Repeatability and reproducibility challenges of isothermal heat flow calorimetry with in situ mixing

John E, Jakob C, Pott U, Sando M (2025)

Publication Language: English

Publication Type: Journal article

Publication year: 2025

Journal

Cement and Concrete Research Elsevier

Book Volume: 194

Article Number: 107872

DOI: 10.1016/j.cemconres.2025.107872

Abstract

Isothermal heat flow calorimetry evaluates heat development during binder reactions. It distinguishes between in situ calorimetry, where mixing occurs within the device, and ex situ calorimetry, involving externally mixed samples. Despite ex situ calorimetry being a standard method in binder research, in situ calorimetry is underutilized. This paper aims to promote its adoption by summarizing challenges related to repeatability and reproducibility and offering solutions. The initial section addresses repeatability issues caused by preventable errors, providing a structured guide for experimental design. It was found that water leakage had minimal impact, and sample size is crucial for data robustness. The second section examines operational challenges, revealing that frictional heating, affecting recorded heat, can be minimized with an optimized mixing protocol. The final part highlights that significant errors in measured data stem from signal delay and heat loss, offering methods to correct these issues for improved reproducibility in in situ calorimetric experiments.

Authors with CRIS profile

Cordula Wolf Lehrstuhl für Mineralogie

Involved external institutions

Bundesanstalt für Materialforschung und -prüfung (BAM) DE Germany (DE) Technische Universität Berlin DE Germany (DE)

How to cite

APA:

John, E., Jakob, C., Pott, U., & Sando, M. (2025). Repeatability and reproducibility challenges of isothermal heat flow calorimetry with in situ mixing. Cement and Concrete Research, 194. https://doi.org/10.1016/j.cemconres.2025.107872

MLA:

John, Elisabeth, et al. "Repeatability and reproducibility challenges of isothermal heat flow calorimetry with in situ mixing." Cement and Concrete Research 194 (2025).

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