ASTM C31/C31M Quiz & Flashcards for Concrete Testing

Study Notes

Standard Practice Overview

Developed in accordance with international standardization principles by the World Trade Organization's TBT Committee.
Designation C31/C31M - 19 indicates original adoption year or last revision year.
Covers procedures for making and curing cylinder and beam specimens from fresh concrete samples.

Sample Collection Protocol

Concrete must be sampled after all on-site adjustments including mix water and admixtures.
Inadequate for samples of concrete without measurable slump or requiring different dimensions.

Measurement Units

Standard values are provided in both SI units and inch-pound units.

Mold Specifications

Molds should have smooth interior surfaces, and dimensions must maintain right angles and straight lines.
Maximum variation from nominal cross-section is capped at 3 mm for molds 150 mm in depth.

Terminology Definitions

Initial curing temperature refers to environmental temperature during the early curing stage, which may differ from concrete temperature.

Equipment Requirements

Tamping rods should have a diameter as per specifications and extend beyond mold depth by at least 100 mm.
Internal vibrators must operate at a frequency of at least 150 Hz and have dimensions that meet specific guidelines for mold compatibility.

Significance of Standard Practice

Establishes standardized methods for making, curing, protecting, and transporting concrete test specimens in the field.
Provides reliable data for strength testing, mixture adequacy checks, and quality control.

Molds Integrity and Maintenance

Molds must maintain shape and dimensions; they should be watertight to prevent water leakage.
Reusable molds should be treated with a non-reactive form release material prior to use.

Finishing and Sampling Equipment

Recommended finishing tools include handheld floats or trowels for smooth finishing.
Slump measurement requires specific apparatus to conform to industry standards.

Quality Assurance Measures

Acceptance testing for concrete strength, mixture adequacy assessment, and ongoing quality control can be performed if specimens are correctly prepared and cured.

Description

Quiz about the standard practice for making and curing concrete test specimens in the field, based on the ASTM C31/C31M standard. Learn about the principles and guidelines for concrete testing and curing. Improve your knowledge of concrete technology and testing methods.