ASTM D7949-14 PDF

Full title and description

ASTM D7949-14 — Standard Test Methods for Thermal Integrity Profiling of Concrete Deep Foundations. This standard describes test procedures for measuring temperature profiles in cast‑in‑place concrete deep foundation elements (bored piles, drilled shafts, augered piles, diaphragm walls, barrettes, dams, and similar) to evaluate the homogeneity and early‑age integrity of the concrete mass.

Abstract

ASTM D7949-14 provides two alternative thermal integrity profiling procedures: Method A (temperature probe lowered into access ducts) and Method B (multiple embedded thermal sensors attached to the reinforcement cage). The measured thermal profile produced by heat of hydration is used qualitatively to detect anomalies in concrete placement, reinforcement position, or gross defects during early curing. The standard sets minimum requirements, references Practice D6026 for significant digits/rounding, and notes limitations (does not identify exact defect type and is primarily effective during early cure).

General information

• Status: Withdrawn / historical (withdrawal recorded in 2023).
• Publication date: 2014 (designated D7949‑14; original publication issued in 2014, listed in late Oct–Nov 2014 in bibliographic records).
• Publisher: ASTM International (American Society for Testing and Materials).
• ICS / categories: Concrete structures / deep foundations (ICS code commonly associated with referenced records: 91.080.40).
• Edition / version: D7949‑14 (2014 edition).
• Number of pages: Approximately 7 pages (typical published PDF length).

Scope

Specifies minimum test methods for thermal integrity profiling (TIP) of cast‑in‑place deep foundation elements. Two procedures are defined: Method A—use of a thermal probe lowered into access ducts installed during construction; Method B—use of multiple embedded thermal sensors (thermocouples or similar) attached to the reinforcement cage. The standard applies primarily to early‑age monitoring where the heat of hydration produces measurable temperature signals that can indicate anomalies or inhomogeneities. The standard also advises that additional project‑specific requirements may be specified by a qualified engineer.

Key topics and requirements

• Two accepted measurement approaches: thermal probe in access ducts (Method A) and embedded sensor arrays (Method B).
• Recommended sensor spacing, data‑collection practices, and emphasis on using Practice D6026 rules for significant digits and rounding.
• Use of temperature profiles to assess homogeneity, reinforcement position relative to concrete center, and detection of gross anomalies (inclusions, voids, cold joints—note that TIP indicates presence of an anomaly but generally does not identify exact flaw type).
• Limitations: primary applicability during early cure; interpretation requires engineering judgment; proper installation of access ducts or sensors is critical.
• Unit conventions: values stated in SI units are to be regarded as standard.
• Emerging practices: higher‑resolution approaches such as distributed fiber‑optic sensing (DTS) are increasingly used in research and practice to enhance spatial resolution beyond conventional thermocouples.

Typical use and users

Used by geotechnical and structural engineers, foundation contractors, materials and testing laboratories, transportation agencies, and quality‑assurance/inspection teams to perform non‑destructive evaluation of deep foundation elements shortly after placement. Commonly applied on projects requiring pile/shaft integrity verification (bridges, high‑rise foundations, critical infrastructure). Interpretation and reporting are performed by qualified personnel with experience in deep foundation testing.

Related standards

Typical complementary or alternative standards and references include: ASTM D6760 (ultrasonic crosshole testing for deep foundations); Practice D6026 (significant digits/rounding guidance); other foundation integrity and testing methods such as crosshole, sonic/low‑strain testing, and coring guidance (examples often referenced in conjunction: Test Methods D1143, D4945, D5882). Users should consult the project specification and agency requirements for the complete set of applicable standards.

Keywords

thermal integrity profiling, TIP, deep foundations, bored pile, drilled shaft, augered pile, diaphragm wall, barrettes, heat of hydration, thermocouple, thermal probe, distributed temperature sensing, pile integrity, ASTM D7949.

FAQ

Q: What is this standard?

A: ASTM D7949‑14 is a 2014 ASTM test methods document that defines procedures for thermal integrity profiling (TIP) of cast‑in‑place concrete deep foundations to detect gross inhomogeneities using temperature measurements.

Q: What does it cover?

A: It covers two methods for measuring temperature vs depth in deep foundations (Method A: thermal probe in access ducts; Method B: embedded thermal sensors on the reinforcement cage), guidance on data collection/processing, limitations of the techniques, and references to related ASTM practices (for example, D6026 for rounding and significant digits).

Q: Who typically uses it?

A: Geotechnical and structural engineers, foundation contractors and installers, materials and geotechnical testing laboratories, consultants performing pile/shaft integrity evaluation, and public agencies (transportation, utilities, dam authorities) that require verification of deep‑foundation construction.

Q: Is it current or superseded?

A: The D7949‑14 text is recorded in bibliographic sources as withdrawn (withdrawal noted in 2023). For current practice or an active document, contact ASTM International or the responsible committee for the latest status, any reinstated/revised versions, or successor standards.

Q: Is it part of a series?

A: It belongs to ASTM’s family of deep‑foundation integrity testing standards developed under Committee D18. Related ASTM methods (crosshole ultrasonic testing, single‑hole, low‑strain sonic tests) are often used alongside TIP as complementary evaluation tools.

Q: What are the key keywords?

A: Thermal integrity profiling, TIP, heat of hydration, thermocouples, thermal probe, deep foundations, bored pile, drilled shaft, integrity testing, ASTM D7949.