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Solid state 29Si and 27Al NMR and FTIR study of cement pastes containing industrial wastes and organics

✍ Scribed by R.A. Hanna; P.J. Barrie; C.R. Cheeseman; C.D. Hills; P.M. Buchler; R. Perry

Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
762 KB
Volume
25
Category
Article
ISSN
0008-8846

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✦ Synopsis

Si and nAl NMR and FTIR have been used to study the products of OPC hydration in the presence of a heavy metal containing stabilized waste which is commercially solidified, selected organics and pulverised fuel ash. *'Si NMR unambiguously quantifies the extent of silicate polymerisation, which is severely retarded in mixes containing the stabilized waste. 27A1 NMR spectroscopy indicates the presence of both ettringite and monosulfate in a cement containing 2% of the stabilized waste, while only ettringite is detected in the spectra of samples with 19 and 30% additions. Phenol and ethylamine also reduce silicate condensation, although a sample containing both the metal waste and mixed organics showed silicate condensation levels similar to those found in a normal OPC paste. It is difficult to draw firm conclusions from the FTIR results due to band overlap in the region of interest.

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