UR2: Ultra-rapid reactivity test for real-time, low-cost quality control of calcined clays

IF 10.9 1区工程技术 Q1 CONSTRUCTION & BUILDING TECHNOLOGY

Cement and Concrete Research Pub Date : 2025-02-10 DOI:10.1016/j.cemconres.2025.107806

Yujia Min, Hossein Kabir, Chirayu Kothari, M. Farjad Iqbal, Nishant Garg

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引用次数: 0

Abstract

To reduce cement's carbon footprint, there is growing interest in commercial adoption of sustainable SCMs such as calcined clays. However, the existing ASTM standard (R³ test, C1897) to test the reactivity of such clays takes up to 7 days and cannot be used for real-time quality control in an industrial setting. We address this issue by introducing a 5-min Ultra-Rapid Reactivity (UR²) test. By dissolving 47 clay specimens in 4 M NaOH solutions at 90 °C, we report that a dissolution index of 1.54Al + Si correlates strongly to the 7-day R³ heat (R² = 0.92, RMSE = 94.1 J/g). This dissolution index also correlates to the 28-day compressive strength for 14 clay mixtures (R² = 0.94, RMSE = 1.7 MPa). This UR² test relies on colorimetry and can be conducted via off-the-shelf, low-cost cameras. Overall, our new UR² test opens a pathway for real-time, low-cost quality control of calcined clays.

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来源期刊

Cement and Concrete Research 工程技术-材料科学：综合

CiteScore

20.90

自引率

12.30%

发文量

318

审稿时长

53 days

期刊介绍： Cement and Concrete Research is dedicated to publishing top-notch research on the materials science and engineering of cement, cement composites, mortars, concrete, and related materials incorporating cement or other mineral binders. The journal prioritizes reporting significant findings in research on the properties and performance of cementitious materials. It also covers novel experimental techniques, the latest analytical and modeling methods, examination and diagnosis of actual cement and concrete structures, and the exploration of potential improvements in materials.