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Proceedings Paper

Hydration kinetics of cement composites with varying water-cement ratio using terahertz spectroscopy
Author(s): Shaumik Ray; Jyotirmayee Dash; Nirmala Devi; Saptarshi Sasmal; Bala Pesala
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Paper Abstract

Cement is mixed with water in an optimum ratio to form concrete with desirable mechanical strength and durability. The ability to track the consumption of major cement constituents, viz., Tri- and Dicalcium Silicates (C3S, C2S) reacting with water along with the formation of key hydration products, viz., Calcium-Silicate-Hydrate (C-S-H) which gives the overall strength to the concrete and Calcium Hydroxide (Ca(OH)2), a hydration product which reduces the strength and durability, using an efficient technique is highly desirable. Optimizing the amount of water to be mixed with cement is one of the main parameters which determine the strength of concrete. In this work, THz spectroscopy has been employed to track the variation in hydration kinetics for concrete samples with different water-cement ratios, viz., 0.3, 0.4, 0.5 and 0.6. Results show that for the sample with water-cement ratio of 0.3, significant amount of the C3S and C2S remain unreacted even after the initial hydration period of 28 days while for the cement with water-cement ratio of 0.6, most of the constituents get consumed during this stage. Analysis of the formation of Ca(OH)2 has been done which shows that the concrete sample with water-cement ratio of 0.6 produces the highest amount of Ca(OH)2 due to higher consumption of C3S/C2S in presence of excess water which is not desirable. Samples with water-cement ratio of 0.4 and 0.5 show more controlled reaction during the hydration which can imply formation of an optimized level of desired hydration products resulting in a more mechanically strong and durable concrete.

Paper Details

Date Published: 14 March 2015
PDF: 7 pages
Proc. SPIE 9362, Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII, 936211 (14 March 2015); doi: 10.1117/12.2079127
Show Author Affiliations
Shaumik Ray, CSIR-Central Electronics Engineering Research Institute (India)
CSIR-SERC (India)
Jyotirmayee Dash, CSIR-Central Electronics Engineering Research Institute (India)
CSIR-SERC (India)
Nirmala Devi, CSIR-Central Electronics Engineering Research Institute (India)
CSIR-SERC (India)
Saptarshi Sasmal, CSIR-Structural Engineering Research Ctr. (India)
CSIR-SERC (India)
Bala Pesala, CSIR - Central Electronics Engineering Research Institute (India)
CSIR - SERC (India)


Published in SPIE Proceedings Vol. 9362:
Terahertz, RF, Millimeter, and Submillimeter-Wave Technology and Applications VIII
Laurence P. Sadwick; Tianxin Yang, Editor(s)

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