Characterisation of modified hydraulic calcium aluminate
Authors: Li, S. Q.; Hu, J. H.; Liu, B.
Source: Materials Research Innovations, Volume 13, Number 1, March 2009 , pp. 35-40(6)
Publisher: Maney Publishing
Abstract:The new idea to modify calcium aluminate by doping ions P5+ and (P5++Zn2+) has been proposed by the authors. The characterisation of the microstructures of hydraulic calcium aluminate (CA) modified and the hydration paste has been conducted by employing the techniques of X-ray diffraction (XRD), energy dispersive spectroscopy (EDS), infrared (IR) and X-ray photoelectron spectroscopy (XPS). The results reveal that:
(i) three distinguish changes for pure CA have taken place due to the modification: a novel solid solution phase of calcium phosphoaluminte C(A1−xPx) (abbreviation LHSS) present, the low crystallinity of modified CA and the high amount of glassy phase denoted by the high back ground between the angles 2=20–40°
(ii) the increasing amount of non-bridge oxygen and high energy state group of [AlO4], the high degree disorder, the formation of weak bond of Al–O and the distortion of [AlO4] tetrahedron in the structure of CAC are responsible for its high cementing property
(iii) a large amount of gel formed due to the incorporation of ions P+5 and Zn+2, which fills in and binds to the small crystals and generates dense texture in hydrated CAC pastes, in turn, to suppress the undesirable phase transformation
(iv) the mechanical compressive strength of modified calcium aluminte pastes with 0·12 mole P2O5 is as high as 134·02 MPa and that with (0·049 mole P2O5+0·12 mole ZnO) is 104·04 MPa at 360 day hydration.
Document Type: Research Article
Publication date: 2009-03-01
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