready-to-use mortars and dry mortars to improve reproducibility.

• Equipment and Materials

  • Standardized 200 mm diameter sieves complying with ISO 565.
  • Sieve shaker capable of handling multiple sieves simultaneously.
  • Precision balances with ±0.1 g accuracy.
  • Drying oven maintaining 110 °C ± 5 °C.

• Sampling and Sample Preparation

  • Sampling procedures aligned with ISO 8656-1 for raw and prepared mortar materials.
  • Sample size typically 50 grams or more.
  • Use of quartering or riffle splitters for sample size reduction.

• Calculation and Reporting

  • Calculation of incremental and cumulative mass fractions passing or retained by each sieve.
  • Reporting results with an accuracy of ±1% and documenting all test conditions.
  • Inclusion of moisture content adjustment for wet analyses based on ISO 13765-6.

• Quality Assurance

  • Duplicate testing to verify reproducibility.
  • Criteria for result acceptance, including maximum allowable variance between duplicate tests.

Applications

ISO 13765-5:2004 is essential for industries and laboratories involved in manufacturing, quality control, and research of refractory mortars, particularly in:

• Refractory Construction

  • Ensuring optimum particle size for mechanical strength and stability of refractory joints.

• Material Development

  • Assisting in mortar formulation to meet specific performance criteria.

• Quality Control

  • Routine testing for batch uniformity to maintain consistent product quality.

• Research and Development

  • Assessing the impact of grain size distribution on mortar properties such as flowability and binding strength.

Effective implementation of this standard aids in the production of durable refractory mortars that can withstand thermal and mechanical stresses in furnaces, kilns, and other high-temperature industrial equipment.

Related Standards

• ISO 565 – Specifies nominal sieve opening sizes and manufacturing criteria for metal sieves used in control testing.
• ISO 8656-1 – Provides guidelines for sampling raw and prepared refractory materials.
• ISO 13765-1 to 13765-6 – Other parts of the refractory mortars series covering consistency, stability, strength, grain size, and moisture content:
  • Part 1: Consistency by cone penetration method.
  • Part 2: Consistency by flow table method.
  • Part 3: Joint stability determination.
  • Part 4: Flexural bond strength.
  • Part 6: Moisture content determination for ready-to-use mortars.

Adherence to the entire ISO 13765 series ensures comprehensive evaluation and standardization of refractory mortars, fostering interoperability and high-quality performance in refractory applications.

Keywords: ISO 13765-5, refractory mortars, grain size distribution, sieve analysis, dry sieve method, wet sieve method, refractory mortar testing, refractory material standards, particle size distribution, refractory joint quality, ISO refractory mortars.