ISO 23945-1:2022 PDF

Name: ISO 23945-1:2022 — Test methods for sprayed concrete — Part 1: Flash setting accelerating admixtures — Setting time
SKU: ISO 23945-1:2022
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Test methods for sprayed concrete — Part 1: Flash setting accelerating admixtures — Setting time

Название (английский):

ISO 23945-1:2022

Test methods for sprayed concrete — Part 1: Flash setting accelerating admixtures — Setting time

Статус документа:: Действующий
Формат:: Электронный (PDF)
Количество страниц:: 8
Дата публикации:: 11 июля 2022 г.
Издание:: ISO IS 23945 edition 1 version 1
ICS:: 91.100.30

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Описание (английский):

This document specifies the test method, sampling, procedure and determination of cement paste containing a flash setting accelerating admixture for sprayed concrete. Related terms and definitions are also given. This document does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this document to establish appropriate safety and health practices and determine the applicability of regulatory limitations prior to use.

Abstract

Похожие стандарты

Стандарты, упомянутые в описании

Overview

ISO 23945-1:2022 defines a standardized test method for evaluating the setting time of cement paste containing flash setting accelerating admixtures used in sprayed concrete (shotcrete). The standard specifies sampling, apparatus, environmental conditions, specimen preparation and the procedure-using Vicat apparatus-to determine initial and final setting times for both powdery and liquid accelerating admixtures. It also provides related terms and normative flow charts for paste preparation.

Key topics and technical requirements

Scope and purpose

Tests the effect of a particular cement + flash setting accelerating admixture combination on setting time.
Intended for sprayed concrete / shotcrete applications; includes regional test conditions for tropical/subtropical climates.

Test environment

Standard: (20 ± 2) °C and relative humidity > 50 %.
Alternative for tropical/subtropical: (27 ± 2) °C and 65 ± 5 % RH.

Apparatus & specimen

Vicat apparatus and Vicat mould (top Ø 65 ±0.5 mm, bottom Ø 75 ±0.5 mm, depth 40 ±0.2 mm).
Flat trowel, mixer, glass graduates, balances (accuracy ±1 g / ±0.5 g), 50 ml syringe for liquid admixtures.

Materials

Portland cement conforming to ISO 22965 series with specified fineness, C3A and alkali ranges and ≥ 42.5 28‑day strength.
Distilled/deionized water recommended for validation.

Preparation & procedure

Typical test batch: 400 g cement with 140 g water (including water in liquid admixtures).
Powdery admixture: dry pre-mix 10 s, add water and mix 5 s (low) + 15 s (high).
Liquid admixture: pre-mix cement + water 30 s (low), add liquid admixture and mix 5 s (low) + 15 s (high).
Moulding within 50 s after final admixture addition; measure setting time immediately with frequent checks near initial set.

Safety and applicability

The standard does not replace site safety practices; users must ensure regulatory and health compliance. Laboratory results may not exactly replicate field shotcreting conditions.

Applications and who uses it

Admixture manufacturers: product validation and technical data sheets for flash setting accelerating admixtures.

Shotcrete and sprayed concrete contractors: selecting and qualifying admixtures for tunnelling, mining, repairs, and rapid stabilization.

Materials testing laboratories: routine quality control and conformity testing of cement–admixture combinations.

Specifiers and engineers: assessing suitability of admixtures for fast-setting applications and establishing mix controls.

Related standards

ISO 679 (cement strength test methods)

ISO 9597 (setting time and soundness)

ISO 22904 / ISO 22965 (additions / concrete)

ISO 29581‑1 / ‑2 (cement chemical analysis)

EN 196‑2, EN 196‑6; ASTM C187

Keywords: ISO 23945-1, sprayed concrete, flash setting accelerating admixture, setting time, shotcrete testing, Vicat, cement paste.

ISO 23945-1:2022 PDF

Abstract

Похожие стандарты

Overview

Key topics and technical requirements

Applications and who uses it

Related standards

Технические детали

ISO 22965-2:2007

Concrete — Part 2: Specification of constituent materials, production of concrete and compliance of concrete

ISO 679:1989

Methods of testing cements — Determination of strength

ISO 9597:1989

Cements — Test methods — Determination of setting time and soundness

BS ISO 22904:2020

Additions for concrete.

ISO 29581-1:2009

Cement — Test methods — Part 1: Analysis by wet chemistry