ASTM C308-18(2023) PDF

Overview

ASTM C308-18(2023) - Standard Practice for Working, Initial Setting, and Service Strength Setting Times of Chemical-Resistant Resin Mortars establishes standardized test methods to estimate the working time, initial setting time, and service strength setting time of chemical-resistant resin mortars. This practice provides a consistent basis for comparing products, supporting the selection and quality control of chemical-resistant mortars used in harsh industrial environments. However, results should complement, not exclusively dictate, material selection for specific applications.

Key Topics

• Working Time: Indicates how long the chemical-resistant resin mortar remains usable and workable after mixing. Monitoring the working time helps applicators handle and install materials efficiently.

• Initial Setting Time: Refers to the interval necessary for the resin mortar to start hardening, offering insight into when subsequent construction or finishing processes can begin.

• Service Strength Setting Time: Determines the time required for the mortar to achieve at least 90% of the manufacturer's stated tensile strength. This ensures the installation reaches reliable performance before being placed in service.

• Apparatus and Measurement: Utilizes specific equipment such as weighing devices, mixing pans, bricklayer’s trowels, prescribed brick types, and the Vicat apparatus for setting time characterization, ensuring repeatability and reliability in results.

• Standard Temperature Compliance: All testing should be performed at a controlled temperature of 23°C ±2°C (73°F ±4°F) unless otherwise agreed between user and manufacturer.

• Safety and Compliance: User responsibility includes adherence to safety, health, and environmental protocols, and compliance with relevant regulatory limitations.

Applications

ASTM C308-18(2023) is vital for professionals involved in the specification, application, and quality assurance of chemical-resistant resin mortars, including:

• Industrial Flooring: Ensuring prompt and durable installation of resin-based flooring in chemical processing plants, laboratories, and food & beverage facilities.
• Protective Linings: For tanks, secondary containment, or surfaces exposed to aggressive chemicals, accurate timing measurements minimize installation risks and optimize performance.
• Masonry Work: Application in projects requiring enhanced chemical resistance in bricks and block installations, ensuring appropriate cure times before exposure to harsh environments.
• Quality Control: Manufacturers and contractors can compare mortar performance, verify materials meet project timelines, and document compliance with contractual and regulatory requirements.

Adhering to the guidelines in ASTM C308-18(2023) supports project reliability, minimizes downtime, and ensures long-term chemical resistance of installations.

Related Standards

ASTM C308-18(2023) references and aligns with other key ASTM standards and terminology, including:

• ASTM C279 - Specification for Chemical-Resistant Masonry Units
• ASTM C307 - Test Method for Tensile Strength of Chemical-Resistant Mortar, Grouts, and Monolithic Surfacings
• ASTM C904 - Terminology Relating to Chemical-Resistant Nonmetallic Materials

These standards, collectively, offer a comprehensive framework for selecting, applying, and verifying chemical-resistant systems in industrial environments.

Keywords: ASTM C308, chemical-resistant resin mortars, working time, initial setting time, service strength setting time, industrial flooring, protective coatings, mortar application, standard practice, performance testing.