Early Hydration Process of Portland Cement Paste by Electrical Measurement

An electrical measurement technique was used to measure the electrical resistivity of cement paste having varying water/cement (w/c) ratios, and consequently the paste properties and characteristics were analyzed. The different hydration periods were identified from the electrical resistivity curve...

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Bibliographic Details
Published in:Journal of materials in civil engineering 2006-02, Vol.18 (1), p.99-105
Main Authors: Wei, Xiaosheng, Li, Zongjin
Format: Article
Language:English
Subjects:
Applied sciences
Buildings. Public works
Cement concrete constituents
Cements
Exact sciences and technology
Hydration
Materials
Properties of anhydrous and hydrated cement, test methods
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Summary:An electrical measurement technique was used to measure the electrical resistivity of cement paste having varying water/cement (w/c) ratios, and consequently the paste properties and characteristics were analyzed. The different hydration periods were identified from the electrical resistivity curve and the differential electrical resistivity curve. The setting time for the samples is reached before the first peak of the differential electrical resistivity curve, and this can provide a new method to determine setting time by using electrical resistivity measurements. The relation between w/c ratio and bulk resistivity at a fixed curing time follows a power law, so electrical resistivity can be used for determination of the w/c ratio in fresh and hardened cement pastes after calibration.
ISSN:0899-1561
1943-5533
DOI:10.1061/(ASCE)0899-1561(2006)18:1(99)