Aluminum-rich belite sulfoaluminate cements: Clinkering and early age hydration

Journal Article · Mon Mar 15 04:00:00 EDT 2010 · Cement and Concrete Research

DOI:https://doi.org/10.1016/j.cemconres.2009.11.003· OSTI ID:21344746

Martin-Sedeno, M Carmen; Cuberos, Antonio J.M.; De la Torre, Angeles G; Alvarez-Pinazo, Gema ^[1]; Ordonez, Luis M ^[2]; Gateshki, Milen ^[3]

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1. Departamento de Quimica Inorganica, Cristalografia y Mineralogia, Universidad de Malaga, 29071 Malaga (Spain)
2. Unidad Tecnica de Investigacion de Materiales, AIDICO, Avda. Benjamin Franklin, 17 Paterna, Valencia (Spain)
3. PANalytical, B.V. P.O. Box 13. 7600 AA Almelo (Netherlands)

Belite sulfoaluminate (BSA) cements have been proposed as environmentally friendly building materials, as their production may release up to 35% less CO{sub 2} into the atmosphere when compared to ordinary Portland cements. Here, we discuss the laboratory production of three aluminum-rich BSA clinkers with nominal mineralogical compositions in the range C{sub 2}S (50-60%), C{sub 4}A{sub 3}$$ (20-30%), CA (10%) and C{sub 12}A{sub 7} (10%). Using thermogravimetry, differential thermal analysis, high temperature microscopy, and X-ray powder diffraction with Rietveld quantitative phase analysis, we found that burning for 15 min at 1350 deg. C was the optimal procedure, in these experimental conditions, for obtaining the highest amount of C{sub 4}A{sub 3}$$, i.e. a value as close as possible to the nominal composition. Under these experimental conditions, three different BSA clinkers, nominally with 20, 30 and 30 wt.% of C{sub 4}A{sub 3}$$, had 19.6, 27.1 and 27.7 wt.%, C{sub 4}A{sub 3}$$ respectively, as determined by Rietveld analysis. We also studied the complex hydration process of BSA cements prepared by mixing BSA clinkers and gypsum. We present a methodology to establish the phase assemblage evolution of BSA cement pastes with time, including amorphous phases and free water. The methodology is based on Rietveld quantitative phase analysis of synchrotron and laboratory X-ray powder diffraction data coupled with chemical constraints. A parallel calorimetric study is also reported. It is shown that the beta-C{sub 2}S phase is more reactive in aluminum-rich BSA cements than in standard belite cements. On the other hand, C{sub 4}A{sub 3}$ reacts faster than the belite phases. The gypsum ratio in the cement is also shown to be an important factor in the phase evolution.

• OSTI ID: 21344746
• Journal Information: Cement and Concrete Research, Journal Name: Cement and Concrete Research Journal Issue: 3 Vol. 40; ISSN 0008-8846; ISSN CCNRAI
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ALUMINIUM
AMORPHOUS STATE
BUILDING MATERIALS
CALORIMETRY
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CEMENTS
CHALCOGENIDES
CHEMICAL ANALYSIS
COHERENT SCATTERING
DIFFERENTIAL THERMAL ANALYSIS
DIFFRACTION
ELEMENTS
GRAVIMETRIC ANALYSIS
GYPSUM
HYDRATION
HYDROGEN COMPOUNDS
MATERIALS
METALS
MICROSCOPY
MINERALS
MIXING
OXIDES
OXYGEN COMPOUNDS
PHASE STUDIES
PORTLAND CEMENT
QUANTITATIVE CHEMICAL ANALYSIS
SCATTERING
SOLVATION
SULFATE MINERALS
TEMPERATURE RANGE
TEMPERATURE RANGE 1000-4000 K
THERMAL ANALYSIS
THERMAL GRAVIMETRIC ANALYSIS
WATER
X-RAY DIFFRACTION