ASTM C1064/C1064M-23 PDF

Full title and description

Standard Test Method for Temperature of Freshly Mixed Hydraulic‑Cement Concrete — ASTM C1064/C1064M‑23 specifies the procedure for measuring the temperature of freshly mixed hydraulic‑cement concrete to verify conformance with specified temperature requirements and for quality‑control purposes.

Abstract

This short test method defines required apparatus and measurement procedures to determine the temperature of freshly mixed concrete at the time of sampling. It states unit conventions (SI or inch‑pound used independently), sampling/measurement locations (transporting equipment, forms or sampled portions), verification of temperature‑measuring devices, and reporting requirements. The method is intended to provide an immediate snapshot of concrete temperature rather than a time‑history of temperature change.

General information

• Status: Current standard (active edition).
• Publication date: December 1, 2023 (2023 edition, denoted by the “‑23” suffix).
• Publisher: ASTM International (formerly ASTM, now ASTM International).
• ICS / categories: 91.100.10 (Cement. Gypsum. Lime. Mortar); 91.100.30 (Concrete and concrete products).
• Edition / version: C1064/C1064M‑23 (revises C1064/C1064M‑17).
• Number of pages: 3 (concise, single‑method document).

Scope

The standard covers determination of the temperature of freshly mixed hydraulic‑cement concrete at the time of testing. It covers use of either SI or inch‑pound units (each system to be used independently), apparatus and thermometer verification, sampling and measurement procedures (in transit equipment, forms, or from a sampled portion of the mix), and reporting of the measured temperature. The measured temperature represents the temperature at the time of testing and may not indicate later temperatures.

Key topics and requirements

• Apparatus: suitable container (if sampling) and a temperature‑measuring device of appropriate range and accuracy.
• Verification: requirements to verify accuracy of thermometers/temperature sensors before use.
• Sampling locations: measurement allowed in transporting equipment, in forms, or on a representative sample taken from the mix; sampling practice influences results.
• Unit systems: SI and inch‑pound values are each considered independently (do not combine values across systems).
• Reporting: record measured temperature and the conditions/location of measurement; report to required precision.
• Special note on thermal equilibration: concrete containing aggregate with nominal maximum size greater than 75 mm (3 in.) may require up to about 20 minutes for heat transfer between aggregate and mortar to equalize.

Typical use and users

Used by field technicians, quality control/assurance engineers, ready‑mix producers, concrete testing laboratories, contractors and inspectors to confirm that freshly mixed concrete meets temperature specifications required for placement, curing, or mix acceptance. Also used as a referenced test method in training and certification courses for concrete field testing.

Related standards

Commonly used alongside ASTM standards that address sampling and fresh‑concrete properties, for example: ASTM C172/C172M (Sampling Freshly Mixed Concrete), ASTM C143/C143M (Slump), ASTM C138/C138M (Unit weight, yield, air content gravimetric), ASTM C231/C231M and C173/C173M (air content methods), and practice standards for specimen making and curing such as ASTM C31/C31M. These related documents provide complementary procedures used in field testing and acceptance of fresh concrete.

Keywords

freshly mixed concrete, temperature, thermometer verification, sampling, hydraulic‑cement concrete, SI units, inch‑pound units, thermal equilibration, field testing, quality control.

FAQ

Q: What is this standard?

A: ASTM C1064/C1064M‑23 is a standardized test method for measuring the temperature of freshly mixed hydraulic‑cement concrete at the time of sampling or measurement.

Q: What does it cover?

A: It specifies required apparatus, verification of temperature‑measuring devices, acceptable measurement locations (transporting equipment, forms, or a sampled portion), unit conventions (SI or inch‑pound used independently), and reporting of the measured temperature. The method yields a snapshot temperature reading rather than a time‑history.

Q: Who typically uses it?

A: Field technicians, quality/control engineers, ready‑mix producers, concrete testing laboratories, inspectors, and contractors use C1064 to confirm temperatures for placement, curing and acceptance decisions. Training providers and certification programs also reference the method.

Q: Is it current or superseded?

A: The C1064/C1064M‑23 edition is the current active edition (revising the 2017 edition). Users should always confirm they have the latest edition before applying the method.

Q: Is it part of a series?

A: C1064 is part of the family of ASTM concrete test methods used for fresh‑concrete properties and is commonly used together with sampling and field test standards (for example C172/C172M, C143/C143M, C138/C138M, and C31/C31M).

Q: What are the key keywords?

A: Keywords include freshly mixed concrete, temperature measurement, thermometer verification, sampling, hydraulic‑cement, thermal equilibration, SI units, inch‑pound units, field testing, quality control.