ISO 18650-2:2014 PDF

Name: ISO 18650-2:2014 — Building construction machinery and equipment — Concrete mixers — Part 2: Procedure for examination of mixing efficiency
SKU: ISO 18650-2:2014
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Building construction machinery and equipment — Concrete mixers — Part 2: Procedure for examination of mixing efficiency

Название (английский):

ISO 18650-2:2014

Building construction machinery and equipment — Concrete mixers — Part 2: Procedure for examination of mixing efficiency

Статус документа:: Отменён
Формат:: Электронный (PDF)
Количество страниц:: 19
Дата публикации:: 17 сентября 2014 г.
Издание:: ISO IS 18650 edition 2 version 1
ICS:: 91.220

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Описание (английский):

ISO 18650-2:2014 specifies the procedure and requirements for examination of the mixing efficiency of batch-type and continuous-type concrete mixers as defined in ISO 18650-1. It is applicable to concrete mixers having a rated capacity greater than or equal to 70/50.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 18650-2:2014 - Building construction machinery and equipment - Concrete mixers - Part 2 - specifies the standardized procedure to examine the mixing efficiency of batch-type and continuous-type concrete mixers (as defined in ISO 18650-1). It applies to mixers with a rated capacity greater than or equal to 70/50 and defines the test program, sampling, measurements and evaluation criteria used to quantify how uniformly a mixer produces concrete.

Key topics and requirements

Mixing performance test: Determination of uniformity by measuring variances in key mix parameters and compressive strength of sampled specimens.

Measured parameters:

Air content (pressure method referenced)
Mortar content per unit volume
Coarse aggregate content per unit volume
Consistency (slump)
Compressive strength of cubes/cylinders

Variance calculation: The standard provides a formula to calculate percentage variance (ΔX) between two sampled portions against their average, used for evaluation of uniformity.

Concrete mix preparation: Typical target values are provided (e.g., coarse aggregate up to 20 mm or 25 mm, slump 80 ± 30 mm, air content 4.5 ± 1.5 %, compressive strength 25 ± 5 N/mm2). Weighing tolerance for constituents is ±3 %.

Mixing time guidance: Manufacturer’s specified mixing time is preferred; when unavailable, the standard gives recommended approximate mixing times for gravity, compulsory (pan/paddle) and continuous mixers (examples include ~60 s for small batch gravity mixers, 30 s for small compulsory mixers, minimum 10 s residence for continuous mixers).

Sampling rules: Minimum sample volumes - 20 L for batch mixers, 100 L for continuous mixers; sampling locations and timing are specified for different mixer types and for hoppers.

Equipment verification & operational checks: Mixer geometry, RPM, discharge, and restart capability (drive should restart after 5 min) must conform to manufacturer’s instructions; permitted loss of mix before discharge is limited.

Applications and users

Quality assurance and performance testing of concrete mixer equipment

Mixer manufacturers for design verification and claims substantiation

Testing laboratories conducting mixing-efficiency certification and acceptance tests

Construction contractors, plant operators and QA/QC engineers who need objective criteria for mixer selection, commissioning and site acceptance

Certification bodies and procurement teams evaluating mixer uniformity and consistency

Related standards

ISO 18650-1 (Vocabulary and general specifications)

ISO 1920 series (Testing of concrete - sampling, properties, making/curing specimens, strength)

ISO 3310-1 (Test sieves)

ISO 6783, ISO 7033 (aggregate test methods)

ISO 11375 (terms and definitions)

ISO 18650-2:2014 provides a practical, reproducible framework for measuring and reporting concrete mixer performance, enabling consistent acceptance testing, product comparison and reliable field operation.

ISO 18650-2:2014 PDF

Abstract

Похожие стандарты

Overview

Key topics and requirements

Applications and users

Related standards

Технические детали

ISO 18650-1:2004

Building construction machinery and equipment — Concrete mixers — Part 1: Vocabulary and general specificatio…

SIST EN ISO 19204:2023

Soil quality - Procedure for site-specific ecological risk assessment of soil contamination (soil quality TRI…

BS ISO 3310-1:2016

Test sieves. Technical requirements and testing. Test sieves of metal wire cloth.

ISO 6783:1982

Coarse aggregates for concrete — Determination of particle density and water absorption — Hydrostatic balance…

ISO 7033:1987

Fine and coarse aggregates for concrete — Determination of the particle mass-per-volume and water absorption…

ISO 11375:1998

Building construction machinery and equipment — Terms and definitions